Imaging lens system

Abstract

The imaging lens system includes: a first lens having refractive power, a second lens having a concave object-side surface, a third lens having refractive power, a fourth lens having a concave object-side surface, a fifth lens having refractive power, a sixth lens having a concave object-side surface, and a seventh lens having refractive power, wherein the first lens to the seventh lens are arranged in sequence from the object side, and wherein the field of view of the imaging lens system is 190 degrees or greater.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2022-0064176 filed on May 25, 2022, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety for all purposes. Technical Field

[0003] Embodiments of the present disclosure relate to an imaging lens system that can be mounted on a camera requiring a wide field of view. Background Art

[0004] Vehicles may include cameras to reduce damage to people and property due to traffic accidents. For example, one or more cameras may be provided on the front and rear bumpers of a vehicle to provide the driver with information about objects located in front of and behind the vehicle. Since it may be important for a vehicle camera to accurately identify objects around the vehicle and provide information to the driver, an imaging lens system with high-resolution performance and a wide field of view may be necessary. However, due to limitations on the installation location, it may not be easy to install an imaging lens system with high resolution and a wide field of view in a vehicle camera. For example, in order to achieve a vehicle camera with a relatively low f-number, it may be necessary to increase the diameter of the front lens and other lenses, but due to structural and design limitations of the vehicle component (e.g., the bumper) on which the camera is provided, it may be difficult to change the lens size.

[0005] The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with respect to the present disclosure. Summary of the Invention

[0006] This Summary is provided to briefly introduce a selection of inventive concepts that will be further described in the Detailed Description below. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

[0007] In a general aspect, an imaging lens system includes: a first lens having refractive power, a second lens having a concave object-side surface, a third lens having refractive power, a fourth lens having a concave object-side surface, a fifth lens having refractive power, a sixth lens having a concave object-side surface, and a seventh lens having refractive power, wherein the first to seventh lenses are arranged in sequence from the object side, and wherein the field of view of the imaging lens system is 190 degrees or greater.

[0008] The first lens may have a convex object-side surface.

[0009] The third lens may have a convex image side surface.

[0010] The fifth lens may have a convex object side surface.

[0011] The seventh lens may have a convex object side surface.

[0012] The following conditional expression may be satisfied: 0 < f1 / f2, where f1 is the focal length of the first lens and f2 is the focal length of the second lens.

[0013] The following conditional expression may be satisfied: f1 / f3 < 0, where f1 is the focal length of the first lens and f3 is the focal length of the third lens.

[0014] The following conditional expression may be satisfied: 15 < V1 - V3, where V1 is the Abbe number of the first lens and V3 is the Abbe number of the third lens.

[0015] The following conditional expression may be satisfied: 30 < V5 - V6, where V5 is the Abbe number of the fifth lens and V6 is the Abbe number of the sixth lens.

[0016] The following conditional expression may be satisfied: -168 mm < f1234 < 23.0 mm, where f1234 is the combined focal length of the first lens to the fourth lens.

[0017] The following conditional expression may be satisfied: 3.5 mm < f567 < 7.0 mm, where f567 is the combined focal length of the fifth lens to the seventh lens.

[0018] In another general aspect, the imaging lens system includes: a first lens having a refractive power, a second lens having a 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 concave object side surface, and a seventh lens having a refractive power, wherein the first lens to the seventh lens are arranged in sequence from the object side, and wherein the f-number of the imaging lens system is equal to or less than 1.9, and the field of view (FOV) of the imaging lens system is equal to or greater than 190 degrees.

[0019] The following conditional expression may be satisfied: 330°mm < FOV × f < 370°mm, where f is the focal length of the imaging lens system.

[0020] The following conditional expression may be satisfied: 0.6 < f1 / f2 < 2.0, where f1 is the focal length of the first lens and f2 is the focal length of the second lens.

[0021] The following conditional expression may be satisfied: -3.0 < R1 / R3 < -0.4, where R1 is the radius of curvature of the object side surface of the first lens and R3 is the radius of curvature of the object side surface of the second lens.

[0022] In another general aspect, an imaging lens system includes: a first lens having negative refractive power and a convex object-side surface, a second lens having negative refractive power and a concave object-side surface, a third lens having positive refractive power and a convex object-side surface, a fourth lens having a concave object-side surface, a fifth lens having positive refractive power and a convex object-side surface, a sixth lens having negative refractive power and a concave object-side surface, and a seventh lens having positive refractive power and a convex object-side surface, wherein the first to seventh lenses are arranged in sequence from the object side.

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

[0024] The fourth lens may have negative refractive power.

[0025] The f-number of the imaging lens system may be equal to or less than 1.9, and the field of view of the imaging lens system may be equal to or greater than 190 degrees.

[0026] Other features and aspects will become apparent from the appended claims, the accompanying drawings, and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a diagram illustrating an imaging lens system according to a first embodiment of the present disclosure.

[0028] Figure 2 Shown Figure 1 Aberration curves of the imaging lens system shown.

[0029] Figure 3 is a diagram illustrating an imaging lens system according to a second embodiment of the present disclosure.

[0030] Figure 4 Shown Figure 3 Aberration curves of the imaging lens system shown.

[0031] Figure 5 is a diagram illustrating an imaging lens system according to a third embodiment of the present disclosure.

[0032] Figure 6 Shown Figure 5 Aberration curves of the imaging lens system shown.

[0033] Figure 7 is a diagram illustrating an imaging lens system according to a fourth embodiment of the present disclosure.

[0034] Figure 8 Shown Figure 7 Aberration curves of the imaging lens system shown.

[0035] Figure 9is a diagram illustrating an imaging lens system according to a fifth embodiment of the present disclosure.

[0036] Figure 10 Shown Figure 9 Aberration curves of the imaging lens system shown.

[0037] Figure 11 is a diagram illustrating an imaging lens system according to a sixth embodiment of the present disclosure.

[0038] Figure 12 Shown Figure 11 Aberration curves of the imaging lens system shown.

[0039] Figure 13 is a diagram illustrating an imaging lens system according to a seventh embodiment of the present disclosure.

[0040] Figure 14 Shown Figure 13 Aberration curves of the imaging lens system shown.

[0041] Figure 15 is a diagram illustrating an imaging lens system according to an eighth embodiment of the present disclosure.

[0042] Figure 16 Shown Figure 15 Aberration curves of the imaging lens system shown.

[0043] Figure 17 is a diagram illustrating an imaging lens system according to a ninth embodiment of the present disclosure.

[0044] Figure 18 Shown Figure 17 Aberration curves of the imaging lens system shown.

[0045] Figure 19 is a diagram illustrating an imaging lens system according to a tenth embodiment of the present disclosure.

[0046] Figure 20 Shown Figure 19 Aberration curves of the imaging lens system shown.

[0047] Figure 21 is a diagram illustrating an imaging lens system according to an eleventh embodiment of the present disclosure.

[0048] Figure 22 Shown Figure 21 Aberration curves of the imaging lens system shown.

[0049] Figure 23 is a diagram illustrating an imaging lens system according to a twelfth embodiment of the present disclosure.

[0050] Figure 24 Shown Figure 23 Aberration curves of the imaging lens system shown.

[0051] Figure 25 is a diagram illustrating an imaging lens system according to a thirteenth embodiment of the present disclosure.

[0052] Figure 26 Shown Figure 25 Aberration curves of the imaging lens system shown.

[0053] Figure 27 is a diagram illustrating an imaging lens system according to a fourteenth embodiment of the present disclosure.

[0054] Figure 28 Shown Figure 27 Aberration curves of the imaging lens system shown.

[0055] Throughout the drawings and detailed description, the same reference numerals refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative sizes, proportions, and depictions of elements in the drawings may be exaggerated. DETAILED DESCRIPTION

[0056] Hereinafter, although examples of the present disclosure will be described in detail with reference to the accompanying drawings, it should be noted that the examples are not limited thereto.

[0057] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices and / or systems described herein. However, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent after understanding the present disclosure. For example, the order of operations described herein is merely an example, and except for operations that must occur in a specific order, it is not limited to the order set forth herein, but can be changed, which will be apparent after understanding the present disclosure. In addition, for the sake of clarity and brevity, descriptions of features that are well known in the art may be omitted.

[0058] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided merely to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent after understanding the present disclosure.

[0059] Throughout the specification, when an element such as a layer, a region, or a substrate is described as being “on,” “connected to,” or “coupled to” another element, the element may be directly “on,” “connected to,” or “coupled to” the other element, or one or more other elements may be present between the element and the other element. Conversely, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, there are no other elements between the element and the other element.

[0060] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items; similarly, "at least one" includes any one of the associated listed items and any combination of any two or more items.

[0061] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are used only to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, without departing from the teachings of the examples described herein, a first member, first component, first region, first layer, or first portion mentioned in these examples may also be referred to as a second member, second component, second region, second layer, or second portion.

[0062] Spatially relative terms such as "above," "upper," "below," "lower," etc. may be used herein for descriptive convenience to describe the relationship of one element relative to another element as shown in the accompanying drawings. In addition to covering the orientations depicted in the accompanying drawings, these spatially relative terms are intended to cover different orientations of the device in use or operation. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "above" relative to another element will be "below" or "lower" relative to the other element. Thus, depending on the spatial orientation of the device, the term "above" covers both the orientations of "above" and "below." The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.

[0063] The terms used herein are for describing various examples only and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the articles "a", "an" and "the" are intended to include the plural forms as well. The terms "comprise", "include" and "have" indicate the presence of the stated features, numbers, operations, components, elements and / or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, components, elements and / or combinations thereof.

[0064] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0065] It should be noted that herein, use of the word “may” with respect to an example, for example, regarding what an example may include or implement, means that there is at least one example that includes or implements such feature, and all examples are not limited thereto.

[0066] The features of the examples described herein may be combined in various ways that will be apparent after understanding the present disclosure.In addition, although the examples described herein have various configurations, other configurations that will be apparent after understanding the present disclosure are also possible.

[0067] Embodiments of the present disclosure may provide an imaging lens system having high resolution and a wide field of view with less lens size variation compared to conventional imaging lens systems having high resolution and a wide field of view.

[0068] In an embodiment, the first lens is the lens closest to the object (or subject), and the seventh lens is the lens closest to the imaging plane (or image sensor). In an embodiment, the units of the curvature radius, thickness, TTL (the distance from the object-side surface of the first lens to the imaging plane), ImgHT (height of the imaging plane), focal length, and effective diameter are expressed in millimeters (mm).

[0069] Lens thickness, inter-lens gap, and TTL refer to the distance between the lenses on the optical axis. Furthermore, when describing a lens shape, a configuration in which one surface is convex indicates that the paraxial region of that surface is convex, while a configuration in which one surface is concave indicates that the paraxial region of that surface is concave. Therefore, even when a lens surface is described as convex, the edge of the lens may also be concave. Similarly, even when a lens surface is described as concave, the edge of the lens may also be convex.

[0070] The imaging lens system described in the embodiments can be configured to be mounted on transportation equipment. For example, the imaging lens system can be mounted on a front and / or rear surveillance camera, or an autonomous driving camera, installed on a bus, truck, fire truck, forklift, or the like. However, the embodiments of the imaging lens system are not limited to the above examples. For example, the imaging lens system can be mounted on an imaging camera on a surveillance drone or a transport drone.

[0071] An imaging lens system according to one or more embodiments may include a plurality of lenses. For example, the imaging lens system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, arranged in sequence from the object side. An imaging lens system according to one or more embodiments may include one or more lenses having a concave object side surface. For example, in an imaging lens system according to one or more embodiments, at least one of the second lens, the fourth lens, and the sixth lens may have a concave object side surface. As another example, in an imaging lens system according to one or more embodiments, two or more of the second lens, the fourth lens, and the sixth lens may have a concave object side surface. As another example, in an imaging lens system according to one or more embodiments, each of the second lens, the fourth lens, and the sixth lens may have a concave object side surface. An imaging lens system according to one or more embodiments may be configured to have a relatively wide field of view (FOV). For example, the field of view of an imaging lens system according to one or more embodiments may be 190 degrees or greater.

[0072] An imaging lens system according to one or more embodiments may include a plurality of lenses. For example, the imaging lens system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, arranged in sequence from the object side. An imaging lens system according to one or more embodiments may include one or more lenses having a concave object side surface. For example, in an imaging lens system according to one or more embodiments, at least one of the fourth lens and the sixth lens may have a concave object side surface. As another example, in an imaging lens system according to one or more embodiments, each of the fourth lens and the sixth lens may have a concave object side surface. An imaging lens system according to one or more embodiments may have a relatively low f-number. For example, the f-number of an imaging lens system according to one or more embodiments may be 1.9 or less. An imaging lens system according to one or more embodiments may be configured to have a relatively wide field of view (FOV). For example, the field of view of an imaging lens system according to one or more embodiments may be 190 degrees or greater.

[0073] An imaging lens system according to one or more embodiments may include a plurality of lenses. For example, the imaging lens system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, which are arranged in sequence from the object side. An imaging lens system according to one or more embodiments may include a lens having a negative refractive power. For example, in an imaging lens system according to one or more embodiments, the first lens and the second lens may have a negative refractive power. An imaging lens system according to one or more embodiments may include two or more lenses having a concave object side surface. For example, in an imaging lens system according to one or more embodiments, each of the fourth lens and the sixth lens may have a concave object side surface. An imaging lens system according to one or more embodiments may generally have a relatively low f-number. For example, the f-number of an imaging lens system according to one or more embodiments may be 1.9 or less.

[0074] The imaging lens system according to one or more embodiments may be configured to satisfy one or more of the following conditional expressions. For example, the imaging lens system according to one or more embodiments may include seven lenses and may satisfy at least two of the following conditional expressions. As another example, the imaging lens system according to one or more embodiments may include seven lenses and may be configured to satisfy all of the following conditional expressions. As another example, the imaging lens system according to one or more embodiments may include the characteristics of one of the imaging lens systems according to the one or more embodiments described above and may satisfy one or more of the following conditional expressions:

[0075] HFOV / L1S1ED<17.0

[0076] 0.62 <L1S1ED / TTL

[0077] 0 <f1 / f2

[0078] f1 / f3<0

[0079] -10mm <f6<0mm

[0080] 15 <V1-V3

[0081] 30 <V5-V6

[0082] 320°mm <HFOV×f

[0083] -167mm <f1234<3.1mm

[0084] 3.5mm <f567<5.0mm

[0085] -1.0 <f / f6<0

[0086] In the above conditional expressions, HFOV is the horizontal field of view of the imaging lens system, L1S1ED is the effective diameter of the object-side surface of the first lens, TTL is the distance from the object-side surface of the first lens to the imaging plane, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f6 is the focal length of the sixth lens, f1234 is the combined focal length of the first lens to the fourth lens, f567 is the combined focal length of the fifth lens to the seventh lens, V1 is the Abbe number of the first lens, V3 is the Abbe number of the third lens, V5 is the Abbe number of the fifth lens, V6 is the Abbe number of the sixth lens, and f is the focal length of the imaging lens system.

[0087] The imaging lens system according to one or more embodiments may be configured to satisfy one or more of the following conditional expressions. For example, the imaging lens system according to one or more embodiments may include seven lenses and may satisfy two or more of the following conditional expressions. As another example, the imaging lens system according to one or more embodiments may include seven lenses and may be configured to satisfy all of the following conditional expressions. As another example, the imaging lens system according to one or more embodiments may include the characteristics of one of the imaging lens systems according to the above-described one or more embodiments and may satisfy one or more of the following conditional expressions:

[0088] 330°mm <FOV×f<370°mm

[0089] -4.0 <f1 / f<-3.0

[0090] 0.6 <f1 / f2<2.0

[0091] -2.0 <f1 / f3<0

[0092] -2.0 <f1 / f4<0.1

[0093] -2.0 <f5 / f6<-1.0

[0094] 8 <V1-V3<30

[0095] 30 <V5-V6<40

[0096] 0.2 <ImgHT / TTL<0.3

[0097] 8.0 <HFOV / TTL<12.0

[0098] -168mm <f1234<23.0mm

[0099] 3.5mm <f567<7.0mm

[0100] 2.6mm <HImH<3.2mm

[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 imaging plane, FOV is the field of view of the imaging lens system, and HImH is the horizontal height of the imaging plane.

[0102] The imaging lens system according to one or more embodiments may be configured to satisfy one or more of the following conditional expressions. For example, the imaging lens system according to one or more embodiments may include seven lenses and may satisfy two or more of the following conditional expressions. As another example, the imaging lens system according to one or more embodiments may include seven lenses and may be configured to satisfy all of the following conditional expressions. As another example, the imaging lens system according to one or more embodiments may include the characteristics of one of the imaging lens systems according to the above-described one or more embodiments and may satisfy one or more of the following conditional expressions:

[0103] -3.0 <R1 / R3<-0.4

[0104] -6.0 <R3 / R4<-0.6

[0105] 0.2<(R3+R4) / (R3-R4)<0.8

[0106] 0.8<(R5+R6) / (R5-R6)<2.3

[0107] 1.0<(R7+R8) / (R7-R8)<4.0

[0108] 1.0<(T2+T3) / D23<4.0

[0109] 2.0<(T3+T4) / D34<10.0

[0110] 10<(T4+T5) / D45<40

[0111] 0.9 <T3 / D34<6.0

[0112] 5.0 <T4 / D45<18.0

[0113] 1.0 <D23 / D67<20

[0114] 0.1 <D45 / D67<3.0

[0115] In the above conditional expressions, R1 is the radius of curvature of the object-side surface of the first lens, R3 is the radius of curvature of the object-side surface of the second lens, R4 is the radius of curvature of the image-side surface of the second lens, R5 is the radius of curvature of the object-side surface of the third lens, R6 is the radius of curvature of the image-side surface of the third lens, R7 is the radius of curvature of the image-side surface of the fourth lens, R8 is the radius of curvature of the image-side surface of the fourth lens, T2 is the thickness at the optical axis center of the second lens, T3 is the thickness at the optical axis center of the third lens, T4 is the thickness at the optical axis center of the fourth lens, T5 is the thickness at the optical axis center of the fifth lens, D23 is the distance from the image-side surface of the second lens to the object-side surface of the third lens, D34 is the distance from the image-side surface of the third lens to the object-side surface of the fourth lens, D45 is the distance from the image-side surface of the fourth lens to the object-side surface of the fifth lens, and D67 is the distance from the image-side surface of the sixth lens to the object-side surface of the seventh lens.

[0116] If desired, an imaging lens system according to an embodiment may include one or more lenses having the following characteristics. For example, an imaging lens system according to one or more embodiments may include one of the first to seventh lenses having the following characteristics. As another example, multiple imaging lens systems according to one or more embodiments may include one or more of the first to seventh lenses having the following characteristics. However, an imaging lens system according to the above-described form does not necessarily include lenses having the following characteristics. The characteristics of the first to seventh lenses will be described below.

[0117] The first lens may have a refractive power. For example, the first lens may have a negative refractive power. One surface of the first lens may be convex. For example, the first lens may have a convex object-side surface. The first lens may include a spherical surface. For example, both surfaces of the first lens may be spherical. The first lens may be formed of a material having high light transmittance and excellent workability. For example, the first lens may be formed of a plastic material or a glass material. The first lens may be configured to have a predetermined refractive index. For example, the refractive index of the first lens may be greater than 1.7. As a specific example, the refractive index of the first lens may be greater than 1.72 and less than 1.84. The first lens may have a predetermined Abbe number. For example, the Abbe number of the first lens may be 40 or greater. As a specific example, the Abbe number of the first lens may be greater than 40 and less than 60.

[0118] The second lens may have a refractive power. For example, the second lens may have a negative refractive power. One surface of the second lens may be concave. For example, the second lens may have a concave object-side surface. The second lens may include an aspheric surface. For example, both surfaces of the second lens may be aspheric. The second lens may include an inflection point. For example, the inflection point may be formed on the object-side surface of the second lens. The second lens may be formed from a material having high light transmittance and excellent workability. For example, the second lens may be formed from a plastic material or a glass material. The second lens may be configured to have a predetermined refractive index. For example, the refractive index of the second lens may be greater than 1.5. As a specific example, the refractive index of the second lens may be greater than 1.52 and less than 1.62. The second lens may have a predetermined Abbe number. For example, the Abbe number of the second lens may be 50 or greater. As a specific example, the Abbe number of the second lens may be greater than 50 and less than 64.

[0119] The third lens may have a refractive power. For example, the third lens may have a positive refractive power. One surface of the third lens may be convex. For example, the third lens may have a convex image-side surface. The third lens may include an aspherical surface. For example, both surfaces of the third lens may be aspherical. The third lens may be formed from a material having high light transmittance and excellent workability. For example, the third lens may be formed from a plastic material or a glass material. The third lens may be configured to have a predetermined refractive index. For example, the refractive index of the third lens may be greater than 1.6 and less than 1.7. The third lens may have a predetermined Abbe number. For example, the Abbe number of the third lens may be greater than 20 and less than 40.

[0120] The fourth lens may have a refractive power. For example, the fourth lens may have positive or negative refractive power. One surface of the fourth lens may be concave. For example, the fourth lens may have a concave object-side surface. The fourth lens may include an aspheric surface. For example, both surfaces of the fourth lens may be aspheric. The fourth lens may include an inflection point. For example, the inflection point may be formed on the object-side surface of the fourth lens. The fourth lens may be formed from a material having high light transmittance and excellent workability. For example, the fourth lens may be formed from a plastic material or a glass material. The fourth lens may be configured to have a predetermined refractive index. For example, the refractive index of the fourth lens may be greater than 1.46 and less than 1.56. The fourth lens may have a predetermined Abbe number. For example, the Abbe number of the fourth lens may be greater than 50 and less than 64.

[0121] The fifth lens may have a refractive power. For example, the fifth lens may have a positive refractive power. One surface of the fifth lens may be convex. For example, the fifth lens may have a convex image-side surface. The fifth lens may include an aspherical surface. For example, both surfaces of the fifth lens may be aspherical. The fifth lens may be formed from a material having high light transmittance and excellent workability. For example, the fifth lens may be formed from a plastic material or a glass material. The fifth lens may be configured to have a predetermined refractive index. For example, the refractive index of the fifth lens may be greater than 1.4. As a specific example, the refractive index of the fifth lens may be greater than 1.48 and less than 1.64. The fifth lens may have a predetermined Abbe number. For example, the Abbe number of the fifth lens may be 50 or greater. As a specific example, the Abbe number of the fifth lens may be greater than 50 and less than 64.

[0122] The sixth lens may have refractive power. For example, the sixth lens may have negative refractive power. One surface of the sixth lens may be concave. As an example, the sixth lens may have a concave object-side surface. The sixth lens may include an aspherical surface. For example, both surfaces of the sixth lens may be aspherical. The sixth lens may be formed from a material having high light transmittance and excellent workability. For example, the sixth lens may be formed from a plastic material or a glass material. The sixth lens may be configured to have a predetermined refractive index. For example, the refractive index of the sixth lens may be greater than 1.60 and less than 1.74. The sixth lens may have a predetermined Abbe number. For example, the Abbe number of the sixth lens may be greater than 16 and less than 30. The sixth lens may have a stronger refractive power than the other lenses. For example, the sixth lens may have the smallest absolute value of the focal lengths of the first to seventh lenses.

[0123] The seventh lens may have a refractive power. For example, the seventh lens may have positive refractive power. One surface of the seventh lens may be convex. For example, the seventh lens may have a convex 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 formed from a material having high light transmittance and excellent workability. For example, the seventh lens may be formed from a plastic material or a glass material. The seventh lens may be configured to have a predetermined refractive index. For example, the refractive index of the seventh lens may be greater than 1.50 and less than 1.64. The seventh lens may have a predetermined Abbe number. For example, the Abbe number of the seventh lens may be greater than 50 and less than 64.

[0124] The aspherical surface of the aforementioned lens can be expressed by Equation 1.

[0125] Equation 1:

[0126]

[0127] In Equation 1, c is the inverse of the radius of curvature of the corresponding lens, k is the conic constant, r is the distance from a point on the aspherical surface to the optical axis, A to D are aspherical constants, and Z (or SAG) is the height from a point on the aspherical surface to the vertex of the aspherical surface in the optical axis direction.

[0128] The imaging lens system according to one or more of the aforementioned embodiments may further include an aperture, a filter, and a cover glass. As an example, the imaging lens system may further include an aperture disposed between the third lens and the fourth lens. The aperture may be configured to adjust the amount of light incident in the direction of the imaging plane. As another example, the imaging lens system may further include an optical filter and a cover glass disposed between the seventh lens and the imaging plane. The optical filter may be configured to block light of a specific wavelength, and the cover glass may be configured to block foreign matter from entering in the direction of the imaging plane. The optical filter described herein may be configured to block infrared rays, but may also be configured to block ultraviolet rays if desired.

[0129] Hereinafter, specific embodiments of the imaging lens system will be described with reference to the accompanying drawings.

[0130] Will refer to Figure 1 An imaging lens system according to a first embodiment is described.

[0131] 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 .

[0132] The first lens 110 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 120 may have negative refractive power and may have a concave object-side surface and a 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 positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 150 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 160 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 170 may have positive refractive power and may have a convex object-side surface and a convex image-side surface.

[0133] The imaging lens system 100 may include a lens having an inflection point. For example, the inflection point may be formed on the object-side surface of the second lens 120 in the imaging lens system 100 according to this embodiment. However, the lens in which the inflection point is formed is not limited to the second lens 120.

[0134] The imaging lens system 100 may further include a stop ST, an optical filter IF, a cover glass CG, and an imaging surface IP. The stop ST may be disposed between the third lens 130 and the fourth lens 140, and the optical filter IF and the cover glass CG may be disposed, in this order, between the seventh lens 170 and the imaging surface IP. The imaging surface IP may be formed on one surface of the image sensor IS of the camera module or in the image sensor IS.

[0135] Tables 1 and 2 list the characteristics and aspherical values ​​of the lenses of the imaging lens system according to the present embodiment, and Figure 2 Aberration curves of the imaging lens system according to the present embodiment are shown.

[0136] Table 1

[0137]

[0138]

[0139] Table 2

[0140] Face number S3 S4 S5 S6 S8 S9 k 0 0 0 0 0 0 A 1.739E-02 3.028E-02 3.757E-03 1.285E-02 1.846E-02 1.228E-03 B -2.832E-03 1.705E-05 1.055E-03 -6.083E-04 -6.337E-03 -3.674E-04 C 2.053E-04 8.705E-06 -6.701E-05 -1.339E-04 7.892E-04 -2.963E-05 D -5.396E-06 -8.959E-05 -7.083E-05 5.373E-06 -1.422E-04 0.000E+00 Face number S10 S11 S12 S13 S14 S15 k 0 0 0 0 -8.762E-01 -1.030E+01 A -6.676E-03 -1.132E-02 -5.399E-03 4.555E-03 -2.806E-03 -3.320E-03 B 7.200E-04 7.159E-03 3.918E-03 -2.389E-03 1.854E-04 8.473E-04 C 7.777E-05 -1.457E-03 -9.861E-04 4.816E-04 1.040E-05 -6.446E-05 D -1.018E-05 1.005E-04 4.242E-05 -3.977E-05 -3.741E-06 -7.610E-07

[0141] Will refer to Figure 3 An imaging lens system according to a second embodiment is described.

[0142] 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 .

[0143] The first lens 210 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 220 may have negative refractive power and may have a concave object-side surface and a 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 positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 250 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 260 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 270 may have positive refractive power and may have a convex object-side surface and a convex image-side surface.

[0144] The imaging lens system 200 may include a lens having an inflection point. For example, the inflection point may be formed on the object-side surface of the second lens 220 in the imaging lens system 200 according to this embodiment. However, the lens in which the inflection point is formed is not limited to the second lens 220.

[0145] The imaging lens system 200 may further include a stop ST, an optical filter IF, a cover glass CG, and an imaging surface IP. The stop ST may be disposed between the third lens 230 and the fourth lens 240, and the optical filter IF and the cover glass CG may be disposed, in this order, between the seventh lens 270 and the imaging surface IP. The imaging surface IP may be formed on one surface of the image sensor IS of the camera module or in the image sensor IS.

[0146] Tables 3 and 4 list the characteristics and aspherical values ​​of the lenses of the imaging lens system according to the present embodiment, and Figure 4 Aberration curves of the imaging lens system according to the present embodiment are shown.

[0147] Table 3

[0148]

[0149]

[0150] Table 4

[0151] Face number S3 S4 S5 S6 S8 S9 k 0 0 0 0 0 0 A 1.706E-02 3.017E-02 5.072E-03 1.205E-02 1.670E-02 8.562E-04 B -2.689E-03 -3.241E-04 1.332E-03 2.749E-04 -4.957E-03 -7.523E-05 C 1.891E-04 5.084E-04 -1.641E-04 -4.299E-04 4.041E-04 -8.744E-05 D -4.686E-06 -2.010E-04 -9.119E-05 2.965E-05 -1.049E-04 0.000E+00 Face number S10 S11 S12 S13 S14 S15 k 0 0 0 0 -7.237E-01 -1.541E+01 A -6.579E-03 -1.326E-02 -7.668E-03 3.565E-03 -2.606E-03 -5.910E-03 B 5.735E-04 8.382E-03 5.976E-03 -1.681E-03 2.820E-04 1.481E-03 C 7.225E-05 -1.726E-03 -1.560E-03 2.111E-04 -1.405E-05 -1.341E-04 D -5.930E-06 1.200E-04 9.371E-05 -1.299E-05 -2.104E-06 2.281E-06

[0152] Will refer to Figure 5 An imaging lens system according to a third embodiment is described.

[0153] 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 .

[0154] The first lens 310 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 320 may have negative refractive power and may have a concave object-side surface and a 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 positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 350 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 360 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 370 may have positive refractive power and may have a convex object-side surface and a convex image-side surface.

[0155] The imaging lens system 300 may include a lens having an inflection point. For example, the inflection point may be formed on the object-side surface of the second lens 320 in the imaging lens system 300 according to this embodiment. However, the lens in which the inflection point is formed is not limited to the second lens 320.

[0156] The imaging lens system 300 may further include a stop ST, an optical filter IF, a cover glass CG, and an imaging surface IP. The stop ST may be disposed between the third lens 330 and the fourth lens 340, and the optical filter IF and the cover glass CG may be disposed, in this order, between the seventh lens 370 and the imaging surface IP. The imaging surface IP may be formed on one surface of the image sensor IS of the camera module or in the image sensor IS.

[0157] Tables 5 and 6 list the characteristics and aspherical values ​​of the lenses of the imaging lens system according to the present embodiment, and Figure 6 Aberration curves of the imaging lens system according to the present embodiment are shown.

[0158] Table 5

[0159]

[0160]

[0161] Table 6

[0162] Face number S3 S4 S5 S6 S8 S9 k 0 0 0 0 0 0 A 1.678E-02 2.943E-02 5.113E-03 1.178E-02 1.609E-02 8.056E-04 B -2.568E-03 -2.137E-04 1.697E-03 6.915E-04 -4.557E-03 9.917E-05 C 1.816E-04 6.929E-04 -2.793E-04 -5.354E-04 3.441E-04 -1.505E-04 D -4.561E-06 -2.495E-04 -9.241E-05 3.816E-05 -1.128E-04 0.000E+00 Face number S10 S11 S12 S13 S14 S15 k 0 0 0 0 -7.590E-01 -1.207E+01 A -6.867E-03 -1.461E-02 -8.673E-03 3.555E-03 -2.713E-03 -6.829E-03 B 7.591E-04 9.317E-03 6.743E-03 -1.669E-03 3.144E-04 1.491E-03 C 9.178E-06 -1.920E-03 -1.723E-03 1.777E-04 -1.883E-05 -1.225E-04 D 5.503E-07 1.299E-04 9.972E-05 -1.017E-05 -2.170E-06 1.677E-06

[0163] Will refer to Figure 7 An imaging lens system according to a fourth embodiment is described.

[0164] 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 .

[0165] The first lens 410 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 420 may have negative refractive power and may have a concave object-side surface and a 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 positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 450 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 460 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 470 may have positive refractive power and may have a convex object-side surface and a convex image-side surface.

[0166] The imaging lens system 400 may include a lens having an inflection point. For example, the inflection point may be formed on the object-side surface of the second lens 420 in the imaging lens system 400 according to this embodiment. However, the lens in which the inflection point is formed is not limited to the second lens 420.

[0167] The imaging lens system 400 may further include a stop ST, an optical filter IF, a cover glass CG, and an imaging surface IP. The stop ST may be disposed between the third lens 430 and the fourth lens 440, and the optical filter IF and the cover glass CG may be disposed, in this order, between the seventh lens 470 and the imaging surface IP. The imaging surface IP may be formed on one surface of the image sensor IS of the camera module or in the image sensor IS.

[0168] Tables 7 and 8 list the characteristics and aspherical values ​​of the lenses of the imaging lens system according to the present embodiment, and Figure 8 Aberration curves of the imaging lens system according to the present embodiment are shown.

[0169] Table 7

[0170] Face number part Radius of curvature Thickness / distance Refractive index Abbe number Effective radius S1 First lens 11.8490 0.8000 1.776 49.6 5.668 S2 3.5000 2.2290 3.203 S3 Second lens -9.8320 0.8000 1.539 56.0 2.992 S4 3.7000 0.9260 1.877 S5 The third lens -29.2170 1.1190 1.842 22.3 1.837 S6 -6.7830 0.8440 1.661 S7 aperture infinity 0.3190 1.240 S8 Fourth lens -9.0460 1.8710 1.539 56.0 1.357 S9 -3.0140 0.1100 1.830 S10 Fifth lens 4.5120 2.0700 1.537 56.1 2.202 S11 -4.0510 0.1800 2.204 S12 Sixth lens -4.2330 0.8000 1.668 20.4 2.123 S13 5.2780 0.1960 2.511 S14 Seventh lens 4.8890 2.2380 1.539 56.0 2.696 S15 -5.3120 0.6000 2.850 S16 filter infinity 0.4000 1.519 64.2 2.903 S17 infinity 0.5000 2.914 S18 cover glass infinity 0.4000 1.500 67.0 2.935 S19 infinity 0.6010 2.947 S20 Imaging surface infinity 0.0000 2.984

[0171] Table 8

[0172]

[0173]

[0174] Will refer to Figure 9 An imaging lens system according to a fifth embodiment is described.

[0175] 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 .

[0176] The first lens 510 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 520 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The third lens 530 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The fourth lens 540 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 550 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 560 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 570 may have positive refractive power and may have a convex object-side surface and a convex image-side surface.

[0177] The imaging lens system 500 may include a lens having an inflection point. For example, the inflection point may be formed on the object-side surface of the second lens 520 in the imaging lens system 500 according to this embodiment. However, the lens in which the inflection point is formed is not limited to the second lens 520.

[0178] The imaging lens system 500 may further include a stop ST, an optical filter IF, a cover glass CG, and an imaging surface IP. The stop ST may be disposed between the third lens 530 and the fourth lens 540, and the optical filter IF and the cover glass CG may be disposed, in this order, between the seventh lens 570 and the imaging surface IP. The imaging surface IP may be formed on one surface of the image sensor IS of the camera module or in the image sensor IS.

[0179] Tables 9 and 10 list the characteristics and aspherical values ​​of the lenses of the imaging lens system according to the present embodiment, and Figure 10 Aberration curves of the imaging lens system according to the present embodiment are shown.

[0180] Table 9

[0181] Face number part Radius of curvature Thickness / distance Refractive index Abbe number Effective radius S1 First lens 11.8480 0.8000 1.776 49.6 5.668 S2 3.5000 2.2860 3.203 S3 Second lens -7.3030 0.8000 1.539 56.0 2.992 S4 3.7000 0.7860 1.846 S5 The third lens 15.9190 1.0840 1.669 20.4 1.790 S6 -13.1060 0.8270 1.563 S7 aperture infinity 0.3130 1.234 S8 Fourth lens -9.3920 1.8170 1.528 52.2 1.361 S9 -3.0000 0.1100 1.833 S10 Fifth lens 4.1330 2.0740 1.537 56.1 2.271 S11 -4.8040 0.1800 2.257 S12 Sixth lens -5.2510 0.8000 1.668 20.4 2.194 S13 4.4760 0.1100 2.583 S14 Seventh lens 4.3480 2.3320 1.539 56.0 2.722 S15 -5.2090 0.6000 2.856 S16 filter infinity 0.4000 1.519 64.2 2.904 S17 infinity 0.5000 2.915 S18 cover glass infinity 0.4000 1.500 67.0 2.934 S19 infinity 0.7800 2.945 S20 Imaging surface infinity 0.0000 2.981

[0182] Table 10

[0183]

[0184]

[0185] Will refer to Figure 11 An imaging lens system according to a sixth embodiment is described.

[0186] The imaging lens system 600 may include a first lens 610 , a second lens 620 , a third lens 630 , a fourth lens 640 , a fifth lens 650 , a sixth lens 660 , and a seventh lens 670 .

[0187] The first lens 610 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 620 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The third lens 630 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The fourth lens 640 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 650 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 660 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 670 may have positive refractive power and may have a convex object-side surface and a convex image-side surface.

[0188] The imaging lens system 600 may include a lens having an inflection point. For example, the inflection point may be formed on the object-side surface of the second lens 620 in the imaging lens system 600 according to this embodiment. However, the lens in which the inflection point is formed is not limited to the second lens 620.

[0189] The imaging lens system 600 may further include a stop ST, an optical filter IF, a cover glass CG, and an imaging surface IP. The stop ST may be disposed between the third lens 630 and the fourth lens 640, and the optical filter IF and the cover glass CG may be disposed, in this order, between the seventh lens 670 and the imaging surface IP. The imaging surface IP may be formed on one surface of the image sensor IS of the camera module or in the image sensor IS.

[0190] Tables 11 and 12 list the characteristics and aspherical values ​​of the lenses of the imaging lens system according to the present embodiment, and Figure 12 Aberration curves of the imaging lens system according to the present embodiment are shown.

[0191] Table 11

[0192]

[0193]

[0194] Table 12

[0195] Face number S3 S4 S5 S6 S8 S9 k 0 0 0 0 0 0 A 2.021E-02 2.226E-02 4.730E-04 1.256E-02 1.140E-02 -3.904E-04 B -2.859E-03 3.111E-03 3.959E-03 3.401E-03 6.206E-04 9.917E-04 C 2.156E-04 1.727E-04 -2.932E-04 -9.005E-04 -1.003E-03 -2.298E-04 D -6.115E-06 -2.586E-04 -2.641E-04 -4.356E-05 1.386E-04 0.000E+00 Face number S10 S11 S12 S13 S14 S15 k 0 0 0 0 -7.631E-01 -7.579E+00 A -5.890E-03 -1.914E-02 -1.232E-02 5.101E-03 1.203E-03 -3.327E-03 B 1.229E-03 1.176E-02 8.895E-03 -2.769E-03 -1.505E-03 8.488E-04 C -2.715E-04 -2.667E-03 -2.300E-03 2.819E-04 2.413E-04 -5.874E-05 D 2.505E-05 1.958E-04 1.615E-04 -1.558E-05 -1.578E-05 3.846E-07

[0196] Will refer to Figure 13 An imaging lens system according to a seventh embodiment is described.

[0197] The imaging lens system 700 may include a first lens 710 , a second lens 720 , a third lens 730 , a fourth lens 740 , a fifth lens 750 , a sixth lens 760 , and a seventh lens 770 .

[0198] The first lens 710 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 720 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The third lens 730 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The fourth lens 740 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 750 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 760 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 770 may have positive refractive power and may have a convex object-side surface and a convex image-side surface.

[0199] The imaging lens system 700 may include a lens having an inflection point. For example, the inflection point may be formed on the object-side surface of the second lens 720 in the imaging lens system 700 according to this embodiment. However, the lens in which the inflection point is formed is not limited to the second lens 720.

[0200] The imaging lens system 700 may further include a stop ST, an optical filter IF, a cover glass CG, and an imaging surface IP. The stop ST may be disposed between the third lens 730 and the fourth lens 740, and the optical filter IF and the cover glass CG may be disposed, in this order, between the seventh lens 770 and the imaging surface IP. The imaging surface IP may be formed on one surface of the image sensor IS of the camera module or in the image sensor IS.

[0201] Tables 13 and 14 list the characteristics and aspherical values ​​of the lenses of the imaging lens system according to the present embodiment, and Figure 14 Aberration curves of the imaging lens system according to the present embodiment are shown.

[0202] Table 13

[0203]

[0204]

[0205] Table 14

[0206] Face number S3 S4 S5 S6 S8 S9 k 0 0 0 0 0 0 A 1.733E-02 1.777E-02 1.709E-03 1.129E-02 1.164E-02 2.204E-03 B -2.402E-03 2.306E-03 2.064E-03 3.172E-03 1.680E-03 1.613E-04 C 1.960E-04 1.960E-04 1.304E-04 -1.080E-03 -1.628E-03 -9.213E-05 D -6.090E-06 -1.818E-04 -2.263E-04 3.442E-05 2.638E-04 0.000E+00 Face number S10 S11 S12 S13 S14 S15 k 0 0 0 0 -6.829E-01 -9.522E+00 A -3.264E-03 -1.223E-02 -1.057E-02 -1.845E-03 -1.372E-04 -2.086E-03 B 1.667E-05 7.366E-03 7.528E-03 6.213E-04 -6.547E-04 8.044E-04 C -1.711E-04 -2.047E-03 -2.078E-03 -2.791E-04 9.709E-05 -8.544E-05 D 3.227E-05 1.816E-04 1.521E-04 1.718E-05 -7.497E-06 3.506E-06

[0207] Will refer to Figure 15 An imaging lens system according to an eighth embodiment is described.

[0208] The imaging lens system 800 may include a first lens 810 , a second lens 820 , a third lens 830 , a fourth lens 840 , a fifth lens 850 , a sixth lens 860 , and a seventh lens 870 .

[0209] The first lens 810 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 820 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The third lens 830 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fourth lens 840 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 850 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 860 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 870 may have positive refractive power and may have a convex object-side surface and a convex image-side surface.

[0210] The imaging lens system 800 may include a lens having an inflection point. For example, the inflection point may be formed on the object-side surface of the second lens 820 in the imaging lens system 800 according to this embodiment. However, the lens in which the inflection point is formed is not limited to the second lens 820.

[0211] The imaging lens system 800 may further include an aperture ST, an optical filter IF, a cover glass CG, and an imaging plane IP. The aperture ST may be disposed between the third lens 830 and the fourth lens 840, and the optical filter IF and the cover glass CG may be disposed, in this order, between the seventh lens 870 and the imaging plane IP. The imaging plane IP may be formed on one surface of the image sensor IS of the camera module or in the image sensor IS.

[0212] Tables 15 and 16 list the characteristics and aspherical values ​​of the lenses of the imaging lens system according to the present embodiment, and Figure 16 Aberration curves of the imaging lens system according to the present embodiment are shown.

[0213] Table 15

[0214]

[0215]

[0216] Table 16

[0217] Face number S3 S4 S5 S6 S8 S9 k 0 0 0 0 0 0 A 1.714E-02 2.656E-02 3.927E-03 1.100E-02 1.447E-02 2.723E-04 B -2.454E-03 -3.511E-04 2.986E-03 2.756E-03 -2.501E-03 6.934E-04 C 1.738E-04 1.181E-03 -3.942E-04 -1.128E-03 -2.259E-04 -2.928E-04 D -4.440E-06 -3.435E-04 -1.659E-04 3.958E-05 -9.447E-05 0.000E+00 Face number S10 S11 S12 S13 S14 S15 k 0 0 0 0 -3.496E-01 -1.320E+01 A -6.037E-03 -1.651E-02 -1.055E-02 4.254E-03 -2.504E-03 -8.972E-03 B 1.178E-03 1.018E-02 7.218E-03 -1.261E-03 7.681E-04 1.656E-03 C -1.750E-04 -2.006E-03 -1.770E-03 3.323E-05 -1.209E-04 -1.256E-04 D 1.167E-05 1.187E-04 1.005E-04 1.287E-07 4.427E-06 2.719E-06

[0218] Will refer to Figure 17 An imaging lens system according to a ninth embodiment is described.

[0219] The imaging lens system 900 may include a first lens 910 , a second lens 920 , a third lens 930 , a fourth lens 940 , a fifth lens 950 , a sixth lens 960 , and a seventh lens 970 .

[0220] The first lens 910 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 920 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The third lens 930 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fourth lens 940 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 950 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 960 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 970 may have positive refractive power and may have a convex object-side surface and a convex image-side surface.

[0221] The imaging lens system 900 may include a lens having an inflection point. For example, the inflection point may be formed on the object-side surface of the second lens 920 in the imaging lens system 900 according to this embodiment. However, the lens in which the inflection point is formed is not limited to the second lens 920.

[0222] The imaging lens system 900 may further include an aperture ST, an optical filter IF, a cover glass CG, and an imaging surface IP. The aperture ST may be disposed between the third lens 930 and the fourth lens 940, and the optical filter IF and the cover glass CG may be disposed, in this order, between the seventh lens 970 and the imaging surface IP. The imaging surface IP may be formed on one surface of the image sensor IS of the camera module or in the image sensor IS.

[0223] Table 17 and Table 18 list the characteristics and aspherical values ​​of the lenses of the imaging lens system according to the present embodiment, and Figure 18 Aberration curves of the imaging lens system according to the present embodiment are shown.

[0224] Table 17

[0225]

[0226]

[0227] Table 18

[0228] Face number S3 S4 S5 S6 S8 S9 k 0 0 0 0 0 0 A 1.455E-02 1.453E-02 -1.637E-02 1.071E-03 -1.011E-02 -4.816E-03 B -1.995E-04 4.628E-03 9.205E-04 5.053E-03 7.075E-03 -1.031E-04 C -7.218E-05 -1.053E-03 7.493E-04 -1.116E-03 -1.963E-03 3.313E-04 D 3.334E-06 4.013E-05 -1.411E-06 2.327E-04 2.854E-04 -2.544E-05 Face number S10 S11 S12 S13 S14 S15 k 0 0 0 0 -7.875E-01 -1.321E+01 A 4.591E-03 5.500E-03 -6.637E-04 -7.140E-04 -6.128E-05 -6.598E-03 B -2.689E-03 -3.952E-03 1.537E-03 3.918E-04 -7.145E-04 5.261E-03 C 6.058E-04 8.485E-04 -4.890E-04 -1.737E-04 9.087E-05 -9.455E-04 D -4.912E-05 -5.339E-05 4.222E-05 8.208E-06 -1.563E-06 6.070E-05

[0229] Will refer to Figure 19 An imaging lens system according to a tenth embodiment is described.

[0230] The imaging lens system 1000 may include a first lens 1010 , a second lens 1020 , a third lens 1030 , a fourth lens 1040 , a fifth lens 1050 , a sixth lens 1060 , and a seventh lens 1070 .

[0231] The first lens 1010 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 1020 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The third lens 1030 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fourth lens 1040 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 1050 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 1060 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 1070 may have positive refractive power and may have a convex object-side surface and a convex image-side surface.

[0232] The imaging lens system 1000 may include a lens having an inflection point. For example, the inflection point may be formed on the object-side surface of the second lens 1020 in the imaging lens system 1000 according to this embodiment. However, the lens in which the inflection point is formed is not limited to the second lens 1020.

[0233] The imaging lens system 1000 may further include a stop ST, an optical filter IF, a cover glass CG, and an imaging plane IP. The stop ST may be disposed between the third lens 1030 and the fourth lens 1040, and the optical filter IF and the cover glass CG may be disposed, in this order, between the seventh lens 1070 and the imaging plane IP. The imaging plane IP may be formed on one surface of the image sensor IS of the camera module or in the image sensor IS.

[0234] Tables 19 and 20 list the characteristics and aspherical values ​​of the lenses of the imaging lens system according to the present embodiment, and Figure 20 Aberration curves of the imaging lens system according to the present embodiment are shown.

[0235] Table 19

[0236]

[0237]

[0238] Table 20

[0239] Face number S3 S4 S5 S6 S8 S9 k 0 0 0 0 0 0 A 1.714E-02 2.047E-02 -1.453E-02 8.078E-03 3.166E-03 -1.381E-03 B -7.459E-04 5.499E-04 1.465E-03 5.776E-03 2.778E-03 -8.062E-04 C -3.600E-07 3.429E-04 1.286E-04 -2.153E-03 -1.914E-03 2.258E-04 D 7.156E-07 -9.675E-05 0.000E+00 5.753E-04 1.464E-04 -7.060E-05 Face number S10 S11 S12 S13 S14 S15 k 0 0 0 0 -1.242E+00 -8.753E+00 A 4.375E-04 -1.660E-02 -1.762E-02 -6.011E-03 -1.507E-03 -6.502E-03 B -8.415E-04 1.108E-02 1.472E-02 2.950E-03 1.550E-04 4.053E-03 C -3.008E-05 -2.595E-03 -3.440E-03 -5.961E-04 -5.044E-05 -6.669E-04 D 3.239E-05 2.402E-04 2.795E-04 3.420E-05 3.820E-06 3.478E-05

[0240] Will refer to Figure 21 An imaging lens system according to an eleventh embodiment is described.

[0241] The imaging lens system 1100 may 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 .

[0242] The first lens 1110 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 1120 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The third lens 1130 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fourth lens 1140 may have negative refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 1150 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 1160 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 1170 may have positive refractive power and may have a convex object-side surface and a convex image-side surface.

[0243] The imaging lens system 1100 may include a lens having an inflection point. For example, the inflection point may be formed on the object-side surface of the second lens 1120 in the imaging lens system 1100 according to this embodiment. However, the lens in which the inflection point is formed is not limited to the second lens 1120.

[0244] The imaging lens system 1100 may further include a stop ST, an optical filter IF, a cover glass CG, and an imaging plane IP. The stop ST may be disposed between the third lens 1130 and the fourth lens 1140, and the optical filter IF and the cover glass CG may be disposed, in this order, between the seventh lens 1170 and the imaging plane IP. The imaging plane IP may be formed on one surface of the image sensor IS of the camera module or in the image sensor IS.

[0245] Table 21 and Table 22 list the characteristics and aspherical values ​​of the lenses of the imaging lens system according to the present embodiment, and Figure 22 Aberration curves of the imaging lens system according to the present embodiment are shown.

[0246] Table 21

[0247] Face number part Radius of curvature Thickness / distance Refractive index Abbe number Effective radius S1 First lens 12.5950 0.8000 1.776 49.6 6.191 S2 3.8970 2.2400 3.566 S3 Second lens -19.9430 0.8000 1.539 56.0 3.347 S4 3.7000 1.6050 2.002 S5 The third lens -9.8970 2.8000 1.666 39.5 1.980 S6 -3.3830 0.6440 2.022 S7 aperture infinity 0.1510 1.484 S8 Fourth lens -20.5660 0.8350 1.504 56.4 1.574 S9 -21.0000 0.1100 1.734 S10 Fifth lens 2.9300 1.9380 1.537 56.1 1.935 S11 -3.8000 0.1800 1.865 S12 Sixth lens -4.0720 0.8000 1.668 20.4 1.781 S13 3.6100 0.1100 1.996 S14 Seventh lens 3.2910 1.6560 1.539 56.0 2.122 S15 -17.1090 0.6000 2.244 S16 filter infinity 0.4000 1.519 64.2 2.507 S17 infinity 0.5000 2.598 S18 cover glass infinity 0.4000 1.500 67.0 2.777 S19 infinity 0.4320 2.870 S20 Imaging surface infinity 0.0000 3.028

[0248] Table 22

[0249]

[0250]

[0251] Will refer to Figure 23 An imaging lens system according to a twelfth embodiment is described.

[0252] The imaging lens system 1200 may include a first lens 1210 , a second lens 1220 , a third lens 1230 , a fourth lens 1240 , a fifth lens 1250 , a sixth lens 1260 , and a seventh lens 1270 .

[0253] The first lens 1210 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 1220 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The third lens 1230 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fourth lens 1240 may have negative refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 1250 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 1260 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 1270 may have positive refractive power and may have a convex object-side surface and a convex image-side surface.

[0254] The imaging lens system 1200 may include a lens having an inflection point. For example, the inflection point may be formed on the object-side surface of the second lens 1220 in the imaging lens system 1200 according to this embodiment. However, the lens in which the inflection point is formed is not limited to the second lens 1220.

[0255] The imaging lens system 1200 may further include a stop ST, an optical filter IF, a cover glass CG, and an imaging plane IP. The stop ST may be disposed between the third lens 1230 and the fourth lens 1240, and the optical filter IF and the cover glass CG may be disposed, in this order, between the seventh lens 1270 and the imaging plane IP. The imaging plane IP may be formed on one surface of the image sensor IS of the camera module or in the image sensor IS.

[0256] Table 23 and Table 24 list the characteristics and aspherical values ​​of the lenses of the imaging lens system according to the present embodiment, and Figure 24 Aberration curves of the imaging lens system according to the present embodiment are shown.

[0257] Table 23

[0258] Face number part Radius of curvature Thickness / distance Refractive index Abbe number Effective radius S1 First lens 12.4870 0.8000 1.776 49.6 6.146 S2 3.8650 2.2390 3.536 S3 Second lens -18.4860 0.8000 1.539 56.0 3.316 S4 3.7000 1.5700 1.985 S5 The third lens -9.8620 2.8000 1.660 39.9 1.963 S6 -3.3500 0.6010 2.002 S7 aperture infinity 0.1510 1.490 S8 Fourth lens -20.5660 0.8350 1.504 56.4 1.584 S9 -23.0000 0.1100 1.742 S10 Fifth lens 2.9120 1.9990 1.537 56.1 1.940 S11 -3.8000 0.1800 1.869 S12 Sixth lens -4.0330 0.8000 1.668 20.4 1.786 S13 3.6250 0.1100 2.024 S14 Seventh lens 3.2800 1.6960 1.539 56.0 2.174 S15 -15.6010 0.6000 2.274 S16 filter infinity 0.4000 1.519 64.2 2.528 S17 infinity 0.5000 2.617 S18 cover glass infinity 0.4000 1.500 67.0 2.790 S19 infinity 0.4090 2.880 S20 Imaging surface infinity 0.0000 3.025

[0259] Table 24

[0260]

[0261]

[0262] Will refer to Figure 25 An imaging lens system according to a thirteenth embodiment is described.

[0263] The imaging lens system 1300 may include a first lens 1310 , a second lens 1320 , a third lens 1330 , a fourth lens 1340 , a fifth lens 1350 , a sixth lens 1360 , and a seventh lens 1370 .

[0264] The first lens 1310 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 1320 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The third lens 1330 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fourth lens 1340 may have negative refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 1350 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 1360 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 1370 may have positive refractive power and may have a convex object-side surface and a convex image-side surface.

[0265] The imaging lens system 1300 may include a lens having an inflection point. For example, the inflection point may be formed on the object-side surface of the second lens 1320 in the imaging lens system 1300 according to this embodiment. However, the lens in which the inflection point is formed is not limited to the second lens 1320.

[0266] The imaging lens system 1300 may further include a stop ST, an optical filter IF, a cover glass CG, and an imaging plane IP. The stop ST may be disposed between the third lens 1330 and the fourth lens 1340, and the optical filter IF and the cover glass CG may be disposed, in this order, between the seventh lens 1370 and the imaging plane IP. The imaging plane IP may be formed on one surface of the image sensor IS of the camera module or in the image sensor IS.

[0267] Table 25 and Table 26 list the characteristics and aspherical values ​​of the lenses of the imaging lens system according to the present embodiment, and Figure 26 Aberration curves of the imaging lens system according to the present embodiment are shown.

[0268] Table 25

[0269] Face number part Radius of curvature Thickness / distance Refractive index Abbe number Effective radius S1 First lens 12.4720 0.8000 1.776 49.6 6.159 S2 3.8760 2.2500 3.546 S3 Second lens -18.3660 0.8000 1.539 56.0 3.325 S4 3.7000 1.5680 1.990 S5 The third lens -9.6010 2.8000 1.660 39.8 1.972 S6 -3.3240 0.6350 2.023 S7 aperture infinity 0.1510 1.491 S8 Fourth lens -20.5660 0.8000 1.504 56.4 1.585 S9 -23.0000 0.1100 1.733 S10 Fifth lens 2.9180 1.9820 1.537 56.1 1.926 S11 -3.8000 0.1800 1.860 S12 Sixth lens -4.0270 0.8000 1.668 20.4 1.780 S13 3.6150 0.1100 2.014 S14 Seventh lens 3.2920 1.6990 1.539 56.0 2.167 S15 -14.9630 0.6000 2.267 S16 filter infinity 0.4000 1.519 64.2 2.523 S17 infinity 0.5000 2.612 S18 cover glass infinity 0.4000 1.500 67.0 2.787 S19 infinity 0.4160 2.877 S20 Imaging surface infinity 0.0000 3.025

[0270] Table 26

[0271]

[0272]

[0273] Will refer to Figure 27 An imaging lens system according to a fourteenth embodiment is described.

[0274] The imaging lens system 1400 may include a first lens 1410 , a second lens 1420 , a third lens 1430 , a fourth lens 1440 , a fifth lens 1450 , a sixth lens 1460 , and a seventh lens 1470 .

[0275] The first lens 1410 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The second lens 1420 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The third lens 1430 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fourth lens 1440 may have negative refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 1450 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 1460 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 1470 may have positive refractive power and may have a convex object-side surface and a convex image-side surface.

[0276] The imaging lens system 1400 may include a lens having an inflection point. For example, the inflection point may be formed on the object-side surface of the second lens 1420 in the imaging lens system 1400 according to this embodiment. However, the lens in which the inflection point is formed is not limited to the second lens 1420.

[0277] The imaging lens system 1400 may further include a stop ST, an optical filter IF, a cover glass CG, and an imaging plane IP. The stop ST may be disposed between the third lens 1430 and the fourth lens 1440, and the optical filter IF and the cover glass CG may be disposed, in this order, between the seventh lens 1470 and the imaging plane IP. The imaging plane IP may be formed on one surface of the image sensor IS of the camera module or in the image sensor IS.

[0278] Table 27 and Table 28 list the characteristics and aspherical values ​​of the lenses of the imaging lens system according to the present embodiment, and Figure 28 Aberration curves of the imaging lens system according to the present embodiment are shown.

[0279] Table 27

[0280]

[0281]

[0282] Table 28

[0283] Face number S3 S4 S5 S6 S8 S9 k 0 0 0 0 0 0 A 5.992E-01 5.063E-01 -7.999E-02 1.132E-01 1.377E-01 -3.205E-02 B -8.299E-02 8.385E-02 5.809E-03 -6.267E-03 -1.336E-02 -5.186E-03 C -1.651E-03 1.427E-02 -7.555E-04 6.046E-04 8.894E-04 8.761E-04 D 2.021E-03 1.749E-03 3.800E-05 -5.900E-05 -1.437E-04 Face number S10 S11 S12 S13 S14 S15 k 0 0 0 0 -1.017E+00 -9.900E+01 A -1.919E-01 2.652E-03 -7.567E-02 -6.634E-02 -1.240E-01 -6.256E-02 B 1.088E-02 4.592E-04 -8.525E-03 -3.737E-04 3.675E-02 4.778E-02 C 1.419E-03 8.800E-05 -2.626E-03 -4.256E-03 -5.427E-03 3.306E-03 D 6.519E-04 1.122E-03 2.572E-04 8.701E-04 9.956E-04 2.681E-04

[0284] Tables 29 to 31 are optical characteristic values ​​and conditional expression values ​​of the imaging lens systems according to the first to fourteenth embodiments.

[0285] Table 29

[0286]

[0287]

[0288] Table 30

[0289]

[0290] Table 31

[0291]

[0292] According to the aforementioned embodiments, an imaging lens system having a relatively wide field of view and a relatively low f-number can be realized.

[0293] Although specific examples have been shown and described above, it will be apparent after understanding this disclosure that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be understood in a descriptive sense only and not for purposes of limitation. The description of features or aspects in each example should be considered applicable to similar features or aspects in other examples. Appropriate results may still be achieved if the described techniques are performed in a different order, and / or if components in the described systems, architectures, devices, or circuits are combined in different ways and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of this disclosure is not limited by the 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. Imaging lens system, including: A first lens element having negative refractive power; a second lens element having negative refractive power and a concave object-side surface; The third lens has positive refractive power; a fourth lens having a concave object-side surface; a fifth lens element having positive refractive power; a sixth lens element having negative refractive power and a concave object-side surface; as well as The seventh lens has positive refractive power. Wherein, the first lens to the seventh lens are arranged in sequence from the object side, wherein the field of view of the imaging lens system is 190 degrees or greater, The imaging lens system includes seven lenses in total, and Wherein, the imaging lens system satisfies the following conditional expression: 0.2 < ImgHT / TTL < 0.3, and -3.0 < R1 / R3 < -0.4, Wherein, ImgHT is the height of the imaging plane, TTL is the distance from the object side surface of the first lens to the imaging plane, R1 is the curvature radius of the object side surface of the first lens, and R3 is the curvature radius of the object side surface of the second lens.

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

3. The imaging lens system according to claim 1, wherein: The third lens has a convex image-side surface.

4. The imaging lens system according to claim 1, wherein: The fifth lens element has a convex object-side surface.

5. The imaging lens system according to claim 1, wherein: The seventh lens element has a convex object-side surface.

6. The imaging lens system according to claim 1, wherein: The following conditional expressions are met: 0 < f1 / f2, Wherein, f1 is the focal length of the first lens, and f2 is the focal length of the second lens.

7. The imaging lens system according to claim 1, wherein: The following conditional expressions are met: f1 / f3 < 0, Wherein, f1 is the focal length of the first lens, and f3 is the focal length of the third lens.

8. The imaging lens system according to claim 1, wherein: The following conditional expressions are met: 15 < V1-V3, Wherein, V1 is the Abbe number of the first lens, and V3 is the Abbe number of the third lens.

9. The imaging lens system according to claim 1, wherein: The following conditional expressions are met: 30 < V5-V6, Wherein, V5 is the Abbe number of the fifth lens, and V6 is the Abbe number of the sixth lens.

10. The imaging lens system according to claim 1, wherein: The following conditional expressions are met: -168 mm < f1234 < 23.0 mm, Wherein, f1234 is the combined focal length of the first to fourth lenses.

11. The imaging lens system according to claim 1 , wherein: The following conditional expressions are met: 3.5 mm < f567 < 7.0 mm, Wherein, f567 is the combined focal length of the fifth lens to the seventh lens.

12. Imaging lens system, comprising: A first lens element having negative refractive power; The second lens has negative refractive power; The third lens has positive refractive power; a fourth lens having a concave object-side surface; a fifth lens element having positive refractive power; a sixth lens element having negative refractive power and a concave object-side surface; as well as The seventh lens has positive refractive power. Wherein, the first lens to the seventh lens are arranged in sequence from the object side, Wherein, the imaging lens system f-number is equal to or less than 1.9, and FOV is equal to or greater than 190 degrees, wherein FOV is the field of view of the imaging lens system, The imaging lens system includes seven lenses in total, and Wherein, the imaging lens system satisfies the following conditional expression: 0.2 < ImgHT / TTL < 0.3, and -3.0 < R1 / R3 < -0.4, Wherein, ImgHT is the height of the imaging plane, TTL is the distance from the object side surface of the first lens to the imaging plane, R1 is the curvature radius of the object side surface of the first lens, and R3 is the curvature radius of the object side surface of the second lens.

13. The imaging lens system according to claim 12, wherein: The third lens has a convex image-side surface.

14. The imaging lens system according to claim 12, wherein: The following conditional expressions are met: 330 °mm < FOV×f < 370 °mm, Wherein, f is the focal length of the imaging lens system.

15. The imaging lens system according to claim 12, wherein: The following conditional expressions are met: 0.6 < f1 / f2 < 2.0, Wherein, f1 is the focal length of the first lens, and f2 is the focal length of the second lens.

16. Imaging lens system, comprising: A first lens element having negative refractive power and a convex object-side surface; a second lens element having negative refractive power and a concave object-side surface; The third lens has positive refractive power and a convex image-side surface; a fourth lens having a concave object-side surface; A fifth lens element having positive refractive power and a convex image-side surface; a sixth lens element having negative refractive power and a concave object-side surface; as well as The seventh lens has positive refractive power and a convex object side surface. Wherein, the first lens to the seventh lens are arranged in sequence from the object side, The imaging lens system includes seven lenses in total, and Wherein, the imaging lens system satisfies the following conditional expression: 0.2 < ImgHT / TTL < 0.3, and -3.0 < R1 / R3 < -0.4, Wherein, ImgHT is the height of the imaging plane, TTL is the distance from the object side surface of the first lens to the imaging plane, R1 is the curvature radius of the object side surface of the first lens, and R3 is the curvature radius of the object side surface of the second lens.

17. The imaging lens system according to claim 16, wherein: The fourth lens has positive refractive power.

18. The imaging lens system according to claim 16, wherein: The fourth lens has negative refractive power.

19. The imaging lens system according to claim 16, wherein: The imaging lens system f-number is equal to or less than 1.9, and the field of view of the imaging lens system is equal to or greater than 190 degrees.

Images