Imaging lens system

Abstract

An imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, arranged in ascending numerical order along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging plane of the imaging lens system. The imaging lens system satisfies the conditions 0.13 < ImgH / TTL < 0.16 and 5.3 < TTL / f < 5.5, where ImgH is the maximum effective image height on the imaging plane, TTL is the distance along the optical axis from the object side of the first lens to the imaging plane, and f is the focal length of the imaging lens system.

Description

Technical Field

[0001] [Cross-reference to related applications]

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2021-0164504 filed in the Korean Intellectual Property Office on November 25, 2021, and the entire disclosure of the Korean patent application is incorporated herein by reference for all purposes.

[0003] The present application relates to an imaging lens system that can be installed on a rear camera of a vehicle and a camera for autonomous driving of the vehicle. Prior Art

[0004] Recently manufactured vehicles may include cameras designed to reduce the risk of human and property damage caused by traffic accidents. For example, one or more cameras may be mounted on the front and rear bumpers of a vehicle to provide the driver with information about objects located in front and behind the vehicle. Vehicle cameras may require high-resolution performance because it is important for them to identify objects around the vehicle and provide this information to the driver. However, due to mounting space limitations, achieving high resolution in vehicle cameras can be difficult. For example, implementing a vehicle camera with a small f-number (i.e., a large aperture) may require increasing the diameter of the front lens and other lenses. However, due to structural and design limitations of the vehicle component (e.g., the bumper) in which the camera is mounted, it may be difficult to arbitrarily change the lens size. Summary of the Invention

[0005] This summary is provided to introduce a series of concepts in a simplified form that are further described in the detailed description below. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

[0006] In one 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, and a seventh lens, arranged in ascending numerical order along the optical axis of the imaging lens system from the object side of the imaging lens system toward an imaging plane of the imaging lens system, wherein the imaging lens system satisfies the conditional expressions 0.13 < ImgH / TTL < 0.16 and 5.3 < TTL / f < 5.5, where ImgH is the maximum effective image height on the imaging plane, TTL is the distance along the optical axis from the object side of the first lens to the imaging plane, and f is the focal length of the imaging lens system.

[0007] The second lens may have a concave object-side surface in a paraxial region thereof.

[0008] The fourth lens may have a convex image-side surface in its paraxial region.

[0009] The sixth lens may have a concave object-side surface in a paraxial region thereof.

[0010] The seventh lens may have a convex image-side surface in its paraxial region.

[0011] The second lens may have negative refractive power.

[0012] The fourth lens may have positive refractive power.

[0013] The sixth lens may have negative refractive power.

[0014] The imaging lens system may satisfy a conditional expression of 0.49 ≤ |f / f3| < 0.6, where f3 is the focal length of the third lens.

[0015] In another general aspect, an imaging lens system includes: a first lens having negative refractive power; a second lens having negative refractive power; a third lens having refractive power; a fourth lens having refractive power; a fifth lens having refractive power; a sixth lens having refractive power; and a seventh lens having refractive power, wherein the first to seventh lenses are arranged in ascending numerical order along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging plane of the imaging lens system, and the imaging lens system satisfies the conditional expression 5.3 < TTL / f < 5.5, wherein TTL is the distance along the optical axis from the object side of the first lens to the imaging plane, and f is the focal length of the imaging lens system.

[0016] The seventh lens may have a convex image-side surface in its paraxial region.

[0017] The seventh lens element may have an image-side surface having an inflection point.

[0018] The imaging lens system may satisfy a conditional expression of 0.03 < D34 / D12 < 0.20, where D12 is a distance along the optical axis from the image-side surface of the first lens to the object-side surface of the second lens, and D34 is a distance along the optical axis from the image-side surface of the third lens to the object-side surface of the fourth lens.

[0019] The imaging lens system may satisfy a conditional expression of 0.60 < D34 / D45 < 3.0, where D34 is a distance along the optical axis from the image-side surface of the third lens to the object-side surface of the fourth lens, and D45 is a distance along the optical axis from the image-side surface of the fourth lens to the object-side surface of the fifth lens.

[0020] The imaging lens system may satisfy a conditional expression of 2.8 < (R6+R7) / (R6-R7) < 5.8, where R6 is the radius of curvature of the image-side surface of the third lens at the optical axis, and R7 is the radius of curvature of the object-side surface of the fourth lens at the optical axis.

[0021] The imaging lens system may satisfy a conditional expression: -0.10 < (R8+R9) / (R8-R9) < 0.3, where R8 is a radius of curvature of an image-side surface of the fourth lens at the optical axis, and R9 is a radius of curvature of an object-side surface of the fifth lens at the optical axis.

[0022] Other features and aspects will become apparent from a review of the following detailed description, drawings, and claims. Simple diagram description

[0023] FIG. 1 is a diagram showing a first embodiment of an imaging lens system. FIG. 2 is an aberration curve of the imaging lens system shown in FIG. 1 . FIG3 is a diagram showing a second embodiment of an imaging lens system. FIG. 4 is an aberration curve of the imaging lens system shown in FIG. 3 . FIG5 is a diagram showing a third embodiment of an imaging lens system. FIG6 is an aberration curve of the imaging lens system shown in FIG5. FIG7 is a diagram showing a fourth embodiment of an imaging lens system. FIG8 is an aberration curve of the imaging lens system shown in FIG7. FIG9 is a diagram showing a fifth embodiment of an imaging lens system. FIG10 is an aberration curve of the imaging lens system shown in FIG9. FIG. 11 is a diagram illustrating a sixth embodiment of an imaging lens system. FIG12 is an aberration curve of the imaging lens system shown in FIG11. FIG13 is a diagram showing a seventh embodiment of an imaging lens system. FIG14 is an aberration curve of the imaging lens system shown in FIG13. FIG15 is a diagram showing an eighth embodiment of an imaging lens system. FIG16 is an aberration curve of the imaging lens system shown in FIG15. FIG17 is a diagram showing a ninth embodiment of an imaging lens system. FIG18 is an aberration curve of the imaging lens system shown in FIG17. FIG19 is a diagram showing a tenth embodiment of an imaging lens system. FIG20 is an aberration curve of the imaging lens system shown in FIG19. Throughout the drawings and detailed description, the same reference numerals refer to the same elements. The drawings may not be drawn to scale, and the relative sizes, proportions, and depictions of the elements in the drawings may be exaggerated for clarity, illustration, and convenience. Implementation Method

[0024] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, apparatuses, and / or systems described herein. However, various modifications, variations, and equivalents of the methods, apparatuses, 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 an example and is not intended to be limiting. Instead, as will become apparent upon understanding the disclosure of this application, operations other than those necessarily occurring in a specific order may be modified. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity.

[0025] The features described herein may be implemented in various forms and are not to 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 of implementing the methods, apparatuses, and / or systems described herein that will become apparent upon understanding the disclosure of this application.

[0026] When the word "may" is used herein when describing various examples (e.g., with respect to what an example may include or implement), it means that there is at least one example that includes or implements such a feature, but not all examples are limited thereto.

[0027] Throughout the specification, when an element, such as a layer, region, or substrate, is described as being “on,” “connected to,” or “coupled to” another element, the element may be directly “on,” “connected to,” or “coupled to” the other element, or one or more intervening elements may be present. Conversely, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, there may be no intervening elements.

[0028] As used herein, the term “and / or” includes any one and any combination of any two or more of the associated listed items.

[0029] Although terms such as "first," "second," and "third" may be used herein to describe various components, elements, regions, layers, or sections, these components, elements, elements, regions, layers, or sections are not limited by these terms. Rather, these terms are used solely to distinguish between the various components, elements, regions, layers, or sections. Therefore, a first component, element, region, layer, or section mentioned in the examples described herein could also be referred to as a second component, element, region, layer, or section without departing from the teachings of the examples.

[0030] For ease of description, spatially relative terms such as "above," "upper," "below," and "lower" may be used herein to describe the relationship of one element shown in the figures relative to another element. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, an element described as being "above" or "upper" relative to another element would now be "below" or "lower" relative to the other element. Thus, the term "above" encompasses both above and below orientations, depending on the spatial orientation of the device. The device may be otherwise oriented (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.

[0031] The terminology used herein is for illustrative purposes only and is not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the articles "a," "an," and "the" are intended to include the plural form. The terms "comprises," "includes," and "has" specify the presence of stated features, numbers, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, components, elements, and / or combinations thereof.

[0032] Due to manufacturing techniques and / or tolerances, the shapes shown in the drawings may vary. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shape that occur during manufacturing.

[0033] As will be apparent after understanding the disclosure of this application, the features of the examples described herein can be combined in various ways. In addition, although the examples described herein have multiple configurations, as will be apparent after understanding the disclosure of this application, other configurations are also possible.

[0034] In the drawings, the thickness, size, and shape of the lenses may be slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are merely examples. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings.

[0035] In the embodiments described herein, the first lens refers to the lens closest to the object (or subject), and the seventh lens refers to the lens closest to the imaging plane (or image sensor).

[0036] The unit of the curvature radius of the lens surface, the thickness of the lens and other optical elements, the gap between the lens and other optical elements, TTL (the distance from the object-side surface of the first lens element to the imaging plane), BFL (the distance from the image-side surface of the seventh lens element to the imaging plane), ImgH (the maximum effective image height at the imaging plane, which is equal to half the diagonal length of the effective imaging area of ​​the imaging plane), focal length, and the effective radius of the surfaces of the lenses and other optical elements is expressed in millimeters (mm).

[0037] The thickness of lenses and other optical components, the gap between lenses and other optical components, the TTL, and the BFL are measured along the optical axis of the imaging lens system. The radius of curvature of the lens surface is measured at the optical axis.

[0038] Unless otherwise stated, references to the shape of a lens surface refer to the shape of the paraxial region of the lens surface. The paraxial region of a lens surface is the central portion of the lens surface surrounding and including the optical axis of the lens surface, where light rays incident on the lens surface make a small angle θ with the optical axis, and the approximations sin°θ ≈ θ, tan°θ ≈ θ, and cos°θ ≈ 1 are valid.

[0039] For example, a statement that the object-side surface of a lens is convex means that at least the paraxial region of the object-side surface of the lens is convex, and a statement that the image-side surface of the lens is concave means that at least the paraxial region of the image-side surface of the lens is concave. Thus, even if the object-side surface of a lens can be described as convex, the entire object-side surface of the lens may not be convex, and a peripheral region of the object-side surface of the lens may be concave. Furthermore, even if the image-side surface of a lens can be described as concave, the entire image-side surface of the lens may not be concave, and a peripheral region of the image-side surface of the lens may be convex.

[0040] The effective aperture radius (or effective radius) of a lens surface is the radius of the portion of the lens surface through which light actually passes, and is not necessarily the radius of the outer edge of the lens surface. In other words, the effective aperture radius (or effective radius) of a lens surface is the distance perpendicular to the optical axis of the lens surface and the marginal ray passing through the lens surface. The object-side surface and the image-side surface of a lens may have different effective aperture radii or effective radii.

[0041] The imaging lens system of the embodiments described herein can be configured to be mounted on a transport device. For example, the imaging lens system can be mounted on front and rear surveillance cameras, or on autonomous driving cameras mounted on buses, trucks, fire trucks, forklifts, or other transport devices. However, the imaging lens system is not limited to the above examples. For example, the imaging lens system can be mounted on an imaging camera used for surveillance drones or transport drones.

[0042] The imaging lens system in the first embodiment may include a plurality of lenses. For example, the imaging lens system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, which are arranged in ascending numerical order along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging plane of the imaging lens system.

[0043] The imaging lens system in the first embodiment may satisfy a specific conditional expression. For example, the imaging lens system in the first embodiment may satisfy the conditional expression 0.13 < ImgH / TTL < 0.16, where ImgH is the maximum effective image height on the imaging plane, and TTL is the distance along the optical axis from the object-side surface of the first lens to the imaging plane.

[0044] As another example, the imaging lens system in the first embodiment may satisfy the conditional expression 5.3<TTL / f<5.5, where TTL is as described above and f is the focal length of the imaging lens system.

[0045] The imaging lens system in the second embodiment may include a plurality of lenses. For example, the imaging lens system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, which are arranged in ascending numerical order along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging plane of the imaging lens system.

[0046] The imaging lens system in the second embodiment may include a lens having a predetermined refractive power. For example, the imaging lens system in the second embodiment may include a first lens having a negative refractive power and a second lens having a negative refractive power. The imaging lens system in the second embodiment may satisfy a specific conditional expression. For example, the imaging lens system in the second embodiment may satisfy the conditional expression 5.3 < TTL / f < 5.5, where TTL and f are as described above.

[0047] The imaging lens system in the third embodiment can be configured to satisfy one or more of the following conditional expressions. For example, the imaging lens system in the third embodiment can include seven lenses and can satisfy two or more of the following conditional expressions. As another example, the imaging lens system in the third embodiment can include seven lenses and can be configured to satisfy all of the following conditional expressions. 0.13 < ImgH / TTL < 0.16 (Conditional Expression 1) 5.3 < TTL / f < 5.5 (Conditional Expression 2) 0.49 ≤ |f / f3| < 0.6 (Conditional Expression 3) L1ER1 / TTL < 0.5 (Conditional Expression 4) f2 / f3 < 0 (conditional expression 5) f5 / f6 < 0 (conditional expression 6) L1ER1 / ImgH < 3.0 (Conditional Expression 7) 25 < |V5-V6| (Conditional Expression 8) f56 < 0 (Conditional Expression 9) 80° < HFOV < 90° (Conditional Expression 10) 94° < DFOV < 104° (Conditional Expression 11)

[0048] In the conditional expressions listed above, ImgH is the maximum effective image height on the imaging plane, TTL is the distance along the optical axis from the object-side surface of the first lens to the imaging plane, f is the focal length of the imaging lens system, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, L1ER1 is the effective radius of the object-side surface of the first lens, V5 is the Abbe number of the fifth lens, V6 is the Abbe number of the sixth lens, f56 is the combined focal length of the fifth lens and the sixth lens, HFOV is the field of view of the imaging plane in the horizontal direction expressed in degrees, and DFOV is the field of view of the imaging plane in the diagonal direction expressed in degrees.

[0049] The imaging lens system in the third embodiment may satisfy some of the conditional expressions listed above in a more restricted manner as listed below: 0.26 < L1ER1 / TTL < 0.46 (Conditional Expression 12) -2.0 < f2 / f3 < -1.0 (Conditional Expression 13) -1.6 < f5 / f6 < -1.2 (Conditional Expression 14) 2.0 < L1ER1 / ImgH < 3.0 (Conditional Expression 15) -100 < f56 < -18 (Conditional Expression 16)

[0050] The imaging lens system in the fourth embodiment can be configured to satisfy one or more of the following conditional expressions. For example, the imaging lens system in the fourth embodiment can include seven lenses and can satisfy two or more of the following conditional expressions. As another example, the imaging lens system in the fourth embodiment can include seven lenses and can be configured to satisfy all of the following conditional expressions: 1.6 < f-number < 1.9 (Conditional Expression 17) 0.7 < ImgH / f < 1.0 (Conditional Expression 18) 0.03 < D34 / D12 < 0.20 (Conditional Expression 19) 0.60 < D34 / D45 < 3.0 (Conditional Expression 20) 1.64 < SumNd / 7 < 1.76 (Conditional Expression 21) 24 < SumV / SumNd < 29 (Conditional Expression 22) 2.8 < (R6+R7) / (R6-R7) < 5.8 (Conditional Expression 23) -0.10 < (R8+R9) / (R8-R9) < 0.3 (Conditional Expression 24) 0.08 mm / ° < L1ER1 / HFOV < 0.140 mm / ° (Conditional Expression 25)

[0051] In the conditional expressions listed above, the f-number is equal to the focal length f of the imaging lens system divided by the entrance pupil diameter of the imaging lens system and is a dimensionless quantity, D12 is the distance along the optical axis from the image-side surface of the first lens to the object-side surface of the second lens, D34 is the distance along the optical axis from the image-side surface of the third lens to the object-side surface of the fourth lens, D45 is the distance along the optical axis from the image-side surface of the fourth lens to the object-side surface of the fifth lens, SumV is the sum of the Abbe numbers of the first to seventh lenses, SumNd is the sum of the refractive indices of the first to seventh lenses, 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, and R9 is the radius of curvature of the object-side surface of the fifth lens.

[0052] The imaging lens systems in the embodiments may include one or more lenses having the properties described below. For example, the imaging lens system in the first embodiment may include one of the first through seventh lenses having the properties described below. As another example, the imaging lens systems in the second through fourth embodiments may include one or more of the first through seventh lenses having the properties described below. However, the imaging lens systems in the aforementioned embodiments do not necessarily include lenses having the properties described below. The first through seventh lenses will be described below.

[0053] The first lens may have a refractive power. For example, the first lens may have a negative refractive power. One surface of the first lens may be convex. For example, the first lens may have a convex object-side surface. The first lens may include a spherical surface. For example, both surfaces of the first lens may be spherical. The first lens may be formed of a material having high light transmissivity and excellent workability. For example, the first lens may be formed of a plastic material or a glass material. The first lens may be configured to have a predetermined refractive index. For example, the refractive index of the first lens may be greater than 1.7. For example, the refractive index of the first lens may be greater than 1.70 and less than 1.8. However, the refractive index of the first lens is not limited to the above range. For example, the first lens may have a refractive index less than 1.7 only when the refractive index of the second lens is greater than 1.9. The first lens may have a predetermined Abbe number. For example, the Abbe number of the first lens may be 40 or greater. For example, the Abbe number of the first lens may be greater than 40 and less than 82.

[0054] The second lens may have refractive power. For example, the second lens may have negative refractive power. One surface of the second lens may be concave. For example, the second lens may have a concave object-side surface. The second lens may include an aspherical surface. For example, both surfaces of the second lens may be aspherical. The second lens may be formed of a material having high light transmittance and excellent workability. For example, the second lens may be formed of a plastic material or a glass material. The second lens may be configured to have a predetermined refractive index. For example, the refractive index of the second lens may be greater than 1.5. For example, the refractive index of the second lens may be greater than 1.56 and less than 1.92. The second lens may have a predetermined Abbe number. For example, the Abbe number of the second lens may be 20 or greater. For example, the Abbe number of the second lens may be greater than 20 and less than 40.

[0055] The third lens may have refractive power. For example, the third lens may have positive refractive power. One surface of the third lens may be convex. For example, the third lens may have a convex object-side surface or a convex image-side surface. The third lens may include an aspherical surface. For example, both surfaces of the third lens may be aspherical. The third lens may be formed from a material having high light transmittance and excellent workability. For example, the third lens may be formed from a plastic material or a glass material. The third lens may be configured to have a predetermined refractive index. For example, the refractive index of the third lens may be greater than 1.6 and less than 1.9. The third lens may have a predetermined Abbe number. For example, the Abbe number of the third lens may be greater than 20 and less than 30.

[0056] The fourth lens may have refractive power. For example, the fourth lens may have positive refractive power. One surface of the fourth lens may be convex. For example, the fourth lens may have a convex image-side surface. The fourth lens may include a spherical surface. For example, both surfaces of the fourth lens may be spherical. The fourth lens may be formed from a material having high light transmittance and excellent workability. For example, the fourth lens may be formed from a plastic material or a glass material. The fourth lens may be configured to have a predetermined refractive index. For example, the refractive index of the fourth lens may be greater than 1.46 and less than 1.64. The fourth lens may have a predetermined Abbe number. For example, the Abbe number of the fourth lens may be greater than 56 and less than 90.

[0057] The fifth lens may have refractive power. For example, the fifth lens may have positive refractive power. One surface of the fifth lens may be convex. For example, the fifth lens may have a convex object-side surface. The fifth lens may include a spherical surface. For example, both surfaces of the fifth lens may be spherical. The fifth lens may be formed of a material having high light transmittance and excellent workability. For example, the fifth lens may be formed of a plastic material or a glass material. The fifth lens may be configured to have a predetermined refractive index. For example, the refractive index of the fifth lens may be greater than 1.56. For example, the refractive index of the fifth lens may be greater than 1.56 and less than 1.70. The fifth lens may have a predetermined Abbe number. For example, the Abbe number of the fifth lens may be 50 or greater. For example, the Abbe number of the fifth lens may be greater than 52 and less than 64.

[0058] The sixth lens may have refractive power. For example, the sixth lens may have negative refractive power. One surface of the sixth lens may be concave. As an example, the sixth lens may have a concave object-side surface. The sixth lens may include a spherical surface. For example, both surfaces of the sixth lens may be spherical. The sixth lens may be formed from a material having high light transmittance and excellent workability. For example, the sixth lens may be formed from a plastic material or a glass material. The sixth lens may be configured to have a predetermined refractive index. For example, the refractive index of the sixth lens may be greater than 1.70 and less than 1.80. The sixth lens may have a predetermined Abbe number. For example, the Abbe number of the sixth lens may be greater than 20 and less than 30.

[0059] The seventh lens may have refractive power. For example, the seventh lens may have positive refractive power. One surface of the seventh lens may be convex. For example, the seventh lens may have a convex image-side surface. The seventh lens may include an aspherical surface. For example, both surfaces of the seventh lens may be aspherical. The seventh lens may include an inflection point. For example, an inflection point may be formed on at least one of the object-side surface and the image-side surface of the seventh lens. The seventh lens may be formed of a material having high light transmittance and excellent workability. For example, the seventh lens may be formed of a plastic material or a glass material. The seventh lens may be configured to have a predetermined refractive index. For example, the refractive index of the seventh lens may be greater than 1.60 and less than 1.90. The seventh lens may have a predetermined Abbe number. For example, the Abbe number of the seventh lens may be greater than 40 and less than 64.

[0060] As described above, the first to seventh lenses may include spherical surfaces or aspherical surfaces. The aspherical surfaces of the lenses may be represented by the following equation 1. ...(1)

[0061] In Equation 1, c is the curvature of the lens surface and is equal to the inverse of the radius of curvature of the lens surface at the optical axis of the lens surface, k is the conic constant, r is the distance from any point on the lens surface to the optical axis of the lens surface in a direction perpendicular to the optical axis of the lens surface, A, B, C, D, E, F, G, H, and J are aspheric constants, and Z (or sag) is the distance from a point on the lens surface a distance r from the optical axis of the lens surface in a direction parallel to the optical axis of the lens surface to a tangent plane perpendicular to the optical axis and intersecting the vertex of the lens surface.

[0062] The imaging lens system in the above-described embodiments may further include a stop, a filter, and a cover glass. As an example, the imaging lens system may further include a stop disposed between the fourth lens and the fifth lens. As another example, the imaging lens system may further include a filter and a cover glass disposed between the seventh lens and the imaging plane. The stop may be configured to adjust the amount of light incident on the imaging plane. The filter may be configured to block a specific wavelength or range of wavelengths of light, and the cover glass may be configured to prevent foreign matter from reaching the imaging plane. As an example, the filter may be configured to block infrared light, but may also or alternatively be configured to block ultraviolet light.

[0063] FIG. 1 is a diagram illustrating a first embodiment of an imaging lens system, and FIG. 2 is an aberration curve of the imaging lens system shown in FIG. 1 .

[0064] 1 , an 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 , and a seventh lens 170 .

[0065] The first lens 110 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 120 may have negative refractive power and may have a concave object-side surface and a convex image-side surface. The third lens 130 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The fourth lens 140 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 150 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 160 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 170 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. An inflection point may be formed on the image-side surface of the seventh lens 170. The fifth lens 150 and the sixth lens 160 may be combined with each other. More specifically, the radius of curvature of the image-side surface of the fifth lens 150 and the radius of curvature of the object-side surface of the sixth lens 160 may be configured to be substantially the same, and the image-side surface of the fifth lens 150 may be in contact with the object-side surface of the sixth lens 160 at the center of the optical axis.

[0066] The imaging lens system 100 may further include an aperture ST, an optical filter IF, a cover glass CG, and an imaging plane IP. The aperture ST may be disposed between the fourth lens 140 and the fifth lens 150, and the optical filter IF and the cover glass CG may be disposed between the seventh lens 170 and the imaging plane IP. The imaging plane IP may be formed at a location where light incident through the first lens 110 to the seventh lens 170 is focused. For example, the imaging plane IP may be formed on a surface of the image sensor IS of the camera module or within the image sensor IS.

[0067] Tables 1 and 2 below list the lens properties and aspheric values ​​of the first embodiment of the imaging lens system. Table 1 Surface number Components Radius of curvature Thickness / distance Refractive index Abbe number Effective radius S1 First lens 27.2287 0.6000 1.777 49.6 4.692 S2 4.5548 4.9502 3.542 S3 Second lens -3.3431 1.6907 1.601 30.4 3.003 S4 -6.6665 0.1000 3.269 S5 The third lens 6.2933 2.1939 1.618 26.3 3.423 S6 -36.9517 0.1906 3.208 S7 Fourth lens -24.3693 1.3176 1.623 60.3 3.186 S8 -12.5741 0.0000 3.024 S9 aperture infinity 0.3000 2.865 S10 Fifth lens 8.2508 2.8899 1.618 60.6 3.025 S11 Sixth lens -3.9900 0.6000 1.749 28.1 2.984 S12 6.6444 0.1000 3.105 S13 Seventh lens 7.7338 1.6902 1.650 55.5 3.132 S14 -10.2819 2.7218 3.186 S15 filter infinity 0.4000 1.519 64.2 3.432 S16 infinity 0.5500 3.454 S17 cover glass infinity 0.4000 1.519 64.2 3.498 S18 infinity 3.8036 3.519 S19 Imaging plane infinity 0.0015 3.827 Table 2 Surface number S3 S4 S5 S6 S13 S14 k -1.26022E+00 -2.71647E+00 -2.04937E-01 -5.87526E+01 0.00000E+00 0.00000E+00 A 2.59351E-03 2.46173E-03 -1.65008E-05 -1.57045E-04 2.44654E-04 1.10893E-03 B -1.10782E-04 -2.47393E-05 2.58956E-05 6.35081E-05 2.80354E-05 3.28342E-05 C 5.54083E-07 -6.16987E-07 7.87004E-08 -1.02142E-06 -7.33986E-07 2.71772E-07 D 0 0 0 0 4.00308E-08 4.64438E-08 E 0 0 0 0 0 0 F 0 0 0 0 0 0 G 0 0 0 0 0 0 H 0 0 0 0 0 0 J 0 0 0 0 0 0

[0068] FIG3 is a diagram illustrating a second embodiment of an imaging lens system, and FIG4 is an aberration curve of the imaging lens system shown in FIG3.

[0069] 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 , and a seventh lens 270 .

[0070] The first lens 210 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 220 may have negative refractive power and may have a concave object-side surface and a convex image-side surface. The third lens 230 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The fourth lens 240 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 250 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 260 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 270 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The image-side surface of the seventh lens 270 may have an inflection point. The fifth lens 250 and the sixth lens 260 may be combined with each other. More specifically, the radius of curvature of the image-side surface of the fifth lens 250 and the radius of curvature of the object-side surface of the sixth lens 260 may be configured to be substantially the same, and the image-side surface of the fifth lens 250 may be in contact with the object-side surface of the sixth lens 260 at the center of the optical axis.

[0071] The imaging lens system 200 may further include an aperture ST, an optical filter IF, a cover glass CG, and an imaging plane IP. The aperture ST may be disposed between the fourth lens 240 and the fifth lens 250, and the optical filter IF and the cover glass CG may be disposed between the seventh lens 270 and the imaging plane IP. The imaging plane IP may be formed at a location where light incident through the first lens 210 to the seventh lens 270 is focused. For example, the imaging plane IP may be formed on a surface of the image sensor IS of the camera module or within the image sensor IS.

[0072] Tables 3 and 4 below list the lens properties and aspheric values ​​of the second embodiment of the imaging lens system. Table 3 Surface number Components Radius of curvature Thickness / distance Refractive index Abbe number Effective radius S1 First lens 34.2208 0.6000 1.777 49.6 4.708 S2 4.6587 4.8374 3.569 S3 Second lens -2.9907 1.3789 1.586 34.7 3.135 S4 -5.2871 0.1000 3.425 S5 The third lens 6.7569 2.6405 1.608 28.0 3.589 S6 -29.2590 0.6275 3.287 S7 Fourth lens -18.2154 1.0150 1.535 66.0 3.156 S8 -10.2202 0.0000 3.054 S9 aperture infinity 0.3000 2.865 S10 Fifth lens 7.2801 2.4907 1.606 61.3 3.114 S11 Sixth lens -6.0000 0.6000 1.762 27.6 3.080 S12 6.0978 0.1000 3.127 S13 Seventh lens 7.0663 1.9275 1.623 60.3 3.157 S14 -10.4315 2.7218 3.221 S15 filter infinity 0.4000 1.519 64.2 3.454 S16 infinity 0.5500 3.474 S17 cover glass infinity 0.4000 1.519 64.2 3.515 S18 infinity 3.8082 3.535 S19 Imaging plane infinity 0.0000 3.827 Table 4 Surface number S3 S4 S5 S6 S13 S14 k -1.34648E+00 -2.44187E+00 -2.42564E-01 -7.80509E+01 0.00000E+00 0.00000E+00 A 2.77606E-03 2.42651E-03 -5.40172E-05 -9.03204E-05 3.37739E-04 1.09522E-03 B -1.20855E-04 -2.00450E-05 2.86947E-05 6.42230E-05 2.89340E-05 3.44935E-05 C 2.09243E-07 -1.37096E-06 1.94235E-07 -5.88885E-08 -9.00864E-07 -3.86445E-08 D 0 0 0 0 3.40525E-08 4.16807E-08 E 0 0 0 0 0 0 F 0 0 0 0 0 0 G 0 0 0 0 0 0 H 0 0 0 0 0 0 J 0 0 0 0 0 0

[0073] FIG5 is a diagram illustrating a third embodiment of an imaging lens system, and FIG6 is an aberration curve of the imaging lens system shown in FIG5.

[0074] 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 , and a seventh lens 370 .

[0075] The first lens 310 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 320 may have negative refractive power and may have a concave object-side surface and a convex image-side surface. The third lens 330 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The fourth lens 340 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 350 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 360 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 370 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The image-side surface of the seventh lens 370 may have an inflection point. The fifth lens 350 and the sixth lens 360 may be combined with each other. More specifically, the radius of curvature of the image-side surface of the fifth lens 350 and the radius of curvature of the object-side surface of the sixth lens 360 may be configured to be substantially the same, and the image-side surface of the fifth lens 350 may be in contact with the object-side surface of the sixth lens 360 at the center of the optical axis.

[0076] The imaging lens system 300 may further include an aperture ST, an optical filter IF, a cover glass CG, and an imaging plane IP. The aperture ST may be disposed between the fourth lens 340 and the fifth lens 350, and the optical filter IF and the cover glass CG may be disposed between the seventh lens 370 and the imaging plane IP. The imaging plane IP may be formed at a location where light incident through the first lens 310 to the seventh lens 370 is focused. For example, the imaging plane IP may be formed on a surface of the image sensor IS of the camera module or within the image sensor IS.

[0077] Tables 5 and 6 below list the lens properties and aspheric values ​​of the third embodiment of the imaging lens system. Table 5 Surface number Components Radius of curvature Thickness / distance Refractive index Abbe number Effective radius S1 First lens 23.1884 0.6500 1.777 49.6 4.789 S2 4.5162 5.1326 3.578 S3 Second lens -3.2754 1.4695 1.722 30.7 2.979 S4 -6.1331 0.1000 3.261 S5 The third lens 6.9693 2.5463 1.699 27.9 3.421 S6 -28.5661 0.5409 3.184 S7 Fourth lens -19.2482 0.8799 1.559 65.5 3.090 S8 -10.0461 0.0000 3.052 S9 aperture infinity 0.3000 2.993 S10 Fifth lens 8.7504 2.8431 1.609 57.8 2.981 S11 Sixth lens -4.4919 0.6500 1.753 26.1 2.937 S12 7.6962 0.1000 3.078 S13 Seventh lens 9.9616 1.5838 1.648 53.5 3.081 S14 -9.5299 2.7218 3.146 S15 filter infinity 0.4000 1.519 64.2 3.416 S16 infinity 0.5500 3.439 S17 cover glass infinity 0.4000 1.519 64.2 3.486 S18 infinity 3.6292 3.509 S19 Imaging plane infinity 0.0000 3.826 Table 6 Surface number S3 S4 S5 S6 S13 S14 k -1.37253E+00 -2.57160E+00 -2.68985E-01 -5.58542E+01 0.00000E+00 0.00000E+00 A 2.81547E-03 2.46100E-03 -6.51837E-05 -8.20675E-05 3.68914E-04 1.04387E-03 B -1.27300E-04 -2.23332E-05 2.75520E-05 5.79077E-05 3.20447E-05 3.14249E-05 C 1.40530E-06 -1.41928E-06 -3.23353E-07 -7.82116E-07 -1.32687E-07 1.64455E-06 D -7.30335E-08 0 0 0 0 0 E 0 0 0 0 0 0 F 0 0 0 0 0 0 G 0 0 0 0 0 0 H 0 0 0 0 0 0 J 0 0 0 0 0 0

[0078] FIG7 is a diagram illustrating a fourth embodiment of an imaging lens system, and FIG8 is an aberration curve of the imaging lens system shown in FIG7.

[0079] 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 , and a seventh lens 470 .

[0080] The first lens 410 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 420 may have negative refractive power and may have a concave object-side surface and a convex image-side surface. The third lens 430 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The fourth lens 440 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 450 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 460 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 470 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The image-side surface of the seventh lens 470 may have an inflection point. The fifth lens 450 and the sixth lens 460 may be combined with each other. More specifically, the radius of curvature of the image-side surface of the fifth lens 450 and the radius of curvature of the object-side surface of the sixth lens 460 may be configured to be substantially the same, and the image-side surface of the fifth lens 450 may be in contact with the object-side surface of the sixth lens 460 at the center of the optical axis.

[0081] The imaging lens system 400 may further include an aperture ST, an optical filter IF, a cover glass CG, and an imaging plane IP. The aperture ST may be disposed between the fourth lens 440 and the fifth lens 450, and the optical filter IF and the cover glass CG may be disposed between the seventh lens 470 and the imaging plane IP. The imaging plane IP may be formed at a location where light incident through the first lens 410 through the seventh lens 470 is focused. For example, the imaging plane IP may be formed on a surface of the image sensor IS of the camera module or within the image sensor IS.

[0082] Tables 7 and 8 below list the lens properties and aspheric values ​​of the fourth embodiment of the imaging lens system. Table 7 Surface number Components Radius of curvature Thickness / distance Refractive index Abbe number Effective radius S1 First lens 16.3708 0.6000 1.777 49.6 4.972 S2 4.5113 5.1140 3.716 S3 Second lens -3.5483 1.6447 1.877 31.1 3.057 S4 -7.1741 0.2664 3.347 S5 The third lens 6.9348 2.0886 1.713 27.7 3.573 S6 -30.0100 0.6818 3.394 S7 Fourth lens -19.4052 0.8931 1.542 69.0 3.224 S8 -10.7718 0.0000 3.128 S9 aperture infinity 0.3000 2.928 S10 Fifth lens 8.5417 3.1464 1.607 58.0 3.107 S11 Sixth lens -4.2751 0.6000 1.749 25.7 3.070 S12 7.7675 0.1006 3.214 S13 Seventh lens 10.2983 1.4257 1.735 47.1 3.214 S14 -10.5262 2.7218 3.245 S15 filter infinity 0.4000 1.519 64.2 3.473 S16 infinity 0.5500 3.493 S17 cover glass infinity 0.4000 1.519 64.2 3.534 S18 infinity 3.5669 3.554 S19 Imaging plane infinity 0.0000 3.832 Table 8 Surface number S3 S4 S5 S6 S13 S14 k -1.41513E+00 -2.61666E+00 -2.77108E-01 -5.37751E+01 0.00000E+00 0.00000E+00 A 2.91518E-03 2.47729E-03 -6.87241E-05 -1.06289E-04 4.31147E-04 1.10599E-03 B -1.23618E-04 -2.08587E-05 2.69573E-05 5.39755E-05 2.95271E-05 3.56385E-05 C 1.81365E-06 -1.19453E-06 -3.27656E-07 -8.91816E-07 1.79876E-07 1.74588E-06 D -5.62274E-08 0 0 0 0 0 E 0 0 0 0 0 0 F 0 0 0 0 0 0 G 0 0 0 0 0 0 H 0 0 0 0 0 0 J 0 0 0 0 0 0

[0083] FIG9 is a diagram illustrating a fifth embodiment of an imaging lens system, and FIG10 is an aberration curve of the imaging lens system shown in FIG9.

[0084] 9 , 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 , and a seventh lens 570 .

[0085] The first lens 510 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 520 may have negative refractive power and may have a concave object-side surface and a convex image-side surface. The third lens 530 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The fourth lens 540 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 550 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 560 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 570 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The image-side surface of the seventh lens 570 may have an inflection point. The fifth lens 550 and the sixth lens 560 may be combined with each other. More specifically, the radius of curvature of the image-side surface of the fifth lens 550 and the radius of curvature of the object-side surface of the sixth lens 560 can be configured to be substantially the same, and the image-side surface of the fifth lens 550 can be in contact with the object-side surface of the sixth lens 560 at the center of the optical axis.

[0086] The imaging lens system 500 may further include an aperture ST, an optical filter IF, a cover glass CG, and an imaging plane IP. The aperture ST may be disposed between the fourth lens 540 and the fifth lens 550, and the optical filter IF and the cover glass CG may be disposed between the seventh lens 570 and the imaging plane IP. The imaging plane IP may be formed at a location where light incident through the first lens 510 to the seventh lens 570 is focused. For example, the imaging plane IP may be formed on a surface of the image sensor IS of the camera module or within the image sensor IS.

[0087] Tables 9 and 10 below list the lens properties and aspheric values ​​of the fifth embodiment of the imaging lens system. Table 9 Surface number Components Radius of curvature Thickness / distance Refractive index Abbe number Effective radius S1 First lens 19.1919 0.6000 1.777 49.6 4.891 S2 4.4868 4.9686 3.653 S3 Second lens -3.5939 1.6680 1.814 32.0 3.097 S4 -7.2852 0.1000 3.426 S5 The third lens 7.0500 1.9718 1.754 27.7 3.658 S6 -30.9595 0.6497 3.494 S7 Fourth lens -16.0765 1.6036 1.609 57.8 3.361 S8 -9.0919 0.0000 3.208 S9 aperture infinity 0.3000 2.919 S10 Fifth lens 8.1759 2.4946 1.628 55.5 3.079 S11 Sixth lens -4.3502 0.6000 1.769 25.0 3.045 S12 11.0043 0.8000 3.114 S13 Seventh lens 14.0791 1.3776 1.603 58.6 3.379 S14 -11.6573 2.7218 3.388 S15 filter infinity 0.4000 1.519 64.2 3.566 S16 infinity 0.5500 3.582 S17 cover glass infinity 0.4000 1.519 64.2 3.615 S18 infinity 3.2946 3.630 S19 Imaging plane infinity 0.0000 3.827 Table 10 Surface number S3 S4 S5 S6 S13 S14 k -1.35785E+00 -2.56521E+00 -2.64203E-01 -4.09982E+01 0.00000E+00 0.00000E+00 A 2.77907E-03 2.42620E-03 -6.65400E-05 -1.23359E-04 3.10948E-04 1.25100E-03 B -1.34868E-04 -3.09190E-05 2.68557E-05 5.81456E-05 2.69251E-05 3.38497E-05 C 2.97043E-06 -9.42852E-07 -7.20636E-08 -6.31487E-07 1.21524E-06 1.85444E-06 D -1.21191E-07 0 0 0 0 0 E 0 0 0 0 0 0 F 0 0 0 0 0 0 G 0 0 0 0 0 0 H 0 0 0 0 0 0 J 0 0 0 0 0 0

[0088] FIG11 is a diagram showing a sixth embodiment of an imaging lens system, and FIG12 is an aberration curve of the imaging lens system shown in FIG11.

[0089] 11 , the 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 , and a seventh lens 670 .

[0090] The first lens 610 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 620 may have negative refractive power and may have a concave object-side surface and a convex image-side surface. The third lens 630 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The fourth lens 640 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 650 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 660 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 670 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The image-side surface of the seventh lens 670 may have an inflection point. The fifth lens 650 and the sixth lens 660 may be combined with each other. More specifically, the radius of curvature of the image-side surface of the fifth lens 650 and the radius of curvature of the object-side surface of the sixth lens 660 may be configured to be substantially the same, and the image-side surface of the fifth lens 650 may be in contact with the object-side surface of the sixth lens 660 at the center of the optical axis.

[0091] The imaging lens system 600 may further include an aperture ST, an optical filter IF, a cover glass CG, and an imaging plane IP. The aperture ST may be disposed between the fourth lens 640 and the fifth lens 650, and the optical filter IF and the cover glass CG may be disposed between the seventh lens 670 and the imaging plane IP. The imaging plane IP may be formed at a location where light incident through the first lens 610 through the seventh lens 670 is focused. For example, the imaging plane IP may be formed on a surface of the image sensor IS of the camera module or within the image sensor IS.

[0092] Tables 11 and 12 below list the lens properties and aspheric values ​​of the sixth embodiment of the imaging lens system. Table 11 Surface number Components Radius of curvature Thickness / distance Refractive index Abbe number Effective radius S1 First lens 16.6536 0.6000 1.777 49.6 4.896 S2 4.3915 4.9034 3.639 S3 Second lens -3.6380 1.6479 1.817 28.6 3.081 S4 -7.4329 0.4000 3.378 S5 The third lens 7.0805 1.7442 1.750 26.1 3.637 S6 -30.0069 0.6382 3.517 S7 Fourth lens -16.7446 1.6023 1.559 65.6 3.378 S8 -9.2538 0.0000 3.198 S9 aperture infinity 0.3000 2.919 S10 Fifth lens 8.8333 2.5215 1.632 55.2 3.057 S11 Sixth lens -4.1692 0.6000 1.770 25.0 3.026 S12 10.6835 0.4000 3.120 S13 Seventh lens 13.8285 1.5710 1.622 56.3 3.260 S14 -10.8697 2.7218 3.289 S15 filter infinity 0.4000 1.519 64.2 3.501 S16 infinity 0.5500 3.520 S17 cover glass infinity 0.4000 1.519 64.2 3.559 S18 infinity 3.4997 3.577 S19 Imaging plane infinity 0.0000 3.827 Table 12 Surface number S3 S4 S5 S6 S13 S14 k -1.37430E+00 -2.73477E+00 -2.34952E-01 -4.88088E+01 0.00000E+00 0.00000E+00 A 2.80317E-03 2.45675E-03 -5.35972E-05 -1.24562E-04 3.38486E-04 1.27979E-03 B -1.36388E-04 -3.08647E-05 2.75344E-05 5.58890E-05 3.13715E-05 3.51918E-05 C 3.24503E-06 -7.22831E-07 -1.18602E-08 -6.94896E-07 1.04575E-06 2.25264E-06 D -1.22944E-07 0 0 0 0 0 E 0 0 0 0 0 0 F 0 0 0 0 0 0 G 0 0 0 0 0 0 H 0 0 0 0 0 0 J 0 0 0 0 0 0

[0093] FIG13 is a diagram showing a seventh embodiment of an imaging lens system, and FIG14 is an aberration curve of the imaging lens system shown in FIG13.

[0094] 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 , and a seventh lens 770 .

[0095] The first lens 710 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 720 may have negative refractive power and may have a concave object-side surface and a convex image-side surface. The third lens 730 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The fourth lens 740 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 750 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 760 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 770 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. An inflection point may be formed on the image-side surface of the seventh lens 770. The fifth lens 750 and the sixth lens 760 may be combined with each other. In more detail, the radius of curvature of the image-side surface of the fifth lens 750 and the radius of curvature of the object-side surface of the sixth lens 760 can be configured to be substantially the same, and the image-side surface of the fifth lens 750 can be in contact with the object-side surface of the sixth lens 760 at the center of the optical axis.

[0096] The imaging lens system 700 may further include an aperture ST, an optical filter IF, a cover glass CG, and an imaging plane IP. The aperture ST may be disposed between the fourth lens 740 and the fifth lens 750, and the optical filter IF and the cover glass CG may be disposed between the seventh lens 770 and the imaging plane IP. The imaging plane IP may be formed at a location where light incident through the first lens 710 to the seventh lens 770 is focused. For example, the imaging plane IP may be formed on a surface of the image sensor IS of the camera module or within the image sensor IS.

[0097] Tables 13 and 14 below list the lens properties and aspheric values ​​of the seventh embodiment of the imaging lens system. Table 13 Surface number Components Radius of curvature Thickness / distance Refractive index Abbe number Effective radius S1 First lens 16.1626 0.6000 1.777 49.6 4.895 S2 4.3633 4.7502 3.633 S3 Second lens -3.6903 1.5571 1.798 31.9 3.120 S4 -7.5730 0.6000 3.386 S5 The third lens 7.1387 1.7514 1.753 26.8 3.673 S6 -29.5482 0.4968 3.553 S7 Fourth lens -17.0790 1.6585 1.501 80.6 3.465 S8 -9.1529 0.0000 3.259 S9 aperture infinity 0.3000 2.965 S10 Fifth lens 9.2570 2.6240 1.640 54.3 3.094 S11 Sixth lens -4.1184 0.6000 1.777 24.8 3.059 S12 10.1395 0.4000 3.163 S13 Seventh lens 12.4033 1.6378 1.697 49.6 3.338 S14 -12.6823 2.7218 3.337 S15 filter infinity 0.4000 1.519 64.2 3.528 S16 infinity 0.5500 3.545 S17 cover glass infinity 0.4000 1.519 64.2 3.581 S18 infinity 3.4524 3.598 S19 Imaging plane infinity 0.0000 3.827 Table 14 Surface number S3 S4 S5 S6 S13 S14 k -1.42428E+00 -3.19630E+00 -2.14262E-01 -6.84015E+01 0.00000E+00 0.00000E+00 A 2.86234E-03 2.51994E-03 -4.01721E-05 -1.43060E-04 4.94696E-04 1.32352E-03 B -1.45168E-04 -3.49901E-05 2.55250E-05 5.27135E-05 3.00677E-05 3.62756E-05 C 3.61538E-06 -5.74516E-07 4.18969E-08 -6.10374E-07 9.45284E-07 2.22051E-06 D -1.31695E-07 0 0 0 0 0 E 0 0 0 0 0 0 F 0 0 0 0 0 0 G 0 0 0 0 0 0 H 0 0 0 0 0 0 J 0 0 0 0 0 0

[0098] FIG15 is a diagram showing an eighth embodiment of an imaging lens system, and FIG16 is an aberration curve of the imaging lens system shown in FIG15.

[0099] 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 , and a seventh lens 870 .

[0100] The first lens 810 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 820 may have negative refractive power and may have a concave object-side surface and a convex image-side surface. The third lens 830 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The fourth lens 840 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 850 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 860 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 870 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The image-side surface of the seventh lens 870 may have an inflection point. The fifth lens 850 and the sixth lens 860 may be combined with each other. More specifically, the radius of curvature of the image-side surface of the fifth lens 850 and the radius of curvature of the object-side surface of the sixth lens 860 can be configured to be substantially the same, and the image-side surface of the fifth lens 850 can be in contact with the object-side surface of the sixth lens 860 at the center of the optical axis.

[0101] The imaging lens system 800 may further include an aperture ST, an optical filter IF, a cover glass CG, and an imaging plane IP. The aperture ST may be disposed between the fourth lens 840 and the fifth lens 850, and the optical filter IF and the cover glass CG may be disposed between the seventh lens 870 and the imaging plane IP. The imaging plane IP may be formed at a location where light incident through the first lens 810 to the seventh lens 870 is focused. For example, the imaging plane IP may be formed on a surface of the image sensor IS of the camera module or within the image sensor IS.

[0102] Tables 15 and 16 below list the lens properties and aspheric values ​​of the eighth embodiment of the imaging lens system. Table 15 Surface number Components Radius of curvature Thickness / distance Refractive index Abbe number Effective radius S1 First lens 15.0650 0.6000 1.777 49.6 4.938 S2 4.3982 4.7494 3.673 S3 Second lens -3.8361 1.5971 1.872 32.5 3.110 S4 -8.2125 0.6000 3.359 S5 The third lens 7.1102 1.7223 1.772 26.9 3.664 S6 -29.8213 0.4878 3.550 S7 Fourth lens -17.3620 1.7015 1.500 81.0 3.464 S8 -9.2978 0.0000 3.249 S9 aperture infinity 0.3000 2.965 S10 Fifth lens 9.2182 2.6927 1.647 53.6 3.097 S11 Sixth lens -4.0666 0.6000 1.784 24.5 3.061 S12 9.9762 0.4000 3.171 S13 Seventh lens 13.1196 1.5210 1.758 45.9 3.346 S14 -13.2757 2.7218 3.337 S15 filter infinity 0.4000 1.519 64.2 3.527 S16 infinity 0.5500 3.544 S17 cover glass infinity 0.4000 1.519 64.2 3.580 S18 infinity 3.4565 3.598 S19 Imaging plane infinity 0.0000 3.826 Table 16 Surface number S3 S4 S5 S6 S13 S14 k -1.46074E+00 -3.43384E+00 -2.20716E-01 -7.80143E+01 0.00000E+00 0.00000E+00 A 2.91563E-03 2.55480E-03 -4.12789E-05 -1.53​​185E-04 5.91838E-04 1.32233E-03 B -1.46012E-04 -3.50124E-05 2.40618E-05 5.12545E-05 2.94577E-05 3.80176E-05 C 3.70225E-06 -4.37633E-07 7.48676E-08 -5.80952E-07 1.00705E-06 2.22702E-06 D -1.14625E-07 0 0 0 0 0 E 0 0 0 0 0 0 F 0 0 0 0 0 0 G 0 0 0 0 0 0 H 0 0 0 0 0 0 J 0 0 0 0 0 0

[0103] FIG17 is a diagram showing a ninth embodiment of the imaging lens system, and FIG18 is an aberration curve of the imaging lens system shown in FIG17.

[0104] 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 , and a seventh lens 970 .

[0105] The first lens 910 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 920 may have negative refractive power and may have a concave object-side surface and a convex image-side surface. The third lens 930 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The fourth lens 940 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 950 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 960 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 970 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The image-side surface of the seventh lens 970 may have an inflection point. The fifth lens 950 and the sixth lens 960 may be combined with each other. More specifically, the radius of curvature of the image-side surface of the fifth lens 950 and the radius of curvature of the object-side surface of the sixth lens 960 can be configured to be substantially the same, and the image-side surface of the fifth lens 950 can be in contact with the object-side surface of the sixth lens 960 at the center of the optical axis.

[0106] The imaging lens system 900 may further include an aperture ST, an optical filter IF, a cover glass CG, and an imaging plane IP. The aperture ST may be disposed between the fourth lens 940 and the fifth lens 950, and the optical filter IF and the cover glass CG may be disposed between the seventh lens 970 and the imaging plane IP. The imaging plane IP may be formed at a location where light incident through the first lens 910 through the seventh lens 970 is focused. For example, the imaging plane IP may be formed on a surface of the image sensor IS of the camera module or within the image sensor IS.

[0107] Tables 17 and 18 below list the lens properties and aspheric values ​​of the ninth embodiment of the imaging lens system. Table 17 Surface number Components Radius of curvature Thickness / distance Refractive index Abbe number Effective radius S1 First lens 17.3122 0.6000 1.719 48.1 4.995 S2 4.3799 4.6314 3.673 S3 Second lens -3.9437 1.5894 1.883 34.6 3.149 S4 -8.6781 0.6000 3.398 S5 The third lens 7.1248 1.8038 1.779 26.9 3.739 S6 -29.8527 0.4328 3.616 S7 Fourth lens -17.4933 1.7703 1.499 81.6 3.557 S8 -9.2736 0.0000 3.341 S9 aperture infinity 0.3000 2.965 S10 Fifth lens 9.3357 2.6629 1.654 53.0 3.150 S11 Sixth lens -4.0851 0.6000 1.790 24.3 3.116 S12 10.3206 0.4000 3.227 S13 Seventh lens 13.2137 1.5968 1.777 44.9 3.412 S14 -13.8555 2.7218 3.386 S15 filter infinity 0.4000 1.519 64.2 3.557 S16 infinity 0.5500 3.572 S17 cover glass infinity 0.4000 1.519 64.2 3.605 S18 infinity 3.4409 3.620 S19 Imaging plane infinity 0.0000 3.826 Table 18 Surface number S3 S4 S5 S6 S13 S14 k -1.46450E+00 -3.65234E+00 -2.20978E-01 -8.73938E+01 0.00000E+00 0.00000E+00 A 2.90752E-03 2.56648E-03 -4.08368E-05 -1.57674E-04 6.35293E-04 1.33318E-03 B -1.50550E-04 -3.89931E-05 2.33950E-05 5.08818E-05 2.96639E-05 3.80317E-05 C 3.94211E-06 -2.66328E-07 8.20802E-08 -5.50635E-07 9.00507E-07 2.15142E-06 D -1.16696E-07 0 0 0 0 0 E 0 0 0 0 0 0 F 0 0 0 0 0 0 G 0 0 0 0 0 0 H 0 0 0 0 0 0 J 0 0 0 0 0 0

[0108] FIG19 is a diagram showing a tenth embodiment of an imaging lens system, and FIG20 is an aberration curve of the imaging lens system shown in FIG19.

[0109] 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 , and a seventh lens 1070 .

[0110] The first lens 1010 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 1020 may have negative refractive power and may have a concave object-side surface and a convex image-side surface. The third lens 1030 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The fourth lens 1040 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 1050 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 1060 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 1070 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. An inflection point may be formed on the image-side surface of the seventh lens 1070. The fifth lens 1050 and the sixth lens 1060 may be combined with each other. More specifically, the radius of curvature of the image-side surface of the fifth lens 1050 and the radius of curvature of the object-side surface of the sixth lens 1060 may be configured to be substantially the same, and the image-side surface of the fifth lens 1050 may be in contact with the object-side surface of the sixth lens 1060 at the center of the optical axis.

[0111] The imaging lens system 1000 may further include an aperture ST, an optical filter IF, a cover glass CG, and an imaging plane IP. The aperture ST may be disposed between the fourth lens 1040 and the fifth lens 1050, and the optical filter IF and the cover glass CG may be disposed between the seventh lens 1070 and the imaging plane IP. The imaging plane IP may be formed at a location where light incident through the first lens 1010 to the seventh lens 1070 is focused. For example, the imaging plane IP may be formed on a surface of the image sensor IS of the camera module or within the image sensor IS.

[0112] Tables 19 and 20 below list the lens properties and aspheric values ​​of the tenth embodiment of the imaging lens system. Table 19 Surface number Components Radius of curvature Thickness / distance Refractive index Abbe number Effective radius S1 First lens 24.7568 0.6000 1.501 80.8 5.427 S2 4.1322 4.5937 3.708 S3 Second lens -4.6651 1.9139 1.907 25.8 3.174 S4 -13.2240 0.6103 3.337 S5 The third lens 7.0710 1.7364 1.774 24.8 3.590 S6 -32.4107 0.2951 3.465 S7 Fourth lens -15.9122 1.6996 1.499 81.6 3.459 S8 -9.0263 0.0000 3.255 S9 aperture infinity 0.3000 2.965 S10 Fifth lens 9.4940 2.7559 1.661 52.4 3.120 S11 Sixth lens -4.0538 0.6000 1.786 24.4 3.095 S12 9.8804 0.4411 3.233 S13 Seventh lens 12.2028 1.7283 1.889 40.8 3.475 S14 -16.8499 2.7218 3.414 S15 filter infinity 0.4000 1.519 64.2 3.577 S16 infinity 0.5500 3.593 S17 cover glass infinity 0.4000 1.519 64.2 3.625 S18 infinity 3.1540 3.640 S19 Imaging plane infinity 0.0000 3.827 Table 20 Surface number S3 S4 S5 S6 S13 S14 k -1.40701E+00 -4.13654E+00 -2.42329E-01 -9.42803E+01 0.00000E+00 0.00000E+00 A 2.84216E-03 2.56955E-03 -5.12652E-05 -1.92022E-04 6.42895E-04 1.28000E-03 B -1.54505E-04 -4.87954E-05 2.23483E-05 4.93296E-05 3.26155E-05 3.96969E-05 C 4.27883E-06 -1.36039E-07 2.01660E-07 -3.63703E-07 5.03002E-07 2.07459E-06 D -1.18726E-07 0 0.00000E+00 0 0 0 E 0 0 0 0 0 0 F 0 0 0 0 0 0 G 0 0 0 0 0 0 H 0 0 0 0 0 0 J 0 0 0 0 0 0

[0113] Tables 21 and 22 below list the optical property values ​​and conditional expression values ​​of the first to tenth embodiments of the imaging lens system. Table 21 Optical properties First embodiment Second embodiment Third embodiment Fourth embodiment Fifth embodiment f1 -7.1256 -7.0064 -7.3336 -8.2002 -7.6772 f2 -13.8020 -15.1107 -12.4067 -10.1548 -10.9312 f3 8.8748 9.2828 8.2538 8.0920 7.7917 f4 39.9779 41.6546 36.3387 43.1035 31.6156 f5 4.7860 5.8456 5.3083 5.1727 4.8947 f6 -3.2516 -3.8834 -3.6850 -3.6060 -3.9860 f7 7.0469 7.0593 7.7607 7.2968 10.7948 TTL 24.5000 24.4973 24.4970 24.5000 24.5004 BFL 7.8769 7.8799 7.7010 7.6387 7.3664 f 4.5301 4.5625 4.5030 4.4610 4.4950 f-number 1.8718 1.8714 1.8000 1.8000 1.8000 IhD 3.3250 3.6250 3.6250 3.6250 3.6250 HFOV 82.0000 82.0000 82.0000 82.0000 81.9900 DFOV 100.9800 101.5000 100.5900 100.0000 100.4600 f56 -20.2397 -21.7682 -23.3670 -25.6419 -81.8220 Optical properties Sixth embodiment Seventh embodiment Eighth embodiment Ninth embodiment Tenth embodiment f1 -7.8477 -7.8710 -8.2002 -8.3139 -9.9994 f2 -10.8328 -10.9777 -9.9482 -9.7160 -8.8899 f3 7.7944 7.7934 7.5941 7.5498 7.6482 f4 34.3946 36.7654 37.3819 36.9288 38.6505 f5 4.8484 4.8221 4.7379 4.7143 4.6783 f6 -3.8274 -3.7022 -3.6184 -3.6359 -3.5872 f7 10.0307 9.2510 8.9224 8.9317 8.1930 TTL 24.5000 24.5000 24.5000 24.5000 24.5000 BFL 7.5714 7.5242 7.5283 7.5127 7.2258 f 4.4764 4.4741 4.4642 4.4856 4.5171 f-number 1.8122 1.7800 1.7690 1.7690 1.6944 IhD 3.6250 3.6250 3.6250 3.6250 3.6250 HFOV 82.0000 82.0000 82.0000 82.0000 82.0000 DFOV 94.6600 100.2000 100.0700 100.3600 94.9900 f56 -47.3826 -36.3797 -35.7203 -37.8010 -36.8699 Table 22 Conditional Expressions First embodiment Second embodiment Third embodiment Fourth embodiment Fifth embodiment ImgH / TTL 0.13571 0.14798 0.14798 0.14796 0.14796 TTL / f 5.40827 5.36928 5.44015 5.49204 5.45059 |f / f3| 0.51045 0.49150 0.54557 0.55128 0.57690 L1ER1 / TTL 0.38303 0.38433 0.39097 0.40589 0.29818 f2 / f3 -1.55520 -1.62781 -1.50315 -1.25491 -1.40293 f5 / f6 -1.47189 -1.50527 -1.44053 -1.43445 -1.22796 L1ER1 / ImgH 2.82233 2.59726 2.64212 2.74327 2.01531 |V5-V6| 32.46100 33.68000 31.72500 32.29300 30.52800 D34 / D12 0.03851 0.12972 0.10539 0.13332 0.13076 D34 / D45 0.63547 2.09163 1.80316 2.27265 2.16562 ImgH / f 0.73398 0.79452 0.80502 0.81260 0.80645 SumNd / 7 1.66210 1.64237 1.68099 1.71420 1.70767 SumV / SumNd 26.72196 28.48703 26.44418 25.69645 25.61952 (R6+R7) / (R6-R7) 4.87355 4.29882 5.13149 4.65969 3.16039 (R8+R9) / (R8-R9) 0.20760 0.16800 0.06893 0.11547 0.05305 L1ER1 / HFOV 0.11444 0.11482 0.11680 0.12127 0.08910 Conditional Expressions Sixth embodiment Seventh embodiment Eighth embodiment Ninth embodiment Tenth embodiment ImgH / TTL 0.14796 0.14796 0.14796 0.14796 0.14796 TTL / f 5.47315 5.47596 5.48811 5.46193 5.42383 |f / f3| 0.57431 0.57409 0.58785 0.59414 0.59061 L1ER1 / TTL 0.39964 0.39955 0.40314 0.40778 0.44306 f2 / f3 -1.38981 -1.40858 -1.31000 -1.28692 -1.16236 f5 / f6 -1.26676 -1.30249 -1.30940 -1.29658 -1.30417 L1ER1 / ImgH 2.70104 2.70043 2.72466 2.75601 2.99445 |V5-V6| 30.20800 29.55700 29.08700 28.64300 27.93200 D34 / D12 0.13016 0.10458 0.10272 0.09346 0.06424 D34 / D45 2.12745 1.65597 1.62615 1.44277 0.98367 ImgH / f 0.80980 0.81022 0.81202 0.80814 0.80251 SumNd / 7 1.70374 1.70603 1.72994 1.72874 1.71664 SumV / SumNd 25.68672 26.59334 25.93273 25.89718 27.51017 (R6+R7) / (R6-R7) 3.52513 3.73940 3.78700 3.83079 2.92893 (R8+R9) / (R8-R9) 0.02325 -0.00566 0.00430 -0.00333 -0.02526 L1ER1 / HFOV 0.11941 0.11938 0.12045 0.12184 0.13238

[0114] The embodiments described above can provide an imaging lens system that can provide a small f-number and high resolution without excessively increasing the size of the lens.

[0115] Although this disclosure includes specific examples, it will be apparent after understanding the disclosure of this application that various changes in form and details can be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be considered merely illustrative and not limiting. The description of features or aspects in each example is to be considered applicable to similar features or aspects in other examples. Suitable results can be achieved if the described techniques are performed in a different order and / or if components of the described systems, architectures, devices, or circuits are combined in a different manner and / or replaced or supplemented with other components or their equivalents. Therefore, the scope of the present disclosure is defined not by the detailed description but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are to be construed as included in this disclosure.

[0116] 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000: Imaging lens system 110, 210, 310, 410, 510, 610, 710, 810, 910, 1010: first lens 120, 220, 320, 420, 520, 620, 720, 820, 920, 1020: Second lens 130, 230, 330, 430, 530, 630, 730, 830, 930, 1030: third lens 140, 240, 340, 440, 540, 640, 740, 840, 940, 1040: fourth lens 150, 250, 350, 450, 550, 650, 750, 850, 950, 1050: Fifth lens 160, 260, 360, 460, 560, 660, 760, 860, 960, 1060: Sixth lens 170, 270, 370, 470, 570, 670, 770, 870, 970, 1070: Seventh lens CG: Cover glass IF:Filter IP: Imaging Plane IS: Image sensor ST: Aperture

Claims

1. An imaging lens system, comprising: The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in ascending numerical order along the optical axis of the imaging lens system from the object side of the imaging lens system toward the image plane of the imaging lens system, wherein the third lens has a convex image-side surface in its paraxial region, the fourth lens has a concave object-side surface in its paraxial region, 1.6<f-number<1.9, 0.7<ImgH / f<1.0, and f5 / f6<0, where ImgH is the maximum effective image height on the image plane, f is the focal length of the imaging lens system, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.

2. The imaging lens system as claimed in claim 1, wherein the first lens has a convex object-side surface in its paraxial region.

3. The imaging lens system as claimed in claim 1, wherein the first lens has a concave image-side surface in its paraxial region.

4. The imaging lens system as claimed in claim 1, wherein the third lens has a convex object-side surface in its paraxial region.

5. The imaging lens system as claimed in claim 1, wherein the fifth lens has a convex image-side surface in its paraxial region.

6. The imaging lens system as claimed in claim 1, wherein the sixth lens has a concave image-side surface in its paraxial region.

7. The imaging lens system as claimed in claim 1, wherein the seventh lens has a convex object-side surface in its paraxial region.

8. An imaging lens system, comprising: The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in ascending numerical order along the optical axis of the imaging lens system from the object side of the imaging lens system toward the image plane of the imaging lens system, wherein the fourth lens has a convex image-side surface in its paraxial region, the sixth lens has a concave image-side surface in its paraxial region, 1.6<f-number<1.9, 0.7<ImgH / f<1.0, and f5 / f6<0, where ImgH is the maximum effective image height on the image plane, f is the focal length of the imaging lens system, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.

9. The imaging lens system as claimed in claim 8, wherein the first lens has a convex object-side surface in its paraxial region.

10. The imaging lens system as claimed in claim 8, wherein the first lens has a concave image-side surface in its paraxial region.

11. The imaging lens system as claimed in claim 8, wherein the third lens has a convex object-side surface in its paraxial region.

12. The imaging lens system as claimed in claim 8, wherein the fifth lens has a convex object-side surface in its paraxial region.

Images