CN115508990A

CN115508990A - Imaging lens system

Info

Publication number: CN115508990A
Application number: CN202211380497.5A
Authority: CN
Inventors: 李多睿
Original assignee: Samsung Electro Mechanics Co Ltd
Current assignee: Samsung Electro Mechanics Co Ltd
Priority date: 2022-05-25
Filing date: 2022-10-31
Publication date: 2022-12-23

Abstract

The imaging lens system includes: a first lens having a refractive power, a second lens having a concave object-side surface, 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 this order from the object side, and wherein a field of view of the imaging lens system is 190 degrees or more.

Description

Imaging lens system

Cross Reference to Related Applications

This application claims the benefit of priority of korean patent application No. 10-2022-0064176, filed in korean intellectual property office at 25.5.2022, the entire disclosure of which is incorporated herein by reference for all purposes.

Technical Field

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

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 the vehicle to provide the driver with object information located in front of and behind the vehicle. Since it may be important for a vehicle camera to accurately recognize objects around the vehicle and provide information to a driver, an imaging lens system having high resolution performance and a wide field of view may be necessary. However, it may not be easy to install an imaging lens system having high resolution and a wide field of view in a vehicle camera due to a limitation of a setting position. For example, to implement a vehicle camera having a relatively low f-number, it may be necessary to increase the diameters of the front lens and other lenses, but it may be difficult to change the lens size due to structural and design limitations of vehicle components (e.g., bumpers) on which the camera is provided.

The above information is presented merely as background information to aid in understanding the present disclosure. No determination is made as to whether any of the above can be used as prior art with respect to the present disclosure, nor is an assertion made.

Disclosure of Invention

This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. 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.

In one general aspect, an imaging lens system includes: a first lens having a refractive power, a second lens having a concave object-side surface, 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 order from the object side, and wherein a field of view of the imaging lens system is 190 degrees or more.

The first lens may have a convex object side.

The third lens may have a convex image side.

The fifth lens may have a convex object side.

The seventh lens may have a convex object side.

The following conditional expression may be satisfied: 0< -f 1/f2, where f1 is the focal length of the first lens, and f2 is the focal length of the second lens.

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.

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

The following conditional expression may be satisfied: 30-V5-V6, wherein V5 is the Abbe number of the fifth lens and V6 is the Abbe number of the sixth lens.

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

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

In another general aspect, an 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 this order from the object side, and wherein an f-number of the imaging lens system is equal to or less than 1.9, and a field of view (FOV) of the imaging lens system is equal to or greater than 190 degrees.

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

The following conditional expression may be satisfied: 0.6< -f 1/f2<2.0, where f1 is the focal length of the first lens and f2 is the focal length of the second lens.

The following conditional expression may be satisfied: -3.0 sR1/R3 < -0.4, wherein 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.

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

The fourth lens may have a positive refractive power.

The fourth lens may have a negative refractive power.

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.

Other features and aspects will become apparent from the following claims, the accompanying drawings, and the following detailed description.

Drawings

Fig. 1 is a diagram illustrating an imaging lens system according to a first embodiment of the present disclosure.

Fig. 2 shows an aberration curve of the imaging lens system shown in fig. 1.

Fig. 3 is a diagram illustrating an imaging lens system according to a second embodiment of the present disclosure.

Fig. 4 shows an aberration curve of the imaging lens system shown in fig. 3.

Fig. 5 is a diagram illustrating an imaging lens system according to a third embodiment of the present disclosure.

Fig. 6 shows an aberration curve of the imaging lens system shown in fig. 5.

Fig. 7 is a diagram illustrating an imaging lens system according to a fourth embodiment of the present disclosure.

Fig. 8 shows an aberration curve of the imaging lens system shown in fig. 7.

Fig. 9 is a diagram illustrating an imaging lens system according to a fifth embodiment of the present disclosure.

Fig. 10 shows an aberration curve of the imaging lens system shown in fig. 9.

Fig. 11 is a diagram illustrating an imaging lens system according to a sixth embodiment of the present disclosure.

Fig. 12 shows an aberration curve of the imaging lens system shown in fig. 11.

Fig. 13 is a diagram illustrating an imaging lens system according to a seventh embodiment of the present disclosure.

Fig. 14 shows an aberration curve of the imaging lens system shown in fig. 13.

Fig. 15 is a diagram illustrating an imaging lens system according to an eighth embodiment of the present disclosure.

Fig. 16 shows an aberration curve of the imaging lens system shown in fig. 15.

Fig. 17 is a diagram illustrating an imaging lens system according to a ninth embodiment of the present disclosure.

Fig. 18 shows an aberration curve of the imaging lens system shown in fig. 17.

Fig. 19 is a diagram illustrating an imaging lens system according to a tenth embodiment of the present disclosure.

Fig. 20 shows an aberration curve of the imaging lens system shown in fig. 19.

Fig. 21 is a diagram illustrating an imaging lens system according to an eleventh embodiment of the present disclosure.

Fig. 22 shows an aberration curve of the imaging lens system shown in fig. 21.

Fig. 23 is a diagram illustrating an imaging lens system according to a twelfth embodiment of the present disclosure.

Fig. 24 shows an aberration curve of the imaging lens system shown in fig. 23.

Fig. 25 is a diagram illustrating an imaging lens system according to a thirteenth embodiment of the present disclosure.

Fig. 26 shows an aberration curve of the imaging lens system shown in fig. 25.

Fig. 27 is a diagram illustrating an imaging lens system according to a fourteenth embodiment of the present disclosure.

Fig. 28 shows an aberration curve of the imaging lens system shown in fig. 27.

Like reference numerals refer to like elements throughout the drawings and detailed description. The figures may not be drawn to scale and the relative sizes, proportions and depictions of the elements in the figures may be exaggerated for clarity, illustration and convenience.

Detailed Description

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.

The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, apparatuses, and/or systems described herein. Various changes, modifications, and equivalents of the methods, devices, and/or systems described herein will, however, be apparent after understanding the present disclosure. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, except as operations that must occur in a particular order, but may be varied as will be apparent upon understanding the present disclosure. In addition, descriptions of features well known in the art may be omitted for greater clarity and conciseness.

The features described herein may be embodied 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, apparatuses, and/or systems described herein that will be apparent after understanding the present disclosure.

Throughout the specification, when an element such as a layer, region or substrate is described as being "on," "connected to" or "coupled to" another element, it can 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. In contrast, when an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element, there are no other elements intervening between the element and the other element.

As used herein, the term "and/or" includes any one of the associated listed items as well as any combination of any two or more items; likewise, "at least one" includes any one of the associated listed items as well as any combination of any two or more of the items.

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

Spatially relative terms such as "above 8230; \8230", "above", "below", "8230", and the like may be used herein for convenience of description to describe the relationship of one element to another element as illustrated in the figures. These spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "upper" relative to another element would then be oriented "below" or "lower" relative to the other element. Thus, the phrase "over" encompasses both orientations of "over" and "under", depending on the spatial orientation of the device, 8230 \8230 @. The device may also be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative terms used herein should be interpreted accordingly.

The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. The articles "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" specify the presence of stated features, integers, operations, elements, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, operations, elements, components, and/or groups thereof.

Variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, may be expected. Thus, examples described herein are not limited to the specific shapes shown in the drawings, but include changes in shape that occur during manufacture.

It should be noted that use of the word "may" with respect to an example herein, such as with respect to what an example may include or implement, means that there is at least one example in which such feature is included or implemented, and all examples are not so limited.

The features of the examples described herein may be combined in various ways that will be apparent after understanding the present disclosure. Further, while the examples described herein have a variety of configurations, other configurations are possible as will be apparent after understanding the present disclosure.

Embodiments of the present disclosure may provide an imaging lens system with a high resolution and a wide field of view with less lens size variation than conventional imaging lens systems with high resolution and a wide field of view.

In an embodiment, the first lens refers to a lens closest to an object (or subject), and the seventh lens refers to a lens closest to an imaging plane (or image sensor). In an embodiment, the unit of the radius of curvature, the thickness, TTL (distance from the object side surface of the first lens to the imaging surface), imgHT (height of the imaging surface), the focal length, and the effective diameter is expressed in millimeters (mm).

The thickness of the lenses, the gap between the lenses, and TTL refer to the distance of the lenses on the optical axis. Further, in the description of the shape of the lens, a configuration in which one surface is convex means that the paraxial region of the surface is convex, and a configuration in which one surface is concave means that the paraxial region of the surface is concave. Thus, even when one surface of the lens is described as convex, the edge of the lens may be concave. Similarly, even when it is described that one surface of the lens is concave, the edge of the lens may be convex.

The imaging lens system described in the embodiment may be configured to be mounted on a transportation apparatus. For example, the imaging lens system may be mounted on a front monitoring camera and/or a rear monitoring camera or an autonomous driving camera provided on a passenger car, truck, fire truck, forklift, or the like. However, the embodiment of the imaging lens system is not limited to the above example. For example, the imaging lens system may be mounted on an imaging camera of a surveillance drone or a transport drone.

The 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 this order 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 more.

The 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 this order 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. The imaging lens system according to one or more embodiments may have a relatively low f-number. For example, the f-number of the 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 more.

The 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 this order 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 negative refractive power. An imaging lens system according to one or more embodiments may include two or more lenses having concave object-side surfaces. 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. The imaging lens system according to one or more embodiments may generally have a relatively low f-number. For example, the f-number of the 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 satisfy one or more conditional expressions as follows. 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 a characteristic of one of the imaging lens systems according to one or more embodiments described above, and may satisfy one or more conditional expressions of:

HFOV/L1S1ED<17.0

0.62<L1S1ED/TTL

0<f1/f2

f1/f3<0

-10mm<f6<0mm

15<V1-V3

30<V5-V6

320°mm<HFOV×f

-167mm<f1234<3.1mm

3.5mm<f567<5.0mm

-1.0<f/f6<0

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 imaging surface, 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.

An imaging lens system according to one or more embodiments may be configured to satisfy one or more conditional expressions as follows. For example, the imaging lens system according to one or more embodiments may include seven lenses, and two or more of the following conditional expressions may be satisfied. 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 a characteristic of one of the imaging lens systems according to one or more embodiments described above, and may satisfy one or more conditional expressions of:

330°mm<FOV×f<370°mm

-4.0<f1/f<-3.0

0.6<f1/f2<2.0

-2.0<f1/f3<0

-2.0<f1/f4<0.1

-2.0<f5/f6<-1.0

8<V1-V3<30

30<V5-V6<40

0.2<ImgHT/TTL<0.3

8.0<HFOV/TTL<12.0

-168mm<f1234<23.0mm

3.5mm<f567<7.0mm

2.6mm<HImH<3.2mm

in the above conditional expression, f4 is a focal length of the fourth lens, f5 is a focal length of the fifth lens, imgHT is a height of the imaging plane, FOV is a field of view of the imaging lens system, and HImH is a horizontal height of the imaging plane.

-3.0<R1/R3<-0.4

-6.0<R3/R4<-0.6

0.2<(R3+R4)/(R3-R4)<0.8

0.8<(R5+R6)/(R5-R6)<2.3

1.0<(R7+R8)/(R7-R8)<4.0

1.0<(T2+T3)/D23<4.0

2.0<(T3+T4)/D34<10.0

10<(T4+T5)/D45<40

0.9<T3/D34<6.0

5.0<T4/D45<18.0

1.0<D23/D67<20

0.1<D45/D67<3.0

in the above conditional expressions, R1 is a radius of curvature of an object-side surface of the first lens, R3 is a radius of curvature of an object-side surface of the second lens, R4 is a radius of curvature of an image-side surface of the second lens, R5 is a radius of curvature of an object-side surface of the third lens, R6 is a radius of curvature of an image-side surface of the third lens, R7 is a radius of curvature of an image-side surface of the fourth lens, R8 is a radius of curvature of an image-side surface of the fourth lens, T2 is a thickness at an optical axis center of the second lens, T3 is a thickness at an optical axis center of the third lens, T4 is a thickness at an optical axis center of the fourth lens, T5 is a thickness at an optical axis center of the fifth lens, 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 object-side surface of the sixth lens.

The imaging lens system according to the embodiment may include one or more lenses having the following characteristics, if necessary. For example, the 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, the plurality of 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, the imaging lens system according to the above form does not necessarily include a lens having the following characteristics. Hereinafter, characteristics of the first to seventh lenses will be described.

The first lens may have an optical 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. 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 more. As a specific example, the abbe number of the first lens may be greater than 40 and less than 60.

The second lens may have an optical 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 aspherical. The second lens may include an inflection point. For example, an inflection point may be formed on the object side of the second lens. The second lens may be formed of a material having high light transmittance and excellent workability. For example, the second lens may be formed of a plastic material or a glass material. The second lens may be configured to have a predetermined refractive index. For example, the refractive index of the second lens may be greater than 1.5. 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 more. As a specific example, the abbe number of the second lens may be more than 50 and less than 64.

The third lens may have an optical 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. The third lens may include an aspheric surface. For example, both surfaces of the third lens may be aspherical. The third lens may be formed of a material having high light transmittance and excellent workability. For example, the third lens may be formed of a plastic material or a glass material. The third lens may be configured to have a predetermined refractive index. For example, the refractive index of the third lens may be greater than 1.6 and less than 1.7. The third lens may have a predetermined abbe number. For example, the third lens may have an abbe number greater than 20 and less than 40.

The fourth lens may have an optical power. For example, the fourth lens may have a positive refractive power or a 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 aspherical. The fourth lens may include an inflection point. For example, an inflection point may be formed on the object-side surface of the fourth lens. The fourth lens may be formed of a material having high light transmittance and excellent workability. For example, the fourth lens may be formed of a plastic material or a glass material. The fourth lens may be configured to have a predetermined refractive index. For example, the refractive index of the fourth lens may be greater than 1.46 and less than 1.56. The fourth lens may have a predetermined abbe number. For example, the abbe number of the fourth lens may be more than 50 and less than 64.

The fifth lens may have an optical 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. The fifth lens may include an aspheric surface. For example, both surfaces of the fifth lens may be aspherical. The fifth lens may be formed of a material having high light transmittance and excellent workability. For example, the fifth lens may be formed of a plastic material or a glass material. The fifth lens may be configured to have a predetermined refractive index. For example, the refractive index of the fifth lens may be greater than 1.4. 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 more. As a specific example, the abbe number of the fifth lens may be greater than 50 and less than 64.

The sixth lens may have an optical power. For example, the sixth lens may have a negative refractive power. One surface of the sixth lens may be concave. As an example, the sixth lens may have a concave object side surface. The sixth lens may include an aspheric surface. For example, both surfaces of the sixth lens may be aspherical. The sixth lens may be formed of a material having high light transmittance and excellent workability. For example, the sixth lens may be formed of a plastic material or a glass material. The sixth lens may be configured to have a predetermined refractive index. For example, the refractive index of the sixth lens may be greater than 1.60 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 more 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 a minimum absolute value of focal lengths of the first to seventh lenses.

The seventh lens may have an optical power. For example, the seventh lens may have a positive refractive power. One surface of the seventh lens may be convex. For example, the seventh lens may have a convex object side. 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 of a material having high light transmittance and excellent workability. For example, the seventh lens may be formed of a plastic material or a glass material. The seventh lens may be configured to have a predetermined refractive index. For example, the refractive index of the seventh lens may be greater than 1.50 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 more than 50 and less than 64.

The aspherical surface of the aforementioned lens can be represented by equation 1.

Equation 1:

in equation 1, c is the reciprocal of the radius of curvature of the corresponding lens, k is a 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 in the optical axis direction from a point on the aspherical surface to the vertex of the aspherical surface.

The imaging lens system according to one or more of the foregoing embodiments may further include a diaphragm, a filter, and a cover glass. As an example, the imaging lens system may further include a stop disposed between the third lens and the fourth lens. The diaphragm may be configured to adjust an amount of light incident in a direction of the imaging plane. As another example, the imaging lens system may further include a cover glass and a filter disposed between the seventh lens and the imaging plane. The 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 a direction of the imaging plane. The filters described herein may be configured to block infrared rays, but may also be configured to block ultraviolet rays, if desired.

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

An imaging lens system according to a first embodiment will be described with reference to fig. 1.

The imaging lens system 100 may include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, and a seventh lens 170.

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

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

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

Table 1 and table 2 list characteristics and aspherical surface values of the lens of the imaging lens system according to the present embodiment, and fig. 2 shows an aberration curve of the imaging lens system according to the present embodiment.

TABLE 1

TABLE 2

Noodle numbering

S3

S4

S5

S6

S8

S9

k

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

Noodle number

S10

S11

S12

S13

S14

S15

k

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

An imaging lens system according to a second embodiment will be described with reference to fig. 3.

The imaging lens system 200 may include a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, a sixth lens 260, and a seventh lens 270.

The first lens 210 may have a negative refractive power, and may have a convex object-side surface and a concave image-side surface. The second lens 220 may have a negative refractive power, and may have a concave object-side surface and a concave image-side surface. The third lens 230 may have a positive refractive power, and may have a concave object-side surface and a convex image-side surface. Fourth lens 240 may have a positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 250 may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. The sixth lens 260 may have a negative refractive power, and may have a concave object-side surface and a concave image-side surface. The seventh lens 270 may have positive refractive power, and may have a convex object-side surface and a convex image-side surface.

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

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

Table 3 and table 4 list the characteristics and aspherical values of the lens of the imaging lens system according to the present embodiment, and fig. 4 shows an aberration curve of the imaging lens system according to the present embodiment.

TABLE 3

TABLE 4

Noodle numbering

S3

S4

S5

S6

S8

S9

k

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

Noodle numbering

S10

S11

S12

S13

S14

S15

k

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

An imaging lens system according to a third embodiment will be described with reference to fig. 5.

The imaging lens system 300 may include a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, a sixth lens 360, and a seventh lens 370.

The first lens 310 may have a negative refractive power, and may have a convex object-side surface and a concave image-side surface. The second lens 320 may have a negative refractive power and may have a concave object-side surface and a concave image-side surface. The third lens 330 may have a positive refractive power, and may have a concave object-side surface and a convex image-side surface. The fourth lens 340 may have a positive refractive power, and may have a concave object-side surface and a convex image-side surface. Fifth lens 350 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 360 may have a negative refractive power, and may have a concave object-side surface and a concave image-side surface. The seventh lens 370 may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface.

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

The imaging lens system 300 may further include a diaphragm ST, a filter IF, a cover glass CG and an imaging plane IP. The stop ST may be disposed between the third lens 330 and the fourth lens 340, and the filter IF and the cover glass CG may be disposed between the seventh lens 370 and the imaging plane IP in this order. 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.

Tables 5 and 6 list characteristics and aspherical values of lenses of the imaging lens system according to the present embodiment, and fig. 6 shows aberration curves of the imaging lens system according to the present embodiment.

TABLE 5

TABLE 6

Noodle numbering

S3

S4

S5

S6

S8

S9

k

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

Noodle numbering

S10

S11

S12

S13

S14

S15

k

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

An imaging lens system according to a fourth embodiment will be described with reference to fig. 7.

The imaging lens system 400 may include a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, a sixth lens 460, and a seventh lens 470.

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

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

The imaging lens system 400 may further include a diaphragm ST, a filter IF, a cover glass CG and an imaging plane IP. A stop ST may be disposed between the third lens 430 and the fourth lens 440, and a filter IF and a cover glass CG may be disposed between the seventh lens 470 and the imaging plane IP in this order. 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.

Tables 7 and 8 list characteristics and aspherical values of lenses of the imaging lens system according to the present embodiment, and fig. 8 shows aberration curves of the imaging lens system according to the present embodiment.

TABLE 7

Noodle numbering	Component 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	Third lens	-29.2170	1.1190	1.842	22.3	1.837
S6		-6.7830	0.8440			1.661
							S7	Diaphragm	Infinity(s)	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 element	4.5120	2.0700	1.537	56.1	2.202
							S11		-4.0510	0.1800			2.204
S12	Sixth lens element	-4.2330	0.8000	1.668	20.4	2.123
							S13		5.2780	0.1960			2.511
S14	Seventh lens element	4.8890	2.2380	1.539	56.0	2.696
							S15		-5.3120	0.6000			2.850
S16	Light filter	Infinity(s)	0.4000	1.519	64.2	2.903
							S17		Infinity(s)	0.5000			2.914
S18	Cover glass	Infinity(s)	0.4000	1.500	67.0	2.935
							S19		Infinity(s)	0.6010			2.947
S20	Image plane	Infinity(s)	0.0000			2.984

TABLE 8

An imaging lens system according to a fifth embodiment will be described with reference to fig. 9.

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.

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

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

The imaging lens system 500 may further include a diaphragm ST, a filter IF, a cover glass CG and an imaging plane IP. A stop ST may be disposed between the third lens 530 and the fourth lens 540, and a filter IF and a cover glass CG may be disposed between the seventh lens 570 and the imaging plane IP in this order. 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.

Tables 9 and 10 list characteristics and aspherical values of lenses of the imaging lens system according to the present embodiment, and fig. 10 shows aberration curves of the imaging lens system according to the present embodiment.

TABLE 9

Noodle numbering	Component 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	Third lens	15.9190	1.0840	1.669	20.4	1.790
S6		-13.1060	0.8270			1.563
							S7	Diaphragm	Infinity(s)	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 element	4.1330	2.0740	1.537	56.1	2.271
							S11		-4.8040	0.1800			2.257
S12	Sixth lens element	-5.2510	0.8000	1.668	20.4	2.194
							S13		4.4760	0.1100			2.583
S14	Seventh lens element	4.3480	2.3320	1.539	56.0	2.722
							S15		-5.2090	0.6000			2.856
S16	Light filter	Infinity(s)	0.4000	1.519	64.2	2.904
							S17		Infinity(s)	0.5000			2.915
S18	Cover glass	Infinity(s)	0.4000	1.500	67.0	2.934
							S19		Infinity(s)	0.7800			2.945
S20	Image plane	Infinity(s)	0.0000			2.981

TABLE 10

An imaging lens system according to a sixth embodiment will be described with reference to fig. 11.

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.

The first lens 610 may have a negative refractive power, and may have a convex object-side surface and a concave image-side surface. Second lens 620 may have a 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. Fifth lens 650 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 660 may have a negative refractive power, and may have a concave object-side surface and a concave image-side surface. The seventh lens 670 may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface.

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

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

Table 11 and table 12 list the characteristics and aspherical values of the lens of the imaging lens system according to the present embodiment, and fig. 12 shows an aberration curve of the imaging lens system according to the present embodiment.

TABLE 11

TABLE 12

Noodle number

S3

S4

S5

S6

S8

S9

k

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

Noodle number

S10

S11

S12

S13

S14

S15

k

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

An imaging lens system according to a seventh embodiment will be described with reference to fig. 13.

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

The first lens 710 may have a negative refractive power, and may have a convex object-side surface and a concave image-side surface. The second lens 720 may have a negative refractive power and may have a concave object-side surface and a concave image-side surface. The third lens 730 may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. Fourth lens 740 may have a positive optical power and may have a concave object-side surface and a convex image-side surface. The fifth lens 750 may have a positive refractive power, and may have a convex object-side surface and a convex image-side surface. Sixth lens 760 may have a negative refractive power and may have a concave object-side surface and a concave image-side surface. The seventh lens 770 may have a positive refractive power and may have a convex object side surface and a convex image side surface.

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

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

Tables 13 and 14 list characteristics and aspherical values of lenses of the imaging lens system according to the present embodiment, and fig. 14 shows aberration curves of the imaging lens system according to the present embodiment.

Watch 13

TABLE 14

Noodle numbering

S3

S4

S5

S6

S8

S9

k

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

1.304E-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

Noodle numbering

S10

S11

S12

S13

S14

S15

k

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

An imaging lens system according to an eighth embodiment will be described with reference to fig. 15.

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

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

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

The imaging lens system 800 may further include a diaphragm ST, a filter IF, a cover glass CG and an imaging plane IP. A stop ST may be disposed between the third lens 830 and the fourth lens 840, and a filter IF and a cover glass CG may be disposed between the seventh lens 870 and the imaging plane IP in this order. 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.

Tables 15 and 16 list characteristics and aspherical values of lenses of the imaging lens system according to the present embodiment, and fig. 16 shows aberration curves of the imaging lens system according to the present embodiment.

Watch 15

TABLE 16

Noodle numbering

S3

S4

S5

S6

S8

S9

k

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

Noodle number

S10

S11

S12

S13

S14

S15

k

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

An imaging lens system according to a ninth embodiment will be described with reference to fig. 17.

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

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

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

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

Table 17 and table 18 list characteristics and aspherical surface values of the lens of the imaging lens system according to the present embodiment, and fig. 18 shows an aberration curve of the imaging lens system according to the present embodiment.

TABLE 17

Watch 18

Noodle numbering

S3

S4

S5

S6

S8

S9

k

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

Noodle numbering

S10

S11

S12

S13

S14

S15

k

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

An imaging lens system according to a tenth embodiment will be described with reference to fig. 19.

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

The first lens 1010 may have a negative refractive power, and may have a convex object-side surface and a concave image-side surface. The second lens 1020 may have a negative refractive power and may have a concave object-side surface and a concave image-side surface. Third lens 1030 may have a positive refractive power, and may have a concave object-side surface and a convex image-side surface. Fourth lens 1040 may have a positive refractive power and may have a concave object side surface and a convex image side surface. Fifth lens 1050 may have positive power and may have a convex object-side surface and a convex image-side surface. The sixth lens 1060 may have a negative refractive power, and may have a concave object-side surface and a concave image-side surface. Seventh lens 1070 may have a positive refractive power and may have a convex object side surface and a convex image side surface.

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

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

Tables 19 and 20 list characteristics and aspherical surface values of the lens of the imaging lens system according to the present embodiment, and fig. 20 shows aberration curves of the imaging lens system according to the present embodiment.

Watch 19

Watch 20

Noodle numbering

S3

S4

S5

S6

S8

S9

k

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

Noodle numbering

S10

S11

S12

S13

S14

S15

k

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

An imaging lens system according to an eleventh embodiment will be described with reference to fig. 21.

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.

The first lens 1110 may have a negative refractive power, and may have a convex object-side surface and a concave image-side surface. The second lens 1120 may have a negative refractive power, and may have a concave object-side surface and a concave image-side surface. The third lens 1130 may have a positive refractive power, and may have a concave object-side surface and a convex image-side surface. The fourth lens 1140 may have a 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 a negative refractive power, and may have a concave object-side surface and a concave image-side surface. The seventh lens 1170 may have positive power and may have a convex object side surface and a convex image side surface.

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

The imaging lens system 1100 may further include a diaphragm ST, a filter IF, a cover glass CG and an imaging plane IP. A stop ST may be disposed between the third lens 1130 and the fourth lens 1140, and a filter IF and a cover glass CG may be disposed between the seventh lens 1170 and the imaging plane IP in this order. 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.

Tables 21 and 22 list characteristics and aspherical values of lenses of the imaging lens system according to the present embodiment, and fig. 22 shows aberration curves of the imaging lens system according to the present embodiment.

TABLE 21

Noodle number	Component 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	Third lens	-9.8970	2.8000	1.666	39.5	1.980
S6		-3.3830	0.6440			2.022
							S7	Diaphragm	Infinity(s)	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 element	2.9300	1.9380	1.537	56.1	1.935
							S11		-3.8000	0.1800			1.865
S12	Sixth lens element	-4.0720	0.8000	1.668	20.4	1.781
							S13		3.6100	0.1100			1.996
S14	Seventh lens element	3.2910	1.6560	1.539	56.0	2.122
							S15		-17.1090	0.6000			2.244
S16	Light filter	Infinity(s)	0.4000	1.519	64.2	2.507
							S17		Infinity(s)	0.5000			2.598
S18	Cover glass	Infinity(s)	0.4000	1.500	67.0	2.777
							S19		Infinity(s)	0.4320			2.870
S20	Image plane	Infinity(s)	0.0000			3.028

TABLE 22

An imaging lens system according to a twelfth embodiment will be described with reference to fig. 23.

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.

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

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

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

Tables 23 and 24 list characteristics and aspherical values of lenses of the imaging lens system according to the present embodiment, and fig. 24 shows aberration curves of the imaging lens system according to the present embodiment.

TABLE 23

Noodle number	Component 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	Third lens	-9.8620	2.8000	1.660	39.9	1.963
S6		-3.3500	0.6010			2.002
							S7	Diaphragm	Infinity(s)	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 element	2.9120	1.9990	1.537	56.1	1.940
							S11		-3.8000	0.1800			1.869
S12	Sixth lens element	-4.0330	0.8000	1.668	20.4	1.786
							S13		3.6250	0.1100			2.024
S14	Seventh lens element	3.2800	1.6960	1.539	56.0	2.174
							S15		-15.6010	0.6000			2.274
S16	Light filter	Infinity(s)	0.4000	1.519	64.2	2.528
							S17		Infinity(s)	0.5000			2.617
S18	Cover glass	Infinity(s)	0.4000	1.500	67.0	2.790
							S19		Infinity(s)	0.4090			2.880
S20	Image plane	Infinity(s)	0.0000			3.025

Watch 24

An imaging lens system according to a thirteenth embodiment will be described with reference to fig. 25.

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.

The first lens 1310 may have a negative refractive power, and may have a convex object-side surface and a concave image-side surface. The second lens 1320 may have a negative refractive power, and may have a concave object-side surface and a concave image-side surface. The third lens 1330 may have a positive refractive power, and may have a concave object-side surface and a convex image-side surface. Fourth lens 1340 may have a negative refractive power and may have a concave object-side surface and a convex image-side surface. Fifth lens 1350 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. 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 a positive refractive power, and may have a convex object-side surface and a convex image-side surface.

The imaging lens system 1300 may include a lens with an inflection point. For example, an inflection point may be formed on the object side of the second lens 1320 in the imaging lens system 1300 according to the present embodiment. However, the lens in which the inflection point is formed is not limited to the second lens 1320.

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

Tables 25 and 26 list characteristics and aspherical values of lenses of the imaging lens system according to the present embodiment, and fig. 26 shows aberration curves of the imaging lens system according to the present embodiment.

TABLE 25

Noodle number	Component 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	Third lens	-9.6010	2.8000	1.660	39.8	1.972
S6		-3.3240	0.6350			2.023
							S7	Diaphragm	Infinity(s)	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 element	2.9180	1.9820	1.537	56.1	1.926
							S11		-3.8000	0.1800			1.860
S12	Sixth lens element	-4.0270	0.8000	1.668	20.4	1.780
							S13		3.6150	0.1100			2.014
S14	Seventh lens element	3.2920	1.6990	1.539	56.0	2.167
							S15		-14.9630	0.6000			2.267
S16	Light filter	Infinity(s)	0.4000	1.519	64.2	2.523
							S17		Infinity(s)	0.5000			2.612
S18	Cover glass	Infinity(s)	0.4000	1.500	67.0	2.787
							S19		Infinity(s)	0.4160			2.877
S20	Image plane	Infinity(s)	0.0000			3.025

Watch 26

An imaging lens system according to a fourteenth embodiment will be described with reference to fig. 27.

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.

The first lens 1410 may have a negative refractive power, and may have a convex object-side surface and a concave image-side surface. The second lens 1420 may have a 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 a negative refractive power and may have a concave object-side surface and a convex image-side surface. Fifth lens 1450 may have positive refractive power and may have a convex object side surface and a convex image side surface. 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.

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

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

Tables 27 and 28 list characteristics and aspherical values of lenses of the imaging lens system according to the present embodiment, and fig. 28 shows aberration curves of the imaging lens system according to the present embodiment.

Watch 27

Watch 28

Noodle numbering

S3

S4

S5

S6

S8

S9

k

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

Noodle numbering

S10

S11

S12

S13

S14

S15

k

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

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

TABLE 29

Watch 30

Watch 31

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

While specific examples have been illustrated and described above, it will be apparent, upon understanding the present 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 considered 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. Suitable 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 a different manner and/or replaced or supplemented by other components or their equivalents. Therefore, the scope of the present disclosure is defined not by the specific embodiments but by the claims and their equivalents, and all modifications within the scope of the claims and their equivalents should be understood as being included in the present disclosure.

Claims

1. An imaging lens system comprising:

a first lens having a 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 a refractive power,

wherein the first lens to the seventh lens are arranged in order from an object side,

wherein a field of view of the imaging lens system is 190 degrees or more, an

Wherein the imaging lens system comprises a total of seven lenses.

2. The imaging lens system of claim 1, wherein the first lens has a convex object side.

3. The imaging lens system of claim 1, wherein the third lens has a convex image side.

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

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

6. The imaging lens system according to claim 1, wherein the following conditional expression is satisfied:

0<f1/f2，

wherein f1 is a focal length of the first lens, and f2 is a focal length of the second lens.

7. The imaging lens system according to claim 1, wherein the following conditional expression is satisfied:

f1/f3<0，

wherein f1 is a focal length of the first lens, and f3 is a focal length of the third lens.

8. The imaging lens system according to claim 1, wherein the following conditional expression is satisfied:

15<V1-V3，

wherein V1 is an abbe number of the first lens, and V3 is an abbe number of the third lens.

9. The imaging lens system according to claim 1, wherein the following conditional expression is satisfied:

30<V5-V6，

wherein V5 is an abbe number of the fifth lens, and V6 is an abbe number of the sixth lens.

10. The imaging lens system according to claim 1, wherein the following conditional expression is satisfied:

-168mm<f1234<23.0mm，

wherein f1234 is a combined focal length of the first lens to the fourth lens.

11. The imaging lens system according to claim 1, wherein the following conditional expression is satisfied:

3.5mm<f567<7.0mm，

wherein f567 is a combined focal length of the fifth lens to the seventh lens.

12. An imaging lens system comprising:

a first lens having a refractive power;

a second lens having refractive power;

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 a refractive power,

wherein an f-number of the imaging lens system is equal to or less than 1.9 and a FOV is equal to or greater than 190 degrees, wherein the FOV is a field of view of the imaging lens system, and wherein the imaging lens system comprises a total of seven lenses.

13. The imaging lens system of claim 12, wherein the third lens has a convex image side.

14. The imaging lens system according to claim 12, wherein the following conditional expression is satisfied:

330°mm<FOV×f<370°mm，

wherein f is a focal length of the imaging lens system.

15. The imaging lens system according to claim 12, wherein the following conditional expression is satisfied:

0.6<f1/f2<2.0，

16. The imaging lens system according to claim 12, wherein the following conditional expression is satisfied:

-3.0<R1/R3<-0.4，

wherein R1 is a radius of curvature of an object side surface of the first lens, and R3 is a radius of curvature of an object side surface of the second lens.

17. An imaging lens system comprising:

a first lens having a negative refractive power and a convex object-side surface;

a second lens having a negative refractive power and a concave object-side surface;

a third lens having a positive refractive power and a convex image side surface;

a fourth lens having a concave object-side surface;

a fifth lens having positive refractive power and a convex image side surface;

a sixth lens having a negative refractive power and a concave object-side surface; and

a seventh lens having a positive refractive power and a convex object-side surface,

wherein the first lens to the seventh lens are arranged in order from an object side, an

Wherein the imaging lens system comprises a total of seven lenses.

18. The imaging lens system of claim 17, wherein the fourth lens has a positive refractive power.

19. The imaging lens system of claim 17, wherein the fourth lens has a negative refractive power.

20. The imaging lens system of claim 17, wherein an f-number of the imaging lens system is equal to or less than 1.9 and a field of view of the imaging lens system is equal to or greater than 190 degrees.