Imaging lens system

Abstract

The imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in order from an object side. The imaging lens system satisfies the following conditional expression:-2.6 lt; f1 / f6lt; -2.0, and 0.26 < = f / f4 < = 0.32, where f is a focal length of the imaging lens system, f1 is a focal length of the first lens, f4 is a focal length of the fourth lens, and f6 is a focal length of the sixth lens.

Description

[0001] Cross - reference to related applications

[0002] This application claims the benefit of priority of Korean Patent Application No. 10 - 2023 - 0141899, filed on October 23, 2023, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. Technical field

[0003] The following description relates to an imaging lens system. Background art

[0004] A small surveillance camera can be configured to capture image information within a surveillance area. For example, the small surveillance camera can be mounted on the front bumper, rear bumper, etc. of a vehicle and can provide the captured images to a driver.

[0005] Early small surveillance cameras were designed to capture images of obstacles in neighboring vehicles and thus not only had relatively low resolution but also had a high resolution variation based on temperature changes between - 40°C and 80°C. However, with the growing demand for the autonomous driving function of vehicles, it may be necessary to develop a surveillance camera with high resolution and constant optical characteristics even under harsh temperature conditions.

[0006] The above information is presented as background information only to help understand the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above constitutes prior art with respect to the present disclosure. Summary of the invention

[0007] The Summary of the Invention section is intended to introduce a selection of concepts in a brief form, which will be further described in the Detailed Description section below. The Summary of the Invention section is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter.

[0008] In one general aspect, an imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially arranged from the object side. The imaging lens system satisfies the following conditional expressions: - 2.6 < f1 / f6 < - 2.0, and 0.26 ≤ f / f4 ≤ 0.32, where f is the focal length of the imaging lens system, f1 is the focal length of the first lens, f4 is the focal length of the fourth lens, and f6 is the focal length of the sixth lens.

[0009] The first lens may have a convex object side surface.

[0010] The second lens may have a concave object side surface.

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

[0012] The fourth lens may have a convex object side surface.

[0013] The fifth lens may have a concave object side surface.

[0014] The sixth lens may have a convex object side surface.

[0015] The imaging lens system may have a total of six lenses.

[0016] The first lens may be formed of a glass material.

[0017] The fourth lens may be formed of a glass material.

[0018] In another general aspect, the imaging lens system includes, in order from the object side, a first lens having a negative refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a positive refractive power, a fifth lens having a negative refractive power, and a sixth lens having a positive refractive power. The fourth lens has a convex object side surface and a convex image side surface. The imaging lens system has a total of six lenses and satisfies the following conditional expression: -2.6 < f1 / f6 < -2.0, where f1 is the focal length of the first lens and f6 is the focal length of the sixth lens.

[0019] In another general aspect, the imaging lens system includes, in order from the object side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The imaging lens system satisfies the following conditional expressions: 1.2 < f1 / f2 < 2.0, 1.6 < f3 / f4 < 2.0, and f-number < 2.0, where f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens.

[0020] The first lens may have a convex object side surface.

[0021] The second lens may have a concave object side surface.

[0022] The third lens may have a convex object side surface.

[0023] The fourth lens may have a convex object side surface.

[0024] The fifth lens may have a concave object side surface.

[0025] The sixth lens may have a convex object side surface.

[0026] The imaging lens system may further include a diaphragm disposed between the third lens and the fourth lens.

[0027] The fifth lens and the sixth lens may be arranged such that an image-side surface of the fifth lens and an object-side surface of the sixth lens are cemented together.

[0028] The imaging lens system may have a total of six lenses, and the first lens and the fourth lens may be formed of a glass material.

[0029] Other features and aspects will be apparent from the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a configuration diagram of an imaging lens system according to a first embodiment of the present disclosure.

[0031] Figure 2 yes Figure 1 Aberration curves of the imaging lens system shown.

[0032] Figure 3 is a configuration diagram of an imaging lens system according to a second embodiment of the present disclosure.

[0033] Figure 4 yes Figure 3 Aberration curves of the imaging lens system shown.

[0034] Figure 5 is a configuration diagram of an imaging lens system according to a third embodiment of the present disclosure.

[0035] Figure 6 yes Figure 5 Aberration curves of the imaging lens system shown.

[0036] Figure 7 is a configuration diagram of an imaging lens system according to a fourth embodiment of the present disclosure.

[0037] Figure 8 yes Figure 7 Aberration curves of the imaging lens system shown.

[0038] Fig. 9 is a configuration diagram of an imaging lens system according to a fifth embodiment of the present disclosure.

[0039] Fig.10 yes Fig. 9 Aberration curves of the imaging lens system shown.

[0040] Fig.11 is a configuration diagram of an imaging lens system according to a sixth embodiment of the present disclosure.

[0041] Fig.12 yes Fig.11 Aberration curves of the imaging lens system shown.

[0042] Fig.13 is a configuration diagram of an imaging lens system according to a seventh embodiment of the present disclosure.

[0043] Fig.14 yes Fig.13 Aberration curves of the imaging lens system shown.

[0044] Throughout the drawings and detailed description, unless otherwise described, the same reference numerals refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative sizes, proportions, and depictions of elements in the drawings may be exaggerated. DETAILED DESCRIPTION

[0045] 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.

[0046] The following specific embodiments are provided to help the reader gain a comprehensive understanding of the methods, devices and / or systems described herein. However, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent after understanding the present disclosure. For example, the order of operations described herein is merely an example, and except for operations that must occur in a particular order, it is not limited to the order set forth herein, but can be changed, which will be apparent after understanding the present disclosure. In addition, for greater clarity and brevity, descriptions of features known in the art may be omitted.

[0047] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein are provided merely to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent after understanding the present disclosure.

[0048] Throughout the specification, when an element such as a layer, a region, or a substrate is described as being “on,” “connected to,” or “coupled to” another element, the element may be directly “on,” “connected to,” or “coupled to” the other element, or one or more other elements may be present between the element and the other element. Conversely, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, no other elements may be present between the element and the other element.

[0049] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items; similarly, "at least one" includes any one of the associated listed items and any combination of any two or more items.

[0050] Although terms such as "first", "second" and "third" may be used herein to describe various members, components, regions, layers or portions, these members, components, regions, layers or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer or portion from another member, component, region, layer or portion. Therefore, without departing from the teachings of the examples described herein, the first member, first component, first region, first layer or first portion mentioned in these examples may also be referred to as the second member, second component, second region, second layer or second portion.

[0051] Spatially relative terms such as "above", "above", "below", "below", etc. may be used herein for descriptive convenience to describe the relationship of one element relative to another element as shown in the accompanying drawings. In addition to covering the orientations depicted in the accompanying drawings, these spatially relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the accompanying drawings is flipped, an element described as being "above" or "above" another element relative to the other element will be "below" or "below" the other element relative to the other element. Therefore, depending on the spatial orientation of the device, the term "above" covers both orientations of "above" and "below". The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.

[0052] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the terms "a", "an" and "the" are intended to include plural forms as well. The terms "include", "comprise" and "have" indicate the presence of the features, numbers, operations, components, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, numbers, operations, components, elements and / or combinations thereof.

[0053] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0054] It should be noted that herein, use of the word “may” with respect to an example, such as regarding 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 limited thereto.

[0055] The features of the examples described herein can be combined in various ways that will be apparent after understanding the present disclosure. In addition, although the examples described herein have various configurations, other configurations that will be apparent after understanding the present disclosure are also possible.

[0056] In this specification, the first lens refers to the lens closest to the object (or subject), and the sixth lens refers to the lens closest to the imaging surface (or image sensor). In this specification, the units of the radius of curvature, thickness, TTL (distance from the object side surface of the first lens to the imaging surface), IMGHT (height of the imaging surface), and focal length are expressed in millimeters (mm).

[0057] The thickness of the lens, the gap between lenses, and TTL refer to the distance along the optical axis of the lens. In addition, in the description of the lens shape, a configuration in which one surface is convex means that the paraxial region of the one surface is convex, and a configuration in which one surface is concave means that the paraxial region of the one surface is concave. Therefore, even when one surface of the lens is described as convex, the edge portion of the lens may be concave. Similarly, even when one surface of the lens is described as concave, the edge portion of the lens may be convex.

[0058] According to a first aspect of the present disclosure, an imaging lens system may include a plurality of lenses. For example, according to the first aspect, the imaging lens system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in order from the object side. According to the first aspect, the imaging lens system may satisfy a specific conditional expression. For example, according to the first aspect, the imaging lens system may satisfy the conditional expressions -2.6 < f1 / f6 < -2.0 and 0.26 ≤ f / f4 ≤ 0.32. In the above conditional expressions, f is the focal length of the imaging lens system, f1 is the focal length of the first lens, f4 is the focal length of the fourth lens, and f6 is the focal length of the sixth lens.

[0059] According to a second aspect of the present disclosure, an imaging lens system may include a plurality of lenses. For example, according to the second aspect, the imaging lens system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in order from the object side. According to the second aspect, the imaging lens system may satisfy a specific conditional expression. For example, the imaging lens system according to the second aspect may satisfy the conditional expressions 1.2 < f1 / f2 < 2.0, 1.6 < f3 / f4 < 2.1, and f-number < 2.1. In the above conditional expressions, f2 is the focal length of the second lens, and f3 is the focal length of the third lens.

[0060] The imaging lens system according to the third aspect may include a first lens to a sixth lens arranged in order from the object side, and may satisfy one or more of the following conditional expressions:

[0061] 0.260≤f / f4≤0.320

[0062] 1.20 <f1 / f2<2.0

[0063] -1.20 <f1 / f3<-0.60

[0064] -1.80 <f1 / f4<-1.40

[0065] 2.0 <f1 / f5<2.8

[0066] -2.60 <f1 / f6<-2.0

[0067] -1.20 <f2 / f4<-0.80

[0068] 1.60 <f3 / f4<2.0

[0069] -2.0 <f5 / f6<-0.40

[0070] -1.0<(f1+f2+f3) / (f4+f5+f6)<-0.60

[0071] In the above conditional expressions, f5 is the focal length of the fifth lens.

[0072] The imaging lens system according to the fourth aspect may include first to sixth lenses arranged in order from the object side, and may satisfy one or more of the following conditional expressions:

[0073] 4.0 <R1 / R2<5.0

[0074] 1.0<(R1+R3) / (R2+R4)<2.0

[0075] -1.20<(R7+R10) / (R8+R9)<-0.60

[0076] 0.60 <R10 / R11<1.20

[0077] -1.20 <R10 / R12<-0.80

[0078] -2.40<(R10+R11) / R12<-1.80

[0079] 1.20<(R10-R12) / R11<2.40

[0080] 5.0<(R1+R12) / R11<6.0

[0081] In the above conditional expressions, R1 is the curvature radius of the object side surface of the first lens, R2 is the curvature radius of the image side surface of the first lens, R3 is the curvature radius of the object side surface of the second lens, R4 is the curvature radius of the image side surface of the second lens, R7 is the curvature radius of the object side surface of the fourth lens, R8 is the curvature radius of the image side surface of the fourth lens, R9 is the curvature radius of the object side surface of the fifth lens, R10 is the curvature radius of the image side surface of the fifth lens, R11 is the curvature radius of the object side surface of the sixth lens, and R12 is the curvature radius of the image side surface of the sixth lens.

[0082] According to the fifth aspect, the imaging lens system may include two or more features of the first to fourth aspects. For example, according to the fifth aspect, the imaging lens system may be configured to satisfy one or more conditional expressions according to the fourth aspect while including the features of the first aspect. As another example, according to the fifth aspect, the imaging lens system may be configured to satisfy one or more of the conditional expressions according to the fourth aspect while satisfying one or more of the conditional expressions of the third aspect.

[0083] According to the first to fifth aspects, the imaging lens system may include one or more lenses having the following characteristics as needed. For example, according to the first aspect, the imaging lens system may include one of the first to sixth lenses having the following characteristics. As another example, according to the second aspect, the imaging lens system may include two or more of the first to sixth lenses having the following characteristics. According to the above aspects, the imaging lens system does not necessarily include a lens having the following characteristics. Below, the characteristics of the first to sixth lenses will be described.

[0084] The first lens may have a refractive power. For example, the first lens may have a negative refractive power. The first lens may have a convex shape on one surface. For example, the first lens may have a convex object side surface. The first lens may include a spherical surface or an aspherical surface. For example, both surfaces of the first lens may be spherical. The first lens may be made of a material having high light transmittance and excellent processability. For example, the first lens may be formed of glass. The first lens may be configured to have characteristics that are conducive to improving aberrations. For example, the first lens may have a refractive index of 1.75 or greater and an Abbe number of 45 or greater.

[0085] The second lens may have a refractive power. For example, the second lens may have a negative refractive power. The second lens may have a concave shape on one surface. For example, the second lens may have a concave object side surface. The second lens may include an aspherical surface. For example, both surfaces of the second lens may be aspherical. The second lens may include an inflection point. For example, the inflection point may be formed on the object side surface of the second lens. The second lens may be made of a material having high light transmittance and excellent processability. For example, the second lens may be made of plastic. The second lens may have a predetermined refractive index. For example, the refractive index of the second lens may be 1.6 or less. The second lens may have a predetermined Abbe number. For example, the Abbe number of the second lens may be 54 or greater.

[0086] The third lens may have a refractive power. For example, the third lens may have a positive refractive power. The third lens may have a convex shape on one surface. For example, the third lens may have a convex object side surface. The third lens may include an aspherical surface. For example, both surfaces of the third lens may be aspherical. The third lens may be made of a material having high light transmittance and excellent processability. For example, the third lens may be made of plastic. The third lens may have a predetermined refractive index. For example, the refractive index of the third lens may be 1.6 or greater. The third lens may have a predetermined Abbe number. For example, the Abbe number of the third lens may be greater than 20 and less than 30.

[0087] The fourth lens may have a refractive power. For example, the fourth lens may have a positive refractive power. The fourth lens may have a convex shape on one surface. For example, the fourth lens may have a convex object side surface. The fourth lens may include a spherical surface. For example, both surfaces of the fourth lens may be spherical. The fourth lens may be made of a material having high light transmittance and excellent processability. For example, the fourth lens may be formed of glass. The fourth lens may be configured to have characteristics that are conducive to improving aberrations. For example, the fourth lens may have a refractive index of 1.70 or greater and an Abbe number of 50 or greater.

[0088] The fifth lens may have a refractive power. For example, the fifth lens may have a negative refractive power. The fifth lens may have a concave shape on one surface. For example, the fifth lens may have a concave object side surface. The fifth lens may include an aspherical surface. For example, at least one of the object side surface and the image side surface of the fifth lens may be aspherical. The fifth lens may be made of a material having high light transmittance and excellent processability. For example, the fifth lens may be made of plastic. The fifth lens may have a predetermined refractive index. For example, the refractive index of the fifth lens may be 1.6 or greater. The fifth lens may have a predetermined Abbe number. For example, the Abbe number of the fifth lens may be greater than 20 and less than 30. The fifth lens may be configured to be bonded to the sixth lens. For example, the image side surface of the fifth lens may be bonded to the object side surface of the sixth lens. The fifth lens and the sixth lens are not necessarily configured to be bonded together.

[0089] The sixth lens may have a refractive power. For example, the sixth lens may have a positive refractive power. The sixth lens may have a convex shape on one surface. For example, the sixth lens may have a convex object side surface. The sixth lens may include an aspherical surface. For example, at least one of the object side surface and the image side surface of the sixth lens may be aspherical. The sixth lens may be made of a material having high light transmittance and excellent processability. For example, the sixth lens may be made of plastic. The sixth lens may have a predetermined refractive index. For example, the refractive index of the sixth lens may be greater than 1.5 and less than 1.6. The sixth lens may have a predetermined Abbe number. For example, the Abbe number of the sixth lens may be 50 or greater.

[0090] The aspherical lens constituting the imaging lens system can be expressed by the following equation 1:

[0091]

[0092] 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 an arbitrary point on the aspherical surface to the optical axis, A, B, C, D, E, F, and G are aspherical constants, and Z is the height from a certain point on the aspherical surface to the vertex of the corresponding aspherical surface in the optical axis direction.

[0093] The imaging lens system may include lenses formed of different materials. For example, the first lens and the fourth lens may be formed of materials different from the second lens, the third lens, the fifth lens, and the sixth lens. As a specific example, the first lens and the fourth lens may be formed of a glass material having a low thermal expansion coefficient to external impact and temperature changes, and the second lens, the third lens, the fifth lens, and the sixth lens may be formed of a plastic material that is easy to process. However, the materials of the first lens to the sixth lens are not limited to the above examples. For example, the first lens may be formed of a glass material, and the second lens to the sixth lens may be formed of a plastic material.

[0094] The imaging lens system may include an aperture, an imaging surface, and a filter.

[0095] The aperture may be disposed between the lenses. For example, the aperture may be disposed between the third lens and the fourth lens. As another example, the aperture may be disposed on the image side of a lens having positive refractive power, or between a lens having positive refractive power and a lens having positive refractive power. An imaging plane may be formed at a point where the light refracted by the first lens to the sixth lens forms an image. The imaging plane may be formed by an image sensor. For example, the imaging plane may be formed on the surface of the image sensor or on the inner side of the image sensor. An optical filter may be disposed between the sixth lens and the imaging plane. The optical filter may block light of certain wavelengths. For example, the optical filter may block light of infrared wavelengths.

[0096] Hereinafter, embodiments of the present disclosure will be described in detail based on the attached illustrative drawings.

[0097] First, refer to Figure 1 An imaging lens system according to a first embodiment is described.

[0098] 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 , and a sixth lens 160 .

[0099] The first lens 110 may have a negative refractive power, a convex object side surface, and a concave image side surface. The second lens 120 may have a negative refractive power, a concave object side surface, and a concave image side surface. The third lens 130 may have a positive refractive power, a convex object side surface, and a convex image side surface. The fourth lens 140 may have a positive refractive power, a convex object side surface, and a convex image side surface. The fifth lens 150 may have a negative refractive power, may have a concave object side surface, and a concave image side surface. The sixth lens 160 may have a positive refractive power, a convex object side surface, and a convex image side surface.

[0100] The imaging lens system 100 may further include a stop ST, a filter IF, and an imaging surface IP. The stop ST may be disposed between the third lens 130 and the fourth lens 140. The imaging surface IP may be formed on the image sensor IS, and the filter IF may be disposed between the sixth lens 160 and the imaging surface IP.

[0101] Figure 2 Aberration curves of the imaging lens system according to the present embodiment are shown. Tables 1 and 2 show lens characteristics and aspheric surface values ​​of the imaging lens system according to the present embodiment.

[0102] Table 1

[0103]

[0104]

[0105] Table 2

[0106] Face number S3 S4 S5 S6 S10 S13 k 1.608E+00 2.549E-01 -9.900E+01 -8.773E-02 -2.296E+01 -1.911E-01 A 7.748E-02 6.903E-02 -7.586E-04 -2.373E-05 -3.273E-02 2.367E-02 B -2.999E-02 1.991E-02 6.577E-04 4.954E-03 -1.062E-02 -1.764E-02 C 8.776E-03 -4.455E-02 -5.112E-04 -6.985E-03 3.114E-02 1.842E-02 D -1.657E-03 2.860E-02 8.142E-04 4.026E-03 -3.401E-02 -1.000E-02 E 1.920E-04 -6.958E-03 -4.389E-04 -1.216E-03 2.173E-02 3.151E-03 F -1.251E-05 2.698E-04 6.425E-05 1.855E-04 -7.522E-03 -5.057E-04 G 3.563E-07 6.715E-05 -2.844E-06 -1.093E-05 1.070E-03 3.079E-05

[0107] Reference Figure 3 An imaging lens system according to a second embodiment is described.

[0108] 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 , and a sixth lens 260 .

[0109] The first lens 210 may have a negative refractive power, a convex object side surface, and a concave image side surface. The second lens 220 may have a negative refractive power, a concave object side surface, and a concave image side surface. The third lens 230 may have a positive refractive power, a concave object side surface, and a convex image side surface. The fourth lens 240 may have a positive refractive power, a convex object side surface, and a convex image side surface. The fifth lens 250 may have a negative refractive power, a concave object side surface, and a concave image side surface. The sixth lens 260 may have a positive refractive power, a convex object side surface, and a convex image side surface.

[0110] The imaging lens system 200 may further include a stop ST, a filter IF, and an imaging surface IP. The stop ST may be disposed between the third lens 230 and the fourth lens 240. The imaging surface IP may be formed on the image sensor IS, and the filter IF may be disposed between the sixth lens 260 and the imaging surface IP.

[0111] Figure 4 Aberration curves of the imaging lens system according to the present embodiment are shown. Tables 3 and 4 show lens characteristics and aspheric surface values ​​of the imaging lens system according to the present embodiment.

[0112] Table 3

[0113] Face number part Radius of curvature Thickness / distance Refractive Index Abbe number S1 First lens 13.3570 0.7770 1.7725 49.6 S2 3.0790 1.9550 S3 Second lens -5.1380 0.5320 1.5365 55.9 S4 2.9500 1.3580 S5 The third lens -22.2830 2.8500 1.6142 26.1 S6 -3.1960 1.2870 S7 Aperture infinity 0.0490 S8 The fourth lens 7.0820 1.8560 1.7292 53.9 S9 -3.0540 0.2000 S10 Fifth lens -9.5320 0.4500 1.6561 21.2 S11 1.5790 0.1000 S12 The sixth lens 2.2410 1.7870 1.5168 56 S13 -1.7270 1.3000

[0114] Table 4

[0115] Face number S3 S4 S5 S6 S10 S11 S12 S13 k -5.89E+01 1.30E+00 7.26E+01 -2.29E-01 -8.74E+00 -5.29E+00 4.50E-01 -1.23E-01 A 3.31E-02 7.38E-02 -6.82E-03 1.51E-04 -1.25E-01 -1.95E-02 -7.29E-02 2.96E-02 B -9.84E-03 -2.22E-02 6.58E-04 9.47E-04 6.99E-02 -8.48E-03 -4.93E-03 -1.00E-02 C 1.88E-03 4.64E-03 -1.11E-03 -1.46E-03 -5.52E-02 1.55E-02 1.49E-02 1.07E-02 D -2.23E-04 -7.53E-04 1.54E-04 8.64E-04 3.54E-02 -4.28E-03 -4.11E-03 -4.05E-03 E 1.54E-05 6.51E-05 2.91E-05 -2.17E-04 -9.53E-03 5.45E-05 8.60E-04 F -4.87E-07 -1.18E-11 2.00E-05

[0116] Reference Figure 5 An imaging lens system according to a third embodiment is described.

[0117] 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 , and a sixth lens 360 .

[0118] The first lens 310 may have a negative refractive power, a convex object side surface, and a concave image side surface. The second lens 320 may have a negative refractive power, a concave object side surface, and a concave image side surface. The third lens 330 may have a positive refractive power, a convex object side surface, and a convex image side surface. The fourth lens 340 may have a positive refractive power, a convex object side surface, and a convex image side surface. The fifth lens 350 may have a negative refractive power, a concave object side surface, and a concave image side surface. The sixth lens 360 may have a positive refractive power, a convex object side surface, and a convex image side surface.

[0119] The imaging lens system 300 may further include a stop ST, a filter IF, and an imaging surface IP. The stop ST may be disposed between the third lens 330 and the fourth lens 340. The imaging surface IP may be formed on the image sensor IS, and the filter IF may be disposed between the sixth lens 360 and the imaging surface IP.

[0120] Figure 6 Aberration curves of the imaging lens system according to the present embodiment are shown. Tables 5 and 6 show lens characteristics and aspheric surface values ​​of the imaging lens system according to the present embodiment.

[0121] Table 5

[0122] Face number part Radius of curvature Thickness / distance Refractive Index Abbe number S1 First lens 13.5740 0.7000 1.7725 49.6 S2 2.9580 2.2150 S3 Second lens -2.4130 0.6710 1.5365 56 S4 7.0090 1.0510 S5 The third lens 43.6560 2.7660 1.6142 26 S6 -3.7780 1.6000 S7 Aperture infinity 0.0430 S8 The fourth lens 6.0320 2.0600 1.7292 53.9 S9 -3.0840 0.2000 S10 Fifth lens -7.5110 0.5500 1.6561 21.2 S11 1.7850 0.1000 S12 The sixth lens 2.1630 1.3440 1.5168 56 S13 -2.0240 1.3010

[0123] Table 6

[0124]

[0125]

[0126] Reference Figure 7 An imaging lens system according to a fourth embodiment is described.

[0127] 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 , and a sixth lens 460 .

[0128] The first lens 410 may have a negative refractive power, a convex object side surface, and a concave image side surface. The second lens 420 may have a negative refractive power, a concave object side surface, and a concave image side surface. The third lens 430 may have a positive refractive power, a concave object side surface, and a convex image side surface. The fourth lens 440 may have a positive refractive power, a convex object side surface, and a convex image side surface. The fifth lens 450 may have a negative refractive power, a concave object side surface, and a concave image side surface. The sixth lens 460 may have a positive refractive power, a convex object side surface, and a convex image side surface.

[0129] The imaging lens system 400 may further include a stop ST, a filter IF, and an imaging surface IP. The stop ST may be disposed between the third lens 430 and the fourth lens 440. The imaging surface IP may be formed on the image sensor IS, and the filter IF may be disposed between the sixth lens 460 and the imaging surface IP.

[0130] Figure 8 Aberration curves of the imaging lens system according to the present embodiment are shown. Tables 7 and 8 show lens characteristics and aspheric surface values ​​of the imaging lens system according to the present embodiment.

[0131] Table 7

[0132]

[0133]

[0134] Table 8

[0135] Face number S3 S4 S5 S6 S10 S11 S12 S13 k -5.88E+01 1.30E+00 8.74E+01 -2.19E-01 -8.75E+00 -5.29E+00 4.49E-01 -1.18E-01 A 3.50E-02 8.12E-02 -6.63E-03 -7.58E-04 -1.10E-01 -3.22E-02 -7.84E-02 3.03E-02 B -9.99E-03 -2.28E-02 1.06E-03 1.03E-03 5.36E-02 -5.39E-03 -6.11E-03 -9.82E-03 C 1.87E-03 5.39E-03 -1.39E-03 -1.55E-03 -4.50E-02 1.63E-02 1.56E-02 1.08E-02 D -2.24E-04 -8.20E-04 4.47E-05 8.67E-04 3.38E-02 -4.66E-03 -3.99E-03 -3.98E-03 E 1.55E-05 -3.44E-05 4.39E-05 -2.07E-04 -9.94E-03 8.56E-04 F -4.80E-07 -1.18E-11 1.87E-05

[0136] Reference Fig. 9 An imaging lens system according to a fifth embodiment is described.

[0137] The imaging lens system 500 may include a first lens 510 , a second lens 520 , a third lens 530 , a fourth lens 540 , a fifth lens 550 , and a sixth lens 560 .

[0138] The first lens 510 may have a negative refractive power, a convex object side surface, and a concave image side surface. The second lens 520 may have a negative refractive power, a concave object side surface, and a concave image side surface. The third lens 530 may have a positive refractive power, a convex object side surface, and a convex image side surface. The fourth lens 540 may have a positive refractive power, a convex object side surface, and a convex image side surface. The fifth lens 550 may have a negative refractive power, a concave object side surface, and a concave image side surface. The sixth lens 560 may have a positive refractive power, a convex object side surface, and a convex image side surface.

[0139] The imaging lens system 500 may further include a stop ST, a filter IF, and an imaging surface IP. The stop ST may be disposed between the third lens 530 and the fourth lens 540. The imaging surface IP may be formed on the image sensor IS, and the filter IF may be disposed between the sixth lens 560 and the imaging surface IP.

[0140] Fig.10 Aberration curves of the imaging lens system according to the present embodiment are shown. Tables 9 and 10 show lens characteristics and aspheric surface values ​​of the imaging lens system according to the present embodiment.

[0141] Table 9

[0142] Face number part Radius of curvature Thickness / distance Refractive Index Abbe number S1 First lens 30.2200 1.5400 1.773 49.6 S2 6.8800 4.3800 S3 Second lens -10.8800 1.3400 1.537 56 S4 5.4400 2.9500 S5 The third lens 259.8500 6.2700 1.614 26 S6 -8.0100 2.4900 S7 Aperture infinity 0.7600 S8 The fourth lens 12.8800 3.7900 1.729 53.9 S9 -8.0400 0.4400 S10 Fifth lens -13.0400 0.9900 1.656 21.2 S11 4.7300 0.0100 S12 The sixth lens 4.7300 4.3000 1.537 56 S13 -4.5500 2.8600

[0143] Table 10

[0144] Face number S3 S4 S5 S6 S10 S13 k 1.610E+00 2.550E-01 -9.900E+01 -8.770E-02 -2.300E+01 -1.910E-01 A 7.280E-03 6.480E-03 -7.120E-05 -2.230E-06 -3.070E-03 2.220E-03 B -5.820E-04 3.860E-04 1.280E-05 9.610E-05 -2.060E-04 -3.420E-04 C 3.520E-05 -1.790E-04 -2.050E-06 -2.800E-05 1.250E-04 7.390E-05 D -1.370E-06 2.370E-05 6.740E-07 3.330E-06 -2.820E-05 -8.290E-06 E 3.290E-08 -1.190E-06 -7.510E-08 -2.080E-07 3.720E-06 5.390E-07 F -4.420E-10 9.540E-09 2.270E-09 6.560E-09 -2.660E-07 -1.790E-08 G 2.600E-12 4.910E-10 -2.080E-11 -7.990E-11 7.820E-09 2.250E-10

[0145] Reference Fig.11 An imaging lens system according to a sixth embodiment is described.

[0146] The imaging lens system 600 may include a first lens 610 , a second lens 620 , a third lens 630 , a fourth lens 640 , a fifth lens 650 , and a sixth lens 660 .

[0147] The first lens 610 may have a negative refractive power, a convex object side surface, and a concave image side surface. The second lens 620 may have a negative refractive power, a concave object side surface, and a concave image side surface. The third lens 630 may have a positive refractive power, a convex object side surface, and a convex image side surface. The fourth lens 640 may have a positive refractive power, a convex object side surface, and a convex image side surface. The fifth lens 650 may have a negative refractive power, a concave object side surface, and a concave image side surface. The sixth lens 660 may have a positive refractive power, a convex object side surface, and a convex image side surface.

[0148] The imaging lens system 600 may further include a stop ST, a filter IF, and an imaging surface IP. The stop ST may be disposed between the third lens 630 and the fourth lens 640. The imaging surface IP may be formed on the image sensor IS, and the filter IF may be disposed between the sixth lens 660 and the imaging surface IP.

[0149] Fig.12 Aberration curves of the imaging lens system according to the present embodiment are shown. Tables 11 and 12 show lens characteristics and aspheric surface values ​​of the imaging lens system according to the present embodiment.

[0150] Table 11

[0151] Face number part Radius of curvature Thickness / distance Refractive Index Abbe number S1 First lens 13.7400 0.7000 1.773 49.6 S2 3.1300 1.9900 S3 Second lens -4.8800 0.5980 1.537 56 S4 2.5000 1.3430 S5 The third lens 379.8000 2.8500 1.614 26 S6 -3.5900 1.1590 S7 Aperture infinity 0.3390 S8 The fourth lens 5.7400 1.7280 1.729 53.9 S9 -3.6800 0.2000 S10 Fifth lens -5.6900 0.4500 1.656 21.2 S11 2.1500 0.0020 S12 The sixth lens 2.1500 1.9360 1.537 56 S13 -2.0600 1.3050

[0152] Table 12

[0153]

[0154]

[0155] Reference Fig.13 An imaging lens system according to a seventh embodiment is described.

[0156] 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 , and a sixth lens 760 .

[0157] The first lens 710 may have a negative refractive power, a convex object side surface, and a concave image side surface. The second lens 720 may have a negative refractive power, a concave object side surface, and a concave image side surface. The third lens 730 may have a positive refractive power, a convex object side surface, and a convex image side surface. The fourth lens 740 may have a positive refractive power, a convex object side surface, and a convex image side surface. The fifth lens 750 may have a negative refractive power, a concave object side surface, and a concave image side surface. The sixth lens 760 may have a positive refractive power, a convex object side surface, and a convex image side surface.

[0158] The imaging lens system 700 may further include a stop ST, a filter IF, and an imaging surface IP. The stop ST may be disposed between the third lens 730 and the fourth lens 740. The imaging surface IP may be formed on the image sensor IS, and the filter IF may be disposed between the sixth lens 760 and the imaging surface IP.

[0159] Fig.14 Aberration curves of the imaging lens system according to the present embodiment are shown. Table 13 and Table 14 show lens characteristics and aspheric surface values ​​of the imaging lens system according to the present embodiment.

[0160] Table 13

[0161]

[0162]

[0163] Table 14

[0164] Face number S3 S4 S5 S6 S10 S13 k 5.760E+01 -3.950E-01 9.500E+01 5.460E-03 -3.430E+01 -1.550E-01 A 4.120E-02 3.680E-02 -2.860E-03 -4.250E-04 -4.290E-02 2.030E-02 B -2.020E-02 1.730E-02 -6.030E-03 2.150E-03 8.280E-03 -1.600E-03 C 7.190E-03 -5.980E-02 6.770E-03 -2.140E-03 -6.230E-03 -3.670E-03 D -1.550E-03 6.010E-02 -2.820E-03 7.810E-04 1.630E-02 6.600E-03 E 2.010E-04 -2.940E-02 2.670E-04 -1.880E-04 -1.790E-02 -3.880E-03 F -1.460E-05 7.670E-03 1.530E-04 3.540E-05 8.780E-03 1.070E-03 G 4.560E-07 -8.530E-04 -4.240E-05 -3.010E-06 -1.650E-03 -1.150E-04

[0165] Tables 15 to 17 show optical characteristic values ​​and conditional expression values ​​of the imaging lens systems according to the first to seventh embodiments.

[0166] Table 15

[0167]

[0168] Table 16

[0169]

[0170]

[0171] Table 17

[0172]

[0173] The present disclosure can provide an imaging lens system that can achieve high resolution while achieving constant optical characteristics (focal length) over a wide temperature range.

[0174] One or more embodiments of the present disclosure may provide an imaging lens system capable of achieving high resolution by using both a plastic lens and a glass lens while minimizing the magnitude of focus variation due to rapid temperature deviation.

[0175] Although specific examples have been shown and described above, it will be apparent after 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 understood in a descriptive sense only and not for limiting purposes. The description of the features or aspects in each example should be considered to be applicable to similar features or aspects in other examples. If the described techniques are performed in a different order, and / or if the components in the described system, architecture, device or circuit are replaced or supplemented in a different manner and / or by other components or their equivalents, appropriate results can still be achieved. Therefore, the scope of the present disclosure is not limited by specific embodiments, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in the present disclosure.

Claims

1. An imaging lens system, comprising: A first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially arranged from the object side, wherein, the imaging lens system satisfies the following conditional expressions: -2.6 < f1 / f6 < -2.0, and 0.26 ≤ f / f4 ≤ 0.32, wherein, f is the focal length of the imaging lens system, f1 is the focal length of the first lens, f4 is the focal length of the fourth lens, and f6 is the focal length of the sixth lens, and wherein, at least one of the first lens to the sixth lens includes an aspherical surface.

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

3. The imaging lens system according to claim 1, wherein: The second lens has a concave object side surface.

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

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

6. The imaging lens system according to claim 1, wherein: The fifth lens has a concave object side surface.

7. The imaging lens system according to claim 1, wherein: The sixth lens has a convex object side surface.

8. The imaging lens system according to claim 1, wherein: The imaging lens system has a total of six lenses.

9. The imaging lens system according to claim 1, wherein: The first lens and the fourth lens are formed of a glass material.

10. An imaging lens system, comprising: A first lens with negative refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power, and a sixth lens with positive refractive power sequentially arranged from the object side, wherein, the fourth lens has a convex object side surface and a convex image side surface, wherein, the imaging lens system has a total of six lenses and satisfies the following conditional expressions: -2.6 < f1 / f6 < -2.0, wherein, f1 is the focal length of the first lens, and f6 is the focal length of the sixth lens, and wherein, at least one of the first lens to the sixth lens includes an aspherical surface.

11. An imaging lens system, comprising: A first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially arranged from the object side, wherein, the imaging lens system satisfies the following conditional expressions: 1.2 < f1 / f2 < 2.0, 1.6 < f3 / f4 < 2.0, and f-number < 2.0, wherein, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens, and wherein, at least one of the first lens to the sixth lens includes an aspherical surface.

12. The imaging lens system according to claim 11, wherein: The first lens has a convex object side surface.

13. The imaging lens system according to claim 11, wherein: The second lens has a concave object side surface.

14. The imaging lens system according to claim 11, wherein: The third lens has a convex object side surface.

15. The imaging lens system according to claim 11, wherein: The fourth lens has a convex object side surface.

16. The imaging lens system according to claim 11, wherein: The fifth lens has a concave object side surface.

17. The imaging lens system according to claim 11, wherein: The sixth lens has a convex object side surface.

18. The imaging lens system according to claim 11, further comprising a diaphragm disposed between the third lens and the fourth lens.

19. The imaging lens system according to claim 11, wherein: The fifth lens and the sixth lens are arranged such that the image side surface of the fifth lens and the object side surface of the sixth lens are joined together.

20. The imaging lens system of claim 11, wherein: The imaging lens system has a total of six lenses, and the first lens and the fourth lens are formed of a glass material.

Images