Imaging lens system

Abstract

An imaging lens system includes: a first lens; a second lens; a third lens having a concave object-side surface in its paraxial region; a fourth lens; a fifth lens; a sixth lens; and a seventh lens, wherein the first lens to 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 imaging plane of the imaging lens system, and satisfy the conditional expression TTL / (2*ImgHT) < 0.6, where TTL is the distance along the optical axis from the object-side surface of the first lens to the imaging plane, and 2*ImgHT is the diagonal length of the effective imaging area of ​​the imaging plane.

Description

[Technical Field]

[0001] 1. Field

[0002] This application discloses an imaging lens system with a wide field of view.

[0003] Cross-reference to related applications

[0004] This application claims priority to Korean Patent Application No. 10-2021-0087917, filed on July 5, 2021, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. [Previous Technology]

[0005] 2. Description of related technologies

[0006] Portable electronic devices may include camera modules for capturing images or videos. For example, camera modules may be installed in mobile phones, laptops, gaming devices, or various other electronic devices.

[0007] The resolution of a camera module including an imaging lens system can be proportional to the size of the sensor and the imaging plane. For example, to implement a high-resolution camera module including an imaging lens system, a sensor and imaging plane of a relatively large size may be necessary. However, since the size (or length) of the camera module and imaging lens system increases proportionally to the size of the sensor and the imaging plane, it may be difficult to install a high-resolution camera module and imaging lens system in a thin electronic device such as a smartphone. [Summary of the Invention]

[0008] This summary is provided to introduce, in a simplified form, a series of concepts further elaborated in the embodiments below. This summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter.

[0009] In a general case, an imaging lens system includes: a first lens; a second lens; a third lens having a concave object-side surface in its paraxial region; a fourth lens; a fifth lens; a sixth lens; and a seventh lens, wherein the first lens to 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 imaging plane of the imaging lens system, and satisfy the conditional expression TTL / (2*ImgHT) < 0.6, where TTL is the distance along the optical axis from the object-side surface of the first lens to the imaging plane, and 2*ImgHT is the diagonal length of the effective imaging area of ​​the imaging plane.

[0010] The field of view of the imaging lens system can be 84 degrees or greater than 84 degrees.

[0011] The f-number of the imaging lens system can be less than 1.9.

[0012] The conditional expression 0.7 < TTL / f < 1.2 can be satisfied, where f is the focal length of the imaging lens system.

[0013] The condition expression 0.1 < D34 / D67 < 0.3 can be satisfied, 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 D67 is the distance along the optical axis from the image side surface of the sixth lens to the object side surface of the seventh lens.

[0014] The condition expression 0.4 < R1 / R11 < 0.8 can be satisfied, where R1 is the radius of curvature of the object-side surface of the first lens on the optical axis, and R11 is the radius of curvature of the object-side surface of the sixth lens on the optical axis.

[0015] The conditional expression -0.8 < (R11-R12) / (R11+R12) < -0.1 can be satisfied, where R11 is the radius of curvature of the object-side surface of the sixth lens on the optical axis, and R12 is the radius of curvature of the image-side surface of the sixth lens on the optical axis.

[0016] The condition expression 0.4 < (R3-R4) / (R3+R4) < 0.6 can be satisfied, where R3 is the radius of curvature of the object-side surface of the second lens on the optical axis, and R4 is the radius of curvature of the image-side surface of the second lens on the optical axis.

[0017] The condition expression 0.1 < (R12*D56) / (f*ImgHT) < 0.3 can be satisfied, where R12 is the radius of curvature of the image side surface of the sixth lens on the optical axis, D56 is the distance along the optical axis from the image side surface of the fifth lens to the object side surface of the sixth lens, f is the focal length of the imaging lens system, and ImgHT is the maximum effective image height on the imaging plane.

[0018] The conditional expression 1.0 < (V4+V5) / V3 < 2.0 can be satisfied, where V3 is the Abbe number of the third lens, V4 is the Abbe number of the fourth lens, and V5 is the Abbe number of the fifth lens.

[0019] In another general example, an imaging lens system includes: a first lens having refractive power; a second lens having refractive power; a third lens having positive refractive power and having a concave object-side surface in its paraxial region; a fourth lens having refractive power; a fifth lens having refractive power; a sixth lens having refractive power; and a seventh lens having a convex object-side surface in its paraxial region, wherein the first lens to the seventh lens are arranged sequentially along the optical axis of the imaging lens system from the object side of the imaging lens system toward the imaging plane of the imaging lens system in ascending numerical order and satisfying the conditional expression 0.7 < TTL / f < 1.2, where TTL is the distance along the optical axis from the object-side surface of the first lens to the imaging plane, and f is the focal length of the imaging lens system.

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

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

[0022] The fourth lens may have a concave image side surface in its paraxial region.

[0023] The fourth lens may have negative refractive power.

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

[0025] In another general example, 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, wherein the first lens to 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 imaging plane of the imaging lens system, and satisfy the conditional expression TTL / (2*ImgHT) < 0.6, where TTL is the distance along the optical axis from the object side surface of the first lens to the imaging plane, and 2*ImgHT is the diagonal length of the effective imaging area of ​​the imaging plane, and the imaging lens system has any one or any combination of two or more of the following characteristics: the third lens has a positive refractive power; the third lens has a convex image side surface in its paraxial region; the fourth lens has a negative refractive power; and the seventh lens has a convex object side surface in its paraxial region.

[0026] The field of view of the imaging lens system can be 84 degrees or greater than 84 degrees.

[0027] The f-number of the imaging lens system can be less than 1.9.

[0028] The conditional expression 0.7 < TTL / f < 1.2 can be satisfied, where f is the focal length of the imaging lens system.

[0029] Other features and characteristics will become apparent from reading the following detailed description, drawings and claims.

Implementation Method

[0031] The following detailed description is provided to assist the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various modifications, refinements, and equivalents of the methods, apparatus, and / or systems described herein will become apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not intended to limit the reader to the order of operations described herein, but as will become apparent after understanding the disclosure of this application, changes may be made except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in this art may be omitted.

[0032] The features described herein may be implemented in different 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, apparatus and / or systems described herein that will become apparent upon understanding the disclosure of this application.

[0033] In this document, the use of the word "may" (e.g., regarding what an instance may include or implement) when describing various instances means that there exists at least one instance that includes or implements such a feature, but not all instances are limited to this.

[0034] 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," directly "connected to," or directly "coupled to" the other element, or one or more other elements may be present in between. 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 in between.

[0035] The term "and / or" as used herein includes any one of the related listed items and any combination of any two or more.

[0036] Although terms such as "first," "second," and "third" may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited by these terms. Specifically, these terms are used only to distinguish individual components, parts, regions, layers, or sections. Therefore, without departing from the teaching of the examples, the first component, part, region, layer, or section mentioned in the examples described herein may also be referred to as the second component, part, region, layer, or section.

[0037] For ease of explanation, spatially relative terms such as "above," "upper," "lower," and "below" may be used herein to describe the relationship of one element relative to another element shown in the figures. These spatially relative terms are intended to encompass not only the orientation shown in the figures but also different orientations of the device during use or operation. For example, if the device in the figures is rotated, an element described as being "above" or "upper" relative to another element will now be described as being "below" or "below" relative to that other element. Therefore, the term "above" encompasses both upper and lower orientations depending on the spatial orientation of the device. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein shall be interpreted accordingly.

[0038] The terminology used herein is for illustrative purposes only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the articles "a" and "the" are intended to include the plural form as well. The terms "comprises," "includes," and "has" indicate the presence of the 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.

[0039] Due to manufacturing techniques and / or tolerances, the shapes shown in the drawings may change. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings, but include shape changes that occur during manufacturing.

[0040] As will be apparent upon understanding the disclosure of this application, the features of the examples described herein can be combined in various ways. Furthermore, although the examples described herein have multiple configurations, other configurations are also possible, as will be apparent upon understanding the disclosure of this application.

[0041] In the figures, for ease of explanation, the thickness, size, and shape of the lenses may have been slightly exaggerated. Specifically, the shapes of the spherical or aspherical surfaces shown in the figures are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the figures.

[0042] In the examples 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).

[0043] In the example, 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 (distance from the object-side surface of the first lens to the imaging plane), 2*ImgHT (diagonal length of the effective imaging area of ​​the imaging plane), ImgHT (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, i.e. half of 2*ImgHT) and focal length are expressed in millimeters (mm).

[0044] The thickness of the lens and other optical elements, the gap between the lens and other optical elements, and TTL are measured along the optical axis of the imaging lens system.

[0045] 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 the lens surface is the central portion of the lens surface surrounding and including the optical axis of the lens surface, wherein light rays incident on the lens surface form a small angle θ with the optical axis, and approximations sin°θ ≈ θ, tan°θ ≈ θ, and cos°θ ≈ 1 are valid.

[0046] For example, the 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 the statement that the image-side surface of a lens is concave means that at least the paraxial region of the image-side surface of the lens is concave. Therefore, 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 the 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 the peripheral region of the image-side surface of the lens may be convex.

[0047] 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 between the optical axis of the lens surface and the marginal ray passing through the lens surface in a direction perpendicular to the optical axis. The object-side surface and the image-side surface of the lens may have different effective aperture radii or effective radii.

[0048] The entrance pupil of an imaging lens system is the image of the aperture stop of the imaging lens system as seen from the object side of the imaging lens system. The exit pupil of an imaging lens system is the image of the aperture stop as seen from the image side of the imaging lens system.

[0049] The maximum chief ray angle (CRA) on the image side of the imaging lens system (maximum CRA) is the angle between the optical axis of the imaging lens system and the light ray that passes through the center of the exit pupil of the imaging lens system and is incident on the corner of the effective imaging area of ​​the imaging plane.

[0050] A first example of an imaging lens system may include seven 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 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.

[0051] The imaging lens system in the first embodiment may include a lens having a concave object-side surface. For example, in the imaging lens system of the first embodiment, the third lens may have a concave object-side surface.

[0052] A second example of an 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 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 may satisfy a predetermined conditional expression. For example, the imaging lens system may satisfy the conditional expression TTL / (2*ImgHT) < 0.6. In the conditional expression, TTL is the distance from the object-side surface of the first lens to the imaging plane, and 2*ImgHT is the diagonal length of the effective imaging area of ​​the imaging plane.

[0053] A third embodiment of the imaging lens system may include both the features of the first embodiment and the features of the second embodiment. For example, the imaging lens system in the third embodiment may include 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 toward the imaging plane of the imaging lens system, and may satisfy the conditional expression TTL / (2*ImgHT) < 0.6. Furthermore, in the imaging lens system of the third embodiment, the third lens may have a concave object-side surface.

[0054] In addition to the features of the first example, the fourth example of the imaging lens system may further include other features. For example, the imaging lens system in the fourth example may further include a third lens with positive refractive power and a seventh lens with a convex object-side surface. Furthermore, the imaging lens system in the fourth example may satisfy the conditional expression 0.7 < TTL / f < 1.2. In the conditional expression, f is the focal length of the imaging lens system.

[0055] A fifth embodiment of 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 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. Furthermore, the imaging lens system in the fifth embodiment may include lenses with negative refractive power. For example, in the imaging lens system of the fifth embodiment, the fourth lens may have negative refractive power.

[0056] Another example of an 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 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 may satisfy any one of the following conditional expressions 1 to 8 or any combination of any two or more of them. 84° ≦ FOV (Conditional Expression 1) f number < 1.9 (Conditional Expression 2) 0.1 < D34 / D67 < 0.3 (Conditional Expression 3) 0.4 < R1 / R11 < 0.8 (Conditional Expression 4) -0.8 < (R11-R12) / (R11+R12) < 0.6 (Conditional Expression 5) 0.4 < (R3-R4) / (R3+R4) < 0.6 (Conditional Expression 6) 0.1 < (R12*D56) / (f*ImgHT) < 0.3 (Conditional Expression 7) 1.0 < (V4+V5) / V3 < 2.0 (Conditional Expression 8)

[0057] In the above conditional expressions, FOV is the field of view of the imaging lens system and is expressed in degrees. The f-number is equal to the focal length f of the imaging lens system divided by the diameter of the entrance pupil of the imaging lens system and is a dimensionless quantity. (quantity), 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, D56 is the distance along the optical axis from the image-side surface of the fifth lens to the object-side surface of the sixth lens, D67 is the distance along the optical axis from the image-side surface of the sixth lens to the object-side surface of the seventh lens, R1 is the radius of curvature of the object-side surface of the first lens on the optical axis, R3 is the radius of curvature of the object-side surface of the second lens on the optical axis, R4 is the radius of curvature of the image-side surface of the second lens on the optical axis, R11 is the radius of curvature of the object-side surface of the sixth lens on the optical axis, R12 is the radius of curvature of the image-side surface of the sixth lens on the optical axis, ImgHT is the maximum effective image height on the imaging plane (equal to half the diagonal length of the effective imaging area of ​​the imaging plane), V3 is the Abbe number of the third lens, V4 is the Abbe number of the fourth lens, and V5 is the Abbe number of the fifth lens.

[0058] Another example of an 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 arranged in ascending numerical order from the object side of the imaging lens system toward the imaging plane of the imaging lens system, and may satisfy any one or any combination of two or more of the following conditional expressions 9 to 11: 84° < FOV < 100° (Conditional Expression 9) 1.2 < f-number < 1.9 (Conditional Expression 10) 0.4 < TTL / (2*ImgHT) < 0.6 (Conditional Expression 11)

[0059] If necessary, the imaging lens system according to the foregoing examples may include one or more lenses having the following characteristics. For example, the imaging lens system in the first example may include one of the first to seventh lenses having the following characteristics. As another example, the imaging lens system in the second example may include two or more of the first to seventh lenses having the following characteristics. However, the imaging lens system may not necessarily include lenses having the following characteristics.

[0060] The first to seventh lenses will be described in more detail below.

[0061] The first lens may have refractive power. For example, the first lens may have positive 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 or an aspherical surface. For example, both surfaces of the first lens may be aspherical. The first lens may be made of a material with high light transmittance and excellent workability. For example, the first lens may be made of plastic or glass. The first lens may have a predetermined refractive index. For example, the refractive index of the first lens may be less than 1.6. As another example, the refractive index of the first lens may be greater than 1.50 and less than 1.60. The first lens may have a predetermined Abbe number. For example, the Abbe number of the first lens may be less than 60. As another example, the Abbe number of the first lens may be greater than 50 and less than 60.

[0062] 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 convex. For example, the second lens may have a convex object-side surface. The second lens may include a spherical surface or an aspherical surface. For example, both surfaces of the second lens may be aspherical. The second lens may be made of a material with high light transmittance and excellent machinability. For example, the second lens may be made of plastic or glass. The second lens may have a refractive index greater than that of the first lens. For example, the refractive index of the second lens may be greater than 1.6. As another example, the refractive index of the second lens may be greater than 1.60 and less than 1.70. The second lens may have a predetermined Abbe number. For example, the Abbe number of the second lens may be less than 22. As another example, the Abbe number of the second lens may be greater than 17 and less than 22.

[0063] 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 image-side surface. The third lens may include a spherical surface or an aspherical surface. For example, both surfaces of the third lens may be aspherical. The third lens may be made of a material with high light transmittance and excellent processability. For example, the third lens may be made of plastic material. The third lens may have a refractive index lower than that of the second lens. For example, the refractive index of the third lens may be less than 1.6. As another example, the refractive index of the third lens may be greater than 1.5 and less than 1.6. The third lens may have a predetermined Abbe number. For example, the Abbe number of the third lens may be less than 40. As another example, the Abbe number of the third lens may be greater than 20 and less than 40.

[0064] The fourth lens may have refractive power. For example, the fourth lens may have negative refractive power. At least one surface of the fourth lens may be concave. For example, the fourth lens may have a concave object-side surface, or a concave image-side surface, or both a concave object-side surface and a concave image-side surface. The fourth lens may include a spherical surface or an aspherical surface. For example, both surfaces of the fourth lens may be aspherical. The fourth lens may be made of a material with high light transmittance and excellent processability. For example, the fourth lens may be made of a plastic material. The fourth lens may be configured to have a refractive index greater than that of the adjacent third and fifth lenses. For example, the refractive index of the fourth lens may be greater than 1.65. As another example, the refractive index of the fourth lens may be greater than 1.65 and less than 1.72. The fourth lens may have a predetermined Abbe number. For example, the Abbe number of the fourth lens may be less than 30. As another example, the Abbe number of the fourth lens may be greater than 18 and less than 23.

[0065] The fifth lens may have refractive power. For example, the fifth lens may have positive or negative refractive power. One surface of the fifth lens may be convex. For example, the fifth lens may have a convex object-side surface or a concave image-side surface. The fifth lens may include a spherical surface or an aspherical surface. For example, both surfaces of the fifth lens may be aspherical. The fifth lens may be made of a material with high light transmittance and excellent processability. For example, the fifth lens may be made of a plastic material. The fifth lens may be configured to have a refractive index greater than that of the sixth lens. For example, the refractive index of the fifth lens may be greater than 1.55. As another example, the refractive index of the fifth lens may be greater than 1.55 and less than 1.65. The fifth lens may have a predetermined Abbe number. For example, the Abbe number of the fifth lens may be less than 40. As another example, the Abbe number of the fifth lens may be greater than 20 and less than 40.

[0066] The sixth lens may have refractive power. For example, the sixth lens may have positive refractive power. One surface of the sixth lens may be concave. For example, the sixth lens may have a concave image-side surface. The sixth lens may include an aspherical surface. For example, both surfaces of the sixth lens may be aspherical. The sixth lens may be configured such that either the object-side surface or the image-side surface of the sixth lens, or the central and peripheral portions of both the object-side and image-side surfaces of the sixth lens, may have different shapes. For example, the object-side surface of the sixth lens may have a convex central portion and a concave peripheral portion. As another example, the image-side surface of the sixth lens may have a concave central portion and a convex peripheral portion. Either the object-side surface or the image-side surface of the sixth lens, or both the object-side and image-side surfaces of the sixth lens, may have an inflection point at which the shape of the surface changes from convex to concave or from concave to convex. The sixth lens may be made of a material with high light transmittance and excellent processability. For example, the sixth lens may be made of a plastic material. The sixth lens may be configured to have a predetermined refractive index. For example, the refractive index of the sixth lens may be less than 1.55. As another example, the refractive index of the sixth lens may be greater than 1.5 and less than 1.55. The sixth lens may have a predetermined Abbe number. For example, the Abbe number of the sixth lens may be greater than 50. As another example, the Abbe number of the sixth lens may be greater than 50 and less than 60.

[0067] The seventh lens may have refractive power. For example, the seventh lens may have negative refractive power. One surface of the seventh lens may be convex. For example, the seventh lens may have a convex object-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 be configured such that either the object-side surface or the image-side surface of the seventh lens, or the central and peripheral portions of both the object-side and image-side surfaces of the seventh lens, may have different shapes. For example, the object-side surface of the seventh lens may have a convex central portion and a concave peripheral portion. As another example, the image-side surface of the seventh lens may have a concave central portion and a convex peripheral portion. Either the object-side surface or the image-side surface of the seventh lens, or both the object-side and image-side surfaces of the seventh lens, may have an inflection point where the shape of the surface changes from convex to concave or from concave to convex. The seventh lens may be made of a material with high light transmittance and excellent processability. For example, the seventh lens may be made of a plastic material. The seventh lens can be configured to have a predetermined refractive index. For example, the refractive index of the seventh lens can be less than 1.6. As another example, the refractive index of the seventh lens can be greater than 1.5 and less than 1.6. The seventh lens can have a predetermined Abbe number. For example, the Abbe number of the seventh lens can be greater than 50. As another example, the Abbe number of the seventh lens can be greater than 50 and less than 60.

[0068] As described above, the first to seventh lenses may include spherical or aspherical surfaces. The aspherical surface of a lens may be represented by the following Equation 1. (1)

[0069] In Equation 1, c is the curvature of the lens surface and is equal to the reciprocal of the radius of curvature of the lens surface at the optical axis of the lens surface, k is the conic constant, r is the distance from any point on the lens surface to the optical axis of the lens surface in the direction perpendicular to the optical axis of the lens surface, A, B, C, D, E, F, G, H, J, L, M, N, O and P are aspherical constants, and Z (or sag) is the distance from a point on the lens surface at a distance r from the optical axis of the lens surface in the direction parallel to the optical axis of the lens surface to a tangential plane perpendicular to the optical axis and intersecting the vertex of the lens surface.

[0070] The imaging lens system according to the foregoing examples may further include an aperture stop and a filter. As an example, the imaging lens system may further include an aperture stop disposed between the second lens and the third lens. As another example, the imaging lens system may further include a filter disposed between the seventh lens and the imaging plane. The aperture stop may be configured to adjust the amount of light incident on the imaging plane, and the filter may be configured to block light of a specific wavelength or a specific wavelength range. The filter may be configured to block infrared light, but the light blocked by the filter is not limited to infrared light.

[0071] In the following text, examples of imaging lens systems will be illustrated with reference to the diagrams.

[0072] Figure 1 is a diagram showing a first example of an imaging lens system, and Figure 2 shows the aberration curves of the imaging lens system shown in Figure 1.

[0073] 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.

[0074] The first lens 110 may have positive 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 convex object-side surface and a concave image-side surface. The third lens 130 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fourth lens 140 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The fifth lens 150 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The sixth lens 160 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. Both the object-side surface and the image-side surface of the sixth lens 160 may have inflection points. The seventh lens 170 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. Both the object-side surface and the image-side surface of the seventh lens 170 may have inflection points.

[0075] The imaging lens system 100 may further include an aperture stop (not shown), a filter 180, and an imaging plane IP. For example, the aperture stop may be disposed between the second lens 120 and the third lens 130, and the filter 180 may be disposed between the seventh lens 170 and the imaging plane IP. However, the first embodiment is not limited thereto, and the imaging lens system 100 may not include an aperture stop and a filter 180. For example, if necessary, an aperture stop or a filter 180 may not be provided. The imaging plane IP may be disposed at the location where light incident via the first lens 110 to the seventh lens 170 is focused. For example, the imaging plane IP may be disposed on a surface of the image sensor IS of the camera module, or on an optical element disposed in the image sensor IS.

[0076] Tables 1 and 2 below list the optical characteristics and aspherical values ​​of a first example of an imaging lens system. Table 1 Surface number element radius of curvature Thickness / Distance Refractive index Abbe number Effective radius S1 First lens 2.322 0.854 1.546 55.990 1.680 S2 11.658 0.111 1.603 S3 Second lens 22.194 0.272 1.679 19.238 1.546 S4 6.248 0.404 1.396 S5 Third lens -39.374 0.365 1.571 37.403 1.372 S6 -8.891 0.091 1.385 S7 Fourth lens -36.302 0.296 1.679 19.238 1.430 S8 39.404 0.479 1.599 S9 Fifth lens -27.764 0.360 1.620 25.936 1.830 S10 -22.037 0.694 2.281 S11 Sixth lens 3.932 0.681 1.546 55.990 3.536 S12 6.810 0.839 3.862 S13 Seventh Lens 6.334 0.500 1.537 55.735 4.503 S14 2.103 0.236 4.696 S15 filter infinity 0.110 1.519 64.197 5.626 S16 infinity 0.823 5.671 S17 Imaging plane infinity -0.024 6.262 Table 2 Surface number S1 S2 S3 S4 S5 S6 S7 k -0.510897 13.768180 72.505571 4.250413 0.000000 23.484321 78.995537 A -0.010104 0.010507 0.043353 -0.007939 -0.015175 -0.015554 -0.052274 B 0.098141 -0.100201 -0.356851 0.249737 0.045101 -0.052289 0.090827 C -0.364622 0.560922 2.016395 -1.826346 -0.471857 0.555912 -0.526746 D 0.883544 -1.994849 -7.151729 7.963301 2.780760 -2.885580 2.369654 E -1.459612 4.739195 16.952124 -22.548464 -10.548721 9.270204 -7.449008 F 1.704086 -7.790900 -27.972545 43.650956 26.841588 -20.258618 16.161292 G -1.437145 9.076263 32.964566 -59.560377 -47.287492 31.252027 -24.735957 H 0.885195 -7.593422 -28.116201 58.197704 58.785435 -34.553086 27.150086 J -0.398542 4.575061 17.394742 -40.858501 -51.894288 27.450635 -21.464581 L 0.129784 -1.967175 -7.729376 20.410796 32.307565 -15.521682 12.115351 M -0.029780 0.588687 2.403772 -7.064542 -13.853369 6.090124 -4.758839 N 0.004570 -0.116464 -0.496604 1.605385 3.890246 -1.574877 1.234650 O -0.000421 0.013690 0.061215 -0.214501 -0.643474 0.241266 -0.189993 P 0.000018 -0.000724 -0.003407 0.012688 0.047488 -0.016583 0.013118 Surface number S8 S9 S10 S11 S12 S13 S14 k 0.000000 0.000000 0.000000 -17.084596 -16.163739 0.706176 -7.059311 A -0.048581 -0.058188 -0.066628 0.007787 0.008189 -0.126557 -0.068345 B 0.048486 0.033110 0.026812 -0.015826 -0.001479 0.052770 0.029360 C -0.103909 -0.081911 0.001190 0.006586 -0.004068 -0.015640 -0.010223 D 0.079561 0.313185 -0.022302 -0.003171 0.002582 0.002903 0.002719 E 0.301980 -0.772915 0.030870 0.001464 -0.000855 -0.000168 -0.000553 F -1.217286 1.221042 -0.024632 -0.000518 0.000188 -0.000057 0.000086 G 2.217461 -1.304125 0.013028 0.000129 -0.000030 0.000017 -0.000010 H -2.508384 0.971756 -0.004762 -0.000022 0.000003 -0.000002 0.000001 J 1.902865 -0.511614 0.001218 0.000003 0.000000 0.000000 0.000000 L -0.988457 0.189613 -0.000217 0.000000 0.000000 0.000000 0.000000 M 0.348098 -0.048385 0.000026 0.000000 0.000000 0.000000 0.000000 N -0.079626 0.008087 -0.000002 0.000000 0.000000 0.000000 0.000000 O 0.010691 -0.000796 0.000000 0.000000 0.000000 0.000000 0.000000 P -0.000640 0.000035 0.000000 0.000000 0.000000 0.000000 0.000000

[0077] Figure 3 is a diagram illustrating a second example of an imaging lens system, and Figure 4 shows the aberration curve of the imaging lens system shown in Figure 3.

[0078] 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.

[0079] The first lens 210 may have positive 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 convex object-side surface and a concave image-side surface. The third lens 230 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fourth lens 240 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The fifth lens 250 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The sixth lens 260 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. Both the object-side surface and the image-side surface of the sixth lens 260 may have inflection points. The seventh lens 270 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. Both the object-side surface and the image-side surface of the seventh lens 270 may have inflection points.

[0080] The imaging lens system 200 may further include an aperture stop (not shown), a filter 280, and an imaging plane IP. For example, the aperture stop may be disposed between the second lens 220 and the third lens 230, and the filter 280 may be disposed between the seventh lens 270 and the imaging plane IP. However, examples are not limited thereto, and the imaging lens system 200 may not include an aperture stop and a filter 280. For example, if necessary, an aperture stop or a filter 280 may not be provided. The imaging plane IP may be disposed at the location where light incident via 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 on an optical element disposed in the image sensor IS.

[0081] Tables 3 and 4 below list the optical characteristics and aspherical values ​​of the second example of the imaging lens system. Table 3 Surface number element radius of curvature Thickness / Distance Refractive index Abbe number Effective radius S1 First lens 2.408 0.874 1.546 55.990 1.711 S2 15.055 0.051 1.631 S3 Second lens 14.435 0.270 1.679 19.238 1.585 S4 5.749 0.382 1.420 S5 Third lens -34.689 0.359 1.571 37.403 1.394 S6 -12.489 0.192 1.350 S7 Fourth lens -76.695 0.320 1.668 20.377 1.420 S8 31.906 0.483 1.586 S9 Fifth lens 9.092 0.330 1.641 23.959 1.902 S10 7.232 0.594 2.351 S11 Sixth lens 3.802 0.582 1.546 55.990 3.477 S12 13.172 0.974 3.723 S13 Seventh Lens 10.110 0.505 1.537 55.735 4.470 S14 2.360 0.253 4.702 S15 filter infinity 0.110 1.519 64.197 5.610 S16 infinity 0.797 5.656 S17 Imaging plane infinity 0.012 6.270 Table 4 Surface number S1 S2 S3 S4 S5 S6 S7 k -0.634717 2.551979 47.386598 4.969090 -98.232437 63.605823 0.000000 A 0.021227 0.066865 0.002639 0.082881 0.018761 -0.036150 0.026491 B -0.086548 -0.590684 -0.067703 -0.936894 -0.275234 0.416108 -0.785551 C 0.209730 2.767052 0.311017 5.752979 1.796930 -2.765501 4.942113 D -0.158831 -8.275911 -1.081336 -22.165425 -7.238294 11.425459 -18.769658 E -0.345405 16.715368 2.715026 57.010537 19.154554 -30.912557 47.072293 F 1.111237 -23.527648 -4.676358 -101.84862 -34.707260 57.029646 -81.787391 G -1.519804 23.570391 5.555517 129.515786 44.052856 -73.729272 101.090361 H 1.283037 -17.006821 -4.625523 -118.71684 -39.534026 67.797994 -90.055748 J -0.727811 8.855724 2.722385 78.561501 25.006436 -44.485746 57.922772 L 0.283697 -3.296264 -1.127699 -37.142529 -10.950201 20.636374 -26.621627 M -0.075223 0.855035 0.321632 12.217832 3.190511 -6.597701 8.516259 N 0.012991 -0.146781 -0.060101 -2.652457 -0.571606 1.380381 -1.799332 O -0.001320 0.014984 0.006617 0.341117 0.053090 -0.169820 0.225502 P 0.000060 -0.000689 -0.000325 -0.019650 -0.001544 0.009300 -0.012689 Surface number S8 S9 S10 S11 S12 S13 S14 k -11.134866 0.000000 0.000000 -9.151978 9.774567 -58.794882 -2.352981 A -0.081926 -0.081114 -0.113411 -0.002098 0.023038 -0.084616 -0.094832 B 0.269150 -0.084891 0.076361 0.001977 -0.005425 0.035999 0.042839 C -1.270070 0.593057 -0.049757 -0.011932 -0.005398 -0.012392 -0.015799 D 4.240135 -1.592139 0.030474 0.010668 0.004467 0.003606 0.004447 E -9.797337 2.716277 -0.013679 -0.005591 -0.001843 -0.000786 -0.000932 F 15.909321 -3.200468 0.002579 0.001946 0.000502 0.000122 0.000145 G -18.490235 2.684632 0.001159 -0.000467 -0.000096 -0.000013 -0.000017 H 15.538441 -1.624894 -0.001110 0.000078 0.000013 0.000001 0.000001 J -9.447086 0.710569 0.000447 -0.000009 -0.000001 0.000000 0.000000 L 4.111231 -0.222069 -0.000111 0.000001 0.000000 0.000000 0.000000 M -1.247484 0.048284 0.000018 0.000000 0.000000 0.000000 0.000000 N 0.250490 -0.006926 -0.000002 0.000000 0.000000 0.000000 0.000000 O -0.029895 0.000588 0.000000 0.000000 0.000000 0.000000 0.000000 P 0.001604 -0.000022 0.000000 0.000000 0.000000 0.000000 0.000000

[0082] Figure 5 is a diagram showing a third example of an imaging lens system, and Figure 6 shows the aberration curve of the imaging lens system shown in Figure 5.

[0083] 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.

[0084] The first lens 310 may have positive 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 convex object-side surface and a concave image-side surface. The third lens 330 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fourth lens 340 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The fifth lens 350 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The sixth lens 360 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. Both the object-side surface and the image-side surface of the sixth lens 360 may have inflection points. The seventh lens 370 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. Both the object-side surface and the image-side surface of the seventh lens 370 may have inflection points.

[0085] The imaging lens system 300 may further include an aperture stop (not shown), a filter 380, and an imaging plane IP. For example, the aperture stop may be disposed between the second lens 320 and the third lens 330, and the filter 380 may be disposed between the seventh lens 370 and the imaging plane IP. However, a third embodiment is not limited thereto, and the imaging lens system 300 may not include the aperture stop and the filter 380. For example, if necessary, the aperture stop or the filter 380 may not be provided. The imaging plane IP may be disposed at the location where the light incident from 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 on an optical element disposed in the image sensor IS.

[0086] Tables 5 and 6 below list the optical characteristics and aspherical values ​​of the third example of the imaging lens system. Table 5 Surface number element radius of curvature Thickness / Distance Refractive index Abbe number Effective radius S1 First lens 2.399 0.871 1.546 55.990 1.710 S2 12.536 0.074 1.636 S3 Second lens 17.655 0.270 1.679 19.238 1.570 S4 6.136 0.381 1.408 S5 Third lens -36.792 0.394 1.571 37.403 1.389 S6 -11.758 0.182 1.360 S7 Fourth lens 45.116 0.329 1.657 21.536 1.425 S8 17.224 0.676 1.657 S9 Fifth lens 9.174 0.395 1.571 37.403 2.232 S10 7.179 0.407 2.800 S11 Sixth lens 3.771 0.591 1.546 55.990 3.373 S12 15.106 0.914 3.629 S13 Seventh Lens 28.819 0.470 1.537 55.735 4.360 S14 2.640 0.208 4.614 S15 filter infinity 0.110 1.519 64.197 5.591 S16 infinity 0.835 5.639 S17 Imaging plane infinity -0.018 6.275 Table 6 Surface number S1 S2 S3 S4 S5 S6 S7 k -0.805679 -32.874432 96.803060 9.752771 0.000000 63.457108 0.000000 A 0.009280 0.013765 -0.021121 0.034144 -0.004956 -0.025771 0.019090 B -0.012159 -0.177093 0.137314 -0.394268 -0.120828 -0.014832 -1.052001 C 0.005116 0.859671 -0.710111 2.462964 1.138476 0.247133 6.539123 D 0.104189 -2.504346 2.541644 -9.391366 -5.644350 -0.992443 -24.610225 E -0.354181 4.878402 -6.098058 23.828854 17.354874 2.655019 61.691144 F 0.598976 -6.657398 10.111070 -42.008139 -35.489539 -5.216149 -107.73827 G -0.634794 6.520376 -11.885980 52.709979 50.187100 7.627532 134.458892 H 0.453992 -4.635296 10.049932 -47.597287 -50.099391 -8.233488 -121.44350 J -0.225453 2.392840 -6.130769 30.924684 35.527948 6.465091 79.507179 L 0.078048 -0.886995 2.673472 -14.277291 -17.761485 -3.618789 -37.342095 M -0.018505 0.229857 -0.812465 4.550588 6.105153 1.399324 12.257402 N 0.002867 -0.039501 0.163386 -0.946899 -1.369204 -0.353909 -2.668917 O -0.000262 0.004042 -0.019535 0.114961 0.179717 0.052537 0.346301 P 0.000011 -0.000186 0.001051 -0.006118 -0.010420 -0.003464 -0.020270 Surface number S8 S9 S10 S11 S12 S13 S14 k -99.000000 10.375263 3.599462 -7.888093 15.471920 -43.360409 -2.534181 A -0.078025 -0.044643 -0.063121 0.031208 0.063348 -0.058991 -0.072255 B 0.201999 -0.030067 -0.025756 -0.072711 -0.061262 -0.007783 0.014291 C -1.077510 0.125109 0.072335 0.063772 0.036716 0.018137 0.000445 D 3.813858 -0.221418 -0.071941 -0.042397 -0.016865 -0.008645 -0.001086 E -8.822656 0.272391 0.047726 0.021092 0.005889 0.002469 0.000323 F 13.904621 -0.245478 -0.022951 -0.007780 -0.001564 -0.000487 -0.000055 G -15.399332 0.162485 0.008147 0.002101 0.000316 0.000069 0.000006 H 12.192334 -0.078698 -0.002139 -0.000410 -0.000048 -0.000007 -0.000001 J -6.933978 0.027651 0.000412 0.000057 0.000005 0.000001 0.000000 L 2.809754 -0.006931 -0.000057 -0.000006 0.000000 0.000000 0.000000 M -0.791500 0.001203 0.000006 0.000000 0.000000 0.000000 0.000000 N 0.147258 -0.000137 0.000000 0.000000 0.000000 0.000000 0.000000 O -0.016263 0.000009 0.000000 0.000000 0.000000 0.000000 0.000000 P 0.000807 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000

[0087] Figure 7 is a diagram showing a fourth example of an imaging lens system, and Figure 8 shows the aberration curves of the imaging lens system shown in Figure 7.

[0088] 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.

[0089] The first lens 410 may have positive 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 convex object-side surface and a concave image-side surface. The third lens 430 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fourth lens 440 may have negative refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 450 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The sixth lens 460 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. Both the object-side surface and the image-side surface of the sixth lens 460 may have inflection points. The seventh lens 470 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. Both the object-side surface and the image-side surface of the seventh lens 470 may have inflection points.

[0090] The imaging lens system 400 may further include an aperture stop (not shown), a filter 480, and an imaging plane IP. For example, the aperture stop may be disposed between the second lens 420 and the third lens 430, and the filter 480 may be disposed between the seventh lens 470 and the imaging plane IP. However, a fourth embodiment is not limited thereto, and the imaging lens system 400 may not include the aperture stop and the filter 480. For example, if necessary, the aperture stop or the filter 480 may not be provided. The imaging plane IP may be disposed at the location where the light incident via the first lens 410 to 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 on an optical element disposed in the image sensor IS.

[0091] Tables 7 and 8 below list the optical characteristics and aspherical values ​​of the fourth example of the imaging lens system. Table 7 Surface number element radius of curvature Thickness / Distance Refractive index Abbe number Effective radius S1 First lens 2.343 0.930 1.546 55.990 1.720 S2 14.429 0.050 1.639 S3 Second lens 18.505 0.270 1.668 20.377 1.579 S4 5.881 0.345 1.417 S5 Third lens -26.182 0.368 1.571 37.403 1.393 S6 -11.911 0.209 1.350 S7 Fourth lens -18.781 0.313 1.668 20.377 1.395 S8 -284.555 0.436 1.583 S9 Fifth lens 11.914 0.400 1.641 23.959 1.884 S10 10.037 0.706 2.314 S11 Sixth lens 3.126 0.563 1.546 55.990 3.668 S12 7.066 1.069 3.953 S13 Seventh Lens 72.524 0.500 1.537 55.735 4.650 S14 2.816 0.180 4.883 S15 filter infinity 0.110 1.519 64.197 5.665 S16 infinity 0.709 5.710 S17 Imaging plane infinity 0.030 6.261 Table 8 Surface number S1 S2 S3 S4 S5 S6 S7 k -0.730453 -37.257466 98.058633 4.915452 -86.543335 67.455905 0.000000 A -0.024681 -0.006016 -0.009690 0.002629 0.031100 -0.068652 -0.063597 B 0.222203 -0.010423 0.029719 0.039315 -0.392679 0.750562 0.208870 C -0.924682 0.087004 -0.107517 -0.722170 2.247206 -4.599034 -0.685419 D 2.452730 -0.277242 0.322688 4.945650 -8.069424 17.694195 0.670067 E -4.371894 0.541956 -0.694534 -19.091424 19.150603 -45.496197 3.066041 F 5.438958 -0.689466 1.093565 47.109812 -31.083703 81.151900 -14.545976 G -4.837853 0.574884 -1.280723 -78.870039 35.074132 -102.72395 31.533567 H 3.115729 -0.302034 1.121795 92.348805 -27.490010 93.344990 -42.938766 J -1.455622 0.083438 -0.730151 -76.526682 14.640906 -60.946523 39.594870 L 0.488386 0.002103 0.346685 44.705185 -4.987135 28.283635 -25.194532 M -0.114664 -0.010641 -0.116149 -18.010696 0.909981 -9.084295 10.932924 N 0.017880 0.003822 0.025917 4.762747 -0.016949 1.915777 -3.095598 O -0.001663 -0.000622 -0.003446 -0.743940 -0.023955 -0.238200 0.516262 P 0.000070 0.000041 0.000206 0.052007 0.003042 0.013212 -0.038503 Surface number S8 S9 S10 S11 S12 S13 S14 k -99.000000 0.000000 0.000000 -8.879353 -1.003142 24.944796 -3.558268 A -0.050984 -0.090420 -0.098650 0.001580 0.003554 -0.099016 -0.095078 B 0.003393 0.092737 0.077205 -0.011699 -0.008227 0.041584 0.045635 C 0.330471 -0.142707 -0.071604 0.011472 0.007337 -0.012379 -0.017156 D -1.769358 0.223835 0.070233 -0.008230 -0.004080 0.003302 0.004945 E 4.964138 -0.288742 -0.062324 0.003914 0.001410 -0.000707 -0.001056 F -8.965838 0.275427 0.043898 -0.001315 -0.000333 0.000111 0.000165 G 11.136061 -0.193699 -0.023267 0.000316 0.000057 -0.000012 -0.000019 H -9.788972 0.102589 0.009089 -0.000054 -0.000007 0.000001 0.000002 J 6.149233 -0.041834 -0.002581 0.000007 0.000001 0.000000 0.000000 L -2.745085 0.013209 0.000523 -0.000001 0.000000 0.000000 0.000000 M 0.850943 -0.003142 -0.000074 0.000000 0.000000 0.000000 0.000000 N -0.174208 0.000524 0.000007 0.000000 0.000000 0.000000 0.000000 O 0.021189 -0.000054 0.000000 0.000000 0.000000 0.000000 0.000000 P -0.001160 0.000002 0.000000 0.000000 0.000000 0.000000 0.000000

[0092] Figure 9 is a diagram showing a fifth example of an imaging lens system, and Figure 10 shows the aberration curves of the imaging lens system shown in Figure 9.

[0093] 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.

[0094] The first lens 510 may have positive 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 convex object-side surface and a concave image-side surface. The third lens 530 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fourth lens 540 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The fifth lens 550 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. The sixth lens 560 may have positive refractive power and may have a convex object-side surface and a concave image-side surface. Both the object-side surface and the image-side surface of the sixth lens 560 may have inflection points. The seventh lens 570 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. Both the object-side surface and the image-side surface of the seventh lens 570 may have inflection points.

[0095] The imaging lens system 500 may further include an aperture stop (not shown), a filter 580, and an imaging plane IP. For example, the aperture stop may be disposed between the second lens 520 and the third lens 530, and the filter 580 may be disposed between the seventh lens 570 and the imaging plane IP. However, a fifth embodiment is not limited thereto, and the imaging lens system 500 may not include the aperture stop and the filter 580. For example, if necessary, the aperture stop or the filter 580 may not be provided. The imaging plane IP may be disposed at the location where the light incident from 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 on an optical element disposed in the image sensor IS.

[0096] Tables 9 and 10 below list the optical characteristics and aspherical values ​​of the fifth example of the imaging lens system. Table 9 Surface number element radius of curvature Thickness / Distance Refractive index Abbe number Effective radius S1 First lens 2.251 0.941 1.546 55.990 1.720 S2 12.244 0.050 1.639 S3 Second lens 16.735 0.300 1.679 19.238 1.579 S4 6.366 0.352 1.417 S5 Third lens -15.858 0.351 1.571 37.403 1.393 S6 -11.704 0.163 1.350 S7 Fourth lens -91.567 0.300 1.679 19.238 1.395 S8 27.926 0.385 1.583 S9 Fifth lens 16.113 0.400 1.646 23.491 1.884 S10 16.230 0.794 2.314 S11 Sixth lens 3.569 0.550 1.546 55.990 3.668 S12 8.259 0.777 3.953 S13 Seventh Lens 45.008 0.579 1.537 55.735 4.650 S14 2.735 0.197 4.883 S15 filter infinity 0.110 1.519 64.197 5.665 S16 infinity 0.769 5.710 S17 Imaging plane infinity -0.030 6.261 Table 10 Surface number S1 S2 S3 S4 S5 S6 S7 k -0.698785 -50.109564 86.943035 5.901965 -88.665265 67.124569 0.000000 A -0.017452 0.004208 -0.044227 0.002423 0.121256 -0.079015 -0.055383 B 0.160709 -0.197129 0.245618 -0.024726 -1.580536 0.823393 -0.094448 C -0.636143 1.085758 -1.204609 -0.081127 10.555083 -5.188737 1.843655 D 1.639355 -3.402651 4.099615 1.694318 -44.537472 20.816923 -11.062749 E -2.870976 7.035340 -9.438417 -8.574712 126.751773 -55.683548 38.630942 F 3.533295 -10.123208 15.108524 23.978945 -253.27809 102.906000 -89.188226 G -3.123726 10.418177 -17.209223 -43.181547 364.071112 -134.51621 143.272181 H 2.007137 -7.770262 14.134296 53.118465 -381.09278 125.927345 -164.06096 J -0.938719 4.207356 -8.393053 -45.693856 290.912103 -84.561191 134.972547 L 0.316309 -1.637071 3.569863 27.529785 -160.28075 40.311621 -79.254965 M -0.074810 0.445947 -1.060359 -11.395557 62.088783 -13.288844 32.434905 N 0.011784 -0.080719 0.208871 3.088747 -16.047845 2.874590 -8.793593 O -0.001110 0.008720 -0.024518 -0.493633 2.485396 -0.366455 1.420036 P 0.000047 -0.000425 0.001298 0.035248 -0.174506 0.020834 -0.103434 Surface number S8 S9 S10 S11 S12 S13 S14 k -13.784079 -13.974345 3.251303 -13.931419 -3.699948 73.036093 -2.759412 A -0.068317 -0.094375 -0.104353 0.008358 0.005936 -0.089221 -0.089421 B 0.025185 -0.013691 0.102634 -0.019784 -0.021207 0.023829 0.035537 C 0.361135 0.426724 -0.158231 0.013629 0.021402 0.001308 -0.010827 D -1.926715 -1.544578 0.231806 -0.006224 -0.011546 -0.001900 0.002708 E 5.176312 3.280476 -0.255326 0.001693 0.003856 0.000484 -0.000541 F -8.853288 -4.646719 0.202287 -0.000307 -0.000871 -0.000071 0.000083 G 10.286858 4.579983 -0.115443 0.000044 0.000139 0.000007 -0.000009 H -8.331125 -3.202336 0.047651 -0.000006 -0.000016 0.000000 0.000001 J 4.729172 1.596056 -0.014195 0.000001 0.000001 0.000000 0.000000 L -1.859971 -0.562176 0.003017 0.000000 0.000000 0.000000 0.000000 M 0.490675 0.136448 -0.000446 0.000000 0.000000 0.000000 0.000000 N -0.081290 -0.021667 0.000043 0.000000 0.000000 0.000000 0.000000 O 0.007383 0.002022 -0.000003 0.000000 0.000000 0.000000 0.000000 P -0.000260 -0.000084 0.000000 0.000000 0.000000 0.000000 0.000000

[0097] Examples of the above-described imaging lens system may include any one or any combination of two or more of the following features. For example, the focal length of the imaging lens system may be 6.0 mm to 6.8 mm, the TTL of the imaging lens system may be 6.8 mm to 7.4 mm, the focal length of the first lens may be 4.6 mm to 5.6 mm, the focal length of the second lens may be -18 mm to -10 mm, the focal length of the third lens may be 18 mm to 80 mm, the focal length of the fourth lens may be -50 mm to -20 mm, the focal length of the fifth lens may be less than -50 mm or greater than 150 mm, the focal length of the sixth lens may be 7.0 mm to 18 mm, and the focal length of the seventh lens may be -8.0 mm to -3.0 mm.

[0098] Tables 11 and 12 below list the values ​​of parameters and conditional expressions for the first to fifth examples of the imaging lens system. Table 11 parameter First Case Second example Third Case Fourth example Fifth Case f number 1.890 1.890 1.890 1.890 1.890 TTL 7.090 7.090 7.090 7.190 6.990 ImgHT 6.000 6.000 6.000 6.000 6.000 FOV 85.30 85.30 85.30 85.00 85.40 f 6.360 6.324 6.332 6.377 6.350 f1 5.141 5.122 5.270 4.985 4.887 f2 -12.898 -14.253 -13.986 -13.012 -15.315 f3 20.034 33.993 30.106 37.935 75.944 f4 -27.788 -33.675 -42.580 -30.102 -31.490 f5 168.263 -59.262 -62.309 -108.359 1474.392 f6 15.716 9.571 9.031 9.766 11.047 f7 -6.114 -5.864 -5.445 -5.467 -5.447 Maximum CRA 38.200 38.400 39.900 37.500 37.200 Table 12 conditional expression First Case Second example Third Case Fourth example Fifth Case TTL / (2*ImgHT) 0.5908 0.5908 0.5908 0.5991 0.5824 TTL / f 1.1146 1.1211 1.1196 1.1273 1.1007 D34 / D67 0.1079 0.1968 0.1988 0.1957 0.2097 R1 / R11 0.5905 0.6335 0.6362 0.7497 0.6308 (R11-R12) / (R11+R12) -0.2679 -0.5521 -0.6005 -0.3866 -0.3965 (R3-R4) / (R3+R4) 0.5607 0.4303 0.4842 0.5176 0.4488 (R12*D56) / (f*ImgHT) 0.1238 0.2063 0.1619 0.1304 0.1721 (V4+V5) / V3 1.2078 1.1854 1.5758 1.1854 1.1424

[0099] The above examples can provide imaging lens systems with a wide field of view and reduced size.

[0100] Although this disclosure includes specific examples, it will be apparent upon understanding the disclosure of this application that various changes in form and detail may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples set forth herein are intended to be illustrative only and not for limiting purposes. The description of features or manner in each example is intended to be applicable to similar features or manner in other examples. Suitable results may be achieved if the described technology is performed in a different order, and / or if components in the described system, architecture, apparatus, or circuit are combined in a different manner and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of this disclosure is not defined by the detailed description but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are intended to be included in this disclosure. [Simplified Explanation of the Diagram]

[0030] Figure 1 is a diagram showing a first example of an imaging lens system. Figure 2 shows the aberration curves of the imaging lens system shown in Figure 1. Figure 3 is a diagram showing a second example of an imaging lens system. Figure 4 shows the aberration curves of the imaging lens system shown in Figure 3. Figure 5 is a diagram showing a third example of an imaging lens system. Figure 6 shows the aberration curves of the imaging lens system shown in Figure 5. Figure 7 is a diagram showing a fourth example of an imaging lens system. Figure 8 shows the aberration curves of the imaging lens system shown in Figure 7. Figure 9 is a diagram showing a fifth example of an imaging lens system. Figure 10 shows the aberration curves of the imaging lens system shown in Figure 9. Throughout all figures and detailed descriptions, the same reference numerals refer to the same elements. The figures may not be drawn to scale, and for clarity, illustrative purposes, the relative sizes, scales, and depictions of the elements in the figures may be exaggerated.

Claims

1. An imaging lens system, comprising: The first lens has refractive power; The second lens has a negative refractive force; The third lens has refractive power; the fourth lens has negative refractive power. The fifth lens has refractive power and a convex object-side surface in its paraxial region; the sixth lens has refractive power. And a seventh lens, having a convex object-side surface in its paraxial region, wherein the first lens to the seventh lens are arranged in ascending numerical order along the optical axis of the imaging lens system from the object side toward the imaging plane, wherein the imaging lens system has a total of seven refractive lenses, and wherein 1.0 < (V4+V5) / V3 < 2.0, where V3 is the Abbe number of the third lens, V4 is the Abbe number of the fourth lens, and V5 is the Abbe number of the fifth lens.

2. The imaging lens system of 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 second lens has a convex object-side surface in its paraxial region.

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

5. The imaging lens system of claim 1, wherein the fourth lens has a concave object-side surface in its paraxial region.

6. The imaging lens system of claim 1, wherein the sixth lens has a convex object-side surface in its paraxial region.

7. An imaging lens system, comprising: The first lens has refractive power; The second lens has a negative refractive force; The third lens has refractive power; the fourth lens has refractive power. The fifth lens has negative refractive power and a convex object-side surface in its paraxial region; the sixth lens has refractive power. And a seventh lens having a convex object-side surface in its paraxial region, wherein the first lens to the seventh lens are arranged in ascending numerical order from the object side toward the imaging plane along the optical axis of the imaging lens system, wherein the imaging lens system has a total of seven refractive lenses, and wherein -0.8 < (R11-R12) / (R11+R12) < -0.1, where R11 is the radius of curvature of the object-side surface of the sixth lens on the optical axis, and R12 is the radius of curvature of the image-side surface of the sixth lens on the optical axis.

8. The imaging lens system of claim 7, wherein the first lens has a convex object-side surface in its paraxial region.

9. The imaging lens system of claim 7, wherein the second lens has a convex object-side surface in its paraxial region.

10. The imaging lens system of claim 7, wherein the fourth lens has a convex object-side surface in its paraxial region.

11. The imaging lens system of claim 7, wherein the sixth lens has a convex object-side surface in its paraxial region.

Images