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. The third lens has a concave object-side surface in its paraxial region. The first to seventh lenses 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, 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 surface, and 2*ImgHT is the diagonal length of the effective imaging area of ​​the imaging surface.

Description

[0001] Cross-references to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2021-0087917, filed with the Korean Intellectual Property Office on July 5, 2021, the entire disclosure of which is incorporated herein by reference for all purposes. Technical Field

[0003] This application discloses an imaging lens system with a wide field of view. Background Technology

[0004] 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.

[0005] The resolution of a camera module that includes an imaging lens system can be proportional to the size of the sensor and the imaging surface. For example, to achieve a high-resolution camera module that includes an imaging lens system, a relatively large sensor and imaging surface may be necessary. However, because the size (or length) of the camera module and imaging lens system increases proportionally to the size of the sensor and the imaging surface, 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

[0006] The summary portion of this invention is intended to provide a brief overview of the chosen inventive concepts, which will be further described in the detailed description portion below. This summary portion 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.

[0007] In one general aspect, 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, wherein the third lens has a concave object-side surface in its paraxial region; wherein the first to seventh lenses 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, 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 surface, and 2*ImgHT is the diagonal length of the effective imaging area of ​​the imaging surface.

[0008] The field of view of the imaging lens system can be 84 degrees or greater.

[0009] The f-number of an imaging lens system can be less than 1.9.

[0010] The condition expression 0.7 < TTL / f < 1.2 can be satisfied, where f is the focal length of the imaging lens system.

[0011] 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 of the third lens to the object side of the fourth lens, and D67 is the distance along the optical axis from the image side of the sixth lens to the object side of the seventh lens.

[0012] The condition expression 0.4 < R1 / R11 < 0.8 can be satisfied, where R1 is the radius of curvature on the optical axis of the object side of the first lens, and R11 is the radius of curvature on the optical axis of the object side of the sixth lens.

[0013] The condition expression -0.8 < (R11 - R12) / (R11 + R12) < -0.1 can be satisfied, where R11 is the radius of curvature on the optical axis of the object side of the sixth lens, and R12 is the radius of curvature on the optical axis of the image side of the sixth lens.

[0014] The condition expression 0.4 < (R3 - R4) / (R3 + R4) < 0.6 can be satisfied, where R3 is the radius of curvature on the optical axis of the object side of the second lens, and R4 is the radius of curvature on the optical axis of the image side of the second lens.

[0015] The condition expression 0.1 < (R12 * D56) / (f * ImgHT) < 0.3 can be satisfied, where R12 is the radius of curvature on the optical axis of the image side of the sixth lens, D56 is the distance along the optical axis from the image side of the fifth lens to the object side 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 surface.

[0016] The condition 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.

[0017] In another general aspect, an imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. Among them, the first lens has a refractive power; the second lens has a refractive power; the third lens has a positive refractive power and has a concave object side surface in its paraxial region; the fourth lens has a refractive power; the fifth lens has a refractive power; the sixth lens has a refractive power; and the seventh lens has a convex object side surface in its paraxial region. The first lens to the seventh lens are sequentially arranged at ascending intervals along the optical axis of the imaging lens system from the object side of the imaging lens system towards the imaging surface of the imaging lens system, and satisfy 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 surface, and f is the focal length of the imaging lens system.

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

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

[0020] The fourth lens may have a concave image side surface in its paraxial region.

[0021] The fourth lens may have a negative refractive power.

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

[0023] In another general aspect, an imaging lens system includes a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; and a seventh lens. Among them, 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 towards the imaging surface 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 surface, and 2*ImgHT is the diagonal length of the effective imaging area of the imaging surface, and the imaging lens system has any one or any combination of any 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.

[0024] The field of view of the imaging lens system may be 84 degrees or greater.

[0025] The f-number of the imaging lens system may be less than 1.9.

[0026] The conditional expression 0.7 < TTL / f < 1.2 may be satisfied, where f is the focal length of the imaging lens system.

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

[0028] Figure 1 This is a diagram illustrating a first example of an imaging lens system.

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

[0030] Figure 3 This is a diagram illustrating a second example of an imaging lens system.

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

[0032] Figure 5 This is a diagram illustrating a third example of an imaging lens system.

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

[0034] Figure 7 This is a diagram illustrating a fourth example of an imaging lens system.

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

[0036] Figure 9 This is a diagram illustrating the fifth example of an imaging lens system.

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

[0038] Throughout the accompanying drawings and detailed embodiments, the same reference numerals refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative dimensions, scale, and depiction of elements in the drawings may be exaggerated. Detailed Implementation

[0039] The following detailed embodiments are provided to help the reader gain a full understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative, except for operations that must occur in a specific order, and is not limited to the order set forth herein; rather, changes that will be apparent after understanding the disclosure of this application can be made. Furthermore, for clarity and conciseness, descriptions of features well-known in the art may be omitted.

[0040] The features described herein may be implemented in various forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways in which the methods, apparatus, and / or systems described herein will become apparent upon understanding the disclosure of this application.

[0041] The use of the word “may” (e.g., regarding what an example may include or implement) in describing various examples in this article means that there exists at least one example that includes or implements this feature, rather than all examples being limited to this.

[0042] Throughout this specification, when an element such as a layer, region, or substrate is described as being "on," "connected to," or "attached to" another element, the element may be directly "on," directly "connected to," or directly "attached to" the other element, or there may be one or more other elements between the element and the other element. Conversely, when an element is described as being "directly on," "directly connected to," or "directly attached to" another element, there are no other elements between the element and the other element.

[0043] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more items.

[0044] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited by these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or section from another. Therefore, without departing from the teachings of the examples described herein, the first component, first part, first region, first layer, or first section mentioned in the examples may also be referred to as a second component, second part, second region, second layer, or second section.

[0045] Spatial relative terms such as “above,” “above,” “below,” and “below” may be used herein for descriptive convenience to describe the relationship of one element relative to another, as shown in the accompanying drawings. In addition to covering the orientation depicted in the drawings, these spatial relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “above” another element would be located “below” or “below” that other element. Thus, depending on the spatial orientation of the device, the term “above” covers both “above” and “below” orientations. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0046] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the articles “a,” “an,” and “the” are intended to include plural forms as well. The terms “comprising,” “including,” and “having” indicate the presence of stated features, numbers, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, components, elements, and / or combinations thereof.

[0047] The shapes shown in the accompanying drawings may vary due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include shape variations that occur during manufacturing.

[0048] The features of the examples described herein can be combined in various ways, as will be apparent upon understanding the disclosure of this application. 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.

[0049] In the accompanying drawings, for ease of explanation, the thickness, size, and shape of the lenses may be slightly exaggerated. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is to say, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings.

[0050] 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 surface (or image sensor).

[0051] In the example, 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 of the first lens to the imaging surface), 2*ImgHT (diagonal length of the effective imaging area of ​​the imaging surface), ImgHT (maximum effective image height on the imaging surface, which is equal to half the diagonal length of the effective imaging area of ​​the imaging surface, i.e., half of 2*ImgHT), and the focal length are expressed in millimeters (mm).

[0052] The thickness of the lens and other optical elements, the gap between the lens and other optical elements, and the TTL are measured along the optical axis of the imaging lens system.

[0053] Unless otherwise stated, references to the shape of a lens surface refer to the shape of the paraxial region of the lens surface. The paraxial region of a lens surface is the central portion of the lens surface surrounding and including the optical axis of the lens surface, wherein light rays incident on the lens surface form a small angle θ with the optical axis, and the following approximations are valid: sinθ≈θ, tanθ≈θ, and cosθ≈1.

[0054] For example, the description of a lens's object-side surface being convex implies that at least the paraxial region of the lens's object-side surface is convex, and the description of a lens's image-side surface being concave implies that at least the paraxial region of the lens's image-side surface 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. Similarly, 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.

[0055] 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 it 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 and the edge ray of light passing through the lens surface, in a direction perpendicular to the optical axis of the lens surface. The object-side surface and the image-side surface of a lens can have different effective aperture radii or effective radii.

[0056] The entrance pupil of an imaging lens system is the image of the aperture stop 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 seen from the image side of the imaging lens system.

[0057] The image-side maximum principal ray angle (Max CRA) of an imaging lens system is the angle between the optical axis of the imaging lens system and the ray that passes through the center of the exit pupil of the imaging lens system and is incident on the effective imaging area of ​​the imaging plane.

[0058] 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 that are sequentially arranged in ascending order from the object side of the imaging lens system toward the imaging surface of the imaging lens system along the optical axis of the imaging lens system.

[0059] The imaging lens system in the first example may include a lens having a concave object side surface. For example, in the imaging lens system of the first example, the third lens may have a concave object side surface.

[0060] 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 that are sequentially arranged in ascending order from the object side of the imaging lens system toward the imaging surface of the imaging lens system along the optical axis of the imaging lens system, and 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 surface, and 2*ImgHT is the diagonal length of the effective imaging area of the imaging surface.

[0061] A third example of an imaging lens system may include the characteristics of both the first example and the second example. For example, the imaging lens system in the third example 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 of the imaging lens system toward the imaging surface of the imaging lens system along the optical axis of the imaging lens system, and may satisfy the conditional expression TTL / (2*ImgHT) < 0.6. In addition, in the imaging lens system of the third example, the third lens may have a concave object side surface.

[0062] A fourth example of an imaging lens system may further include other characteristics in addition to the characteristics of the first example. For example, the imaging lens system in the fourth example may further include a third lens having a positive refractive power and a seventh lens having a convex object side surface. In addition, 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.

[0063] A fifth 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 that are sequentially arranged in ascending order from the object side of the imaging lens system toward the imaging surface of the imaging lens system along the optical axis of the imaging lens system. In addition, the imaging lens system in the fifth example may include a lens having a negative refractive power. For example, in the imaging lens system of the fifth example, the fourth lens may have a negative refractive power.

[0064] 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 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, and may satisfy any one or any combination of any two or more of the following conditional expressions 1 to conditional expression 8.

[0065] 84°≤FOV (Conditional Expression 1)

[0066] f-number < 1.9 (Conditional Expression 2)

[0067] 0.1 < D34 / D67 < 0.3 (Conditional Expression 3)

[0068] 0.4 < R1 / R11 < 0.8 (Conditional Expression 4)

[0069] -0.8 < (R11 - R12) / (R11 + R12) < 0.6 (Conditional Expression 5)

[0070] 0.4 < (R3 - R4) / (R3 + R4) < 0. June (Conditional Expression 6)

[0071] 0.1 < (R12 * D56) / (f * ImgHT) < 0.3 (Conditional Expression 7)

[0072] 1.0 < (V4 + V5) / V3 < 2.0 (Conditional Expression 8)

[0073] 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 entrance pupil diameter of the imaging lens system, and is a dimensionless 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 on the optical axis of the object side surface of the first lens, R3 is the radius of curvature on the optical axis of the object side surface of the second lens, R4 is the radius of curvature on the optical axis of the image side surface of the second lens, R11 is the radius of curvature on the optical axis of the object side surface of the sixth lens, R12 is the radius of curvature on the optical axis of the image side surface of the sixth lens, ImgHT is the maximum effective image height on the imaging surface (equal to half of the diagonal length of the effective imaging area of the imaging surface), 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.

[0074] 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 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, and may satisfy any one or any combination of any two or more of the following conditional expressions 9 to conditional expressions 11.

[0075] 84° < FOV < 100° (conditional expression 9)

[0076] 1.2 < f-number < 1.9 (conditional expression 10)

[0077] 0.4 < TTL / (2*ImgHT) < 0.6 (conditional expression 11)

[0078] If needed, 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 lens to the seventh lens having the following characteristics. As another example, the imaging lens system in the second example may include two or more of the first lens to the seventh lens having the following characteristics. However, the imaging lens system may not necessarily include lenses having the following characteristics.

[0079] Hereinafter, the first lens to the seventh lens will be described in more detail.

[0080] The first lens may have a refractive power. For example, the first lens may have a 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 having a high light transmittance and excellent processability. For example, the first lens may be made of a plastic material or a glass material. 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.

[0081] 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 processability. For example, the second lens may be made of plastic or glass. The refractive index of the second lens may be 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.

[0082] 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 a plastic material. The refractive index of the third lens may be less than the refractive index 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.

[0083] 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 30.

[0084] 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 or 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.

[0085] 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 the central and peripheral portions of one or both of 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. One or both of the object-side and image-side surfaces of the sixth lens may have a point of inflection, 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.

[0086] 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 the central and peripheral portions of one or both of 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. One or both of the object-side and image-side surfaces of the seventh lens may have a point of inflection, at which 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 may be configured to have a predetermined refractive index. For example, the refractive index of the seventh lens may be less than 1.6. As another example, the refractive index of the seventh lens may be greater than 1.5 and less than 1.6. The seventh lens may have a predetermined Abbe number. For example, the Abbe number of the seventh lens may be greater than 50. As another example, the Abbe number of the seventh lens may be greater than 50 and less than 60.

[0087] The first through seventh lenses may include spherical or aspherical surfaces as described above.

[0088] The aspherical surface of a lens can be represented by the following equation 1.

[0089]

[0090] In Equation 1, c is the curvature of the lens surface, which 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 between a point on the lens surface at a distance r from the optical axis of the lens surface and a tangent perpendicular to the optical axis and intersecting the vertex of the lens surface, which is the distance in the direction parallel to the optical axis of the lens surface.

[0091] The imaging lens system according to the foregoing example may further include an aperture stop and a filter. As an example, the imaging lens system may also include an aperture stop disposed between the second lens and the third lens. As another example, the imaging lens system may also 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.

[0092] In the following description, an example of an imaging lens system will be described with reference to the accompanying drawings.

[0093] Figure 1 This is a diagram illustrating a first example of an imaging lens system, and Figure 2 It shows Figure 1 The aberration curves of the imaging lens system are shown.

[0094] 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.

[0095] 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 image-side surface of the sixth lens 160 may have a point of inflection. 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 image-side surface of the seventh lens 170 may have a point of inflection.

[0096] The imaging lens system 100 may further include an aperture stop (not shown), a filter 180, and an imaging surface 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 surface IP. However, the first example is not limited thereto, and the imaging lens system 100 may not include an aperture stop and a filter 180. For example, if necessary, the aperture stop or the filter 180 may not be provided. The imaging surface IP may be disposed at the location where light incident through the first lens 110 to the seventh lens 170 is focused. For example, the imaging surface 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.

[0097] Tables 1 and 2 below list the optical properties and aspherical values ​​of a first example of an imaging lens system.

[0098] Table 1

[0099]

[0100]

[0101] Table 2

[0102] Face 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 Face 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

[0103] Figure 3 This is a diagram illustrating a second example of an imaging lens system, and Figure 4 It shows Figure 3 The aberration curves of the imaging lens system are shown.

[0104] 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.

[0105] 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 a point of inflection. 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 a point of inflection.

[0106] The imaging lens system 200 may also include an aperture stop (not shown), a filter 280, and an imaging surface 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 surface 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, the aperture stop or filter 280 may not be provided. The imaging surface IP may be disposed at the location 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 a surface of the image sensor IS of the camera module or on an optical element disposed in the image sensor IS.

[0107] Tables 3 and 4 below list the optical properties and aspherical values ​​of a second example of the imaging lens system.

[0108] Table 3

[0109]

[0110]

[0111] Table 4

[0112]

[0113]

[0114] Figure 5 This is a diagram illustrating a third example of an imaging lens system, and Figure 6 It shows Figure 5 The aberration curves of the imaging lens system are shown.

[0115] 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.

[0116] 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 a point of inflection. 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 a point of inflection.

[0117] The imaging lens system 300 may further include an aperture stop (not shown), a filter 380, and an imaging surface 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 surface IP. However, this is not a third example, and the imaging lens system 300 may not include an aperture stop and a filter 380. For example, if necessary, the aperture stop or filter 380 may be omitted. The imaging surface IP may be disposed at the location 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 a surface of the image sensor IS of the camera module or on an optical element disposed in the image sensor IS.

[0118] Tables 5 and 6 below list the optical properties and aspherical values ​​of the third example of the imaging lens system.

[0119] Table 5

[0120]

[0121] Table 6

[0122]

[0123]

[0124] Figure 7 This is a diagram illustrating a fourth example of an imaging lens system, and Figure 8 It shows Figure 7 The aberration curves of the imaging lens system are shown.

[0125] 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.

[0126] 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 image-side surface of the sixth lens 460 may have a point of inflection. 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 image-side surface of the seventh lens 470 may have a point of inflection.

[0127] The imaging lens system 400 may further include an aperture stop (not shown), a filter 480, and an imaging surface 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 surface IP. However, this is not a fourth example, and the imaging lens system 400 may not include an aperture stop and a filter 480. For example, if desired, the aperture stop or filter 480 may be omitted. The imaging surface IP may be disposed at the location 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 a surface of the image sensor IS of the camera module or on an optical element disposed in the image sensor IS.

[0128] Tables 7 and 8 below list the optical properties and aspherical values ​​of the fourth example of the imaging lens system.

[0129] Table 7

[0130]

[0131] Table 8

[0132]

[0133]

[0134] Figure 9 This is a diagram illustrating a fifth example of an imaging lens system, and Figure 10 It shows Figure 9 The aberration curves of the imaging lens system are shown.

[0135] 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.

[0136] 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 a point of inflection. 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 a point of inflection.

[0137] The imaging lens system 500 may further include an aperture stop (not shown), a filter 580, and an imaging surface 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 surface IP. However, this is not a fifth example, and the imaging lens system 500 may not include an aperture stop and a filter 580. For example, if necessary, the aperture stop or filter 580 may be omitted. The imaging surface IP may be disposed at the location 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 a surface of the image sensor IS of the camera module or on an optical element disposed in the image sensor IS.

[0138] Tables 9 and 10 below list the optical properties and aspherical values ​​of the fifth example of the imaging lens system.

[0139] Table 9

[0140]

[0141]

[0142] Table 10

[0143]

[0144]

[0145] Examples of the imaging lens system described above 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, and 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.

[0146] Tables 11 and 12 below list the parameter values ​​and conditional expressions for the first through fifth examples of the imaging lens system.

[0147] Table 11

[0148] parameter First Example Second example Third Example Fourth example Fifth example 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 Max CRA 38.200 38.400 39.900 37.500 37.200

[0149] Table 12

[0150]

[0151]

[0152] The above examples can provide imaging lens systems with a wide field of view and reduced size.

[0153] While this disclosure includes specific examples, it will be apparent upon understanding the disclosure of this application that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein should be interpreted in a descriptive sense only and not for limiting purposes. The description of features or aspects in each example should be considered applicable to similar features or aspects in other examples. Suitable results may also be obtained if the described techniques are performed in a different order, and / or if components in the described system, architecture, apparatus, or circuit are combined in different ways and / or replaced or supplemented with other components or their equivalents. Therefore, the scope of this 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 this disclosure.

Claims

1. An imaging lens system, characterized in that, include: The first lens has positive refractive power and has a convex object side and a concave image side in its paraxial region; The second lens has negative refractive power and has a convex object side and a concave image side in its paraxial region; The third lens has positive refractive power and has a concave object side and a convex image side in its paraxial region; The fourth lens has negative refractive power; The fifth lens has refractive power; The sixth lens has positive refractive power and has a convex object-side surface and a concave image-side surface in its paraxial region; The seventh lens has negative refractive power and has a convex object-side surface and a concave image-side surface in its paraxial region; as well as Image sensor, 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 contains seven lenses with refractive power; and The following conditional expression is satisfied: TTL / (2 ImgHT) < 0.6; 0.4 < (R3-R4) / (R3+R4) < 0.6; and 0.1 < (R12 D56) / (f ImgHT) < 0.3, Wherein, TTL is the distance along the optical axis from the object side of the first lens to the imaging plane, 2 ImgHT is the diagonal length of the effective imaging area of ​​the imaging surface, R3 is the radius of curvature on the optical axis of the object side of the second lens, R4 is the radius of curvature on the optical axis of the image side of the second lens, R12 is the radius of curvature on the optical axis of the image side of the sixth lens, D56 is the distance along the optical axis from the image side of the fifth lens to the object side 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 surface.

2. The imaging lens system according to claim 1, wherein, The field of view of the imaging lens system is 84 degrees or greater.

3. The imaging lens system according to claim 1, wherein, The f-number of the imaging lens system is less than 1.

9.

4. The imaging lens system according to claim 1, wherein, The following conditional expression is satisfied: 0.7 < TTL / f < 1.

2.

5. The imaging lens system according to claim 1, wherein, The following conditional expression is satisfied: 0.1 < D34 / D67 < 0.3 Wherein, D34 is the distance along the optical axis from the image side of the third lens to the object side of the fourth lens, and D67 is the distance along the optical axis from the image side of the sixth lens to the object side of the seventh lens.

6. The imaging lens system according to claim 1, wherein, The following conditional expression is satisfied: 0.4 < R1 / R11 < 0.8 Wherein, R1 is the radius of curvature on the optical axis of the object side surface of the first lens, and R11 is the radius of curvature on the optical axis of the object side surface of the sixth lens.

7. The imaging lens system according to claim 1, wherein, The following conditional expression is satisfied: -0.8 < (R11-R12) / (R11+R12) < -0.1 Wherein, R11 is the radius of curvature on the optical axis of the object side of the sixth lens.

8. The imaging lens system according to claim 1, wherein, The following conditional expression is satisfied: 1.0 < (V4+V5) / V3 < 2.0 Wherein, 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.

9. An imaging lens system, characterized in that, include: The first lens has positive refractive power and has a convex object side and a concave image side in its paraxial region; The second lens has negative refractive power and has a convex object side and a concave image side in its paraxial region; The third lens has positive refractive power and has a concave object side and a convex image side in its paraxial region; The fourth lens has negative refractive power; The fifth lens has refractive power; The sixth lens has positive refractive power and has a convex object-side surface and a concave image-side surface in its paraxial region; The seventh lens has negative refractive power and has a convex object-side surface and a concave image-side surface in its paraxial region; as well as Image sensor; 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 surface of the imaging lens system, at intervals between each other in ascending order. The imaging lens system contains seven lenses with refractive power; and The following conditional expression is satisfied: 0.7 < TTL / f < 1.2; 0.4 < (R3-R4) / (R3+R4) < 0.6; and 0.1 < (R12 D56) / (f ImgHT) < 0.3, Wherein, TTL is the distance along the optical axis from the object side of the first lens to the imaging surface, f is the focal length of the imaging lens system, R3 is the radius of curvature on the optical axis of the object side of the second lens, R4 is the radius of curvature on the optical axis of the image side of the second lens, R12 is the radius of curvature on the optical axis of the image side of the sixth lens, D56 is the distance along the optical axis from the image side of the fifth lens to the object side of the sixth lens, and ImgHT is the maximum effective image height on the imaging surface.

10. The imaging lens system according to claim 9, wherein, The fourth lens has a concave object-side surface in its paraxial region.

11. The imaging lens system according to claim 9, wherein, The fourth lens has a concave image-side surface in its paraxial region.

Images