Imaging lens system

Abstract

The utility model relates to an imaging lens system. The imaging lens system includes: a first lens group including a first lens and a second lens; a second lens group including a third lens, a fourth lens, and a fifth lens; and a third lens group including a sixth lens, a seventh lens, and an eighth lens, in which the first to third lens groups are sequentially arranged along an optical axis of the imaging lens system from an object side of the imaging lens system toward an imaging plane of the imaging lens system, and the imaging lens system satisfies a conditional expression 2.0 lt; and TTL / 2ImgHTlt, and TL / TTL is the distance from the object side surface of the first lens to the imaging surface along the optical axis, and 2ImgHT is the diagonal length of the imaging surface.

Description

[0001] Cross - reference to related applications

[0002] This application claims the benefit of priority of Korean Patent Application No. 10 - 2024 - 0105343, filed on August 7, 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 configured to improve the resolution of a peripheral portion of an imaging surface. Background art

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

[0005] As the performance of an electronic device in which a camera module is installed increases, there is a need for a camera module having high performance and high resolution while having a small size. For example, in order to implement a high - performance camera module, an imaging lens system having high magnification (zoom) performance is required. However, an imaging lens system having high magnification performance has a problem in that the resolution of a peripheral portion of an imaging surface is significantly lower than the resolution of a central portion around the optical axis of the imaging surface. Summary of the utility model

[0006] The present summary is provided to introduce a selection of concepts in a simplified form, which are further described below in the detailed description. The present summary is not intended to identify 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 a general aspect, an imaging lens system includes: a first lens group including a first lens and a second lens; a second lens group including a third lens, a fourth lens, and a fifth lens; and a third lens group including a sixth lens, a seventh lens, and an eighth lens, wherein the first lens group to the third lens group are arranged in order from the object side of the imaging lens system toward the imaging surface of the imaging lens system along the optical axis of the imaging lens system, and the imaging lens system satisfies the following conditional expression: 2.0 < TTL / 2ImgHT < 3.0, where TTL is the distance from the object side surface of the first lens to the imaging surface along the optical axis, and 2ImgHT is the diagonal length of the imaging surface.

[0008] In general, 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, which 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, where the first lens and the eighth lens each have a negative refractive power, and the imaging lens system satisfies the following conditional expression: 2.0 < TTL / 2ImgHT < 3.0, where TTL is the distance along the optical axis from the object side surface of the first lens to the imaging surface, and 2ImgHT is the diagonal length of the imaging surface.

[0009] Other features and aspects will be apparent from the following detailed description, the drawings, and the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a configuration diagram of an imaging lens system according to a first embodiment of the present disclosure.

[0011] Figure 2 and Figure 3 is Figure 1 the aberration curve of the imaging lens system shown in

[0012] Figure 4 is a configuration diagram of an imaging lens system according to a second embodiment of the present disclosure.

[0013] Figure 5 and Figure 6 is Figure 4 the aberration curve of the imaging lens system shown in

[0014] Figure 7 is a configuration diagram of an imaging lens system according to a third embodiment of the present disclosure.

[0015] Figure 8 and Figure 9 is Figure 7 the aberration curve of the imaging lens system shown in

[0016] Figure 10 is a configuration diagram of an imaging lens system according to a fourth embodiment of the present disclosure.

[0017] Figure 11 and Figure 12 is Figure 10 the aberration curve of the imaging lens system shown in

[0018] Figure 13 is a configuration diagram of an imaging lens system according to a fifth embodiment of the present disclosure.

[0019] Figure 14 and Figure 15 is Figure 13The aberration curves of the imaging lens system are shown.

[0020] Figure 16 This is a configuration diagram of an imaging lens system according to the sixth embodiment of this disclosure.

[0021] Figure 17 and Figure 18 yes Figure 16 The aberration curves of the imaging lens system are shown.

[0022] Figure 19 This is a configuration diagram of an imaging lens system according to the seventh embodiment of this disclosure.

[0023] Figure 20 and Figure 21 yes Figure 19 The aberration curves of the imaging lens system are shown.

[0024] Figure 22 This is a configuration diagram of an imaging lens system according to the eighth embodiment of this disclosure.

[0025] Figure 23 and Figure 24 yes Figure 22 The aberration curves of the imaging lens system are shown.

[0026] Figure 25 This is a configuration diagram of an imaging lens system according to the ninth embodiment of this disclosure.

[0027] Figure 26 and Figure 27 yes Figure 25 The aberration curves of the imaging lens system are shown.

[0028] Figure 28 This is a configuration diagram of an imaging lens system according to the tenth embodiment of this disclosure.

[0029] Figure 29 and Figure 30 yes Figure 28 The aberration curves of the imaging lens system are shown.

[0030] Figure 31 It is an electronic device in which an imaging lens system according to an embodiment of the present disclosure is installed.

[0031] Throughout the accompanying drawings and specific embodiments, the same reference numerals denote the same elements. For clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative dimensions, scale, and descriptions of the elements in the drawings may be exaggerated. Detailed Implementation

[0032] 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 be apparent after 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, but can be changed as will be apparent after understanding the disclosure of this application, except for operations that must occur in a certain order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0033] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided merely to illustrate some of the many possible ways in which the methods, apparatus, and / or systems described herein will be apparent upon understanding the disclosure of this application.

[0034] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on," "connected to," or "attached to" another element, it may be directly "on," directly "connected to," or directly "attached to" the other element, or there may be one or more other elements in between. Conversely, when an element is described as being "directly" "on," "directly connected to," or "directly attached to" another element, there are no other elements in between.

[0035] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more of the associated listed items.

[0036] Although terms such as “first,” “second,” and “third” may be used in this document to describe various components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, the first component, first assembly, first region, first layer, or first part mentioned in the examples described herein may also be referred to as a second component, second assembly, second region, second layer, or second part without departing from the teachings of the examples.

[0037] For ease of description, spatial relative terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. In addition to the orientation depicted in the drawings, these spatial relative terms are intended to also include different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as “above” or “upper” relative to another element will consequently be “below” or “lower” relative to said other element. Therefore, the term “above” includes both upper and lower orientations, depending on the spatial orientation of the device. 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 will be interpreted accordingly.

[0038] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. The terms “a,” “an,” and “the” are intended to include the plural meaning as well, unless the context clearly indicates otherwise. The terms “comprising,” “including,” and “having” specify the presence of the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0039] In the lens configuration diagrams in the accompanying drawings of this application, for ease of explanation, the thickness, size, and shape of the lenses may be slightly exaggerated, and in particular, the spherical or aspherical shapes shown in the lens configuration diagrams are merely illustrative and are not limited to the shapes shown.

[0040] In this specification, the first lens refers to the lens positioned closest to the object (or subject), and the eighth lens refers to the lens positioned closest to the imaging surface (or image sensor).

[0041] In this specification, the units for radius of curvature, thickness, distance from the object side of the first lens to the imaging surface (TTL), distance from the image side of the eighth lens to the imaging surface (BFL), height of the imaging surface (ImgHT), focal length, and gap between lenses are expressed in millimeters (mm). Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 8 , Figure 9 , Figure 11 , Figure 12 , Figure 14 , Figure 15 , Figure 17 , Figure 18 , Figure 20 , Figure 21 , Figure 23 , Figure 24 , Figure 26 , Figure 27 , Figure 29 and Figure 30 lists “IMG HT” instead of “ImgHT”, but the two terms mean the same thing.

[0042] The thickness of the lens, the gap between the lenses, the TTL, and the BFL refer to the distances measured along the optical axis of the lens.

[0043] In addition, in the description of the shape of the lens, the statement that one surface of the lens is convex means that the paraxial region of that surface is convex, and the statement that one surface of the lens is concave means that the paraxial region of that surface is concave. Thus, even when it is stated that one surface of the lens is convex, the edge portion of the lens may be concave. Similarly, even when it is stated that one surface of the lens is concave, the edge portion of the lens may be convex.

[0044] The paraxial region of the lens surface is a very narrow region of the lens surface that is close to the optical axis of the lens surface. More specifically, the paraxial region of the lens surface is a region of the lens surface that surrounds the optical axis of that lens surface and includes the central portion of the optical axis of that lens surface, where the light rays incident on that lens surface form a small angle θ with the optical axis, and the approximations sinθ≈θ, tanθ≈θ, and cosθ≈1 are valid.

[0045] The imaging lens system according to the first aspect of the present disclosure may include a first lens group, a second lens group, and a third lens group, which 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. In the imaging lens system according to the first aspect, the first lens group may include a first lens and a second lens, the second lens group may include a third lens, a fourth lens, and a fifth lens, and the third lens group may include a sixth lens, a seventh lens, and an eighth lens.

[0046] The imaging lens system according to the first aspect may satisfy a specific conditional expression. For example, the imaging lens system according to the first aspect may satisfy the conditional expression 2.0<TTL / 2ImgHT<3.0. In this conditional expression, TTL is the distance along the optical axis from the object side surface of the first lens to the imaging surface, and 2ImgHT is the diagonal length of the imaging surface.

[0047] The imaging lens system according to the second aspect of the present disclosure 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, which 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. The imaging lens system according to the second aspect may include a plurality of lenses having negative refractive power. For example, in the imaging lens system according to the second aspect, the first lens and the eighth lens may each have negative refractive power.

[0048] The imaging lens system according to the second aspect can satisfy a specific conditional expression. For example, the imaging lens system according to the second aspect can satisfy the conditional expression 2.0 < TTL / 2ImgHT < 3.0. In this conditional expression, TTL is the distance along the optical axis from the object side surface of the first lens to the imaging surface, and 2ImgHT is the diagonal length of the imaging surface.

[0049] The imaging lens system according to the third aspect of the present disclosure can include a plurality of lens groups. For example, the imaging lens system according to the third aspect can include a first lens group, a second lens group, and a third lens group, which 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.

[0050] The imaging lens system according to the third aspect can include at least one lens group configured to be drivable in the direction of the optical axis. For example, in the imaging lens system according to the third aspect, the second lens group and the third lens group can be configured to be drivable in the direction of the optical axis.

[0051] The imaging lens system according to the third aspect can include aspherical glass lenses. For example, in the imaging lens system according to the third aspect, the first lens group and the second lens group can each include one or more aspherical glass lenses. In the imaging lens system according to the third aspect, the second lens group and the third lens group can include the same number of lenses. For example, in the imaging lens system according to the third aspect, the second lens group and the third lens group can each include three lenses.

[0052] The imaging lens system according to the third aspect can continuously change the field of view (FOV) and the focal length (f) of the imaging lens system by the following operation: moving the second lens group and the third lens group toward the object side or the imaging surface of the imaging lens system while keeping the distance along the optical axis from the object side surface of the first lens group to the imaging surface constant.

[0053] The imaging lens system according to the fourth aspect of the present disclosure can include a first lens to an 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 can satisfy any one of the following conditional expressions 1 to conditional expression 9 or any combination of any two or more of the following conditional expressions 1 to conditional expression 9.

[0054] -5.0 < fw / f6 < -0.10 (conditional expression 1)

[0055] 0.10 < fw / f7 < 5.0 (conditional expression 2)

[0056] -5.0 < fw / f8 < -0.10 (Conditional Expression 3)

[0057] 1.45 < Nd3 < 1.50 (Conditional Expression 4)

[0058] -5.0 < fw / R10 < -0.10 (Conditional Expression 5)

[0059] -5.0 < fw / R14 < -0.10 (Conditional Expression 6)

[0060] 2.0 < TTL / 2ImgHT < 3.0 (Conditional Expression 7)

[0061] 0.20 < BFLw / 2ImgHT < 0.60 (Conditional Expression 8)

[0062] 1.30 < TTL / fw < 1.70 (Conditional Expression 9)

[0063] In the above conditional expressions, fw is the focal length of the imaging lens system at the wide-angle end (or the first position of the lens group), 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, Nd3 is the refractive index of the third lens, R10 is the radius of curvature of the image side of the fifth lens, R14 is the radius of curvature of the image side of the seventh lens, and BFLw is the distance from the image side of the eighth lens to the imaging surface at the wide-angle end.

[0064] In the above conditional expressions, Conditional Expressions 1 to 3 can be numerical ranges for restricting the optical characteristics of the sixth to eighth lenses to improve the performance of the peripheral portion of the imaging surface. For example, an imaging lens system that satisfies one or more of Conditional Expressions 1 to 3 can improve the resolution of the peripheral portion of the imaging surface to a level substantially equal to that of the central portion around the optical axis of the imaging surface.

[0065] In the above conditional expressions, Conditional Expression 4 can be a numerical range for restricting the optical characteristics of the lens to improve the high-resolution chromatic aberration. For example, the third lens that satisfies Conditional Expression 4 can be advantageous in improving chromatic aberration because it can have low dispersion characteristics.

[0066] In the above conditional expressions, Conditional Expressions 5 and 6 can be numerical ranges for restricting the optical characteristics of the fifth lens and the seventh lens to improve the field curvature aberration. For example, an imaging lens system that satisfies one or both of Conditional Expressions 5 and 6 can effectively improve the field curvature aberration in the peripheral portion of the imaging surface.

[0067] In the above conditional expressions, conditional expressions 7 to 9 may be numerical ranges for realizing miniaturization of an imaging lens system. For example, an imaging lens system that satisfies any one of conditional expressions 7 to 9 or any combination of any two or more of conditional expressions 7 to 9 can be miniaturized to facilitate installation in a portable terminal.

[0068] The imaging lens system according to the fifth aspect of the present disclosure may include a first lens group, a second lens group, and a third lens group, which are 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 the imaging lens system may satisfy any one of the following conditional expressions 10 to 15 or any combination of any two or more of conditional expressions 10 to 15.

[0069] -3.20 < fG1F / fG2F < -1.60 (conditional expression 10)

[0070] 0.20 < fG1F / fG3F < 1.60 (conditional expression 11)

[0071] -1.20 < fG2F / fG3F < -0.20 (conditional expression 12)

[0072] -4.20 < fG1R / fG2R < -2.80 (conditional expression 13)

[0073] -8.0 < fG1R / fG3R < -4.0 (conditional expression 14)

[0074] 1.0 < fG2R / fG3R < 2.40 (conditional expression 15)

[0075] In the above conditional expressions, fG1F is the focal length of the lens closest to the object in the first lens group, fG2F is the focal length of the lens closest to the object in the second lens group, fG3F is the focal length of the lens closest to the object in the third lens group, fG1R is the focal length of the lens closest to the imaging surface in the first lens group, fG2R is the focal length of the lens closest to the imaging surface in the second lens group, and fG3R is the focal length of the lens closest to the imaging surface in the third lens group.

[0076] The above conditional expressions may be numerical ranges for restricting the refractive power distribution of the first lens group to the third lens group. For example, an imaging lens system outside the numerical range of the above conditional expressions may reduce the resolution of the imaging lens system.

[0077] The imaging lens system according to the sixth aspect of the present disclosure may include a first lens group, a second lens group, and a third lens group, which 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, and the imaging lens system may satisfy any one of the following conditional expressions 16 to conditional expression 21 or any combination of any two or more of the conditional expressions 16 to conditional expression 21.

[0078] 1.60 < RG1F / RG2F < 7.20 (conditional expression 16)

[0079] -3.0 < RG1F / RG3F < -0.60 (conditional expression 17)

[0080] -1.0 < RG2F / RG3F < -0.20 (conditional expression 18)

[0081] -1.60 < rG1R / rG2R < -0.80 (conditional expression 19)

[0082] 1.20 < rG1R / rG3R < 2.40 (conditional expression 20)

[0083] -2.0 < rG2R / rG3R < -1.0 (conditional expression 21)

[0084] In the above conditional expressions, RG1F is the radius of curvature of the object side surface of the lens closest to the object in the first lens group, RG2F is the radius of curvature of the object side surface of the lens closest to the object in the second lens group, RG3F is the radius of curvature of the object side surface of the lens closest to the object in the third lens group, rG1R is the radius of curvature of the image side surface of the lens closest to the imaging surface in the first lens group, rG2R is the radius of curvature of the image side surface of the lens closest to the imaging surface in the second lens group, and rG3R is the radius of curvature of the image side surface of the lens closest to the imaging surface in the third lens group.

[0085] The above conditional expressions may be numerical ranges for reducing the aberrations of the first lens group to the third lens group. For example, the lens shapes of the lens groups outside the numerical ranges of the above conditional expressions may have increased aberrations of the imaging lens system.

[0086] The imaging lens system according to the seventh aspect of this disclosure 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, which 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, and the imaging lens system may satisfy any one of the following conditional expressions 22 to 24 or any combination of any two or more of the following conditional expressions 22 to 24.

[0087] 1.0 < (R2 + R3) / R4 < 2.0 (Conditional expression 22)

[0088] 0.20 < (R5 + R6) / R7 < 0.60 (Conditional expression 23)

[0089] 1.0 < (R8 + R9) / R10 < 2.0 (Conditional expression 24)

[0090] In the above conditional expressions, 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, R6 is the radius of curvature of the image-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, R9 is the radius of curvature of the object-side surface of the fifth lens, and R10 is the radius of curvature of the image-side surface of the fifth lens.

[0091] The above conditional expression can be a numerical range used to reduce the aberrations of the first to fifth lenses. For example, the first to fifth lenses, falling outside the numerical range of the above conditional expression, may have increased aberrations in the imaging lens system.

[0092] The imaging lens system according to the eighth aspect of this disclosure may include multiple lens groups. For example, the imaging lens system according to the eighth aspect may include a first lens group, a second lens group, and a third lens group, which 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 according to the eighth aspect may include lens groups configured to be drivable in the direction of the optical axis. For example, in the imaging lens system according to the eighth aspect, the second lens group and the third lens group may be configured to be drivable in the direction of the optical axis. In the imaging lens system according to the eighth aspect, the second lens group and the third lens group may include the same number of lenses. For example, in the imaging lens system according to the eighth aspect, the second lens group and the third lens group may each include three lenses.

[0093] The imaging lens system according to the eighth aspect can be configured to enable continuous adjustment of the focusing magnification (zooming in and out). For example, in the imaging lens system according to the eighth aspect, the first lens group and the third lens group can each have a negative refractive power, and the second lens group can have a positive refractive power. As another example, in the imaging lens system according to the eighth aspect, the focal length (fG1) of the first lens group, the focal length (fG2) of the second lens group, and the focal length (fG3) of the third lens group can satisfy the following conditional expressions 25 and conditional expression 26.

[0094] |1 / fG1| < |1 / fG3| (conditional expression 25)

[0095] |1 / fG3| < |1 / fG2| (conditional expression 26)

[0096] As another example, the imaging lens system according to the eighth aspect can satisfy any one or any combination of any two or more of the following conditional expressions 27 to conditional expression 30.

[0097] -4.60 < fG1 / fG2 < -2.60 (conditional expression 27)

[0098] -1.80 < fG3 / fG2 < -0.80 (conditional expression 28)

[0099] 1.60 < fG1 / fG3 < 4.0 (conditional expression 29)

[0100] 1.0 < (fG1 + fG2) / fG3 < 3.0 (conditional expression 30)

[0101] The imaging lens system according to the ninth aspect of the present disclosure can be configured to include any two or more of the features according to the first aspect to the eighth aspect. For example, the imaging lens system according to the ninth aspect can include the features of the first aspect and satisfy any one or any combination of any two or more of the conditional expressions according to the fourth aspect to the seventh aspect. As another example, the imaging lens system according to the ninth aspect can include the features of the eighth aspect while satisfying any one or any combination of any two or more of the conditional expressions according to the fourth aspect to the seventh aspect.

[0102] Imaging lens systems according to the first to ninth aspects may, as needed, include one or more lenses having the following characteristics. For example, an imaging lens system according to the first aspect may include one of the first to eighth lenses having the following characteristics. As another example, an imaging lens system according to the second aspect may include two or more of the first to eighth lenses having the following characteristics. However, an imaging lens system according to the above aspects may not necessarily include lenses having the following characteristics. The characteristics of the first to eighth lenses are described below.

[0103] The first lens may have refractive power. For example, the first lens may have negative refractive power. The first lens may have a convex shape on one surface. For example, the first lens may have a convex object-side surface. The first lens may have an aspherical shape. For example, both surfaces of the first lens may be aspherical. 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. The first lens may have a predetermined refractive index. For example, the first lens may have a refractive index of 1.76 or greater. The first lens may have a predetermined Abbe number. For example, the first lens may have an Abbe number of 40 or greater.

[0104] The second lens may have refractive power. For example, the second lens may have positive refractive power. The second lens may have a convex shape on one surface. For example, the second lens may have a convex object-side surface. 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 predetermined refractive index. For example, the second lens may have a refractive index of 1.65 or greater.

[0105] The third lens may have refractive power. For example, the third lens may have positive refractive power. The third lens may have a convex shape on one surface. For example, the third lens may have a convex object-side surface. The third lens may have an aspherical shape. For example, both surfaces of the third lens may be aspherical. The third lens may be made of a material with high light transmittance and excellent processability. For example, the third lens may be made of glass or plastic. The third lens may have a predetermined refractive index. For example, the third lens may have a refractive index less than 1.6. The third lens may have a predetermined Abbe number. For example, the third lens may have an Abbe number of 80 or greater.

[0106] The fourth lens may have refractive power. For example, the fourth lens may have positive refractive power. The fourth lens may have a concave shape on one surface. For example, the fourth lens may have a concave object-side surface. The fourth lens may have an aspherical shape. For example, both surfaces of the fourth lens may be aspherical. The fourth lens may be made of a material with high light transmittance and excellent processability. For example, the fourth lens may be made of glass or plastic. The fourth lens may have a predetermined refractive index. For example, the fourth lens may have a refractive index of 1.5 or greater. The fourth lens may have a predetermined Abbe number. For example, the fourth lens may have an Abbe number of 50 or greater.

[0107] The fifth lens can have refractive power. For example, the fifth lens can have negative refractive power. The fifth lens can have a concave shape on one surface. For example, the fifth lens can have a concave object-side surface. 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. The fifth lens can have a predetermined refractive index. For example, the fifth lens can have a refractive index of 1.8 or greater. The fifth lens can have a predetermined Abbe number. For example, the fifth lens can have an Abbe number of 20 or greater.

[0108] The sixth lens may have refractive power. For example, the sixth lens may have negative refractive power. The sixth lens may have a concave shape on one surface. For example, the sixth lens may have a concave object-side surface. The sixth lens may have an aspherical shape. For example, both surfaces of the sixth lens may be aspherical. The sixth lens may be made of a material with high light transmittance and excellent processability. For example, the sixth lens may be made of glass or plastic. The sixth lens may have a predetermined refractive index. For example, the sixth lens may have a refractive index of 1.6 or greater. The sixth lens may have a predetermined Abbe number. For example, the sixth lens may have an Abbe number of 20 or greater.

[0109] The seventh lens can have refractive power. For example, the seventh lens can have positive refractive power. The seventh lens can have a convex shape on one surface. For example, the seventh lens can have a convex image-side surface. The seventh lens can have an aspherical shape. For example, both surfaces of the seventh lens can be aspherical. The seventh lens can be made of a material with high light transmittance and excellent processability. For example, the seventh lens can be made of glass or plastic. The seventh lens can have a predetermined refractive index. For example, the seventh lens can have a refractive index of 1.6 or greater. The seventh lens can have a predetermined Abbe number. For example, the seventh lens can have an Abbe number of 15 or greater.

[0110] The eighth lens may have refractive power. For example, the eighth lens may have negative refractive power. The eighth lens may have a concave shape on one surface. For example, the eighth lens may have a concave object-side surface. The eighth lens may have an aspherical shape. For example, both surfaces of the eighth lens may be aspherical. The eighth lens may have a shape including inflection points. For example, inflection points may be formed on one or both of the object-side and image-side surfaces of the eighth lens. The eighth lens may be made of a material with high light transmittance and excellent processability. For example, the eighth lens may be made of glass or plastic. The eighth lens may have a predetermined refractive index. For example, the eighth lens may have a refractive index of 1.5 or greater. The eighth lens may have a predetermined Abbe number. For example, the eighth lens may have an Abbe number of 50 or greater.

[0111] The aspherical lens that constitutes an imaging lens system can be represented by the following equation 1:

[0112]

[0113] 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 of the lens surface; k is the conic constant; and r is the distance from any point on the aspherical surface of the lens to the optical axis. Furthermore, constants A through H and J are aspherical surface coefficients. Z (also called sag) is the distance in a direction parallel to the optical axis between a point on the aspherical surface of the lens at a distance r from the optical axis and a tangent plane perpendicular to the optical axis and intersecting the vertex of the aspherical surface.

[0114] An imaging lens system may include an optical path conversion device, an aperture, an imaging surface, and a filter.

[0115] The optical path conversion device can be disposed on one side of the lens. For example, the optical path conversion device can be disposed on the object side of the first lens. The optical path conversion device can be configured to include one or more reflective surfaces. For example, the optical path conversion device can be configured as a prism. An aperture can be disposed between the two lenses. An imaging surface can be formed at the point where the light refracted from the first lens to the eighth lens converges. The imaging surface can be formed by an image sensor. For example, the imaging surface can be formed on the surface of the image sensor or on the inner layer of the image sensor. A filter can be disposed between the eighth lens and the imaging surface. The filter can block light of certain wavelengths. For example, the filter can block infrared wavelengths of light.

[0116] Figure 1 This is a configuration diagram of an imaging lens system according to a first embodiment of the present disclosure.

[0117] Reference Figure 1 The imaging lens system 100 may include multiple lens groups.

[0118] For example, the imaging lens system 100 may include a first lens group LG1, a second lens group LG2, and a third lens group LG3, which are arranged sequentially along the optical axis of the imaging lens system 100 from the object side of the imaging lens system 100 toward the imaging plane IP of the imaging lens system 100. Each lens group of lens groups LG1, LG2, and LG3 may include multiple lenses. For example, the first lens group LG1 may include a first lens 110 and a second lens 120, the second lens group LG2 may include a third lens 130, a fourth lens 140, and a fifth lens 150, and the third lens group LG3 may include a sixth lens 160, a seventh lens 170, and an eighth lens 180. However, the lenses constituting the first lens groups LG1 to the third lens groups LG3 are not limited to the above configuration.

[0119] The imaging lens system 100 can be configured to achieve focus magnification adjustment (magnification and reduction) and focus adjustment (AF). For example, the second lens group LG2 and the third lens group LG3 can be configured to be driven in the optical axis direction. Furthermore, the second lens group LG2 can be driven to achieve focus magnification adjustment of the imaging lens system 100, and the third lens group LG3 can be driven to achieve focus adjustment of the imaging lens system 100.

[0120] The imaging lens system 100 may also include an optical path conversion device P. The optical path conversion device P may be configured as a prism and may be disposed on the object side of the first lens group LG1.

[0121] The optical characteristics of the lenses that constitute the first lens group LG1 to the third lens group LG3 are described below.

[0122] The first lens 110 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. The second lens 120 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The third lens 130 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The fourth lens 140 can have positive refractive power and can have a concave object-side surface and a convex image-side surface. The fifth lens 150 can have negative refractive power and can have a concave object-side surface and a convex image-side surface. The sixth lens 160 can have negative refractive power and can have a concave object-side surface and a concave image-side surface. The seventh lens 170 can have positive refractive power and can have a concave object-side surface and a convex image-side surface. The eighth lens 180 can have negative refractive power and can have a concave object-side surface and a concave image-side surface.

[0123] 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.

[0124] Figure 2 and Figure 3 Aberration curves of the imaging lens system according to the first embodiment are shown.

[0125] Tables 1 and 2 below show the lens characteristic values ​​and aspherical values ​​of the imaging lens system 100 according to the first embodiment.

[0126] Table 1

[0127]

[0128] Table 2

[0129]

[0130]

[0131] Figure 4 This is a configuration diagram of an imaging lens system according to a second embodiment of the present disclosure.

[0132] Reference Figure 4 The imaging lens system 200 may include multiple lens groups. For example, the imaging lens system 200 may include a first lens group LG1, a second lens group LG2, and a third lens group LG3, which are arranged sequentially along the optical axis of the imaging lens system 200 from the object side of the imaging lens system 200 toward the imaging plane IP of the imaging lens system 200. Each lens group of lens groups LG1, LG2, and LG3 may include multiple lenses. For example, the first lens group LG1 may include a first lens 210 and a second lens 220, the second lens group LG2 may include a third lens 230, a fourth lens 240, and a fifth lens 250, and the third lens group LG3 may include a sixth lens 260, a seventh lens 270, and an eighth lens 280. However, the lenses constituting the first lens groups LG1 to the third lens groups LG3 are not limited to the above configuration.

[0133] The imaging lens system 200 can be configured to achieve focus magnification adjustment (zoom) and focus adjustment (AF). For example, the second lens group LG2 and the third lens group LG3 can be configured to be driven in the optical axis direction. Furthermore, the second lens group LG2 can be driven to achieve focus magnification adjustment of the imaging lens system 200, and the third lens group LG3 can be driven to achieve focus adjustment of the imaging lens system 200.

[0134] The imaging lens system 200 may also include an optical path conversion device P. The optical path conversion device P may be configured as a prism and may be disposed on the object side of the first lens group LG1.

[0135] The optical characteristics of the lenses that constitute the first lens group LG1 to the third lens group LG3 are described below.

[0136] The first lens 210 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. The second lens 220 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The third lens 230 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The fourth lens 240 can have positive refractive power and can have a concave object-side surface and a convex image-side surface. The fifth lens 250 can have negative refractive power and can have a concave object-side surface and a convex image-side surface. The sixth lens 260 can have negative refractive power and can have a concave object-side surface and a concave image-side surface. The seventh lens 270 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The eighth lens 280 can have negative refractive power and can have a convex object-side surface and a concave image-side surface.

[0137] 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.

[0138] Figure 5 and Figure 6 Aberration curves of the imaging lens system according to the second embodiment are shown.

[0139] Tables 3 and 4 below show the lens characteristic values ​​and aspherical values ​​of the imaging lens system 200 according to the second embodiment.

[0140] Table 3

[0141]

[0142] Table 4

[0143]

[0144]

[0145] Figure 7 This is a configuration diagram of an imaging lens system according to a third embodiment of the present disclosure.

[0146] Reference Figure 7The imaging lens system 300 may include multiple lens groups. For example, the imaging lens system 300 may include a first lens group LG1, a second lens group LG2, and a third lens group LG3, which are arranged sequentially along the optical axis of the imaging lens system 300 from the object side of the imaging lens system 300 toward the imaging plane IP of the imaging lens system 300. Each of the lens groups LG1, LG2, and LG3 may include multiple lenses. For example, the first lens group LG1 may include a first lens 310 and a second lens 320, the second lens group LG2 may include a third lens 330, a fourth lens 340, and a fifth lens 350, and the third lens group LG3 may include a sixth lens 360, a seventh lens 370, and an eighth lens 380. However, the lenses constituting the first lens groups LG1 to the third lens groups LG3 are not limited to the above configuration.

[0147] The imaging lens system 300 can be configured to achieve focus magnification adjustment (zoom) and focus adjustment (AF). For example, the second lens group LG2 and the third lens group LG3 can be configured to be driven in the optical axis direction. Furthermore, the second lens group LG2 can be driven to achieve focus magnification adjustment of the imaging lens system 300, and the third lens group LG3 can be driven to achieve focus adjustment of the imaging lens system 300.

[0148] The imaging lens system 300 may also include an optical path conversion device P. The optical path conversion device P may be configured as a prism and may be disposed on the object side of the first lens group LG1.

[0149] The optical characteristics of the lenses that constitute the first lens group LG1 to the third lens group LG3 are described below.

[0150] The first lens 310 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. The second lens 320 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The third lens 330 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The fourth lens 340 can have positive refractive power and can have a concave object-side surface and a convex image-side surface. The fifth lens 350 can have negative refractive power and can have a concave object-side surface and a convex image-side surface. The sixth lens 360 can have negative refractive power and can have a concave object-side surface and a concave image-side surface. The seventh lens 370 can have positive refractive power and can have a concave object-side surface and a convex image-side surface. The eighth lens 380 can have negative refractive power and can have a concave object-side surface and a concave image-side surface.

[0151] 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.

[0152] Figure 8 and Figure 9 Aberration curves of the imaging lens system according to the third embodiment are shown.

[0153] Tables 5 and 6 below show the lens characteristic values ​​and aspherical values ​​of the imaging lens system 300 according to the third embodiment.

[0154] Table 5

[0155]

[0156] Table 6

[0157]

[0158]

[0159] Figure 10 This is a configuration diagram of an imaging lens system according to the fourth embodiment of this disclosure.

[0160] Reference Figure 10 The imaging lens system 400 may include multiple lens groups. For example, the imaging lens system 400 may include a first lens group LG1, a second lens group LG2, and a third lens group LG3, which are arranged sequentially along the optical axis of the imaging lens system 400 from the object side of the imaging lens system 400 toward the imaging plane IP of the imaging lens system 400. Each of the lens groups LG1, LG2, and LG3 may include multiple lenses. For example, the first lens group LG1 may include a first lens 410 and a second lens 420, the second lens group LG2 may include a third lens 430, a fourth lens 440, and a fifth lens 450, and the third lens group LG3 may include a sixth lens 460, a seventh lens 470, and an eighth lens 480. However, the lenses constituting the first lens groups LG1 to the third lens groups LG3 are not limited to the above configuration.

[0161] The imaging lens system 400 can be configured to achieve focus magnification adjustment (zoom) and focus adjustment (AF). For example, the second lens group LG2 and the third lens group LG3 can be configured to be driven in the optical axis direction. Furthermore, the second lens group LG2 can be driven to achieve focus magnification adjustment of the imaging lens system 400, and the third lens group LG3 can be driven to achieve focus adjustment of the imaging lens system 400.

[0162] The imaging lens system 400 may also include an optical path conversion device P. The optical path conversion device P may be configured as a prism and may be disposed on the object side of the first lens group LG1.

[0163] The optical characteristics of the lenses that constitute the first lens group LG1 to the third lens group LG3 are described below.

[0164] The first lens 410 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. The second lens 420 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The third lens 430 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The fourth lens 440 can have positive refractive power and can have a concave object-side surface and a convex image-side surface. The fifth lens 450 can have negative refractive power and can have a concave object-side surface and a convex image-side surface. The sixth lens 460 can have negative refractive power and can have a concave object-side surface and a concave image-side surface. The seventh lens 470 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The eighth lens 480 can have negative refractive power and can have a concave object-side surface and a concave image-side surface.

[0165] 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.

[0166] Figure 11 and Figure 12 Aberration curves of an imaging lens system according to a fourth embodiment are shown.

[0167] Tables 7 and 8 below show the lens characteristic values ​​and aspherical values ​​of the imaging lens system 400 according to the fourth embodiment.

[0168] Table 7

[0169]

[0170]

[0171] Table 8

[0172]

[0173]

[0174] Figure 13 This is a configuration diagram of an imaging lens system according to the fifth embodiment of this disclosure.

[0175] Reference Figure 13The imaging lens system 500 may include multiple lens groups. For example, the imaging lens system 500 may include a first lens group LG1, a second lens group LG2, and a third lens group LG3, which are arranged sequentially along the optical axis of the imaging lens system 500 from the object side of the imaging lens system 500 toward the imaging surface IP of the imaging lens system 500. Each lens group of lens groups LG1, LG2, and LG3 may include multiple lenses. For example, the first lens group LG1 may include a first lens 510 and a second lens 520, the second lens group LG2 may include a third lens 530, a fourth lens 540, and a fifth lens 550, and the third lens group LG3 may include a sixth lens 560, a seventh lens 570, and an eighth lens 580. However, the lenses constituting the first lens groups LG1 to the third lens groups LG3 are not limited to the above configuration.

[0176] The imaging lens system 500 can be configured to achieve focus magnification adjustment (zoom) and focus adjustment (AF). For example, the second lens group LG2 and the third lens group LG3 can be configured to be driven in the optical axis direction. Furthermore, the second lens group LG2 can be driven to achieve focus magnification adjustment of the imaging lens system 500, and the third lens group LG3 can be driven to achieve focus adjustment of the imaging lens system 500.

[0177] The imaging lens system 500 may also include an optical path conversion device P. The optical path conversion device P may be configured as a prism and may be disposed on the object side of the first lens group LG1.

[0178] The optical characteristics of the lenses that constitute the first lens group LG1 to the third lens group LG3 are described below.

[0179] The first lens 510 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. The second lens 520 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The third lens 530 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The fourth lens 540 can have positive refractive power and can have a concave object-side surface and a convex image-side surface. The fifth lens 550 can have negative refractive power and can have a concave object-side surface and a convex image-side surface. The sixth lens 560 can have negative refractive power and can have a concave object-side surface and a convex image-side surface. The seventh lens 570 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The eighth lens 580 can have negative refractive power and can have a concave object-side surface and a concave image-side surface.

[0180] 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.

[0181] The following Figure 14 and Figure 15 Aberration curves of the imaging lens system according to the fifth embodiment are shown.

[0182] Tables 9 and 10 below show the lens characteristic values ​​and aspherical values ​​of the imaging lens system 500 according to the fifth embodiment.

[0183] Table 9

[0184]

[0185]

[0186] Table 10

[0187]

[0188]

[0189] Figure 16 This is a configuration diagram of an imaging lens system according to the sixth embodiment of this disclosure.

[0190] Reference Figure 16 The imaging lens system 600 may include multiple lens groups. For example, the imaging lens system 600 may include a first lens group LG1, a second lens group LG2, and a third lens group LG3, which are arranged sequentially along the optical axis of the imaging lens system 600 from the object side of the imaging lens system 600 toward the imaging plane IP of the imaging lens system 600. Each lens group of lens groups LG1, LG2, and LG3 may include multiple lenses. For example, the first lens group LG1 may include a first lens 610 and a second lens 620, the second lens group LG2 may include a third lens 630, a fourth lens 640, and a fifth lens 650, and the third lens group LG3 may include a sixth lens 660, a seventh lens 670, and an eighth lens 680. However, the lenses constituting the first lens groups LG1 to the third lens groups LG3 are not limited to the above configuration.

[0191] The imaging lens system 600 can be configured to achieve focus magnification adjustment (zoom) and focus adjustment (AF). For example, the second lens group LG2 and the third lens group LG3 can be configured to be driven in the optical axis direction. Furthermore, the second lens group LG2 can be driven to achieve focus magnification adjustment of the imaging lens system 600, and the third lens group LG3 can be driven to achieve focus adjustment of the imaging lens system 600.

[0192] The imaging lens system 600 may also include an optical path conversion device P. The optical path conversion device P may be configured as a prism and may be disposed on the object side of the first lens group LG1.

[0193] The optical characteristics of the lenses that constitute the first lens group LG1 to the third lens group LG3 are described below.

[0194] The first lens 610 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. The second lens 620 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The third lens 630 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The fourth lens 640 can have positive refractive power and can have a concave object-side surface and a convex image-side surface. The fifth lens 650 can have negative refractive power and can have a concave object-side surface and a convex image-side surface. The sixth lens 660 can have negative refractive power and can have a concave object-side surface and a convex image-side surface. The seventh lens 670 can have positive refractive power and can have a concave object-side surface and a convex image-side surface. The eighth lens 680 can have negative refractive power and can have a concave object-side surface and a concave image-side surface.

[0195] 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.

[0196] Figure 17 and Figure 18 Aberration curves of the imaging lens system according to the sixth embodiment are shown.

[0197] Tables 11 and 12 below show the lens characteristic values ​​and aspherical values ​​of the imaging lens system 600 according to the sixth embodiment.

[0198] Table 11

[0199]

[0200]

[0201] Table 12

[0202]

[0203]

[0204] Figure 19 This is a configuration diagram of an imaging lens system according to the seventh embodiment of this disclosure.

[0205] Reference Figure 19 The imaging lens system 700 may include multiple lens groups. For example, the imaging lens system 700 may include a first lens group LG1, a second lens group LG2, and a third lens group LG3, which are arranged sequentially along the optical axis of the imaging lens system 700 from the object side of the imaging lens system 700 toward the imaging surface IP of the imaging lens system 700. Each lens group LG1, LG2, and LG3 may include multiple lenses. For example, the first lens group LG1 may include a first lens 710 and a second lens 720, the second lens group LG2 may include a third lens 730, a fourth lens 740, and a fifth lens 750, and the third lens group LG3 may include a sixth lens 760, a seventh lens 770, and an eighth lens 780. However, the lenses constituting the first lens group LG1 to the third lens group LG3 are not limited to the above configuration.

[0206] The imaging lens system 700 can be configured to achieve focus magnification adjustment (zoom) and focus adjustment (AF). For example, the second lens group LG2 and the third lens group LG3 can be configured to be driven in the optical axis direction. Furthermore, the second lens group LG2 can be driven to achieve focus magnification adjustment of the imaging lens system 700, and the third lens group LG3 can be driven to achieve focus adjustment of the imaging lens system 700.

[0207] The imaging lens system 700 may also include an optical path conversion device P. The optical path conversion device P may be configured as a prism and may be disposed on the object side of the first lens group LG1.

[0208] The optical characteristics of the lenses that constitute the first lens group LG1 to the third lens group LG3 are described below.

[0209] The first lens 710 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. The second lens 720 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The third lens 730 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The fourth lens 740 can have positive refractive power and can have a concave object-side surface and a convex image-side surface. The fifth lens 750 can have negative refractive power and can have a concave object-side surface and a convex image-side surface. The sixth lens 760 can have negative refractive power and can have a concave object-side surface and a convex image-side surface. The seventh lens 770 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The eighth lens 780 can have negative refractive power and can have a concave object-side surface and a concave image-side surface.

[0210] 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.

[0211] Figure 20 and Figure 21 Aberration curves of the imaging lens system according to the seventh embodiment are shown.

[0212] Tables 13 and 14 below show the lens characteristic values ​​and aspherical values ​​of the imaging lens system 700 according to the seventh embodiment.

[0213] Table 13

[0214]

[0215]

[0216] Table 14

[0217]

[0218]

[0219] Figure 22 This is a configuration diagram of an imaging lens system according to the eighth embodiment of this disclosure.

[0220] Reference Figure 22 The imaging lens system 800 may include multiple lens groups. For example, the imaging lens system 800 may include a first lens group LG1, a second lens group LG2, and a third lens group LG3, which are arranged sequentially along the optical axis of the imaging lens system 800 from the object side of the imaging lens system 800 toward the imaging surface IP of the imaging lens system 800. Each lens group of lens groups LG1, LG2, and LG3 may include multiple lenses. For example, the first lens group LG1 may include a first lens 810 and a second lens 820, the second lens group LG2 may include a third lens 830, a fourth lens 840, and a fifth lens 850, and the third lens group LG3 may include a sixth lens 860, a seventh lens 870, and an eighth lens 880. However, the lenses constituting the first lens groups LG1 to the third lens groups LG3 are not limited to the above configuration.

[0221] The imaging lens system 800 can be configured to achieve focus magnification adjustment (zoom) and focus adjustment (AF). For example, the second lens group LG2 and the third lens group LG3 can be configured to be driven in the optical axis direction. Furthermore, the second lens group LG2 can be driven to achieve focus magnification adjustment of the imaging lens system 800, and the third lens group LG3 can be driven to achieve focus adjustment of the imaging lens system 800.

[0222] The imaging lens system 800 may also include an optical path conversion device P. The optical path conversion device P may be configured as a prism and may be disposed on the object side of the first lens group LG1.

[0223] The optical characteristics of the lenses that constitute the first lens group LG1 to the third lens group LG3 are described below.

[0224] The first lens 810 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. The second lens 820 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The third lens 830 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The fourth lens 840 can have positive refractive power and can have a concave object-side surface and a convex image-side surface. The fifth lens 850 can have negative refractive power and can have a concave object-side surface and a convex image-side surface. The sixth lens 860 can have negative refractive power and can have a concave object-side surface and a concave image-side surface. The seventh lens 870 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The eighth lens 880 can have negative refractive power and can have a concave object-side surface and a concave image-side surface.

[0225] 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.

[0226] Figure 23 and Figure 24 Aberration curves of the imaging lens system according to the eighth embodiment are shown.

[0227] Tables 15 and 16 below show the lens characteristic values ​​and aspherical values ​​of the imaging lens system 800 according to the eighth embodiment.

[0228] Table 15

[0229]

[0230]

[0231] Table 16

[0232]

[0233] Figure 25 This is a configuration diagram of an imaging lens system according to the ninth embodiment of this disclosure.

[0234] Reference Figure 25The imaging lens system 900 may include multiple lens groups. For example, the imaging lens system 900 may include a first lens group LG1, a second lens group LG2, and a third lens group LG3, which are arranged sequentially along the optical axis of the imaging lens system 900 from the object side of the imaging lens system 900 toward the imaging plane IP of the imaging lens system 900. Each lens group of lens groups LG1, LG2, and LG3 may include multiple lenses. For example, the first lens group LG1 may include a first lens 910 and a second lens 920, the second lens group LG2 may include a third lens 930, a fourth lens 940, and a fifth lens 950, and the third lens group LG3 may include a sixth lens 960, a seventh lens 970, and an eighth lens 980. However, the lenses constituting the first lens groups LG1 to the third lens groups LG3 are not limited to the above configuration.

[0235] The imaging lens system 900 can be configured to achieve focus magnification adjustment (zoom) and focus adjustment (AF). For example, the second lens group LG2 and the third lens group LG3 can be configured to be driven in the optical axis direction. Furthermore, the second lens group LG2 can be driven to achieve focus magnification adjustment of the imaging lens system 900, and the third lens group LG3 can be driven to achieve focus adjustment of the imaging lens system 900.

[0236] The imaging lens system 900 may also include an optical path conversion device P. The optical path conversion device P may be configured as a prism and may be disposed on the object side of the first lens group LG1.

[0237] The optical characteristics of the lenses that constitute the first lens group LG1 to the third lens group LG3 are described below.

[0238] The first lens 910 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. The second lens 920 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The third lens 930 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The fourth lens 940 can have positive refractive power and can have a concave object-side surface and a convex image-side surface. The fifth lens 950 can have negative refractive power and can have a concave object-side surface and a convex image-side surface. The sixth lens 960 can have negative refractive power and can have a concave object-side surface and a convex image-side surface. The seventh lens 970 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The eighth lens 980 can have negative refractive power and can have a concave object-side surface and a concave image-side surface.

[0239] 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.

[0240] Figure 26 and Figure 27 Aberration curves of the imaging lens system according to the ninth embodiment are shown.

[0241] Tables 17 and 18 below show the lens characteristic values ​​and aspherical values ​​of the imaging lens system 900 according to the ninth embodiment.

[0242] Table 17

[0243]

[0244] Table 18

[0245]

[0246] Figure 28 This is a configuration diagram of an imaging lens system according to the tenth embodiment of this disclosure. (Refer to...) Figure 28 The imaging lens system 1000 may include multiple lens groups. For example, the imaging lens system 1000 may include a first lens group LG1, a second lens group LG2, and a third lens group LG3, which are arranged sequentially along the optical axis of the imaging lens system 1000 from the object side of the imaging lens system 1000 toward the imaging plane IP of the imaging lens system 1000. Each lens group of lens groups LG1, LG2, and LG3 may include multiple lenses. For example, the first lens group LG1 may include a first lens 1010 and a second lens 1020, the second lens group LG2 may include a third lens 1030, a fourth lens 1040, and a fifth lens 1050, and the third lens group LG3 may include a sixth lens 1060, a seventh lens 1070, and an eighth lens 1080. However, the lenses constituting the first lens groups LG1 to the third lens groups LG3 are not limited to the above configuration.

[0247] The imaging lens system 1000 can be configured to achieve focus magnification adjustment (zoom) and focus adjustment (AF). For example, the second lens group LG2 and the third lens group LG3 can be configured to be driven in the optical axis direction. Furthermore, the second lens group LG2 can be driven to achieve focus magnification adjustment of the imaging lens system 1000, and the third lens group LG3 can be driven to achieve focus adjustment of the imaging lens system 1000.

[0248] The imaging lens system 1000 may also include an optical path conversion device P. The optical path conversion device P may be configured as a prism and may be disposed on the object side of the first lens group LG1.

[0249] The optical characteristics of the lenses that constitute the first lens group LG1 to the third lens group LG3 are described below.

[0250] The first lens 1010 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. The second lens 1020 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The third lens 1030 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The fourth lens 1040 can have positive refractive power and can have a concave object-side surface and a convex image-side surface. The fifth lens 1050 can have negative refractive power and can have a concave object-side surface and a convex image-side surface. The sixth lens 1060 can have negative refractive power and can have a concave object-side surface and a convex image-side surface. The seventh lens 1070 can have positive refractive power and can have a concave object-side surface and a convex image-side surface. The eighth lens 1080 can have negative refractive power and can have a concave object-side surface and a concave image-side surface.

[0251] 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.

[0252] Figure 29 and Figure 30 Aberration curves of the imaging lens system according to the tenth embodiment are shown.

[0253] Tables 19 and 20 below show the lens characteristic values ​​and aspherical values ​​of the imaging lens system 1000 according to the tenth embodiment.

[0254] Table 19

[0255]

[0256] Table 20

[0257]

[0258]

[0259] Tables 21 to 26 show the optical characteristic values ​​and conditional expression values ​​of the imaging lens systems according to the first to tenth embodiments. In Table 21 below, fw is the focal length of the imaging lens system in wide-angle mode, ft is the focal length of the imaging lens system in telephoto mode, the F-number in the next row after fw is the F-number of the imaging lens system in wide-angle mode, the F-number in the next row after ft is the F-number of the imaging lens system in telephoto mode, and f1 to f8 are the focal lengths of the first to eighth lenses, respectively.

[0260] Table 21

[0261]

[0262]

[0263] Table 22

[0264]

[0265] Table 23

[0266]

[0267]

[0268] Table 24

[0269]

[0270] Table 25

[0271]

[0272] Table 26

[0273]

[0274] The imaging lens system according to this embodiment can have specific numerical ranges for the focal lengths of the first to eighth lenses. For example, the focal length of the first lens can be determined in the range of -36.0 mm to -20.0 mm, the focal length of the second lens can be determined in the range of 50 mm to 90 mm, the focal length of the third lens can be determined in the range of 8.0 mm to 16.0 mm, the focal length of the fourth lens can be determined in the range of 12.0 mm to 24.0 mm, the focal length of the fifth lens can be determined in the range of -30.0 mm to -12.0 mm, the focal length of the sixth lens can be determined in the range of -60 mm to -12.0 mm, the focal length of the seventh lens can be determined in the range of 16.0 mm to 36.0 mm, and the focal length of the eighth lens can be determined in the range of -20.0 mm to -8.0 mm.

[0275] Figure 31 This is a diagram of an electronic device in which an imaging lens system according to an embodiment of the present disclosure is installed.

[0276] Reference Figure 31 The electronic device 10 according to embodiments of the present disclosure may include a camera module. For example, the electronic device 10 may be a portable terminal including camera modules 20 and 30. However, the form of the electronic device 10 is not limited to a portable terminal. For example, the electronic device 10 may be any portable electronic device, such as a laptop computer, a tablet PC, or any other portable electronic device. One or both of the camera modules 20 and 30 may be any of the imaging lens systems 100, 200, 300, 400, 500, 600, 700, 800, 900, and 1000 according to the first to tenth embodiments.

[0277] This disclosure provides an imaging lens system capable of improving the resolution in the peripheral portion of the imaging surface.

[0278] While this disclosure includes specific examples, it will be apparent upon understanding the disclosure of this application that various changes in form and detail may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The description of features or aspects in each example is considered applicable to similar features or aspects in other examples. Suitable results may also be obtained if the described techniques are performed in a different order, and / or if components in the described 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 shall be construed as included in this disclosure.

Claims

1. An imaging lens system characterized by comprising, in order from the object side: comprises a first lens and a second lens; comprises a third lens, a fourth lens, and a fifth lens; and a third lens group comprising a sixth lens, a seventh lens, and an eighth lens, wherein the first lens group to the third lens group are arranged in order from an object side of the imaging lens system toward an image plane of the imaging lens system along an optical axis of the imaging lens system, and the imaging lens system satisfies the following conditional expression: 2.0 < TTL / 2ImgHT < 3.0 wherein TTL is a distance from an object side surface of the first lens to the image plane along the optical axis, and 2ImgHT is a diagonal length of the image plane. The object side surface of the first lens is convex in a paraxial region thereof.

2. The imaging lens system of claim 1, wherein, The second lens has a convex object side surface in a paraxial region thereof.

3. The imaging lens system of claim 1, wherein, The third lens has a convex object side surface in a paraxial region thereof.

4. The imaging lens system of claim 1, wherein, The fourth lens has a concave object side surface in a paraxial region thereof.

5. The imaging lens system of claim 1, wherein, The fifth lens has a concave object side surface in a paraxial region thereof.

6. The imaging lens system of claim 1, wherein, The sixth lens has a concave object side surface in a paraxial region thereof.

7. The imaging lens system of claim 1, wherein, The eighth lens has a concave object side surface in a paraxial region thereof.

8. The imaging lens system of claim 1, wherein, comprises 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 in order from an object side of the imaging lens system toward an image plane of the imaging lens system along an optical axis of the imaging lens system, 9. An imaging lens system characterized by comprising, in order from the object, wherein the first lens and the eighth lens each have a negative refractive power, and the imaging lens system satisfies the following conditional expression: 2.0 < TTL / 2ImgHT < 3.0 wherein TTL is a distance from an object side surface of the first lens to the image plane along the optical axis, and 2ImgHT is a diagonal length of the image plane. The object side surface of the first lens is convex in a paraxial region thereof. The second lens has a convex object side surface in a paraxial region thereof.

10. The imaging lens system of claim 9, wherein, The third lens has a convex object side surface in a paraxial region thereof.

11. The imaging lens system of claim 9, wherein, The fourth lens has a concave object side surface in a paraxial region thereof.

12. The imaging lens system of claim 9, wherein, The fifth lens has a concave object side surface in a paraxial region thereof.

13. The imaging lens system of claim 9, wherein, The sixth lens has a concave object side surface in a paraxial region thereof.

14. The imaging lens system of claim 9, wherein, The eighth lens has a concave object side surface in a paraxial region thereof.

15. The imaging lens system of claim 9, wherein, ​ 16. The imaging lens system of claim 9, wherein, ​

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