CN117192751A - Imaging lens system - Google Patents

Abstract

The imaging lens system includes: a first lens having a negative refractive power, a second lens having a refractive power, a third lens having a refractive power, a fourth lens having a positive refractive power, a fifth lens having a concave object side, a sixth lens having a convex object side, a seventh lens having a refractive power, and an eighth lens having a refractive power, wherein the first lens to the eighth lens are disposed in order from the object side at intervals, wherein the imaging lens system satisfies the following conditional expression: 0.170< ImgHT/TTL <0.182, wherein ImgHT is the height of the imaging plane and TTL is the distance from the object side of the first lens to the imaging plane.

Description

Imaging lens system

Cross Reference to Related Applications

The present application claims the benefit of priority from korean patent application No. 10-2022-0125draw 64 filed at the korean intellectual property office at 9 and 30 of 2022 and korean patent application No. 10-2022-0157883 filed at the korean intellectual property office at 11 and 23 of 2022, the entire disclosures of which are incorporated herein by reference for all purposes.

Technical Field

The present disclosure relates to imaging lens systems that can be used over a wide temperature range.

Background

Vehicles may include cameras to minimize personal and property damage due to traffic accidents. For example, one or more cameras may be mounted on front and rear bumpers of a vehicle to provide information to a driver regarding objects located in front of and behind the vehicle. As described above, since the vehicle camera is provided on the bumper of the vehicle, the vehicle camera may be affected by the external environment. For example, a high temperature environment in summer and a low temperature environment in winter may significantly reduce the performance and resolution of a vehicle camera. In addition, intense ultraviolet light incident through a lens of a vehicle camera may change the optical performance or physical characteristics of some lenses (e.g., lenses formed of plastic). Therefore, there is a need to develop a camera capable of minimizing performance degradation caused by external environment and ultraviolet rays and an imaging lens system suitable for the camera.

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

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 negative refractive power, a second lens having a refractive power, a third lens having a refractive power, a fourth lens having a positive refractive power, a fifth lens having a concave object side, a sixth lens having a convex object side, a seventh lens having a refractive power, and an eighth lens having a refractive power, wherein the first lens to the eighth lens are sequentially arranged from the object side, wherein the imaging lens system satisfies the following conditional expression: 0.170< ImgHT/TTL <0.182, wherein ImgHT is the height of the imaging plane and TTL is the distance from the object side of the first lens to the imaging plane.

The imaging lens system may satisfy the following conditional expression: 0.70< f/f4<0.90, where f is the focal length of the imaging lens system and f4 is the focal length of the fourth lens.

The imaging lens system may satisfy the following conditional expression: L1D1/TTL <0.350, where L1D1 is the effective diameter of the object side of the first lens.

The imaging lens system may satisfy the following conditional expression: f1/f2<0, where f1 is the focal length of the first lens and f2 is the focal length of the second lens.

The imaging lens system may satisfy the following conditional expression: f5/f6<0, where f5 is the focal length of the fifth lens and f6 is the focal length of the sixth lens.

The imaging lens system may satisfy the following conditional expression: 4.50< TTL/f <4.90, where f is the focal length of the imaging lens system.

The imaging lens system may satisfy the following conditional expression: L1D1/ImgHT <2.0, wherein L1D1 is the effective diameter of the object side of the first lens.

The f-number may be less than 1.7.

In another general aspect, an imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens disposed in order from an object side at intervals, wherein the first lens and the fifth lens each have a negative refractive power, the sixth lens has a convex object side, and wherein the imaging lens system satisfies the following conditional expression: 15.0< V3/(nd1+nd4) <17.0, where Nd1 is the refractive index of the first lens, nd4 is the refractive index of the fourth lens, and V3 is the abbe number of the third lens.

The imaging lens system may satisfy the following conditional expression: 1.60< L1D 1/imgsht <2.0, where L1D1 is the effective diameter of the object side of the first lens and imgsht is the height of the imaging plane.

The imaging lens system may satisfy the following conditional expression: 0.009< |f/R1| <0.090, where f is the focal length of the imaging lens system and R1 is the radius of curvature of the object side of the first lens.

The imaging lens system may satisfy the following conditional expression: 0.002< |r2/r1| <0.080, where R1 is the radius of curvature of the object side surface of the first lens and R2 is the radius of curvature of the image side surface of the first lens.

The imaging lens system may satisfy the following conditional expression: 0.80< |r5/r6| <1.40, where R5 is the radius of curvature of the object-side surface of the third lens and R6 is the radius of curvature of the image-side surface of the third lens.

The imaging lens system may satisfy the following conditional expression: 12< V4/(nd1+nd4) <15, where V4 is the abbe number of the fourth lens.

The imaging lens system may satisfy the following conditional expression: 2.3< (nd1+nd4)/Ndmin, wherein Ndmin is the minimum value of the refractive indices of the first lens to the eighth lens.

The imaging lens system may satisfy the following conditional expression: 59< V1/Nd2+V4/Nd5<62, where V1 is the Abbe number of the first lens, V4 is the Abbe number of the fourth lens, nd2 is the refractive index of the second lens, and Nd5 is the refractive index of the fifth lens.

In another general aspect, an imaging lens system includes: a first lens having a negative refractive power and a refractive index of more than 1.74 and less than 1.90, a second lens having a positive refractive power, a third lens having a positive refractive power, a fourth lens having a positive refractive power and a refractive index of more than 1.70 and less than 1.84, a fifth lens having a negative refractive power, a sixth lens having a positive refractive power, a seventh lens having a negative refractive power, and an eighth lens having a positive refractive power, wherein the first lens to the eighth lens are disposed in order from the object side at intervals.

The first lens may have a concave image side and the second lens may have a convex image side.

The third lens may have a concave object side, the fourth lens may have a convex object side, the fifth lens may have a concave object side, and the sixth lens may have a convex object side.

The seventh lens may have a concave image side surface and the eighth lens may have a convex object side surface.

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

Drawings

Fig. 1 is a configuration diagram of an imaging lens system according to a first exemplary embodiment.

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

Fig. 3 is a configuration diagram of an imaging lens system according to a second exemplary embodiment.

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

Fig. 5 is a configuration diagram of an imaging lens system according to a third exemplary embodiment.

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

Fig. 7 is a configuration diagram of an imaging lens system according to a fourth exemplary embodiment.

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

Fig. 9 is a configuration diagram of an imaging lens system according to a fifth exemplary embodiment.

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

Fig. 11 is a configuration diagram of an imaging lens system according to a sixth exemplary embodiment.

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

Fig. 13 is a configuration diagram of an imaging lens system according to a seventh exemplary embodiment.

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

Fig. 15 is a configuration diagram of an imaging lens system according to an eighth exemplary embodiment.

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

Fig. 17 is a configuration diagram of an imaging lens system according to a ninth exemplary embodiment.

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

Fig. 19 is a configuration diagram of an imaging lens system according to a tenth exemplary embodiment.

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

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 elements in the figures may be exaggerated for clarity, illustration, and convenience.

Detailed Description

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

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

The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, apparatus, and/or systems described herein. However, various alterations, modifications and equivalents of the methods, devices and/or systems described herein will be apparent upon an understanding of this disclosure. For example, the order of the operations described herein is merely an example, and is not limited to the order set forth herein except for operations that must occur in a particular order, but may be altered as will be apparent upon an understanding of the disclosure. In addition, descriptions of features well known in the art may be omitted for the sake of 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 solely to illustrate some of the many possible ways of implementing the methods, devices, and/or systems described herein that will be apparent after an understanding of 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, the element may be directly on," directly "connected to," or directly "coupled to" the other element, or there may be one or more other elements interposed 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 elements present.

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

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 should not be 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 … …," "upper," "below … …," "lower," and the like may be used herein for convenience of description to describe one element's relationship to another element as illustrated in the figures. In addition to the orientations depicted in the drawings, these spatially relative terms are intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is turned over, elements described as "on" or "above" relative to another element would then be oriented "under" or "below" the other element. Thus, the expression "above … …" encompasses both orientations "above" and "below" depending on the spatial orientation of the device. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein 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 also include the plural forms 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, and/or groups thereof.

In describing the present disclosure below, terms related to the components of the present disclosure are named in consideration of the function of each component, and thus should not be construed as limiting the technical components of the present disclosure.

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

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

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

Exemplary embodiments provide an imaging lens system capable of minimizing degradation of a lens caused by ultraviolet rays while having a wide operating temperature range.

In an example, the first lens refers to a lens closest to the object (or subject), and the eighth lens refers to a lens closest to the imaging plane (or image sensor). In an example, the unit of radius of curvature, thickness, TTL (distance from the object side surface of the first lens to the imaging surface), imgo (height of the imaging surface), and unit of effective radius are expressed in millimeters (mm).

The thickness of the lenses, the distance between the lenses, and TTL refer to the distance of the lenses along the optical axis. Further, in the description of the lens shape, a configuration in which one surface is convex means that the optical axis area of the surface is convex, and a configuration in which one surface is concave means that the optical axis area of the surface is concave. Therefore, even when one surface of the lens is described as being convex, the edge of the lens may be concave. Similarly, even when one surface of the lens is described as being concave, the edge of the lens may be convex.

The imaging lens systems described herein may be configured to be mounted on a transmission device. For example, the imaging lens system may be mounted in a monitoring camera mounted on a car, truck, fire truck, forklift, or the like, or a camera for automatic driving. However, the use range and use examples of the imaging lens system described in the present specification are not limited to the above-described apparatus. For example, the imaging lens system may be mounted on a camera provided in a reconnaissance drone, a transportation drone, or the like.

The imaging lens system according to the first aspect of the present disclosure 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, a seventh lens, and an eighth lens, which are disposed in order from the object side. The imaging lens system according to the first aspect may be configured such that the entrance pupil is formed on the object side of the third lens. For example, an entrance pupil may be formed between the first lens and the second lens. As another example, the entrance pupil may be formed at a point within 3.0mm from the object side of the first lens. As another example, an entrance pupil may be formed on the object side of the aperture.

The imaging lens system according to the first aspect may further include other optical elements as needed. For example, the imaging lens system according to the first aspect may further comprise a diaphragm. A diaphragm may be arranged between the lenses. For example, a diaphragm may be provided between the second lens and the third lens. As another example, a diaphragm may be disposed between lenses having the same sign of refractive power.

The imaging lens system according to the second aspect of the present disclosure 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, a seventh lens, and an eighth lens, which are disposed in order from the object side. The imaging lens system according to the second aspect of the present disclosure may include one or more glass lenses and plastic lenses. For example, the imaging lens system according to the second aspect may include two glass lenses and six plastic lenses. However, the number of glass lenses and plastic lenses constituting the imaging lens system is not limited to the above-described form. For example, the imaging lens system according to the second aspect may include one glass lens and seven plastic lenses.

In the imaging lens system according to the second aspect, the lens formed of the glass material can reduce or suppress degradation of the plastic material. For example, in the imaging lens system according to the second aspect, the first lens disposed at the forefront may be formed of a glass material. As another example, in the imaging lens system according to the second aspect, one of lenses disposed behind the stop (image side) may be formed of a glass material. As a specific example, the fourth lens may be formed of a glass material.

The imaging lens system according to the third aspect of the present disclosure 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, a seventh lens, and an eighth lens, which are disposed in order from the object side. The imaging lens system according to the third aspect of the present disclosure may include a lens configured to block ultraviolet rays. For example, in the imaging lens system according to the third aspect, the first lens disposed at the forefront may be configured to block ultraviolet rays. The imaging lens system according to the third aspect may include a plastic lens. For example, the lens disposed behind the first lens may be a lens formed of a plastic material.

The imaging lens system according to the fourth aspect of the present disclosure 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, a seventh lens, and an eighth lens, which are disposed in order from the object side. The imaging lens system according to the fourth aspect of the present disclosure may include a lens having positive refractive power and a lens having negative refractive power. For example, in the imaging lens system according to the fourth aspect, the first lens may have a negative refractive power, but the fourth lens may have a positive refractive power. The imaging lens system according to the fourth aspect may include a lens having a concave object side surface. For example, in the imaging lens system according to the fourth aspect, the fifth lens may have a concave object side surface. The imaging lens system according to the fourth aspect may include a lens having a convex object side. For example, in the imaging lens system according to the fourth aspect, the sixth lens may have a convex object side. The imaging lens system according to the fourth aspect may satisfy a specific conditional expression. For example, the imaging lens system according to the fourth aspect may satisfy the conditional expression 0.170< imgct/TTL <0.182 with respect to imgct (height of imaging plane) and TTL (distance from the object side surface of the first lens to the imaging plane).

The imaging lens system according to the fifth aspect of the present disclosure 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, a seventh lens, and an eighth lens, which are disposed in order from the object side. The imaging lens system according to the fifth aspect of the present disclosure may include a lens having a negative refractive power. For example, in the imaging lens system according to the fifth aspect, each of the first lens and the fifth lens may have a negative refractive power. The imaging lens system according to the fifth aspect may include a lens having a convex object side. For example, in the imaging lens system according to the fifth aspect, the sixth lens may have a convex object side. The imaging lens system according to the fifth aspect may satisfy a unique conditional expression. For example, the imaging lens system according to the fifth aspect may satisfy the conditional expression 15.0< V3/(nd1+nd4) < 17.0) with respect to the abbe number (V3) of the third lens, the refractive index (Nd 1) of the first lens, and the refractive index (Nd 4) of the fourth lens.

The imaging lens system according to the sixth aspect of the present disclosure 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, a seventh lens, and an eighth lens, which are disposed in order from the object side. The imaging lens system according to the sixth aspect may be configured to satisfy at least one of the following conditional expressions.

0.70<f/f4<0.90

L1D1/TTL<0.350

0.170<ImgHT/TTL<0.182

f1/f2<0

f5/f6<0

4.50<TTL/f<4.90

L1D1/ImgHT<2.0

In the above conditional expression, f is the focal length of the imaging lens system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, L1D1 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 surface, and imgct is the height of the imaging surface.

The imaging lens system according to the sixth aspect of the present disclosure may satisfy a more limited numerical range with respect to some conditional expressions as follows.

0.25<L1D1/TTL<0.35

-0.40<f1/f2<-0.20

-1.0<f5/f6<-0.40

1.60<L1D1/ImgHT<2.0

The imaging lens system according to the seventh aspect of the present disclosure 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, a seventh lens, and an eighth lens, which are disposed in order from the object side. The imaging lens system according to the seventh aspect may be configured to satisfy at least one of the following conditional expressions.

f-number <1.7

-1.20<f1/f<-0.90

-0.40<f1/f3<-0.020

-1.0<f1/f4<-0.60

-10<V1-V3<-5

0.009<|f/R1|<0.090

0.002<|R2/R1|<0.080

0.80<|R5/R6|<1.40

12<V4/(Nd1+Nd4)<15

15<V3/(Nd1+Nd4)<17

2.30<(Nd1+Nd4)/Ndmin<2.40

59<V1/Nd2+V4/Nd5<62

In the above conditional expression, f3 is the focal length of the third lens, R1 is the radius of curvature of the object side surface of the first lens, R2 is the radius of curvature of the image side surface of the first 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, V1 is the abbe number of the first lens, V3 is the abbe number of the third lens, V4 is the abbe number of the fourth lens, nd1 is the refractive index of the first lens, nd2 is the refractive index of the second lens, nd4 is the refractive index of the fourth lens, nd5 is the refractive index of the fifth lens, and Ndmin is the minimum value of the refractive indices of the first to eighth lenses.

An imaging lens system according to the present specification may include one or more lenses having the following characteristics as needed. For example, the imaging lens system according to the first aspect may include one of the first to eighth lenses having the following characteristics. As another example, one of the imaging lens systems according to the second to seventh aspects may include one or more of the first to eighth lenses having the following characteristics. However, the imaging lens system according to the above aspect does not necessarily include a lens having the following characteristics. Hereinafter, characteristics of the first to eighth lenses will be described.

The first lens has a refractive power. For example, the first lens may have a negative refractive power. One surface of the first lens may be concave. For example, the image side of the first lens may be concave. The first lens includes 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 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 1.74 and less than 1.90. 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 45 and less than 60. The first lens may be configured to block light of a specific wavelength. For example, the first lens may be configured to block ultraviolet light.

The second lens has a refractive power. For example, the second lens may have positive refractive power. One surface of the second lens may be convex. For example, the image side of the second lens may be convex. The second lens includes an aspherical surface. For example, both surfaces of the second lens may be aspherical. 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. 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 1.6. As a specific example, the refractive index of the second lens may be greater than 1.60 and less than 1.64. The second lens may have a predetermined abbe number. For example, the abbe number of the second lens may be less than 30. As a specific example, the abbe number of the second lens may be greater than 20 and less than 30.

The third lens has refractive power. For example, the third lens may have positive refractive power. One surface of the third lens may be concave. For example, the object-side surface of the third lens may be concave. The third lens includes an aspherical 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. 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 1.5 and less than 1.6. The third lens may have a predetermined abbe number. For example, the abbe number of the third lens may be greater than 50 and less than 60.

The fourth lens has refractive power. For example, the fourth lens may have positive refractive power. One surface of the fourth lens may be convex. For example, the object side surface of the fourth lens may be convex. The fourth lens includes an aspherical surface. For example, both surfaces of the fourth lens may be aspherical. 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 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 1.70 and less than 1.84. 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 70.

The fifth lens has refractive power. For example, the fifth lens may have a negative refractive power. One surface of the fifth lens may be concave. For example, the object side of the fifth lens may be concave. The fifth lens includes an aspherical 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. 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 1.6. As a specific example, the refractive index of the fifth lens may be greater than 1.60 and less than 1.74. The fifth lens may have a predetermined abbe number. For example, the abbe number of the fifth lens may be 20 or more. As a specific example, the abbe number of the fifth lens may be greater than 20 and less than 30.

The sixth lens has refractive power. For example, the sixth lens may have positive refractive power. One surface of the sixth lens may be convex. For example, the object side surface of the sixth lens may be convex. The sixth lens includes an aspherical 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. 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 1.50 and less than 1.60. The sixth lens may have a predetermined abbe number. For example, the abbe number of the sixth lens may be greater than 50 and less than 60.

The seventh lens has refractive power. For example, the seventh lens may have a negative refractive power. One surface of the seventh lens may be concave. For example, the image side of the seventh lens may be concave. The seventh lens includes an aspherical surface. For example, both surfaces of the seventh lens may be aspherical. The seventh lens may have a inflection point. For example, at least one of the object side surface and the image side surface of the seventh lens may have a inflection point. 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 1.60 and less than 1.70. The seventh lens may have a predetermined abbe number. For example, the abbe number of the seventh lens may be greater than 20 and less than 30.

The eighth lens has refractive power. For example, the eighth lens may have positive refractive power. One surface of the eighth lens may be convex. For example, the object side surface of the eighth lens may be convex. The eighth lens includes an aspherical surface. For example, both surfaces of the eighth lens may be aspherical. The eighth lens may be formed of a material having high light transmittance and excellent workability. For example, the eighth lens may be formed of a plastic material. The eighth lens may be configured to have a predetermined refractive index. For example, the refractive index of the eighth lens may be greater than 1.50 and less than 1.60. The eighth lens may have a predetermined abbe number. For example, the abbe number of the eighth lens may be greater than 50 and less than 60.

The aspherical surface of the above lens can be expressed by equation 1.

Equation 1:

in equation 1, c is the inverse of the radius of curvature of the corresponding lens, k is a conic constant, r is the distance from a specific point on the aspherical surface to the optical axis, a to H and J are aspherical constants, and Z (or SAG) is the height in the optical axis direction from the specific point on the aspherical surface to the vertex of the corresponding aspherical surface.

The imaging lens system according to the above aspect may further include a diaphragm, an optical filter, and a cover glass. For example, the imaging lens system may further include a stop disposed between the second lens and the third 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 filter and a cover glass disposed between the eighth lens and the imaging surface. The filter may be configured to block light of a specific wavelength, and the cover glass may be configured to block foreign substances or the like introduced in the direction of the imaging surface. For reference, one or more of the filter, cover glass, or cover glass may be omitted, if desired.

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

First, an imaging lens system according to a first exemplary embodiment will be described with reference to fig. 1.

The imaging lens system 100 includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170, and an eighth lens 180.

The first lens 110 has a negative refractive power and has a convex object side and a concave image side. The second lens 120 has positive refractive power and has a concave object side and a convex image side. The third lens 130 has positive refractive power and has a concave object side surface and a convex image side surface. The fourth lens 140 has positive refractive power and has a convex object side and a convex image side. The fifth lens 150 has a negative refractive power and has a concave object side surface and a concave image side surface. The sixth lens 160 has positive refractive power and has a convex object side and a convex image side. The seventh lens 170 has a negative refractive power and has a convex object side and a concave image side. In addition, the object side surface of the seventh lens 170 has a inflection point. The eighth lens 180 has positive refractive power and has a convex object side and a concave image side. The diaphragm ST is disposed between the second lens 120 and the third lens 130.

The imaging lens system 100 may further include a filter IF and an imaging plane IP. The filter IF may be disposed between the eighth lens 180 and the imaging plane IP. The filter IF may be omitted IF desired. The imaging plane IP may be formed on one surface of the image sensor IS of the camera module or formed inside the image sensor IS. However, the position of the imaging plane IP IS not limited to one surface or inside of the image sensor IS.

Tables 1 and 2 show lens characteristics and aspherical surface values of the imaging lens system according to the present exemplary embodiment, and fig. 2 shows aberration curves of the imaging lens system according to the present exemplary embodiment.

TABLE 1

TABLE 2

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

The imaging lens system 200 includes a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, a sixth lens 260, a seventh lens 270, and an eighth lens 280.

The first lens 210 has a negative refractive power and has a concave object side surface and a concave image side surface. The second lens 220 has positive refractive power and has a concave object side and a convex image side. The third lens 230 has positive refractive power and has a concave object side surface and a convex image side surface. The fourth lens 240 has positive refractive power and has a convex object side and a convex image side. The fifth lens 250 has a negative refractive power and has a concave object side surface and a concave image side surface. The sixth lens 260 has positive refractive power and has a convex object side and a convex image side. The seventh lens 270 has a negative refractive power and has a convex object side and a concave image side. In addition, the object-side surface of the seventh lens 270 has an inflection point. The eighth lens 280 has positive refractive power and has a convex object side and a convex image side. The diaphragm ST is disposed between the second lens 220 and the third lens 230.

Imaging lens system 200 may also include a filter IF and an imaging plane IP. The filter IF may be disposed between the eighth lens 280 and the imaging plane IP. The filter IF may be omitted IF desired. The imaging plane IP may be formed on one surface of the image sensor IS of the camera module or formed inside the image sensor IS. However, the position of the imaging plane IP IS not limited to one surface or inside of the image sensor IS.

Tables 3 and 4 show lens characteristics and aspherical surface values of the imaging lens system according to the present exemplary embodiment, and fig. 4 shows aberration curves of the imaging lens system according to the present exemplary embodiment.

TABLE 3 Table 3

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TABLE 4 Table 4

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

The imaging lens system 300 includes a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, a sixth lens 360, a seventh lens 370, and an eighth lens 380.

The first lens 310 has a negative refractive power and has a concave object side surface and a concave image side surface. The second lens 320 has positive refractive power and has a concave object side and a convex image side. The third lens 330 has positive refractive power and has a concave object side surface and a convex image side surface. The fourth lens 340 has positive refractive power and has a convex object side and a convex image side. The fifth lens 350 has a negative refractive power and has a concave object side surface and a concave image side surface. The sixth lens 360 has positive refractive power and has a convex object side and a convex image side. The seventh lens 370 has a negative refractive power and has a convex object side and a concave image side. The eighth lens 380 has positive refractive power and has a convex object side and a concave image side. The diaphragm ST is disposed between the second lens 320 and the third lens 330.

Imaging lens system 300 may also include a filter IF and an imaging plane IP. The filter IF may be disposed between the eighth lens 380 and the imaging plane IP. The filter IF may be omitted IF desired. The imaging plane IP may be formed on one surface of the image sensor IS of the camera module or formed inside the image sensor IS. However, the position of the imaging plane IP IS not limited to one surface or inside of the image sensor IS.

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

TABLE 5

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TABLE 6

Face numbering	S3	S4	S6	S7	S8	S9	S10
								k	0.00000	0.72825	0.00000	-1.54307	-8.38726	0.00000	-7.38961
A	-0.56941	-0.39243	0.67628	0.40105	0.05797	0.18876	-0.25385
								B	-0.04355	-0.01439	0.01230	0.02056	0.02515	0.01343	0.02280
C	-0.00389	-0.00246	0.00060	0.00085	-0.00177	-0.00042	0.00005
								D	-0.00019	0	0	0.00045	0	0	0
E	0	0	0	0	0	0	0
								F	0	0	0	0	0	0	0
G	0	0	0	0	0	0	0
								H	0	0	0	0	0	0	0
J	0	0	0	0	0	0	0
								Face numbering	S11	S12	S13	S14	S15	S16	S17
k	0.00000	0.00000	0.00000	0.00000	-5.45348	0.00000	0.00000
								A	0.01776	0.55200	0.56922	-0.97579	0.00583	0.13020	0.05130
B	0.04605	-0.00180	0.02455	0.16717	0.09673	0.04066	0.02007
								C	-0.00216	0.00421	0.01073	-0.02092	-0.01784	-0.00972	-0.00400
D	0	0	0	0.00007	0	0	-0.00104
								E	0	0	0	0	0	0	0
F	0	0	0	0	0	0	0
								G	0	0	0	0	0	0	0
H	0	0	0	0	0	0	0
								J	0	0	0	0	0	0	0

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

The imaging lens system 400 includes a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, a sixth lens 460, a seventh lens 470, and an eighth lens 480.

The first lens 410 has a negative refractive power and has a convex object side and a concave image side. The second lens 420 has positive refractive power and has a concave object side and a convex image side. The third lens 430 has positive refractive power and has a concave object side and a convex image side. The fourth lens 440 has positive refractive power and has a convex object side and a convex image side. The fifth lens 450 has a negative refractive power and has a concave object side surface and a concave image side surface. The sixth lens 460 has positive refractive power and has a convex object side and a convex image side. The seventh lens 470 has a negative refractive power and has a convex object side and a concave image side. In addition, the object side surface of the seventh lens 470 has a inflection point. The eighth lens 480 has positive refractive power and has a convex object side and a concave image side. The diaphragm ST is disposed between the second lens 420 and the third lens 430.

Imaging lens system 400 may also include a filter IF and an imaging plane IP. The filter IF may be disposed between the eighth lens 480 and the imaging plane IP. The filter IF may be omitted IF desired. The imaging plane IP may be formed on one surface of the image sensor IS of the camera module or formed inside the image sensor IS. However, the position of the imaging plane IP IS not limited to one surface or inside of the image sensor IS.

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

TABLE 7

TABLE 8

Face numbering	S3	S4	S6	S7	S8	S9	S10
								k	0.00000	-0.48236	0.00000	-0.59796	-4.04617	0.00000	-30.40330
A	-0.29472	-0.17735	0.08048	-0.00515	-0.20678	-0.04461	-0.33474
								B	-0.01143	-0.00655	-0.01362	-0.02574	0.00523	-0.00142	0.00590
C	-0.00073	-0.00019	-0.00021	0.00020	-0.00002	0.00085	0.00574
								D	0	0	0	0	0	0	0
E	0	0	0	0	0	0	0
								F	0	0	0	0	0	0	0
G	0	0	0	0	0	0	0
								H	0	0	0	0	0	0	0
J	0	0	0	0	0	0	0
								Face numbering	S11	S12	S13	S14	S15	S16	S17
k	0.00000	0.00000	0.00000	0.00000	-3.90986	0.00000	0.00000
								A	-0.42278	-0.09266	0.27991	-2.13626	-0.30731	-0.95139	-0.59083
B	0.01545	0.06324	0.09288	0.29682	0.25039	0.11858	-0.00959
								C	0.00046	-0.00004	0.00782	-0.05863	-0.02534	-0.03923	-0.03595
D	0	0.00049	0	0	0	0	-0.00003
								E	0	0	0	0	0	0	0
F	0	0	0	0	0	0	0
								G	0	0	0	0	0	0	0
H	0	0	0	0	0	0	0
								J	0	0	0	0	0	0	0

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

The imaging lens system 500 includes a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, a sixth lens 560, a seventh lens 570, and an eighth lens 580.

The first lens 510 has a negative refractive power and has a concave object side surface and a concave image side surface. The second lens 520 has positive refractive power and has a convex object side and a convex image side. The third lens 530 has positive refractive power and has a concave object side surface and a convex image side surface. The fourth lens 540 has positive refractive power and has a convex object side and a convex image side. The fifth lens 550 has a negative refractive power and has a concave object side surface and a concave image side surface. The sixth lens 560 has positive refractive power and has a convex object side and a convex image side. The seventh lens 570 has a negative refractive power and has a convex object side and a concave image side. In addition, the object side surface of the seventh lens 570 has an inflection point. The eighth lens 580 has positive refractive power and has a convex object side and a concave image side. The diaphragm ST is disposed between the second lens 520 and the third lens 530.

Imaging lens system 500 may also include a filter IF and an imaging plane IP. The filter IF may be disposed between the eighth lens 580 and the imaging plane IP. The filter IF may be omitted IF desired. The imaging plane IP may be formed on one surface of the image sensor IS of the camera module or formed inside the image sensor IS. However, the position of the imaging plane IP IS not limited to one surface or inside of the image sensor IS.

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

TABLE 9

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Table 10

Face numbering	S3	S4	S6	S7	S8	S9	S10
								k	0.00000	-8.98358	0.00000	-1.03883	-2.85853	0.00000	-35.9411
A	0.00176	0.05084	0.28557	0.09549	-0.10866	0.06213	-0.23178
								B	0.00267	-0.00404	-0.02578	-0.03124	0.00665	0.00164	-0.00776
C	-0.00079	-0.00221	-0.00201	-0.00182	-0.00069	0.00019	0.00472
								D	0	0	0	0	0	0	0
E	0	0	0	0	0	0	0
								F	0	0	0	0	0	0	0
G	0	0	0	0	0	0	0
								H	0	0	0	0	0	0	0
J	0	0	0	0	0	0	0
								Face numbering	S11	S12	S13	S14	S15	S16	S17
k	0.00000	0.00000	0.00000	0.00000	-4.35358	0.00000	0.00000
								A	-0.16856	0.38283	-0.24937	-2.03716	-0.65158	-1.03720	-0.38337
B	-0.00687	0.01402	0.07654	0.21786	0.22282	0.10875	-0.00801
								C	-0.00103	-0.00745	-0.00253	-0.01574	-0.01970	-0.03943	-0.01291
D	0	0.00177	0	0	0	0	-0.00235
								E	0	0	0	0	0	0	0
F	0	0	0	0	0	0	0
								G	0	0	0	0	0	0	0
H	0	0	0	0	0	0	0
								J	0	0	0	0	0	0	0

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

The imaging lens system 600 includes a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, a fifth lens 650, a sixth lens 660, a seventh lens 670, and an eighth lens 680.

The first lens 610 has a negative refractive power and has a concave object side surface and a concave image side surface. The second lens 620 has positive refractive power and has a convex object side and a convex image side. The third lens 630 has positive refractive power and has a concave object side surface and a convex image side surface. The fourth lens 640 has positive refractive power and has a convex object side and a convex image side. The fifth lens 650 has a negative refractive power and has a concave object side surface and a concave image side surface. The sixth lens 660 has positive refractive power and has a convex object side surface and a convex image side surface. The seventh lens 670 has a negative refractive power and has a convex object side and a concave image side. In addition, the object side surface of the seventh lens 670 has an inflection point. The eighth lens 680 has positive refractive power and has a convex object side and a concave image side. The diaphragm ST is disposed between the second lens 620 and the third lens 630.

Imaging lens system 600 may also include a filter IF and an imaging plane IP. The filter IF may be disposed between the eighth lens 680 and the imaging plane IP. The filter IF may be omitted IF desired. The imaging plane IP may be formed on one surface of the image sensor IS of the camera module or formed inside the image sensor IS. However, the position of the imaging plane IP IS not limited to one surface or inside of the image sensor IS.

Tables 11 and 12 show lens characteristics and aspherical surface values of the imaging lens system according to the present exemplary embodiment, and fig. 12 shows aberration curves of the imaging lens system according to the present exemplary embodiment.

TABLE 11

Table 12

Face numbering	S3	S4	S6	S7	S8	S9	S10
								k	0.00000	-11.49660	0.00000	-0.99671	-2.86450	0.00000	-36.63820
A	-0.01279	0.10544	0.38286	0.09579	-0.12934	0.02519	-0.26224
								B	0.00251	0.00482	-0.01619	-0.01965	0.00462	-0.00030	-0.00715
C	-0.00064	-0.00120	0.00033	0.00042	-0.00148	-0.00090	0.00108
								D	0	0	0	0	0	0	0
E	0	0	0	0	0	0	0
								F	0	0	0	0	0	0	0
G	0	0	0	0	0	0	0
								H	0	0	0	0	0	0	0
J	0	0	0	0	0	0	0
								Face numbering	S11	S12	S13	S14	S15	S16	S17
k	0.00000	0.00000	0.00000	0.00000	-4.32642	-0.02804	2.01537
								A	-0.09851	0.37017	-0.22460	-1.87037	-0.62107	-1.02695	-0.34726
B	-0.01015	-0.00039	0.06538	0.20578	0.21278	0.10462	-0.00228
								C	-0.00438	-0.00609	-0.00314	-0.02402	-0.03105	-0.04152	-0.01443
D	0	0.00111	0	0	0	0.00122	-0.00127
								E	0	0	0	0	0	0	0
F	0	0	0	0	0	0	0
								G	0	0	0	0	0	0	0
H	0	0	0	0	0	0	0
								J	0	0	0	0	0	0	0

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

The imaging lens system 700 includes a first lens 710, a second lens 720, a third lens 730, a fourth lens 740, a fifth lens 750, a sixth lens 760, a seventh lens 770, and an eighth lens 780.

The first lens 710 has a negative refractive power and has a concave object side surface and a concave image side surface. The second lens 720 has positive refractive power and has a convex object side and a convex image side. The third lens 730 has positive refractive power and has a concave object side and a convex image side. The fourth lens 740 has positive refractive power and has a convex object side and a convex image side. The fifth lens 750 has a negative refractive power and has a concave object side surface and a concave image side surface. The sixth lens 760 has positive refractive power and has a convex object side and a convex image side. The seventh lens 770 has negative refractive power and has a convex object side and a concave image side. In addition, the object side surface of the seventh lens 770 has a inflection point. The eighth lens 780 has positive refractive power and has a convex object side and a concave image side. The diaphragm ST is disposed between the second lens 720 and the third lens 730.

Imaging lens system 700 may also include a filter IF and an imaging plane IP. The filter IF may be disposed between the eighth lens 780 and the imaging plane IP. The filter IF may be omitted IF desired. The imaging plane IP may be formed on one surface of the image sensor IS of the camera module or formed inside the image sensor IS. However, the position of the imaging plane IP IS not limited to one surface or inside of the image sensor IS.

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

TABLE 13

TABLE 14

Face numbering	S3	S4	S6	S7	S8	S9	S10
								k	0.00000	-9.54856	0.00000	-1.02709	-3.00541	0.00000	-37.76290
A	0.00606	0.07364	0.31069	0.09492	-0.11605	0.05553	-0.23670
								B	0.00348	-0.00088	-0.02222	-0.02639	0.00564	-0.00263	-0.01019
C	-0.00039	-0.00105	0.00032	0.00084	-0.00012	0.00206	0.00573
								D	0	0	0	0	0	0	0
E	0	0	0	0	0	0	0
								F	0	0	0	0	0	0	0
G	0	0	0	0	0	0	0
								H	0	0	0	0	0	0	0
J	0	0	0	0	0	0	0
								Face numbering	S11	S12	S13	S14	S15	S16	S17
k	0.00000	0.00000	0.00000	0.00000	-4.43281	0.00000	0.00000
								A	-0.15669	0.40469	-0.27029	-2.01561	-0.66858	-0.94657	-0.38137
B	-0.00830	0.01526	0.07900	0.19759	0.21473	0.11668	-0.01198
								C	-0.00368	-0.00879	-0.00158	-0.01031	-0.01857	-0.04097	-0.01837
D	0	0.00149	0	0	0	0	-0.00251
								E	0	0	0	0	0	0	0
F	0	0	0	0	0	0	0
								G	0	0	0	0	0	0	0
H	0	0	0	0	0	0	0
								J	0	0	0	0	0	0	0

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

The imaging lens system 800 includes a first lens 810, a second lens 820, a third lens 830, a fourth lens 840, a fifth lens 850, a sixth lens 860, a seventh lens 870, and an eighth lens 880.

The first lens 810 has negative refractive power and has a concave object side surface and a concave image side surface. The second lens 820 has positive refractive power and has a concave object side and a convex image side. The third lens 830 has positive refractive power and has a concave object side surface and a convex image side surface. The fourth lens 840 has positive refractive power and has a convex object side and a convex image side. The fifth lens 850 has negative refractive power and has a concave object side surface and a concave image side surface. The sixth lens 860 has positive refractive power and has a convex object side and a convex image side. The seventh lens 870 has negative refractive power and has a concave object side surface and a concave image side surface. The eighth lens 880 has positive refractive power and has a convex object side and a concave image side. The diaphragm ST is disposed between the second lens 820 and the third lens 830.

Imaging lens system 800 may also include a filter IF and an imaging plane IP. The filter IF may be disposed between the eighth lens 880 and the imaging plane IP. The filter IF may be omitted IF desired. The imaging plane IP may be formed on one surface of the image sensor IS of the camera module or formed inside the image sensor IS. However, the position of the imaging plane IP IS not limited to one surface or inside of the image sensor IS.

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

TABLE 15

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Table 16

Face numbering	S3	S4	S6	S7	S8	S9	S10
								k	0.00000	-7.16050	0.00000	-0.78280	-1.61312	0.00000	-62.7115
A	-0.05249	0.13560	0.41265	0.13107	-0.11399	0.09732	-0.18955
								B	0.00143	0.00635	-0.00866	-0.01176	0.01129	0.00947	0.02987
C	-0.00094	-0.00159	-0.00033	-0.00040	-0.00457	-0.00488	-0.00737
								D	0	0	0	0	0	0	0
E	0	0	0	0	0	0	0
								F	0	0	0	0	0	0	0
G	0	0	0	0	0	0	0
								H	0	0	0	0	0	0	0
J	0	0	0	0	0	0	0
								Face numbering	S11	S12	S13	S14	S15	S16	S17
k	0.00000	0.00000	0.00000	0	-3.22191	0.00000	0.00000
								A	-0.02428	0.50574	0.38086	0	0.22871	-0.33561	-0.27734
B	0.05138	-0.00400	-0.08116	0	0.10687	0.06252	-0.00830
								C	-0.01234	-0.01918	0.01159	0	-0.01815	-0.02992	-0.01467
D	0	0.00320	0	0	0	0	-0.00506
								E	0	0	0	0	0	0	0
F	0	0	0	0	0	0	0
								G	0	0	0	0	0	0	0
H	0	0	0	0	0	0	0
								J	0	0	0	0	0	0	0

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

The imaging lens system 900 includes a first lens 910, a second lens 920, a third lens 930, a fourth lens 940, a fifth lens 950, a sixth lens 960, a seventh lens 970, and an eighth lens 980.

The first lens 910 has a negative refractive power and has a concave object side surface and a concave image side surface. The second lens 920 has positive refractive power and has a concave object side and a convex image side. The third lens 930 has positive refractive power and has a concave object side surface and a convex image side surface. The fourth lens 940 has positive refractive power and has a convex object side and a convex image side. The fifth lens 950 has negative refractive power and has a concave object side surface and a concave image side surface. The sixth lens 960 has positive refractive power and has a convex object side and a convex image side. The seventh lens 970 has negative refractive power and has a concave object side surface and a concave image side surface. The eighth lens 980 has positive refractive power and has a convex object side and a concave image side. The diaphragm ST is disposed between the second lens 920 and the third lens 930.

Imaging lens system 900 may also include a filter IF and an imaging plane IP. The filter IF may be disposed between the eighth lens 980 and the imaging plane IP. The filter IF may be omitted IF desired. The imaging plane IP may be formed on one surface of the image sensor IS of the camera module or formed inside the image sensor IS. However, the position of the imaging plane IP IS not limited to one surface or inside of the image sensor IS.

Tables 17 and 18 show lens characteristics and aspherical surface values of the imaging lens system according to the present exemplary embodiment, and fig. 18 shows aberration curves of the imaging lens system according to the present exemplary embodiment.

TABLE 17

TABLE 18

Face numbering	S3	S4	S6	S7	S8	S9	S10
								k	0.00000	-6.77282	0.00000	-0.79114	-1.93566	0.00000	-62.70650
A	-0.06213	0.12999	0.43025	0.13495	-0.12391	0.07774	-0.20583
								B	0.00178	0.00724	-0.00823	-0.01116	0.01481	0.01318	0.02820
C	-0.00087	-0.00165	-0.00043	-0.00049	-0.00476	-0.00518	-0.00795
								D	0	0	0	0	0	0	0
E	0	0	0	0	0	0	0
								F	0	0	0	0	0	0	0
G	0	0	0	0	0	0	0
								H	0	0	0	0	0	0	0
J	0	0	0	0	0	0	0
								Face numbering	S11	S12	S13	S14	S15	S16	S17
k	0.00000	0.00000	0.00000	0.00000	-4.44831	0.00000	0.00000
								A	-0.03854	0.47780	0.36879	0.00000	0.23374	-0.33171	-0.24535
B	0.05578	0.01037	-0.07474	0.00000	0.10514	0.05824	-0.01286
								C	-0.01523	-0.02301	0.01244	0.00000	-0.01891	-0.02958	-0.01393
D	0	0.00386	0	0	0	0	-0.00489
								E	0	0	0	0	0	0	0
F	0	0	0	0	0	0	0
								G	0	0	0	0	0	0	0
H	0	0	0	0	0	0	0
								J	0	0	0	0	0	0	0

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

Imaging lens system 1000 includes a first lens 1010, a second lens 1020, a third lens 1030, a fourth lens 1040, a fifth lens 1050, a sixth lens 1060, a seventh lens 1070, and an eighth lens 1080.

The first lens 1010 has a negative refractive power and has a concave object side surface and a concave image side surface. The second lens 1020 has a positive refractive power and has a concave object side surface and a convex image side surface. The third lens 1030 has positive refractive power and has a concave object side surface and a convex image side surface. The fourth lens 1040 has positive refractive power and has a convex object side and a convex image side. The fifth lens 1050 has negative refractive power and has a concave object side surface and a concave image side surface. The sixth lens 1060 has positive refractive power and has a convex object side and a convex image side. The seventh lens 1070 has a negative refractive power and has a concave object side surface and a concave image side surface. The eighth lens 1080 has positive refractive power and has a convex object side and a concave image side. A stop ST is disposed between the second lens 1020 and the third lens 1030.

Imaging lens system 1000 may also include a filter IF and an imaging plane IP. The filter IF may be disposed between the eighth lens 1080 and the imaging plane IP. The filter IF may be omitted IF desired. The imaging plane IP may be formed on one surface of the image sensor IS of the camera module or formed inside the image sensor IS. However, the position of the imaging plane IP IS not limited to one surface or inside of the image sensor IS.

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

TABLE 19

Table 20

Face numbering	S3	S4	S6	S7	S8	S9	S10
								k	0.00000	-5.48857	0.00000	-0.81443	-1.91589	0.00000	-46.39350
A	-0.10166	0.12055	0.48244	0.14552	-0.11810	0.06840	-0.28617
								B	-0.00011	0.01004	-0.00536	-0.00901	0.01795	0.01695	0.03593
C	-0.00108	-0.00183	-0.00075	-0.00016	-0.00485	-0.00504	-0.00984
								D	0	0	0	0	0	0	0
E	0	0	0	0	0	0	0
								F	0	0	0	0	0	0	0
G	0	0	0	0	0	0	0
								H	0	0	0	0	0	0	0
J	0	0	0	0	0	0	0
								Face numbering	S11	S12	S13	S14	S15	S16	S17
k	0.00000	0.00000	0.00000	0.00000	-6.16861	0.00000	0.00000
								A	-0.09694	0.47855	0.39138	0.00000	0.24485	-0.41985	-0.20599
B	0.06397	0.01311	-0.07935	0.00000	0.11956	0.06729	-0.01634
								C	-0.01835	-0.02347	0.01667	0.00000	-0.02443	-0.03516	-0.01624
D	0	0.00458	0	0	0	0	-0.00655
								E	0	0	0	0	0	0	0
F	0	0	0	0	0	0	0
								G	0	0	0	0	0	0	0
H	0	0	0	0	0	0	0
								J	0	0	0	0	0	0	0

Table 21, table 22, table 23, and table 24 are optical characteristic values and conditional expression values of the imaging lens systems according to the first to tenth exemplary embodiments. For reference, in tables 21 and 22, VFOV is vertical field of view, HFOV is horizontal field of view, and DFOV is diagonal field of view.

Table 21

Table 22

Table 23

/>

Table 24

According to one or more exemplary embodiments disclosed herein, the imaging lens system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens disposed in order from the object side. Imaging lens systems according to one or more exemplary embodiments disclosed herein may include lenses formed from glass that are capable of exhibiting constant performance even over a wide range of temperature conditions.

The present disclosure can realize an imaging lens system capable of minimizing degradation caused by ultraviolet rays while having a wide operating temperature range.

While specific examples have been shown and described above, it will be apparent, after an understanding of the present disclosure, that various changes in form and details may be made therein without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be construed in an illustrative, and not a restrictive sense. The description of features or aspects in each example should be considered as 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. Thus, the scope of the disclosure is not to be limited by the specific embodiments, but by the claims and their equivalents, and all modifications within the scope of the claims and their equivalents are to be construed as being included in the disclosure.

Claims (20)

1. An imaging lens system comprising:

a first lens having a negative refractive power;

a second lens having a refractive power;

a third lens having a refractive power;

a fourth lens having a positive refractive power;

a fifth lens having a concave object side surface;

a sixth lens having a convex object side;

a seventh lens having a refractive power; and

an eighth lens having a refractive power,

wherein the first lens to the eighth lens are disposed in order from the object side with an interval,

wherein the imaging lens system satisfies the following conditional expression:

0.170<ImgHT/TTL<0.182

wherein ImgHT is the height of the imaging plane, and TTL is the distance from the object side of the first lens to the imaging plane, and

wherein the imaging lens system has a total of eight lenses.

2. The imaging lens system as claimed in claim 1, wherein,

the imaging lens system satisfies the following conditional expression:

0.70<f/f4<0.90

where f is the focal length of the imaging lens system, and f4 is the focal length of the fourth lens.

3. The imaging lens system as claimed in claim 1, wherein,

the imaging lens system satisfies the following conditional expression:

L1D1/TTL<0.350

wherein L1D1 is an effective diameter of the object side surface of the first lens.

4. The imaging lens system as claimed in claim 1, wherein,

the imaging lens system satisfies the following conditional expression:

f1/f2<0

where f1 is the focal length of the first lens and f2 is the focal length of the second lens.

5. The imaging lens system as claimed in claim 1, wherein,

the imaging lens system satisfies the following conditional expression:

f5/f6<0

where f5 is the focal length of the fifth lens and f6 is the focal length of the sixth lens.

6. The imaging lens system as claimed in claim 1, wherein,

the imaging lens system satisfies the following conditional expression:

4.50<TTL/f<4.90

where f is the focal length of the imaging lens system.

7. The imaging lens system as claimed in claim 1, wherein,

the imaging lens system satisfies the following conditional expression:

L1D1/ImgHT<2.0

wherein L1D1 is an effective diameter of the object side surface of the first lens.

8. The imaging lens system of claim 1 wherein the f-number is less than 1.7.

9. An imaging lens system comprising:

a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens disposed in order from the object side at intervals,

wherein the first lens and the fifth lens each have a negative refractive power,

The sixth lens has a convex object side,

wherein the imaging lens system satisfies the following conditional expression:

15.0<V3/(Nd1+Nd4)<17.0

wherein Nd1 is the refractive index of the first lens, nd4 is the refractive index of the fourth lens, and V3 is the Abbe number of the third lens, and

wherein the imaging lens system has a total of eight lenses.

10. The imaging lens system as claimed in claim 9, wherein,

the imaging lens system satisfies the following conditional expression:

1.60<L1D1/ImgHT<2.0

wherein L1D1 is an effective diameter of an object side surface of the first lens, and imgsht is a height of an imaging surface.

11. The imaging lens system as claimed in claim 9, wherein,

the imaging lens system satisfies the following conditional expression:

0.009<|f/R1|<0.090

where f is the focal length of the imaging lens system and R1 is the radius of curvature of the object-side surface of the first lens.

12. The imaging lens system as claimed in claim 9, wherein,

the imaging lens system satisfies the following conditional expression:

0.002<|R2/R1|<0.080

wherein R1 is the radius of curvature of the object-side surface of the first lens and R2 is the radius of curvature of the image-side surface of the first lens.

13. The imaging lens system as claimed in claim 9, wherein,

The imaging lens system satisfies the following conditional expression:

0.80<|R5/R6|<1.40

wherein R5 is the radius of curvature of the object-side surface of the third lens and R6 is the radius of curvature of the image-side surface of the third lens.

14. The imaging lens system as claimed in claim 9, wherein,

the imaging lens system satisfies the following conditional expression:

12<V4/(Nd1+Nd4)<15

wherein V4 is the abbe number of the fourth lens.

15. The imaging lens system as claimed in claim 9, wherein,

the imaging lens system satisfies the following conditional expression:

2.30<(Nd1+Nd4)/Ndmin<2.40

wherein Ndmin is the minimum value of refractive indexes of the first lens to the eighth lens.

16. The imaging lens system as claimed in claim 9, wherein,

the imaging lens system satisfies the following conditional expression:

59<V1/Nd2+V4/Nd5<62

where V1 is the abbe number of the first lens, V4 is the abbe number of the fourth lens, nd2 is the refractive index of the second lens, and Nd5 is the refractive index of the fifth lens.

17. An imaging lens system comprising:

a first lens having a negative refractive power and a refractive index greater than 1.74 and less than 1.90;

a second lens having a positive refractive power;

a third lens having a positive refractive power;

a fourth lens having a positive refractive power and a refractive index of greater than 1.70 and less than 1.84;

A fifth lens having a negative refractive power;

a sixth lens having a positive refractive power;

a seventh lens having a negative refractive power; and

an eighth lens having a positive refractive power,

wherein the first lens to the eighth lens are disposed in order from the object side at intervals, an

Wherein the imaging lens system has a total of eight lenses.

18. The imaging lens system as claimed in claim 17, wherein,

the first lens has a concave image side surface, and

the second lens has a convex image side.

19. The imaging lens system as claimed in claim 17, wherein,

the third lens has a concave object-side surface,

the fourth lens has a convex object side,

the fifth lens has a concave object-side surface and the sixth lens has a convex object-side surface.

20. The imaging lens system as claimed in claim 17, wherein,

the seventh lens has a concave image side surface, and the eighth lens has a convex object side surface.