Imaging lens system

Abstract

The 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 sequentially arranged in an ascending order from an object side of the imaging lens system toward an imaging surface of the imaging lens system along an optical axis of the imaging lens system, in which the imaging lens system satisfies a conditional expression 0.13 lt; an IMG HT / TTLlt; 0.16 and 5.3 lt, 0.16 and 5.3 lt; tTL / flt; iMG HT is the maximum effective image height on the imaging plane, TTL is the distance from the object side of the first lens to the imaging plane along the optical axis, and f is the focal length of the imaging lens system.

Description

[0001] Cross - reference to related applications

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

[0003] This application relates to an imaging lens system installable on a rear camera of a vehicle and a camera for an autonomous vehicle. Background Art

[0004] Recently produced vehicles may include cameras designed to reduce damage to persons and property caused by traffic accidents. For example, one or more cameras may be installed on the front and rear bumpers of a vehicle to provide a driver with information about objects located on the front and rear sides of the vehicle. Since it is important for a vehicle camera to recognize objects around the vehicle and provide the recognized information to the driver, the vehicle camera may require high - resolution performance. However, due to limitations in the installation space, it may be difficult for a vehicle camera to achieve high resolution. For example, in order to implement a vehicle camera with a small f - number (i.e., a large aperture), it may be necessary to increase the diameters of the front lens and other lenses, but due to structural and design limitations of vehicle components (e.g., bumpers) in which the camera is installed, it may be difficult to arbitrarily change the size of the lens. Summary of the Invention

[0005] The Summary of the Invention section is intended to introduce, in a brief form, a selection of inventive concepts, which will be further described in the Detailed Description section below. The Summary of the Invention section is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to assist 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 sequentially arranged in ascending order along an optical axis of the imaging lens system from an object side of the imaging lens system toward an imaging surface of the imaging lens system, where the imaging lens system satisfies the conditional expressions 0.13 < IMG HT / TTL < 0.16 and 5.3 < TTL / f < 5.5, where IMG HT is the maximum effective image height on the imaging surface, TTL is the distance along the optical axis from the object surface of the first lens to the imaging surface, and f is the focal length of the imaging lens system.

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

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

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

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

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

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

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

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

[0015] In another general aspect, the imaging lens system includes a first lens having a negative refractive power; a second lens having a negative refractive power; a third lens having a refractive power; a fourth lens having a refractive power; a fifth lens having a refractive power; a sixth lens having a refractive power; and a seventh lens having a refractive power, wherein the first lens to the seventh lens are sequentially arranged in ascending order along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system, and the imaging lens system satisfies the conditional expression 5.3 < TTL / f < 5.5, where TTL is the distance along the optical axis from the object side surface of the first lens to the imaging surface; 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 may have an image side surface with an inflection point.

[0018] The imaging lens system may satisfy the conditional expression 0.03 < D34 / D12 < 0.20, where 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, and 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.

[0019] The imaging lens system may satisfy the conditional expression 0.60 < D34 / D45 < 3.0, where 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, and 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.

[0020] The imaging lens system may satisfy the conditional expression 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 can satisfy the conditional expression -0.10<(R8+R9) / (R8-R9)<0.3, where R8 is the curvature radius of the image side surface of the fourth lens at the optical axis, and R9 is the curvature radius of the object side surface of the fifth lens at the optical axis.

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

[0023] Figure 1 2 is a diagram showing a first embodiment of an imaging lens system.

[0024] Figure 2 yes Figure 1 Aberration curves of the imaging lens system shown.

[0025] Figure 3 2 is a diagram showing a second embodiment of an imaging lens system.

[0026] Figure 4 yes Figure 3 Aberration curves of the imaging lens system shown.

[0027] Figure 5 2 is a diagram showing a third embodiment of an imaging lens system.

[0028] Figure 6 yes Figure 5 Aberration curves of the imaging lens system shown.

[0029] Figure 7 2 is a diagram showing a fourth embodiment of an imaging lens system.

[0030] Figure 8 yes Figure 7 Aberration curves of the imaging lens system shown.

[0031] Fig. 9 2 is a diagram showing a fifth embodiment of an imaging lens system.

[0032] Fig.10 yes Fig. 9 Aberration curves of the imaging lens system shown.

[0033] Fig.11 2 is a diagram showing a sixth embodiment of an imaging lens system.

[0034] Fig.12 yes Fig.11 Aberration curves of the imaging lens system shown.

[0035] Fig.13 2 is a diagram showing a seventh embodiment of an imaging lens system.

[0036] Fig.14 yes Fig.13 Aberration curves of the imaging lens system shown.

[0037] Fig.15 2 is a diagram showing an eighth embodiment of an imaging lens system.

[0038] Fig.16 yes Fig.15 Aberration curves of the imaging lens system shown.

[0039] Fig.17 2 is a diagram showing a ninth embodiment of an imaging lens system.

[0040] Fig.18 yes Fig.17 Aberration curves of the imaging lens system shown.

[0041] Fig.19 2 is a diagram showing a tenth embodiment of an imaging lens system.

[0042] Fig. 20 yes Fig.19 Aberration curves of the imaging lens system shown.

[0043] Throughout the drawings and detailed description, the same reference numerals refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative sizes, proportions, and depictions of elements in the drawings may be exaggerated. DETAILED DESCRIPTION

[0044] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalences of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and except for the operations that must occur in a particular order, it is not limited to the order set forth herein, but can be changed as will be apparent after understanding the disclosure of the present application. In addition, for greater clarity and brevity, the description of features known in the art may be omitted.

[0045] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0046] Use of the word "may" when describing various examples herein (eg, with respect to what an example may include or implement) means that there is at least one example that includes or implements such a feature, but not all examples are limited thereto.

[0047] Throughout the specification, when an element such as a layer, a region, or a substrate is described as being “on,” “connected to,” or “coupled to” another element, the element may be directly “on,” “connected to,” or “coupled to” the other element, or one or more other elements may be present between the element and the other element. Conversely, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, no other elements may be present between the element and the other element.

[0048] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0049] Although terms such as "first", "second" and "third" may be used herein to describe various members, components, regions, layers or portions, these members, components, regions, layers or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer or portion from another member, component, region, layer or portion. Therefore, without departing from the teachings of the examples described herein, the first member, first component, first region, first layer or first portion mentioned in these examples may also be referred to as the second member, second component, second region, second layer or second portion.

[0050] Spatially relative terms such as "above", "higher", "below", and "lower" may be used herein for descriptive convenience to describe the relationship of one element relative to another element as shown in the accompanying drawings. In addition to covering the orientations depicted in the accompanying drawings, these spatially relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the accompanying drawings is flipped, an element described as being "above" or "higher" relative to another element will be "below" or "lower" relative to the other element. Therefore, depending on the spatial orientation of the device, the term "above" covers both orientations of "above" and "below". The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.

[0051] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the articles "a", "an" and "the" are intended to include plural forms as well. The words "include", "comprise" and "have" indicate the presence of the features, numbers, operations, components, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, numbers, operations, components, elements and / or combinations thereof.

[0052] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0053] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have multiple configurations, other configurations that will be apparent after understanding the disclosure of the present application are also feasible.

[0054] In the drawings, the thickness, size and shape of the lens may be slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical surface or aspherical surface shown in the drawings are shown by way of example. That is, the shapes of the spherical surface or aspherical surface are not limited to those shown in the drawings.

[0055] In the embodiments described herein, the first lens refers to a lens closest to an object (or subject), and the seventh lens refers to a lens closest to an imaging plane (or image sensor).

[0056] The units of the radius of curvature 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 to the imaging plane), BFL (the distance from the image side surface of the seventh lens to the imaging plane), IMG HT (the maximum effective image height on 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 are expressed in millimeters (mm).

[0057] The thickness of lenses and other optical elements, the gaps between lenses and other optical elements, TTL and 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.

[0058] Unless otherwise specified, the shape of the lens surface refers to the shape of the paraxial region of the lens surface. The paraxial region of the lens surface is the central portion of the lens surface that surrounds and includes the optical axis of the lens surface, in which the light incident on the lens surface forms a small angle θ with the optical axis, and the approximations of sinθ≈θ, tanθ≈θ, and cosθ≈1 are valid.

[0059] For example, the statement that the object side of the lens is convex means that at least the paraxial region of the object side of the lens is convex, and the statement that the image side of the lens is concave means that at least the paraxial region of the image side of the lens is concave. Thus, even if the object side of the lens can be described as convex, the entire object side of the lens may not be convex, and the outer peripheral region of the object side of the lens may be concave. In addition, even if the image side of the lens can be described as concave, the entire image side of the lens may not be concave, and the outer peripheral region of the image side of the lens may be convex.

[0060] The effective semi-aperture or effective radius of the 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 semi-aperture or effective radius of the lens surface is the distance between the optical axis and the marginal ray of the light passing through the lens surface in a direction perpendicular to the optical axis of the lens surface. The object side of the lens and the image side of the lens may have different effective semi-apertures or effective radii.

[0061] The imaging lens system of the embodiments described herein can be configured to be mounted on a transportation device. For example, the imaging lens system can be provided on a front and rear surveillance camera or an autonomous driving camera mounted on a passenger car, a truck, a fire truck, a forklift, or other transportation 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 of a reconnaissance drone or a transportation drone.

[0062] 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 that are sequentially arranged in ascending order along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system.

[0063] The imaging lens system in the first embodiment can satisfy a specific conditional expression. For example, the imaging lens system in the first embodiment can satisfy the conditional expression: 0.13 <IMG HT / TTL < 0.16, where IMG HT is the maximum effective image height on the imaging surface, and TTL is the distance along the optical axis from the object side of the first lens to the imaging surface.

[0064] As another example, the imaging lens system in the first embodiment can 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.

[0065] 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 that are sequentially arranged in ascending order from the object side to the imaging surface of the imaging lens system along the optical axis of the imaging lens system.

[0066] 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.

[0067] The imaging lens system in the third embodiment may be configured to satisfy one or more of the conditional expressions listed below. For example, the imaging lens system in the third embodiment may include seven lenses and may satisfy two or more of the conditional expressions listed below. As another example, the imaging lens system in the third embodiment may include seven lenses and may be configured to satisfy all of the conditional expressions listed below.

[0068] 0.13 < IMG HT / TTL < 0.16 (Conditional Expression 1)

[0069] 5.3 < TTL / f < 5.5 (Conditional Expression 2)

[0070] 0.49 ≤ |f / f3| < 0.6 (Conditional Expression 3)

[0071] L1ED1 / TTL < 0.5 (Conditional Expression 4)

[0072] f2 / f3 < 0 (Conditional Expression 5)

[0073] f5 / f6 < 0 (Conditional Expression 6)

[0074] L1ED1 / IMG HT < 3.0 (Conditional Expression 7)

[0075] 25 < |V5 - V6| (Conditional Expression 8)

[0076] f56 < 0 (Conditional Expression 9)

[0077] 80° < HFOV < 90° (Conditional Expression 10)

[0078] 94° < DFOV < 104° (Conditional Expression 11)

[0079] In the conditional expressions listed above, IMG HT is the maximum effective image height on the imaging surface, TTL is the distance along the optical axis from the object side surface of the first lens to the imaging surface, 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, L1ED1 is the effective diameter 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 surface in the horizontal direction expressed in degrees, and DFOV is the field of view of the imaging surface in the diagonal direction expressed in degrees.

[0080] The imaging lens system in the third embodiment can satisfy some of the conditional expressions listed above in a more limited manner as listed below:

[0081] 0.26 < L1ED1 / TTL < 0.46 (Conditional Expression 12)

[0082] -2.0 < f2 / f3 < -1.0 (Conditional Expression 13)

[0083] -1.6 < f5 / f6 < -1.2 (Conditional Expression 14)

[0084] 2.0 < L1ED1 / IMG HT < 3.0 (Conditional Expression 15)

[0085] -100 < f56 < -18 (Conditional Expression 16)

[0086] The imaging lens system in the fourth embodiment can be configured to satisfy one or more of the conditional expressions listed below. For example, the imaging lens system in the fourth embodiment can include seven lenses and can satisfy two or more of the conditional expressions listed below. As another example, the imaging lens system in the fourth embodiment can include seven lenses and can be configured to satisfy all of the conditional expressions listed below:

[0087] 1.6 < f-number < 1.9 (Conditional Expression 17)

[0088] 0.7 < IMG HT / f < 1.0 (Conditional Expression 18)

[0089] 0.03 < D34 / D12 < 0.20 (Conditional Expression 19)

[0090] 0.60 < D34 / D45 < 3.0 (Conditional Expression 20)

[0091] 1.64 < SumNd / 7 < 1.76 (Conditional Expression 21)

[0092] 24 < SumV / SumNd < 29 (Conditional Expression 22)

[0093] 2.8 < (R6 + R7) / (R6 - R7) < 5.8 (Conditional Expression 23)

[0094] -0.10 < (R8 + R9) / (R8 - R9) < 0.3 (Conditional Expression 24)

[0095] 0.08 mm / ° < L1ED1 / HFOV < 0.140 mm / ° (Conditional Expression 25)

[0096] 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 lens to the seventh lens, SumNd is the sum of the refractive indices of the first lens to the seventh 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, and R9 is the radius of curvature of the object side surface of the fifth lens.

[0097] The imaging lens system in the embodiment may include one or more lenses having the characteristics described below. For example, the imaging lens system in the first embodiment may include one of the first lens to the seventh lens having the characteristics described below. As another example, the imaging lens systems in the second to fourth embodiments may include one or more of the first lens to the seventh lens having the characteristics described below. However, the imaging lens systems in the foregoing embodiments do not necessarily include lenses having the characteristics described below. Hereinafter, the first lens to the seventh lens will be described.

[0098] 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 transmittance and excellent processability. 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 more. For example, the Abbe number of the first lens may be greater than 40 and less than 82.

[0099] The second lens may have a refractive power. For example, the second lens may have a 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 processability. 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.

[0100] The third lens may have a refractive power. For example, the third lens may have a 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 of a material having high light transmittance and excellent processability. For example, the third lens may be formed of 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.

[0101] The fourth lens may have a refractive power. For example, the fourth lens may have a 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 of a material having high light transmittance and excellent processability. For example, the fourth lens may be formed of 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.

[0102] The fifth lens may have a refractive power. For example, the fifth lens may have a 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 processability. 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.

[0103] The sixth lens may have a refractive power. For example, the sixth lens may have a 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 of a material having high light transmittance and excellent processability. For example, the sixth lens may be formed of 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.

[0104] The seventh lens may have a refractive power. For example, the seventh lens may have a 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 processability. 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.

[0105] The first to seventh lenses may include a spherical surface or an aspherical surface as described above.

[0106] The aspherical surface of the lens can be expressed by the following Equation 1.

[0107]

[0108]

[0109] 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 a 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 sagittal) is the distance from a point on the lens surface at a distance r from the optical axis of the lens surface to a tangent plane perpendicular to the optical axis and intersecting the vertex of the lens surface in a direction parallel to the optical axis of the lens surface.

[0110] The imaging lens system in the above-mentioned embodiment may further include an aperture, a filter, and a cover glass. As an example, the imaging lens system may further include an aperture disposed between the fourth lens and the fifth lens. As another example, the imaging lens system may further include an optical filter and a cover glass disposed between the seventh lens and the imaging plane. The aperture may be configured to adjust the amount of light incident on the imaging plane. The filter may be configured to block light of a specific wavelength or a specific wavelength range, and the cover glass may be configured to block foreign matter from reaching the imaging plane. As an example, the filter may be configured to block infrared light, but may be additionally or alternatively configured to block ultraviolet light.

[0111] Figure 1 is a diagram showing a first embodiment of an imaging lens system, and Figure 2 yes Figure 1 Aberration curves of the imaging lens system shown.

[0112] Reference Figure 1 , the imaging lens system 100 may include a first lens 110 , a second lens 120 , a third lens 130 , a fourth lens 140 , a fifth lens 150 , a sixth lens 160 and a seventh lens 170 .

[0113] The first lens 110 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The second lens 120 may have a negative refractive power and may have a concave object side surface and a convex image side surface. The third lens 130 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The fourth lens 140 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The fifth lens 150 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The sixth lens 160 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The seventh lens 170 may have a 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. In more detail, the curvature radius of the image side surface of the fifth lens 150 and the curvature radius 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 contact the object side surface of the sixth lens 160 at the center of the optical axis.

[0114] The imaging lens system 100 may further include a stop ST, a filter IF, a cover glass CG, and an imaging surface IP. The stop ST may be disposed between the fourth lens 140 and the fifth lens 150, and the filter IF and the cover glass CG may be disposed between the seventh lens 170 and the imaging surface IP. The imaging surface IP may be formed at a position where light incident through the first lens 110 to the seventh lens 170 is focused. For example, the imaging surface IP may be formed on one surface of the image sensor IS of the camera module or formed within the image sensor IS.

[0115] Table 1 and Table 2 below list lens characteristics and aspheric surface values ​​of the first embodiment of the imaging lens system.

[0116] Table 1

[0117]

[0118] Table 2

[0119]

[0120] Figure 3 is a diagram showing a second embodiment of an imaging lens system, and Figure 4 yes Figure 3 Aberration curves of the imaging lens system shown.

[0121] Reference Figure 3 , the imaging lens system 200 may include a first lens 210 , a second lens 220 , a third lens 230 , a fourth lens 240 , a fifth lens 250 , a sixth lens 260 and a seventh lens 270 .

[0122] The first lens 210 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The second lens 220 may have a negative refractive power and may have a concave object side surface and a convex image side surface. The third lens 230 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The fourth lens 240 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The fifth lens 250 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The sixth lens 260 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The seventh lens 270 may have a 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 270. The fifth lens 250 and the sixth lens 260 may be combined with each other. In more detail, the curvature radius of the image side surface of the fifth lens 250 and the curvature radius 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 contact the object side surface of the sixth lens 260 at the center of the optical axis.

[0123] The imaging lens system 200 may further include a stop ST, a filter IF, a cover glass CG, and an imaging surface IP. The stop ST may be disposed between the fourth lens 240 and the fifth lens 250, and the filter IF and the cover glass CG may be disposed between the seventh lens 270 and the imaging surface IP. The imaging surface IP may be formed at a position where light incident through the first lens 210 to the seventh lens 270 is focused. For example, the imaging surface IP may be formed on one surface of the image sensor IS of the camera module or formed within the image sensor IS.

[0124] Table 3 and Table 4 below list lens characteristics and aspherical surface values ​​of the second embodiment of the imaging lens system.

[0125] Table 3

[0126]

[0127] Table 4

[0128]

[0129]

[0130] Figure 5 is a diagram showing a third embodiment of an imaging lens system, and Figure 6 yes Figure 5 Aberration curves of the imaging lens system shown.

[0131] Reference Figure 5 , the imaging lens system 300 may include a first lens 310 , a second lens 320 , a third lens 330 , a fourth lens 340 , a fifth lens 350 , a sixth lens 360 and a seventh lens 370 .

[0132] The first lens 310 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The second lens 320 may have a negative refractive power and may have a concave object side surface and a convex image side surface. The third lens 330 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The fourth lens 340 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The fifth lens 350 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The sixth lens 360 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The seventh lens 370 may have a 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 370. The fifth lens 350 and the sixth lens 360 may be combined with each other. In more detail, the curvature radius of the image side surface of the fifth lens 350 and the curvature radius 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 contact the object side surface of the sixth lens 360 at the center of the optical axis.

[0133] The imaging lens system 300 may further include a stop ST, a filter IF, a cover glass CG, and an imaging surface IP. The stop ST may be disposed between the fourth lens 340 and the fifth lens 350, and the filter IF and the cover glass CG may be disposed between the seventh lens 370 and the imaging surface IP. The imaging surface IP may be formed at a position where light incident through the first lens 310 to the seventh lens 370 is focused. For example, the imaging surface IP may be formed on one surface of the image sensor IS of the camera module or formed within the image sensor IS.

[0134] Table 5 and Table 6 below list lens characteristics and aspherical surface values ​​of the third embodiment of the imaging lens system.

[0135] Table 5

[0136]

[0137] Table 6

[0138] Face 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

[0139] Figure 7 is a diagram showing a fourth embodiment of an imaging lens system, and Figure 8 yes Figure 7 Aberration curves of the imaging lens system shown.

[0140] Reference Figure 7 , the imaging lens system 400 may include a first lens 410 , a second lens 420 , a third lens 430 , a fourth lens 440 , a fifth lens 450 , a sixth lens 460 and a seventh lens 470 .

[0141] The first lens 410 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The second lens 420 may have a negative refractive power and may have a concave object side surface and a convex image side surface. The third lens 430 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The fourth lens 440 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The fifth lens 450 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The sixth lens 460 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The seventh lens 470 may have a 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 470. The fifth lens 450 and the sixth lens 460 may be combined with each other. In more detail, the curvature radius of the image side surface of the fifth lens 450 and the curvature radius 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 contact the object side surface of the sixth lens 460 at the center of the optical axis.

[0142] The imaging lens system 400 may further include a stop ST, a filter IF, a cover glass CG, and an imaging surface IP. The stop ST may be disposed between the fourth lens 440 and the fifth lens 450, and the filter IF and the cover glass CG may be disposed between the seventh lens 470 and the imaging surface IP. The imaging surface IP may be formed at a position where light incident through the first lens 410 to the seventh lens 470 is focused. For example, the imaging surface IP may be formed on one surface of the image sensor IS of the camera module or within the image sensor IS.

[0143] Table 7 and Table 8 below list lens characteristics and aspherical surface values ​​of the fourth embodiment of the imaging lens system.

[0144] Table 7

[0145]

[0146]

[0147] Table 8

[0148] Face 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

[0149] Fig. 9 is a diagram showing a fifth embodiment of an imaging lens system, and Fig.10 yes Fig. 9 Aberration curves of the imaging lens system shown.

[0150] Reference Fig. 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 .

[0151] The first lens 510 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The second lens 520 may have a negative refractive power and may have a concave object side surface and a convex image side surface. The third lens 530 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The fourth lens 540 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The fifth lens 550 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The sixth lens 560 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The seventh lens 570 may have a 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 570. The fifth lens 550 and the sixth lens 560 may be combined with each other. In more detail, the curvature radius of the image side surface of the fifth lens 550 and the curvature radius of the object side surface of the sixth lens 560 may be configured to be substantially the same, and the image side surface of the fifth lens 550 may contact the object side surface of the sixth lens 560 at the center of the optical axis.

[0152] The imaging lens system 500 may further include a stop ST, a filter IF, a cover glass CG, and an imaging surface IP. The stop ST may be disposed between the fourth lens 540 and the fifth lens 550, and the filter IF and the cover glass CG may be disposed between the seventh lens 570 and the imaging surface IP. The imaging surface IP may be formed at a position where light incident through the first lens 510 to the seventh lens 570 is focused. For example, the imaging surface IP may be formed on one surface of the image sensor IS of the camera module or formed within the image sensor IS.

[0153] Table 9 and Table 10 below list the lens characteristics and aspherical surface values ​​of the fifth embodiment of the imaging lens system.

[0154] Table 9

[0155]

[0156]

[0157] Table 10

[0158] Face 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

[0159] Fig.11 is a diagram showing a sixth embodiment of an imaging lens system, and Fig.12 yes Fig.11 Aberration curves of the imaging lens system shown.

[0160] Reference Fig.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 .

[0161] The first lens 610 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The second lens 620 may have a negative refractive power and may have a concave object side surface and a convex image side surface. The third lens 630 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The fourth lens 640 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The fifth lens 650 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The sixth lens 660 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The seventh lens 670 may have a 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 670. The fifth lens 650 and the sixth lens 660 may be combined with each other. In more detail, the curvature radius of the image side surface of the fifth lens 650 and the curvature radius 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 contact the object side surface of the sixth lens 660 at the center of the optical axis.

[0162] The imaging lens system 600 may further include a stop ST, a filter IF, a cover glass CG, and an imaging surface IP. The stop ST may be disposed between the fourth lens 640 and the fifth lens 650, and the filter IF and the cover glass CG may be disposed between the seventh lens 670 and the imaging surface IP. The imaging surface IP may be formed at a position where light incident through the first lens 610 to the seventh lens 670 is focused. For example, the imaging surface IP may be formed on one surface of the image sensor IS of the camera module or formed within the image sensor IS.

[0163] Table 11 and Table 12 below list lens characteristics and aspherical surface values ​​of the sixth embodiment of the imaging lens system.

[0164] Table 11

[0165]

[0166] Table 12

[0167]

[0168] Fig.13 is a diagram showing a seventh embodiment of an imaging lens system, and Fig.14 yes Fig.13 Aberration curves of the imaging lens system shown.

[0169] Reference Fig.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 .

[0170] 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 curvature radius of the image side surface of the fifth lens 750 and the curvature radius of the object side surface of the sixth lens 760 may be configured to be substantially the same, and the image side surface of the fifth lens 750 may contact the object side surface of the sixth lens 760 at the center of the optical axis.

[0171] The imaging lens system 700 may further include a stop ST, a filter IF, a cover glass CG, and an imaging surface IP. The stop ST may be disposed between the fourth lens 740 and the fifth lens 750, and the filter IF and the cover glass CG may be disposed between the seventh lens 770 and the imaging surface IP. The imaging surface IP may be formed at a position where light incident through the first lens 710 to the seventh lens 770 is focused. For example, the imaging surface IP may be formed on one surface of the image sensor IS of the camera module or formed within the image sensor IS.

[0172] Table 13 and Table 14 below list lens characteristics and aspherical surface values ​​of the seventh embodiment of the imaging lens system.

[0173] Table 13

[0174]

[0175] Table 14

[0176]

[0177]

[0178] Fig.15 is a diagram showing an eighth embodiment of an imaging lens system, and Fig.16 yes Fig.15 Aberration curves of the imaging lens system shown.

[0179] Reference Fig.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 .

[0180] The first lens 810 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The second lens 820 may have a negative refractive power and may have a concave object side surface and a convex image side surface. The third lens 830 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The fourth lens 840 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The fifth lens 850 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The sixth lens 860 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The seventh lens 870 may have a 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 870. The fifth lens 850 and the sixth lens 860 may be combined with each other. In more detail, the curvature radius of the image side surface of the fifth lens 850 and the curvature radius of the object side surface of the sixth lens 860 may be configured to be substantially the same, and the image side surface of the fifth lens 850 may contact the object side surface of the sixth lens 860 at the center of the optical axis.

[0181] The imaging lens system 800 may further include a stop ST, a filter IF, a cover glass CG, and an imaging surface IP. The stop ST may be disposed between the fourth lens 840 and the fifth lens 850, and the filter IF and the cover glass CG may be disposed between the seventh lens 870 and the imaging surface IP. The imaging surface IP may be formed at a position where light incident through the first lens 810 to the seventh lens 870 is focused. For example, the imaging surface IP may be formed on one surface of the image sensor IS of the camera module or within the image sensor IS.

[0182] Table 15 and Table 16 below list lens characteristics and aspherical surface values ​​of the eighth embodiment of the imaging lens system.

[0183] Table 15

[0184]

[0185] Table 16

[0186] Face 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 -1.53185E-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

[0187] Fig.17 is a diagram showing a ninth embodiment of an imaging lens system, and Fig.18 yes Fig.17 Aberration curves of the imaging lens system shown.

[0188] Reference Fig.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 .

[0189] The first lens 910 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The second lens 920 may have a negative refractive power and may have a concave object side surface and a convex image side surface. The third lens 930 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The fourth lens 940 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The fifth lens 950 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The sixth lens 960 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The seventh lens 970 may have a 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 970. The fifth lens 950 and the sixth lens 960 may be combined with each other. In more detail, the curvature radius of the image side surface of the fifth lens 950 and the curvature radius 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 contact the object side surface of the sixth lens 960 at the center of the optical axis.

[0190] The imaging lens system 900 may further include a stop ST, a filter IF, a cover glass CG, and an imaging surface IP. The stop ST may be disposed between the fourth lens 940 and the fifth lens 950, and the filter IF and the cover glass CG may be disposed between the seventh lens 970 and the imaging surface IP. The imaging surface IP may be formed at a position where light incident through the first lens 910 to the seventh lens 970 is focused. For example, the imaging surface IP may be formed on one surface of the image sensor IS of the camera module or formed within the image sensor IS.

[0191] Table 17 and Table 18 below list the lens characteristics and aspherical surface values ​​of the ninth embodiment of the imaging lens system.

[0192] Table 17

[0193]

[0194]

[0195] Table 18

[0196] Face 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

[0197] Fig.19 is a diagram showing a tenth embodiment of an imaging lens system, and Fig. 20 yes Fig.19 Aberration curves of the imaging lens system shown.

[0198] Reference Fig.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 .

[0199] 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. In more detail, the curvature radius of the image-side surface of the fifth lens 1050 and the curvature radius 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 contact the object-side surface of the sixth lens 1060 at the center of the optical axis.

[0200] The imaging lens system 1000 may further include a stop ST, a filter IF, a cover glass CG, and an imaging surface IP. The stop ST may be disposed between the fourth lens 1040 and the fifth lens 1050, and the filter IF and the cover glass CG may be disposed between the seventh lens 1070 and the imaging surface IP. The imaging surface IP may be formed at a position where light incident through the first lens 1010 to the seventh lens 1070 is focused. For example, the imaging surface IP may be formed on one surface of the image sensor IS of the camera module or formed within the image sensor IS.

[0201] Table 19 and Table 20 below list the lens characteristics and aspherical surface values ​​of the tenth embodiment of the imaging lens system.

[0202] Table 19

[0203]

[0204]

[0205] Table 20

[0206] Face 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

[0207] Table 21 and Table 22 below list optical characteristic values ​​and conditional expression values ​​of the first to tenth embodiments of the imaging lens system.

[0208] Table 21

[0209]

[0210]

[0211] Table 22

[0212]

[0213]

[0214] The above-described embodiments can provide a lens system that can provide a small f-number and high-resolution imaging without excessively increasing the size of the lens.

[0215] Although the present disclosure includes specific examples, it will be apparent after understanding the disclosure of the present application that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are understood in a descriptive sense only and not for limiting purposes. The description of the features or aspects in each example should be considered to be applicable to similar features or aspects in other examples. If the described techniques are performed in a different order, and / or if the components in the described system, architecture, device or circuit are replaced or supplemented in a different manner and / or by other components or their equivalents, appropriate results can still be achieved. Therefore, the scope of the present disclosure is not limited by specific embodiments, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in the present disclosure.

Claims

1. Imaging lens system, including: A first lens element having negative refractive power; The second lens has negative refractive power; a third lens having a convex object-side surface and a convex image-side surface in a paraxial region; a fourth lens element having positive refractive power; a fifth lens having a convex object-side surface and a convex image-side surface in a paraxial region; a sixth lens having a concave object-side surface and a concave image-side surface in a paraxial region; as well as The seventh lens has a convex object-side surface and a convex image-side surface in the paraxial region, The first lens to the seventh lens are arranged in ascending order along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system. The imaging lens system includes a total of seven lenses, and Wherein, the imaging lens system satisfies the following conditional expression: 2.8<(R6+R7) / (R6-R7)<5.8 Wherein, R6 is the curvature radius of the image side surface of the third lens at the optical axis, and R7 is the curvature radius of the object side surface of the fourth lens at the optical axis.

2. The imaging lens system according to claim 1, wherein: The first lens has a convex object-side surface.

3. The imaging lens system according to claim 1, wherein: The second lens has a concave object-side surface.

4. The imaging lens system according to claim 1, wherein: The fourth lens has a concave object-side surface.

5. The imaging lens system according to claim 1, wherein: The fourth lens has a concave image-side surface.

6. Imaging lens system, comprising: A first lens element having negative refractive power; The second lens has negative refractive power; a third lens having a convex object-side surface and a convex image-side surface in a paraxial region; a fourth lens element having positive refractive power; a fifth lens having a convex object-side surface and a convex image-side surface in a paraxial region; a sixth lens having a concave object-side surface and a concave image-side surface in a paraxial region; as well as The seventh lens has a convex object-side surface and a convex image-side surface in the paraxial region, The first lens to the seventh lens are arranged in ascending order along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging surface of the imaging lens system. The imaging lens system includes a total of seven lenses, and Wherein, the imaging lens system satisfies the following conditional expression: 0.49≤|f / f3|<0.6 Wherein, f is the focal length of the imaging lens system, and f3 is the focal length of the third lens.

7. The imaging lens system according to claim 6, wherein: The first lens has a convex object-side surface.

8. The imaging lens system according to claim 6, wherein: The second lens has a concave object-side surface.

9. The imaging lens system according to claim 6, wherein: The fourth lens has a concave object-side surface.

10. The imaging lens system according to claim 6, wherein: The fourth lens has a concave image-side surface.

Images