Imaging lens system with wide field of view

Abstract

An imaging lens system is provided. The imaging lens system includes a first lens having a refractive power, a second lens having a refractive power, a third lens having a concave object side surface, a fourth lens having a refractive power, a fifth lens having a refractive power, a sixth lens having a concave object side surface, and a seventh lens having a refractive power. The first lens to the seventh lens can be sequentially disposed from an object side to an imaging side. In the imaging lens system, 20 < V1-V3 and 190° ≤ FOV, where V1 is an Abbe number of the first lens, V3 is an Abbe number of the third lens, and FOV is a field of view of the imaging lens system.

Description

[0001] Cross - reference to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10 - 2022 - 0086796, filed on July 14, 2022, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. Technical field

[0003] The following description relates to an imaging lens system with a wide field of view (FOV) that can be installed in a camera. Background art

[0004] Recently produced vehicles are equipped with cameras to significantly reduce the likelihood of damage to people and property caused by traffic accidents. For example, one or more cameras can be installed on the front and rear bumpers of a vehicle to provide information to a driver about objects located in front of and behind the vehicle. Since accurately identifying objects around the vehicle and providing the identified information to the driver is important for vehicle cameras, an imaging lens system with high - resolution performance and a wide field of view is required.

[0005] However, due to limitations on the installation position, it may be difficult to install an imaging lens system with high resolution and a wide field of view in a vehicle camera. For example, in order to implement a vehicle camera with a low f - number, the diameters of the front - most lens and other lenses should be large, but it may be difficult to arbitrarily change the lens size due to the structural and design limitations of the vehicle components (e.g., bumpers) on which the camera is installed. Summary of the invention

[0006] The Summary of the Invention section is intended to introduce, in a brief form, a selection of inventive concepts, which will be further described in the Detailed Description section below. The Summary of the Invention section is not intended to identify the key features or essential features of the claimed subject matter, nor is it intended to assist in determining the scope of the claimed subject matter.

[0007] In general, an imaging lens system includes: a first lens having a refractive power; a second lens having a refractive power; a third lens having a concave object - side surface; a fourth lens having a refractive power; a fifth lens having a refractive power; a sixth lens having a concave object - side surface; and a seventh lens having a refractive power, wherein the first lens to the seventh lens are sequentially arranged from the object side to the imaging side, and wherein: 20 < V1 - V3, and 190° ≤ FOV, where V1 is the Abbe number of the first lens, V3 is the Abbe number of the third lens, and FOV is the field of view of the imaging lens system.

[0008] The third lens may have a positive refractive power.

[0009] The fourth lens can have a positive refractive power.

[0010] The fourth lens can have a concave object side surface.

[0011] The fifth lens can have a convex object side surface.

[0012] The sixth lens can have a concave image side surface.

[0013] The seventh lens can have a convex object side surface.

[0014] In the imaging lens system, 5.0 mm < f1234 < 12.5 mm, where f1234 is a combined focal length of the first lens to the fourth lens.

[0015] In the imaging lens system, 5.50 mm < f567 < 10.0 mm, where f567 is a combined focal length of the fifth lens to the seventh lens.

[0016] In a general aspect, an imaging lens system includes: a first lens having a negative refractive power; a second lens having a negative refractive power; a third lens having a refractive power; a fourth lens having a concave object side surface; a fifth lens having a refractive power; a sixth lens having a refractive power; and a seventh lens having a refractive power, where the first lens to the seventh lens are sequentially disposed from an object side to an image side, and where: -3.6 < (f5 + f7) / f6 < -2.6, and 8.0 < TTL / f < 10.0, where f is a focal length of the imaging lens system, f5 is a focal length of the fifth lens, f6 is a focal length of the sixth lens, f7 is a focal length of the seventh lens, and TTL is a distance from an object side surface of the first lens to an image plane.

[0017] 190° ≤ FOV, where FOV is a field of view of the imaging lens system.

[0018] -1.0 < f1 / f4 < -0.1, where f1 is a focal length of the first lens, and f4 is a focal length of the fourth lens.

[0019] -2.0 < f1 / f7 < -1.0, where f1 is a focal length of the first lens.

[0020] -2.0 < f5 / f6 < -1.0.

[0021] 2.0 < (R7 + R8) / (R7 - R8) < 8.0, where R7 is a radius of curvature of an object side surface of the fourth lens, and R8 is a radius of curvature of an image side surface of the fourth lens.

[0022] 0.20 < ImgHT / TTL < 0.30, where ImgHT is a height of the image plane.

[0023] In a general aspect, an imaging lens system includes: a first lens having a negative refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens having a positive refractive power; a fifth lens having a positive refractive power; a sixth lens having a negative refractive power; and a seventh lens having a positive refractive power, wherein the first lens to the seventh lens are sequentially disposed from an object side to an imaging side, wherein an image side surface of the fifth lens is spaced apart from an object side surface of the sixth lens, and an image side surface of the sixth lens is spaced apart from an object side surface of the seventh lens, and wherein 190° ≤ FOV, where FOV is a field of view of the imaging lens system.

[0024] The third lens and the fourth lens can have concave object side surfaces.

[0025] The second lens can have a concave object side surface.

[0026] 20 < V1 - V3 < -3.6 < (f5 + f7) / f6 < -2.6 and 8.0 < TTL / f < 10.0, where V1 is an Abbe number of the first lens, V3 is an Abbe number of the third lens, f is a focal length of the imaging lens system, f5 is a focal length of the fifth lens, f6 is a focal length of the sixth lens, f7 is a focal length of the seventh lens, and TTL is a distance from an object side surface of the first lens to an image plane.

[0027] Other features and aspects will become apparent from the following claims, drawings and detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 A configuration of an exemplary imaging lens system according to a first example is shown.

[0029] Figure 2 A configuration of an exemplary imaging lens system according to a second example is shown. Figure 1 Aberration curves of the exemplary imaging lens system shown.

[0030] Figure 3 A configuration of an exemplary imaging lens system according to a third example is shown.

[0031] Figure 4 A configuration of an exemplary imaging lens system according to a fourth example is shown. Figure 3 Aberration curves of the exemplary imaging lens system shown.

[0032] Figure 5 A configuration of an exemplary imaging lens system according to a third example is shown.

[0033] Figure 6 A configuration of an exemplary imaging lens system according to a fourth example is shown. Figure 5 Aberration curves of the exemplary imaging lens system shown.

[0034] Figure 7 A configuration of an exemplary imaging lens system according to a fourth example is shown.

[0035] Figure 8 A configuration of an exemplary imaging lens system according to a first example is shown. Figure 7 Aberration curves of the exemplary imaging lens system shown.

[0036] Figure 9 A configuration of an exemplary imaging lens system according to a fifth example is shown.

[0037] Figure 10 A configuration of an exemplary imaging lens system according to a second example is shown. Figure 9 Aberration curves of the exemplary imaging lens system shown.

[0038] Figure 11 A configuration of an exemplary imaging lens system according to a sixth example is shown.

[0039] Figure 12 A configuration of an exemplary imaging lens system according to a third example is shown. Figure 11 Aberration curves of the exemplary imaging lens system shown.

[0040] Figure 13 A configuration of an exemplary imaging lens system according to a seventh example is shown.

[0041] Figure 14 A configuration of an exemplary imaging lens system according to a fourth example is shown. Figure 13 Aberration curves of the exemplary imaging lens system shown.

[0042] Figure 15 A configuration of an exemplary imaging lens system according to an eighth example is shown.

[0043] Figure 16 A configuration of an exemplary imaging lens system according to a twelfth example is shown. Figure 15 Aberration curves of the exemplary imaging lens system shown.

[0044] Figure 17 A configuration of an exemplary imaging lens system according to a ninth example is shown.

[0045] Figure 18 A configuration of an exemplary imaging lens system according to a thirteenth example is shown. Figure 17 Aberration curves of the exemplary imaging lens system shown.

[0046] Figure 19 A configuration of an exemplary imaging lens system according to a tenth example is shown.

[0047] Figure 20 A configuration of an exemplary imaging lens system according to an eleventh example is shown. Figure 19 Aberration curves of the exemplary imaging lens system shown.

[0048] Figure 21 A configuration of an exemplary imaging lens system according to a twelfth example is shown.

[0049] Figure 22 A configuration of an exemplary imaging lens system according to a thirteenth example is shown. Figure 21Aberration curves for the exemplary imaging lens system shown.

[0050] Throughout the drawings and the detailed description, identical reference labels can refer to identical or similar elements. For the purpose of clarity, not all of the individual components of the embodiments described herein are shown in all of the figures, and figures are not necessarily drawn to scale. Relative dimensions, proportions and depiction of elements in the drawings can be exaggerated for purpose of clarity. DETAILED DESCRIPTION

[0051] The following detailed description is presented to aid in understanding the methods, apparatuses, and / or systems described herein. Various changes, modifications, and equivalents thereof will become apparent to those skilled in the art once the disclosure is understood. For example, the order of the operations described herein can be altered, except that certain operations must be performed before others, and the sequences described herein are not limited to the order presented unless a particular order is mandated by the disclosure. Furthermore, the description can omit details considered as known to persons skilled in the art. However, omission of such details is not intended to be a disavowal of such details.

[0052] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, these examples are provided as illustration of some of the many possible ways of implementing the methods, apparatuses, and / or systems described herein.

[0053] Although terminology can be used in this document, such as "first," "second," and "third," to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited by the terminology. Rather, the terminology is used only to distinguish one component, part, region, layer, or section from another component, part, region, layer, or section. Thus, a first component, part, region, layer, or section mentioned in these examples can also be called a second component, part, region, layer, or section without departing from the teachings of the examples described herein.

[0054] Throughout this specification, when an element such as a layer, region or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no other elements interposed therebetween. Similarly, expressions such as "between... and" and "directly between" and "adjacent to" and "directly adjacent to" can also be interpreted as described previously.

[0055] The terminology used herein is for the purpose of describing particular examples only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. As used herein, the terms "comprises", "comprising", "includes", "including" and "has" are intended to be inclusive and allow for there to be additional

[0056] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. For example, terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and are not to be interpreted in an idealized or overly formal sense unless explicitly so defined herein.

[0057] One or more examples provide an imaging lens system with high resolution and wide field of view while significantly reducing the variation in lens size.

[0058] In examples, 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). In the exemplary embodiments, the units of the radius of curvature, the thickness, the TTL (the distance from the object side surface of the first lens to the imaging plane), the ImgHT (the height of the imaging plane), the focal length, and the effective radius are expressed in millimeters (mm).

[0059] The thickness of the lens, the gap between the lenses, and the TTL refer to the distance of the lens on the optical axis. In addition, in the description of the shape of the lens, the configuration in which one surface is convex indicates that the paraxial region of the corresponding surface is convex, and the configuration in which one surface is concave indicates that the paraxial region of the surface is concave. Therefore, even when one surface of the lens is described as being convex, the edge of the lens can be concave. Similarly, even when one surface of the lens is described as being concave, the edge of the lens can be convex.

[0060] The imaging lens system described herein can be configured to be mounted on a transportation device. For example, the imaging lens system can be mounted on a front monitoring camera and a rear monitoring camera or an autonomous driving camera provided on a car, a truck, a van, a fire engine, a forklift, etc. However, the range and examples of use of the imaging lens system described herein are not limited to the above-described devices. For example, the imaging lens system can be mounted on an image capturing camera of a reconnaissance drone, a transportation drone, etc.

[0061] The imaging lens system according to the first aspect can include a plurality of lenses. For example, the imaging lens system can 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 order from an object side to an imaging side. The imaging lens system according to the first aspect can include a lens having a concave object side surface. For example, in the imaging lens system according to the first aspect, each of the third lens and the sixth lens can have a concave object side surface. The imaging lens system according to the first aspect can be configured to have a wide field of view (FOV). For example, the field of view of the imaging lens system according to the first aspect can be 190 degrees or more. In addition, the imaging lens system according to the first aspect can satisfy a predetermined conditional expression related to the Abbe number V1 of the first lens and the Abbe number V3 of the third lens. For example, the imaging lens system according to the first aspect can satisfy the following conditional expression:

[0062] 20 < V1 - V3

[0063] The imaging lens system according to the first aspect can further include other optical elements as needed. For example, the imaging lens system according to the first aspect can further include a diaphragm. The diaphragm can be disposed between one lens and another lens. For example, the diaphragm can be disposed between the fourth lens and the fifth lens. As another example, the diaphragm can be disposed between one lens and another lens having the same refractive power.

[0064] The imaging lens system according to the second aspect can include a plurality of lenses. For example, the imaging lens system can include, arranged in order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The imaging lens system according to the second aspect can include a lens having a negative refractive power. For example, in the imaging lens system according to the second aspect, each of the first lens and the second lens can have a negative refractive power. The imaging lens system according to the second aspect can include a lens having a concave object side surface. For example, in the imaging lens system according to the second aspect, the fourth lens can have a concave shape on the object side. The imaging lens system according to the second aspect can establish a predetermined numerical value relationship with respect to a focal length (f), a focal length of the fifth lens (f5), a focal length of the sixth lens (f6), a focal length of the seventh lens (f7), and a distance (TTL) from the object side surface of the first lens to the image surface. For example, the imaging lens system according to the second aspect can satisfy the following conditional expressions:

[0065] -3.6 < (f5 + f7) / f6 < -2.6

[0066] 8.0 < TTL / f < 10.0

[0067] The imaging lens system according to the third aspect can be configured to satisfy one or more of the following conditional expressions. For example, the imaging lens system according to the third aspect can include seven lenses, and can satisfy two or more of the following conditional expressions. As another example, the imaging lens system according to the third aspect can include seven lenses, and can be configured to satisfy all of the following conditional expressions. As another example, the imaging lens system according to the third aspect can satisfy one or more of the following conditional expressions, while having the features of one of the imaging lens systems according to the above-described first aspect and second aspect.

[0068] HFOV / L1S1ED < 15.75° / mm

[0069] 0.65 < L1S1ED / TTL

[0070] 0 < f1 / f2

[0071] f1 < 0 mm

[0072] f1 / f3 < 0

[0073] -10 mm < f6 < 0 mm

[0074] 20 < V1 - V3

[0075] 30 < V5 - V6

[0076] 335° mm < HFOV x f

[0077] 5.0mm < f1234 < 12.5mm

[0078] 5.50mm < f567 < 10.0mm

[0079] -1.0 < f / f6 < 0

[0080] In the above conditional expressions, HFOV is a horizontal field of view of the imaging lens system, L1S1ED is an effective diameter of an object side surface of the first lens, TTL is a distance from the object side surface of the first lens to an image plane, f1 is a focal length of the first lens, f2 is a focal length of the second lens, f3 is a focal length of the third lens, f6 is a focal length of the sixth lens, f1234 is a combined focal length of the first lens to the fourth lens, f567 is a combined focal length of the fifth lens to the seventh lens, V1 is an Abbe number of the first lens, V3 is an Abbe number of the third lens, V5 is an Abbe number of the fifth lens, V6 is an Abbe number of the sixth lens, and f is a focal length of the imaging lens system.

[0081] The imaging lens system according to the fourth aspect can be configured to satisfy one or more of the following conditional expressions. For example, the imaging lens system according to the fourth aspect can include seven lenses, and can satisfy two or more of the following conditional expressions. As another example, the imaging lens system according to the fourth aspect can include seven lenses, and can be configured to satisfy all of the following conditional expressions. As another example, the imaging lens system according to the fourth aspect can satisfy one or more of the following conditional expressions, while having the features of one of the imaging lens systems according to the above first aspect to third aspect.

[0082] 190° < FOV < 210°

[0083] 14.0° / mm < HFOV / L1S1ED < 15.75° / mm

[0084] 0.65 < L1S1ED / TTL < 0.75

[0085] 0 < f1 / f2 < 1.6

[0086] -9.0mm < f1 < -5.0mm

[0087] -1.2 < f1 / f3 < -0.40

[0088] -10mm < f6 < 0mm

[0089] 20 < V1-V3 < 26

[0090] 30 < V5-V6 < 50

[0091] 335° mm < HFOV x f < 350° mm

[0092] -5.0 < f1 / f < -3.0

[0093] -1.0 < f1 / f4 < -0.1

[0094] -2.0 < f1 / f7 < -1.0

[0095] -2.0 < f5 / f6 < -1.0

[0096] -3.6 < (f5+f7) / f6 < -2.6

[0097] 30 < |V6-V5| < 50

[0098] 0.20 < ImgHT / TTL < 0.30

[0099] 0.40 < SL / TTL < 0.50

[0100] 8.0 < TTL / f < 10.0

[0101] In the above conditional expressions, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, ImgHT is the height of the image plane, FOV is the field of view of the imaging lens system, and SL is the distance from the stop to the image plane.

[0102] The imaging lens system according to the fifth aspect can be configured to satisfy one or more of the following conditional expressions. For example, the imaging lens system according to the fifth aspect can include seven lenses, and can satisfy two or more of the following conditional expressions. As another example, the imaging lens system according to the fifth aspect can include seven lenses, and can be configured to satisfy all of the following conditional expressions. As another example, the imaging lens system according to the fifth aspect can satisfy one or more of the following conditional expressions, while having the features of one of the imaging lens systems according to the above first aspect to fourth aspect.

[0103] 2.0 < (R7+R8) / (R7-R8) < 8.0

[0104] -1.0 < (R8+R9) / (R8-R9) < 0

[0105] 1.0 < (T2+T3) / D23 < 2.1

[0106] 2.0 < (T3+T4) / D34 < 7.0

[0107] 5.0 < (T4+T5) / D45 < 15

[0108] 1.0 < T3 / D34 < 4.0

[0109] 2.0 < T4 / D45 < 8.0

[0110] 2.0 < D23 / D67 < 13.0

[0111] 0.3 < D45 / D67 < 3.0

[0112] In the above conditional expressions, R7 is a radius of curvature of an object side surface of the fourth lens, R8 is a radius of curvature of an image side surface of the fourth lens, R9 is a radius of curvature of an object side surface of the fifth lens, T2 is a thickness of the second lens at the center of the optical axis, T3 is a thickness of the third lens at the center of the optical axis, T4 is a thickness of the fourth lens at the center of the optical axis, T5 is a thickness of the fifth lens at the center of the optical axis, D23 is a distance from the image side surface of the second lens to the object side surface of the third lens, D34 is a distance from the image side surface of the third lens to the object side surface of the fourth lens, D45 is a distance from the image side surface of the fourth lens to the object side surface of the fifth lens, and D67 is a distance from the image side surface of the sixth lens to the object side surface of the seventh lens.

[0113] The imaging lens system according to one or more examples can include one or more lenses having the following characteristics as needed. For example, the imaging lens system according to the first aspect can include one of the first lens to the seventh lens having the following characteristics. As another example, the imaging lens system according to the second aspect to the fifth aspect can include one or more of the first lens to the seventh lens having the following characteristics. However, the above-described imaging lens system can not necessarily include a lens having the following characteristics. Hereinafter, the characteristics of the first lens to the seventh lens will be described.

[0114] The first lens has a refractive power. For example, the first lens can have a negative refractive power. The first lens can have a shape in which one surface is convex. For example, the first lens can have a convex object side surface. The first lens includes a spherical surface. For example, both surfaces of the first lens can be spherical. The first lens can be formed of a material having high light transmittance and excellent workability. For example, the first lens can be formed of a plastic material or a glass material. The first lens can be configured to have a predetermined refractive index. As an example, the refractive index of the first lens can be greater than 1.7. As a detailed example, the refractive index of the first lens can be greater than 1.72 and less than 1.84. The first lens can have a predetermined Abbe number. As an example, the Abbe number of the first lens can be 40 or more. As a detailed example, the Abbe number of the first lens can be greater than 40 and less than 60.

[0115] The second lens has a refractive power. For example, the second lens can have a negative refractive power. The second lens can have a shape in which one surface is concave. For example, the second lens can have a concave object side surface or a concave image side surface. The second lens can have an aspheric surface. For example, both surfaces of the second lens can be aspheric. The second lens can include a point of inflection. For example, the point of inflection can be formed on the object side surface of the second lens. The second lens can be formed of a material having high light transmittance and excellent processability. For example, the second lens can be formed of a plastic material or a glass material. The second lens can be configured to have a predetermined refractive index. For example, the refractive index of the second lens can be greater than 1.5. In an example, the refractive index of the second lens can have a value greater than 1.52 and less than 1.64. The second lens can have a predetermined Abbe number. For example, the Abbe number of the second lens can be equal to or greater than 50. In an example, the Abbe number of the second lens can have a value greater than 50 and less than 64.

[0116] The third lens has a refractive power. For example, the third lens can have a positive refractive power. The third lens can have a shape in which one surface is concave. As an example, the third lens can have a concave object side surface. The third lens can have an aspheric surface. For example, both surfaces of the third lens can be aspheric. The third lens can be formed of a material having high light transmittance and excellent processability. For example, the third lens can be formed of a plastic material or a glass material. The third lens can be configured to have a predetermined refractive index. For example, the refractive index of the third lens can be greater than 1.6 and less than 1.7. The third lens can have a predetermined Abbe number. For example, the Abbe number of the third lens can be greater than 20 and less than 40.

[0117] The fourth lens has a refractive power. For example, the fourth lens can have a positive refractive power. The fourth lens can have a shape in which one surface is concave. For example, the fourth lens can have a concave object side surface. The fourth lens can have an aspheric surface. For example, both surfaces of the fourth lens can be aspheric. The fourth lens can be formed of a material having high light transmittance and excellent processability. For example, the fourth lens can be formed of a plastic material or a glass material. The fourth lens can be configured to have a predetermined refractive index. For example, the refractive index of the fourth lens can be greater than 1.50 and less than 1.64. The fourth lens can have a predetermined Abbe number. For example, the Abbe number of the fourth lens can be greater than 50 and less than 70.

[0118] The fifth lens has a refractive power. For example, the fifth lens can have a positive refractive power. The fifth lens can have a surface in which one surface is convex. For example, the fifth lens can have a convex object side surface or a convex image side surface. The fifth lens can have an aspheric surface. For example, both surfaces of the fifth lens can be aspheric. The fifth lens can be formed of a material having high light transmittance and excellent workability. For example, the fifth lens can be formed of a plastic material or a glass material. The fifth lens can be configured to have a predetermined refractive index. For example, the refractive index of the fifth lens can be greater than 1.4. As a detailed example, the refractive index of the fifth lens can be greater than 1.46 and less than 1.64. The fifth lens can have a predetermined Abbe number. For example, the Abbe number of the fifth lens can be 50 or more. As a detailed example, the Abbe number of the fifth lens can be greater than 50 and less than 72.

[0119] The sixth lens has a refractive power. For example, the sixth lens can have a negative refractive power. The sixth lens can have a shape in which one surface is concave. For example, the sixth lens can have a concave object side surface. The sixth lens can have an aspheric surface. As an example, both surfaces of the sixth lens can be aspheric. The sixth lens can be formed of a material having high light transmittance and excellent workability. For example, the sixth lens can be formed of a plastic material or a glass material. The sixth lens can be configured to have a predetermined refractive index. For example, the refractive index of the sixth lens can be greater than 1.64 and less than 1.84. The sixth lens can have a predetermined Abbe number. For example, the Abbe number of the sixth lens can be greater than 18 and less than 30. The sixth lens can have a higher refractive power than the other lenses. For example, among the absolute values of the focal lengths of the first lens to the seventh lens, the sixth lens can have the lowest absolute value.

[0120] The seventh lens has a refractive power. For example, the seventh lens can have a positive refractive power. The seventh lens can have a surface in which one surface is convex. For example, the seventh lens can have a convex object side surface. The seventh lens can have an aspheric surface. For example, both surfaces of the seventh lens can be aspheric. A point of inflection can be formed on the seventh lens. For example, a point of inflection can be formed on at least one of the object side surface and the image side surface of the seventh lens. The seventh lens can be formed of a material having high light transmittance and excellent workability. For example, the seventh lens can be formed of a plastic material or a glass material. The seventh lens can be configured to have a predetermined refractive index. For example, the refractive index of the seventh lens can be greater than 1.50 and less than 1.64. The seventh lens can have a predetermined Abbe number. For example, the Abbe number of the seventh lens can be greater than 50 and less than 64.

[0121] The aspheric surface of the lens can be represented by Equation 1 below.

[0122] Equation 1:

[0123]

[0124] In Equation 1, "c" is the reciprocal of the radius of curvature of the corresponding lens, "k" is the conic constant, "r" is the distance from a certain point on the aspherical surface of the lens to the optical axis, "A to D" are aspherical constants, and "Z" (or SAG) is the height in the direction of the optical axis from a certain point on the aspherical surface of the lens to the vertex of the aspherical surface.

[0125] The imaging lens system according to the above-described aspect can further include a stop, a filter, and a cover glass. As an example, the imaging lens system can further include a stop disposed between the fourth lens and the fifth lens. The stop can be configured to adjust the intensity of light incident in the direction of the imaging surface. As another example, the imaging lens system can further include a filter and a cover glass disposed between the seventh lens and the imaging surface. The filter can be configured to block light having a specific wavelength, and the cover glass can be configured to block foreign matter or the like introduced in the direction of the upper surface. For reference, the filter described herein is configured to block infrared light, but can be configured to block ultraviolet light as needed.

[0126] Hereinafter, detailed examples of the imaging lens system will be described with reference to the accompanying drawings.

[0127] Reference will be made to Figure 1 An imaging lens system according to a first example will be described.

[0128] The imaging lens system 100 can 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.

[0129] The first lens 110 can have a negative refractive power and can have a convex object side surface and a convex image side surface. The second lens 120 can have a negative refractive power and can have a concave object side surface and a concave image side surface. The third lens 130 can have a positive refractive power and can have a concave object side surface and a convex image side surface. The fourth lens 140 can have a positive refractive power and can have a concave object side surface and a convex image side surface. The fifth lens 150 can have a positive refractive power and can have a convex object side surface and a convex image side surface. The sixth lens 160 can have a negative refractive power and can have a concave object side surface and a concave image side surface. The seventh lens 170 can have a positive refractive power and can have a convex object side surface and a convex image side surface.

[0130] The imaging lens system 100 can include a lens having an inflection point. For example, an inflection point can be formed on the object side surface of the second lens 120 in the imaging lens system 100 according to the present example. However, the lens on which the inflection point is formed is not limited to the second lens 120.

[0131] The imaging lens system 100 can further include a stop ST, a filter IF, a cover glass CG, and an imaging plane IP. The stop ST can be disposed between the fourth lens 140 and the fifth lens 150, and the filter IF and the cover glass CG can be sequentially disposed between the seventh lens 170 and the imaging plane IP. The imaging plane IP can be formed on one surface of an image sensor IS of a camera module, or inside the image sensor IS.

[0132] Tables 1 and 2 below show lens properties and aspherical values of the imaging lens system according to the present example, and Figure 2 is an aberration curve of the imaging lens system according to the present example.

[0133] Table 1

[0134] Surface Number Configuration Radius of Curvature Thickness / Distance Refractive Index Abbe Number Effective Radius S1 First Lens 12.832 0.800 1.776 49.6 6.060 S2 4.000 1.729 3.570 S3 Second Lens -38.524 0.800 1.623 60.3 3.270 S4 4.426 1.918 2.233 S5 Third Lens -4.155 1.689 1.626 25.9 1.887 S6 -3.009 0.530 1.719 S7 Fourth Lens -4.727 1.493 1.511 68.1 1.595 S8 -2.695 0.110 1.648 S9 Stop Infinity 0.245 1.519 S10 Fifth Lens 3.642 1.931 1.511 55.1 1.804 S11 -3.300 0.192 1.827 S12 Sixth Lens -3.159 0.800 1.816 22.8 1.770 S13 5.134 0.152 1.993 S14 Seventh Lens 3.903 2.163 1.623 60.3 2.530 S15 -6.318 0.600 2.744 S16 Filter Infinity 0.400 1.519 64.2 2.825 S17 Infinity 0.500 2.844 S18 Cover Glass Infinity 0.400 1.500 67.0 2.881 S19 Infinity 0.548 2.901 S20 Imaging Surface Infinity 0.000 2.970

[0135] Table 2

[0136]

[0137]

[0138] An imaging lens system according to a second example will be described with reference to Figure 3 An imaging lens system according to a second example will be described with reference to

[0139] The imaging lens system 200 can 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.

[0140] The first lens 210 can have a negative refractive power, and can have a convex object side surface and a concave image side surface. The second lens 220 can have a negative refractive power, and can have a convex object side surface and a concave image side surface. The third lens 230 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The fourth lens 240 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The fifth lens 250 can have a positive refractive power, and can have a convex object side surface and a convex image side surface. The sixth lens 260 can have a negative refractive power, and can have a concave object side surface and a concave image side surface. The seventh lens 270 can have a positive refractive power, and can have a convex object side surface and a convex image side surface.

[0141] The imaging lens system 200 can include a lens having an inflection point. For example, an inflection point can be formed on the object side surface of the second lens 220 in the imaging lens system 200 according to the present example. However, the lens in which the inflection point is formed is not limited to the second lens 220.

[0142] The imaging lens system 200 can further include a stop ST, a filter IF, a cover glass CG, and an imaging plane IP. The stop ST can be disposed between the fourth lens 240 and the fifth lens 250, and the filter IF and the cover glass CG can be sequentially disposed between the seventh lens 270 and the imaging plane IP. The imaging plane IP can be formed on one surface of an image sensor IS of a camera module, or inside the image sensor IS.

[0143] Tables 3 and 4 below show lens properties and aspherical values of the imaging lens system according to the present example, and Figure 4 is an aberration curve of the imaging lens system according to the present example.

[0144] Table 3

[0145]

[0146]

[0147] Table 4

[0148] Surface Number S3 S4 S5 S6 S7 S8 k 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A 1.3139E-02 2.2534E-02 -7.4457E-03 1.4067E-02 1.1580E-02 -4.0971E-03 B -4.6403E-04 4.4760E-04 8.4544E-04 3.1540E-04 -4.7383E-03 2.6901E-03 C -4.2017E-05 1.0026E-03 -1.0150E-05 1.1010E-05 7.7530E-04 -1.0179E-03 D 2.0748E-06 -2.6068E-04 0.0000E+00 5.8665E-05 -2.8293E-04 1.0317E-04 Surface Number S10 S11 S12 S13 S14 S15 k 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -1.7629E+00 -7.3794E+00 A -5.9569E-03 -2.4574E-02 -1.5702E-02 1.5776E-03 -5.6379E-03 -5.0998E-03 B 4.0665E-03 2.0740E-02 1.4283E-02 -2.0422E-03 1.1851E-03 3.0960E-03 C -1.1579E-03 -6.3321E-03 -4.6558E-03 7.4109E-04 -1.8062E-04 -5.4106E-04 D 1.2596E-04 7.1799E-04 5.6682E-04 -7.0181E-05 1.0284E-05 2.6293E-05

[0149] An imaging lens system according to a third example will be described with reference to Figure 5 An imaging lens system according to a third example will be described with reference to

[0150] The imaging lens system 300 can 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.

[0151] The first lens 310 can have a negative refractive power, and can have a convex object side surface and a concave image side surface. The second lens 320 can have a negative refractive power, and can have a convex object side surface and a concave image side surface. The third lens 330 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The fourth lens 340 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The fifth lens 350 can have a positive refractive power, and can have a convex object side surface and a convex image side surface. The sixth lens 360 can have a negative refractive power, and can have a concave object side surface and a concave image side surface. The seventh lens 370 can have a positive refractive power, and can have a convex object side surface and a convex image side surface.

[0152] The imaging lens system 300 can include a lens having an inflection point. For example, an inflection point can be formed on the object side surface of the second lens 320 in the imaging lens system 300 according to the present example. However, the lens in which the inflection point is formed is not limited to the second lens 320.

[0153] The imaging lens system 300 can further include a stop ST, a filter IF, a cover glass CG, and an imaging plane IP. The stop ST can be disposed between the fourth lens 340 and the fifth lens 350, and the filter IF and the cover glass CG can be sequentially disposed between the seventh lens 370 and the imaging plane IP. The imaging plane IP can be formed on one surface of an image sensor IS of a camera module, or inside the image sensor IS.

[0154] Tables 5 and 6 below show lens properties and aspherical values of the imaging lens system according to the present example, and Figure 6 is an aberration curve of the imaging lens system according to the present example.

[0155] Table 5

[0156]

[0157]

[0158] Table 6

[0159] Surface Number S3 S4 S5 S6 S7 S8 k 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A 1.5092E-02 2.3267E-02 -2.7332E-03 1.3830E-02 1.0028E-02 -2.4315E-03 B -1.2069E-03 9.9777E-04 1.0155E-03 1.6110E-05 -3.9738E-03 1.3333E-03 C 1.1994E-05 -1.1596E-04 -1.1108E-04 1.3238E-04 5.9993E-04 -5.1714E-04 D 9.7747E-07 -8.0312E-05 0.0000E+00 1.1462E-05 -1.9428E-04 4.2761E-05 Surface Number S10 S11 S12 S13 S14 S15 k 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -1.9132E+00 -5.2419E+00 A -4.7141E-03 -2.0003E-02 -1.6260E-02 -4.4228E-03 -9.8530E-03 -1.0965E-03 B 2.7249E-03 1.7069E-02 1.6150E-02 3.5464E-03 2.5914E-03 1.0610E-03 C -7.6289E-04 -5.3855E-03 -5.7360E-03 -6.0947E-04 -3.2254E-04 -1.9557E-04 D 9.7502E-05 6.4342E-04 7.1246E-04 4.3616E-05 1.3340E-05 6.6678E-06

[0160] An imaging lens system according to a fourth example will be described with reference to Figure 7 An imaging lens system according to a fourth example will be described with reference to

[0161] The imaging lens system 400 can 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.

[0162] The first lens 410 can have a negative refractive power, and can have a convex object side surface and a concave image side surface. The second lens 420 can have a negative refractive power, and can have a concave object side surface and a concave image side surface. The third lens 430 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The fourth lens 440 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The fifth lens 450 can have a positive refractive power, and can have a convex object side surface and a convex image side surface. The sixth lens 460 can have a negative refractive power, and can have a concave object side surface and a concave image side surface. The seventh lens 470 can have a positive refractive power, and can have a convex object side surface and a convex image side surface.

[0163] The imaging lens system 400 can include a lens having an inflection point. For example, an inflection point can be formed on the object side surface of the second lens 420 in the imaging lens system 400 according to the present example. However, the lens in which the inflection point is formed is not limited to the second lens 420.

[0164] The imaging lens system 400 can further include a stop ST, a filter IF, a cover glass CG, and an imaging plane IP. The stop ST can be disposed between the fourth lens 440 and the fifth lens 450, and the filter IF and the cover glass CG can be sequentially disposed between the seventh lens 470 and the imaging plane IP. The imaging plane IP can be formed on one surface of an image sensor IS of a camera module, or inside the image sensor IS.

[0165] Tables 7 and 8 below show lens properties and aspherical values of the imaging lens system according to the present example, and Figure 8 is an aberration curve of the imaging lens system according to the present example.

[0166] Table 7

[0167]

[0168]

[0169] Table 8

[0170] Surface Number S3 S4 S5 S6 S7 S8 k 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A 1.3992E-02 2.2404E-02 -2.9662E-03 1.3851E-02 9.6007E-03 -7.2238E-04 B -1.1006E-03 9.6540E-04 1.8313E-03 3.3025E-04 -4.0362E-03 -7.0245E-05 C -9.6373E-06 5.0835E-05 -3.2202E-04 -9.0142E-05 5.0030E-04 -6.7224E-05 D 2.4511E-06 -1.1659E-04 0.0000E+00 4.1842E-05 -1.3487E-04 -4.3474E-06 Surface Number S10 S11 S12 S13 S14 S15 k 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -1.7766E+00 -6.7029E+00 A -3.4698E-03 -1.6692E-02 -1.3794E-02 -5.8793E-03 -1.1092E-02 -5.0199E-04 B 1.4497E-03 1.3809E-02 1.3642E-02 4.4728E-03 3.3618E-03 1.1036E-03 C -3.8434E-04 -4.3015E-03 -4.7703E-03 -7.9598E-04 -4.6675E-04 -2.2599E-04 D 6.2085E-05 5.1751E-04 5.6995E-04 5.2029E-05 2.1634E-05 8.1714E-06

[0171] An imaging lens system according to a fifth example will be described with reference to Figure 9 An imaging lens system according to a fifth example will be described with reference to

[0172] The imaging lens system 500 can 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.

[0173] The first lens 510 can have a negative refractive power, and can have a convex object side surface and a concave image side surface. The second lens 520 can have a negative refractive power, and can have a concave object side surface and a concave image side surface. The third lens 530 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The fourth lens 540 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The fifth lens 550 can have a positive refractive power, and can have a convex object side surface and a convex image side surface. The sixth lens 560 can have a negative refractive power, and can have a concave object side surface and a concave image side surface. The seventh lens 570 can have a positive refractive power, and can have a convex object side surface and a convex image side surface.

[0174] The imaging lens system 500 can include a lens having an inflection point. For example, an inflection point can be formed on the image side surface of the second lens 520 in the imaging lens system 500 according to the present example. However, the lens in which the inflection point is formed is not limited to the second lens 520.

[0175] The imaging lens system 500 can further include a stop ST, a filter IF, a cover glass CG, and an imaging plane IP. The stop ST can be disposed between the fourth lens 540 and the fifth lens 550, and the filter IF and the cover glass CG can be sequentially disposed between the seventh lens 570 and the imaging plane IP. The imaging plane IP can be formed on one surface of an image sensor IS of a camera module, or inside the image sensor IS.

[0176] Tables 9 and 10 below show lens properties and aspherical values of the imaging lens system according to the present example, and Figure 10 is an aberration curve of the imaging lens system according to the present example.

[0177] Table 9

[0178]

[0179]

[0180] Table 10

[0181] Surface Number S3 S4 S5 S6 S7 S8 k 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A 1.6607E-02 2.2258E-02 -3.1870E-03 1.0008E-02 1.0492E-02 -5.9628E-04 B -2.6560E-03 -2.2668E-04 2.9622E-03 1.3047E-03 -3.9427E-03 -2.1663E-04 C 1.8046E-04 -3.1969E-04 -4.7754E-04 -4.1102E-04 6.6218E-05 3.4241E-05 D -4.5935E-06 0.0000E+00 0.0000E+00 4.3019E-05 6.7837E-06 0.0000E+00 Surface Number S10 S11 S12 S13 S14 S15 k 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -1.3809E+00 -3.5799E+00 A -5.8152E-03 -8.7467E-03 -9.3447E-03 -5.4431E-03 -5.3928E-03 1.1199E-03 B 4.8984E-04 1.0508E-02 1.0221E-02 2.0035E-03 1.4448E-03 3.5597E-04 C 3.0715E-04 -2.7726E-03 -2.9155E-03 -3.8528E-04 -2.3730E-04 -1.1135E-04 D -4.8946E-05 2.0467E-04 1.2953E-04 1.2886E-05 1.0567E-05 -1.3150E-06

[0182] An imaging lens system according to a sixth example will be described with reference to Figure 11 An imaging lens system according to a sixth example will be described with reference to

[0183] The imaging lens system 600 can include a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, a fifth lens 650, a sixth lens 660, and a seventh lens 670.

[0184] The first lens 610 can have a negative refractive power, and can have a convex object side surface and a concave image side surface. The second lens 620 can have a negative refractive power, and can have a concave object side surface and a concave image side surface. The third lens 630 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The fourth lens 640 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The fifth lens 650 can have a positive refractive power, and can have a convex object side surface and a convex image side surface. The sixth lens 660 can have a negative refractive power, and can have a concave object side surface and a concave image side surface. The seventh lens 670 can have a positive refractive power, and can have a convex object side surface and a convex image side surface.

[0185] The imaging lens system 600 can include a lens having an inflection point. For example, an inflection point can be formed on the object side surface of the second lens 620 in the imaging lens system 600 according to the present example. However, the lens in which the inflection point is formed is not limited to the second lens 620.

[0186] The imaging lens system 600 can further include a stop ST, a filter IF, a cover glass CG, and an imaging plane IP. The stop ST can be disposed between the fourth lens 640 and the fifth lens 650, and the filter IF and the cover glass CG can be sequentially disposed between the seventh lens 670 and the imaging plane IP. The imaging plane IP can be formed on one surface of an image sensor IS of a camera module, or inside the image sensor IS.

[0187] Tables 11 and 12 below show lens properties and aspherical values of the imaging lens system according to the present example, and Figure 12 is an aberration curve of the imaging lens system according to the present example.

[0188] Table 11

[0189] Surface Number Configuration Radius of Curvature Thickness / Distance Refractive Index Abbe Number Effective Radius S1 First Lens 14.843 0.800 1.776 49.6 5.729 S2 3.547 2.267 3.233 S3 Second Lens -14.486 0.800 1.539 56.0 3.034 S4 4.450 1.311 2.231 S5 Third Lens -9.634 1.214 1.613 26.9 2.181 S6 -3.379 0.980 2.137 S7 Fourth Lens -4.037 1.341 1.558 43.0 1.810 S8 -3.026 0.110 1.871 S9 Stop Infinity 0.439 1.471 S10 Fifth Lens 4.196 1.815 1.621 63.9 1.829 S11 -3.349 0.148 1.872 S12 Sixth Lens -3.819 0.800 1.655 21.0 1.794 S13 3.983 0.341 1.978 S14 Seventh Lens 5.251 2.456 1.539 56.0 2.233 S15 -5.812 0.600 2.686 S16 Filter Infinity 0.400 1.519 64.2 2.818 S17 Infinity 0.500 2.846 S18 Cover Glass Infinity 0.400 1.500 67.0 2.898 S19 Infinity 0.278 2.926 S20 Imaging Surface Infinity 0.000 2.955

[0190] Table 12

[0191]

[0192]

[0193] An imaging lens system according to a seventh example will be described with reference to Figure 13 An imaging lens system according to a seventh example will be described with reference to

[0194] The imaging lens system 700 includes a first lens 710, a second lens 720, a third lens 730, a fourth lens 740, a fifth lens 750, a sixth lens 760, and a seventh lens 770.

[0195] The first lens 710 can have a negative refractive power, and a convex object side surface and a concave image side surface. The second lens 720 can have a negative refractive power, and can have a concave object side surface and a concave image side surface. The third lens 730 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The fourth lens 740 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The fifth lens 750 can have a positive refractive power, and can have a convex object side surface and a convex image side surface. The sixth lens 760 can have a negative refractive power, and can have a concave object side surface and a concave image side surface. The seventh lens 770 can have a positive refractive power, and can have a convex object side surface and a convex image side surface.

[0196] The imaging lens system 700 can include a lens having an inflection point. For example, an inflection point can be formed on the object side surface of the second lens 720 in the imaging lens system 700 according to the present example. However, the lens in which the inflection point is formed is not limited to the second lens 720.

[0197] The imaging lens system 700 can further include a stop ST, a filter IF, a cover glass CG, and an imaging plane IP. The stop ST can be disposed between the fourth lens 740 and the fifth lens 750, and the filter IF and the cover glass CG can be sequentially disposed between the seventh lens 770 and the imaging plane IP. The imaging plane IP can be formed on one surface of an image sensor IS of a camera module, or inside the image sensor IS.

[0198] Tables 13 and 14 below show lens properties and aspherical values of the imaging lens system according to the present example, and Figure 14 is an aberration curve of the imaging lens system according to the present example.

[0199] Table 13

[0200] Surface Number Configuration Radius of Curvature Thickness / Distance Refractive Index Abbe Number Effective Radius S1 First Lens 13.844 0.800 1.776 49.6 5.737 S2 3.573 2.487 3.250 S3 Second Lens -9.374 0.800 1.539 56.0 3.022 S4 4.346 1.080 2.234 S5 Third Lens -165.076 1.422 1.613 26.9 2.193 S6 -4.130 0.879 2.107 S7 Fourth Lens -3.913 1.431 1.539 56.0 1.846 S8 -3.026 0.110 1.898 S9 Stop Infinity 0.346 1.446 S10 Fifth Lens 3.889 1.799 1.621 63.9 1.778 S11 -3.304 0.110 1.814 S12 Sixth Lens -3.597 0.800 1.646 23.5 1.766 S13 3.570 0.441 1.978 S14 Seventh Lens 5.020 2.101 1.539 56.0 2.387 S15 -5.285 0.600 2.671 S16 Filter Infinity 0.400 1.519 64.2 2.796 S17 Infinity 0.500 2.823 S18 Cover Glass Infinity 0.400 1.500 67.0 2.874 S19 Infinity 0.493 2.901 S20 Imaging Surface Infinity 0.000 2.952

[0201] Table 14

[0202]

[0203]

[0204] An imaging lens system according to an eighth example will be described with reference to Figure 15 An imaging lens system according to an eighth example will be described with reference to

[0205] The imaging lens system 800 can include a first lens 810, a second lens 820, a third lens 830, a fourth lens 840, a fifth lens 850, a sixth lens 860, and a seventh lens 870.

[0206] The first lens 810 can have a negative refractive power, and a convex object side surface and a concave image side surface. The second lens 820 can have a negative refractive power, and can have a concave object side surface and a concave image side surface. The third lens 830 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The fourth lens 840 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The fifth lens 850 can have a positive refractive power, and can have a convex object side surface and a convex image side surface. The sixth lens 860 can have a negative refractive power, and can have a concave object side surface and a concave image side surface. The seventh lens 870 can have a positive refractive power, and can have a convex object side surface and a convex image side surface.

[0207] The imaging lens system 800 can include a lens having an inflection point. For example, an inflection point can be formed on the object side surface of the second lens 820 in the imaging lens system 800 according to the present example. However, the lens in which the inflection point is formed is not limited to the second lens 820.

[0208] The imaging lens system 800 can further include a stop ST, a filter IF, a cover glass CG, and an imaging plane IP. The stop ST can be disposed between the fourth lens 840 and the fifth lens 850, and the filter IF and the cover glass CG can be sequentially disposed between the seventh lens 870 and the imaging plane IP. The imaging plane IP can be formed on one surface of an image sensor IS of a camera module, or inside the image sensor IS.

[0209] Tables 15 and 16 below show lens properties and aspherical values of the imaging lens system according to the present example, and Figure 16 is an aberration curve of the imaging lens system according to the present example.

[0210] Table 15

[0211]

[0212]

[0213] Table 16

[0214] Surface Number S3 S4 S5 S6 S7 S8 k 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A 1.2488E-02 1.8974E-02 -2.4840E-03 8.9698E-03 1.3257E-02 -8.4577E-04 B -1.9893E-03 -8.3062E-06 2.0378E-03 6.2389E-04 -3.7374E-03 -3.2311E-04 C 1.3397E-04 -1.8060E-04 -2.8719E-04 -2.3153E-04 1.1881E-04 2.5559E-05 D -3.6637E-06 -4.0127E-06 1.6095E-07 2.0608E-05 9.2512E-07 0.0000E+00 Surface Number S10 S11 S12 S13 S14 S15 k 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -1.1882E+00 -1.5380E+00 A -5.2300E-03 -2.4057E-03 -6.0218E-03 -6.4330E-03 -9.9387E-03 4.8513E-04 B 7.0022E-04 5.3321E-03 7.0932E-03 5.9962E-03 2.5623E-03 -2.4802E-04 C 8.8832E-05 -1.3077E-03 -2.2275E-03 -1.5021E-03 -2.9003E-04 4.4645E-05 D 0.0000E+00 7.8100E-05 9.6576E-05 1.1520E-04 8.6227E-06 -7.5514E-06

[0215] An imaging lens system according to a ninth example will be described with reference to Figure 17 An imaging lens system according to a ninth example will be described with reference to

[0216] The imaging lens system 900 can include a first lens 910, a second lens 920, a third lens 930, a fourth lens 940, a fifth lens 950, a sixth lens 960, and a seventh lens 970.

[0217] The first lens 910 can have a negative refractive power, and can have a convex object side surface and a concave image side surface. The second lens 920 can have a negative refractive power, and can have a concave object side surface and a concave image side surface. The third lens 930 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The fourth lens 940 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The fifth lens 950 can have a positive refractive power, and can have a convex object side surface and a convex image side surface. The sixth lens 960 can have a negative refractive power, and can have a concave object side surface and a concave image side surface. The seventh lens 970 can have a positive refractive power, and can have a convex object side surface and a convex image side surface.

[0218] The imaging lens system 900 can include a lens having an inflection point. For example, an inflection point can be formed on the object side surface of the second lens 920 in the imaging lens system 900 according to the present example. However, the lens in which the inflection point is formed is not limited to the second lens 920.

[0219] The imaging lens system 900 can further include a stop ST, a filter IF, a cover glass CG, and an imaging plane IP. The stop ST can be disposed between the fourth lens 940 and the fifth lens 950, and the filter IF and the cover glass CG can be sequentially disposed between the seventh lens 970 and the imaging plane IP. The imaging plane IP can be formed on one surface of an image sensor IS of a camera module, or inside the image sensor IS.

[0220] Tables 17 and 18 below show lens properties and aspherical values of the imaging lens system according to the present example, and Figure 18 is an aberration curve of the imaging lens system according to the present example.

[0221] Table 17

[0222]

[0223]

[0224] Table 18

[0225] Surface Number S3 S4 S5 S6 S7 S8 k 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A 1.3380E-02 2.1341E-02 -2.0549E-03 1.1085E-02 1.6647E-02 3.4050E-04 B -1.7835E-03 6.0519E-04 2.1892E-03 1.7899E-04 -5.3836E-03 -4.4804E-04 C 1.0822E-04 1.5664E-05 -4.0161E-04 -2.2804E-04 4.9594E-04 1.2788E-05 D -3.0079E-06 -6.6141E-05 1.1802E-05 2.1285E-05 -5.8307E-05 0.0000E+00 Surface Number S10 S11 S12 S13 S14 S15 k 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -1.3585E+00 -8.2641E-01 A -6.0650E-03 -3.2291E-03 -3.1351E-03 -7.5640E-04 -7.8503E-03 -2.6504E-03 B 9.8631E-04 4.0989E-03 1.7962E-03 1.7690E-03 1.5380E-03 6.8819E-04 C 1.7642E-04 -4.1834E-04 1.6703E-04 -2.5277E-05 -1.1480E-04 -6.6489E-05 D -3.6795E-05 -9.0310E-05 -2.6481E-04 -4.0008E-05 -7.6228E-07 -2.2305E-06

[0226] An imaging lens system according to a tenth example will be described with reference to Figure 19 An imaging lens system according to a tenth example will be described with reference to

[0227] The imaging lens system 1000 can include a first lens 1010, a second lens 1020, a third lens 1030, a fourth lens 1040, a fifth lens 1050, a sixth lens 1060, and a seventh lens 1070.

[0228] The first lens 1010 can have a negative refractive power, and can have a convex object side surface and a concave image side surface. The second lens 1020 can have a negative refractive power, and can have a concave object side surface and a concave image side surface. The third lens 1030 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The fourth lens 1040 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The fifth lens 1050 can have a positive refractive power, and can have a convex object side surface and a convex image side surface. The sixth lens 1060 can have a negative refractive power, and can have a concave object side surface and a concave image side surface. The seventh lens 1070 can have a positive refractive power, and can have a convex object side surface and a convex image side surface.

[0229] The imaging lens system 1000 can include a lens having a reverse point. For example, a reverse point can be formed on the object side surface of the second lens 1020 in the imaging lens system 1000 according to the present example. However, the lens in which the reverse point is formed is not limited to the second lens 1020.

[0230] The imaging lens system 1000 can further include a stop ST, a filter IF, a cover glass CG, and an imaging plane IP. The stop ST can be disposed between the fourth lens 1040 and the fifth lens 1050, and the filter IF and the cover glass CG can be sequentially disposed between the seventh lens 1070 and the imaging plane IP. The imaging plane IP can be formed on one surface of an image sensor IS of a camera module, or inside the image sensor IS.

[0231] Tables 19 and 20 below show lens properties and aspherical values of the imaging lens system according to the present example, and Figure 20 is an aberration curve of the imaging lens system according to the present example.

[0232] Table 19

[0233]

[0234]

[0235] Table 20

[0236] Surface Number S3 S4 S5 S6 S7 S8 k -1.0700E+01 3.5500E+00 -2.1700E+01 -4.0400E+00 -6.7700E+00 -3.1800E+00 A 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 B 1.3600E-02 2.0600E-02 -4.0800E-03 1.1600E-02 1.6200E-02 -3.0100E-04 C -1.5400E-03 3.9800E-04 2.7300E-03 5.4700E-04 -5.0400E-03 3.9400E-05 D 7.5000E-05 4.1400E-04 -5.0500E-04 -3.8000E-04 4.9900E-04 -5.1500E-05 E -1.6300E-06 -1.3300E-04 9.0100E-06 3.7300E-05 -6.7600E-05 Surface Number S10 S11 S12 S13 S14 S15 k 3.8400E+00 -3.5500E+00 -4.8800E+00 4.0400E+00 3.8800E+00 -1.3700E+01 A 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -1.4500E+00 3.7900E+00 B -8.5200E-03 -1.3600E-02 -8.0200E-03 2.0100E-04 -7.0500E-03 -2.7900E-03 C 1.1200E-03 1.2300E-02 8.9900E-03 9.1400E-04 1.2300E-03 6.7600E-04 D 2.0000E-04 -3.0100E-03 -2.7000E-03 -4.0200E-04 -8.8500E-05 -5.7800E-05 E -1.7300E-05 2.7000E-04 1.6300E-04 3.3200E-05 -9.9200E-07 -2.5300E-06

[0237] An imaging lens system according to an eleventh example will be described with reference to Figure 21 An imaging lens system according to an eleventh example will be described with reference to

[0238] The imaging lens system 1100 can include a first lens 1110, a second lens 1120, a third lens 1130, a fourth lens 1140, a fifth lens 1150, a sixth lens 1160, and a seventh lens 1170.

[0239] The first lens 1110 can have a negative refractive power, and can have a convex object side surface and a concave image side surface. The second lens 1120 can have a negative refractive power, and can have a concave object side surface and a concave image side surface. The third lens 1130 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The fourth lens 1140 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The fifth lens 1150 can have a positive refractive power, and can have a convex object side surface and a convex image side surface. The sixth lens 1160 can have a negative refractive power, and can have a concave object side surface and a concave image side surface. The seventh lens 1170 can have a positive refractive power, and can have a convex object side surface and a convex image side surface.

[0240] The imaging lens system 1100 can include a lens having an inflection point. For example, an inflection point can be formed on the object side surface of the second lens 1120 in the imaging lens system 1100 according to the present example. However, the lens in which the inflection point is formed is not limited to the second lens 1120.

[0241] The imaging lens system 1100 can further include a stop ST, a filter IF, a cover glass CG, and an imaging plane IP. The stop ST can be disposed between the fourth lens 1140 and the fifth lens 1150, and the filter IF and the cover glass CG can be sequentially disposed between the seventh lens 1170 and the imaging plane IP. The imaging plane IP can be formed on one surface of an image sensor IS of a camera module, or inside the image sensor IS.

[0242] Tables 21 and 22 below show lens properties and aspherical values of the imaging lens system according to the present example, and Figure 22 is an aberration curve of the imaging lens system according to the present example.

[0243] Table 21

[0244]

[0245]

[0246] Table 22

[0247] Surface Number S3 S4 S5 S6 S7 S8 k 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 A 5.5800E-01 4.4600E-01 -8.0000E-03 1.7100E-01 -4.3000E-02 -4.0000E-03 B -1.5800E-01 -1.0700E-01 -6.0000E-03 -1.9000E-02 -2.7000E-02 0.0000E+00 C 2.5000E-02 -2.5000E-02 -1.2000E-02 0.0000E+00 0.0000E+00 0.0000E+00 D -3.0000E-03 -2.0000E-03 1.0000E-03 2.0000E-03 0.0000E+00 0.0000E+00 Surface Number S10 S11 S12 S13 S14 S15 k 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 -1.6260E+00 1.3330E+01 A -3.4000E-02 2.0000E-03 -7.0000E-03 1.7000E-02 -1.3000E-01 -1.8100E-01 B 1.0000E-03 6.0000E-03 -3.0000E-03 -4.0000E-03 1.0000E-02 -3.2000E-02 C 0.0000E+00 -1.0000E-03 -2.0000E-03 -1.0000E-03 -2.0000E-03 -2.0000E-03 D 0.0000E+00 1.0000E-03 1.0000E-03 0.0000E+00 0.0000E+00 0.0000E+00

[0248] Tables 23 to 25 below show optical property values and conditional expression values of the imaging lens system according to the first to eleventh examples.

[0249] Table 23

[0250]

[0251]

[0252] Table 24

[0253]

[0254]

[0255] Table 25

[0256]

[0257]

[0258] As described above, an imaging lens system having a wide field of view (FOV) can be implemented.

[0259] While the present disclosure includes specific examples, it will be apparent to one of ordinary skill in the art, after having understood the disclosure of the present application, that various changes in form and detail can be made without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be understood as being descriptive in nature, and not for purposes of limitation. Descriptions of features or aspects within each example are to be considered as applicable to similar features or aspects within other examples. Proper results can still be achieved if the described techniques are performed in a different order, and / or if components within the described systems, architectures, devices, or circuits are combined or substituted for one another or are supplemented, not only by those that are logically equivalent but also by those that are equivalent in a more functional sense.

[0260] Accordingly, the scope of the present disclosure is not intended to be limited to the particular embodiments described in the specification, but rather only by the claims and their equivalents. All variations and modifications of the disclosed embodiments are intended to be included within the scope of the present disclosure.

Claims

1. An imaging lens system, comprising: a first lens having a negative refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power and a concave object side surface; a fourth lens having a positive refractive power; a fifth lens having a positive refractive power; a sixth lens having a negative refractive power and a concave object side surface; and a seventh lens having a positive refractive power, wherein the first lens to the seventh lens are sequentially arranged from an object side to an image side, wherein: 20 < V1-V3, 190° < FOV, and 8.0 < TTL / f < 10.0, wherein V1 is an Abbe number of the first lens, V3 is an Abbe number of the third lens, FOV is a field of view of the imaging lens system, f is a focal length of the imaging lens system, and TTL is a distance from an object side surface of the first lens to an image plane, and wherein the imaging lens system has a total of seven lenses.

2. The imaging lens system according to claim 1, wherein: -1.0 < f / f6 < 0, wherein f6 is a focal length of the sixth lens.

3. The imaging lens system according to claim 1, wherein: 0 < f1 / f2 < 1.6, wherein f1 is a focal length of the first lens, and f2 is a focal length of the second lens. the fourth lens has a concave object side surface.

4. The imaging lens system of claim 1, wherein, the fifth lens has a convex object side surface.

5. The imaging lens system of claim 1, wherein, the sixth lens has a concave image side surface.

6. The imaging lens system of claim 1, wherein, the seventh lens has a convex object side surface.

7. The imaging lens system of claim 1, wherein, 8. The imaging lens system according to claim 1, wherein: 5.0 mm < f1234 < 12.5 mm, wherein f1234 is a combined focal length of the first lens to the fourth lens.

9. The imaging lens system according to claim 1, wherein: 5.50 mm < f567 < 10.0 mm, wherein f567 is a combined focal length of the fifth lens to the seventh lens.

10. An imaging lens system, comprising: a first lens having a negative refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens having a positive refractive power and a concave object side surface; a fifth lens having a positive refractive power; a sixth lens having a negative refractive power; and a seventh lens having a positive refractive power, wherein the first lens to the seventh lens are sequentially arranged from an object side to an image side, wherein: -3.6 < (f5+f7) / f6 < -2.6, 8.0 < TTL / f < 10.0, and 190° < FOV, wherein f is a focal length of the imaging lens system, f5 is a focal length of the fifth lens, f6 is a focal length of the sixth lens, f7 is a focal length of the seventh lens, TTL is a distance from an object side surface of the first lens to an image plane, and FOV is a field of view of the imaging lens system, and wherein the imaging lens system has a total of seven lenses.

11. The imaging lens system according to claim 10, wherein: 5.0 < (T4+T5) / D45 < 15, ​ where T4 is a thickness of the fourth lens at a center of an optical axis, T5 is a thickness of the fifth lens at the center of the optical axis, and D45 is a distance from an image side surface of the fourth lens to an object side surface of the fifth lens. 12.The imaging lens system of claim 10, wherein: -1.0 < f1 / f4 < -0.1, where f1 is a focal length of the first lens, and f4 is a focal length of the fourth lens. 13.The imaging lens system of claim 10, wherein: -2.0 < f1 / f7 < -1.0, where f1 is a focal length of the first lens. 14.The imaging lens system of claim 10, wherein: -2.0 < f5 / f6 < -1.

0. 15.The imaging lens system of claim 10, wherein: 2.0 < (R7+R8) / (R7-R8) < 8.0, where R7 is a radius of curvature of an object side surface of the fourth lens, and R8 is a radius of curvature of an image side surface of the fourth lens. 16.The imaging lens system of claim 10, wherein: 0.20 < ImgHT / TTL < 0.30, where ImgHT is a height of the imaging surface. 17.An imaging lens system, comprising: a first lens having a negative refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens having a positive refractive power; a fifth lens having a positive refractive power; a sixth lens having a negative refractive power; and a seventh lens having a positive refractive power; wherein the first lens to the seventh lens are sequentially arranged from an object side to an imaging side, wherein an image side surface of the fifth lens is spaced apart from an object side surface of the sixth lens, and an image side surface of the sixth lens is spaced apart from an object side surface of the seventh lens, wherein 20 < V1-V3, where V1 is an Abbe number of the first lens, and V3 is an Abbe number of the third lens, wherein 190° ≤ FOV, where FOV is a field of view of the imaging lens system, wherein 8.0 < TTL / f < 10.0, where f is a focal length of the imaging lens system, and TTL is a distance from an object side surface of the first lens to an imaging surface, and wherein the imaging lens system has a total of seven lenses. the third lens and the fourth lens have concave object side surfaces.

18. The imaging lens system of claim 17, wherein, the second lens has a concave object side surface.

19. The imaging lens system of claim 17, wherein, 20.The imaging lens system of claim 17, wherein: -3.6 < (f5+f7) / f6 < -2.6, and where f5 is a focal length of the fifth lens, f6 is a focal length of the sixth lens, and f7 is a focal length of the seventh lens. ​

Images