Imaging lens system

Abstract

The present application relates to an imaging lens system including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens disposed in sequence with intervals from an object side of the imaging lens system. The imaging lens system satisfies 1.5 < Nd5 < 1.6, 30 < V5 < 50, and TTL / 2IH < 0.730, where Nd5 is a refractive index of the fifth lens, V5 is an Abbe number of the fifth lens, TTL is a distance from an object side surface of the first lens to an image plane, and 2IH is a diagonal length of the image plane.

Description

[0001] Cross-reference to related applications

[0002] This application claims the priority benefit of Korean Patent Application No. 10-2019-0071406, filed with the Korean Intellectual Property Office on June 17, 2019, 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 including seven lenses. Background art

[0004] A compact camera can be mounted on a wireless terminal. For example, the compact camera can be mounted on the front surface and the rear surface of the wireless terminal, respectively. Such a compact camera is used for various purposes, such as outdoor landscape photography, indoor portrait photography, etc., and thus requires performance not inferior to that of a general camera. However, since the small camera is limited in the mounting space due to the size of the wireless terminal, it is difficult to achieve high performance. Therefore, it is necessary to develop an imaging lens system that can improve the performance of the compact camera without increasing the size of the compact camera. Summary of the invention

[0005] The present Summary of the Invention section is intended to introduce, in a brief form, a selection of inventive concepts, which will be further described in the Detailed Description section below. The present 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 assist in determining the scope of the claimed subject matter.

[0006] In one 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, and a seventh lens sequentially arranged at intervals from the object side of the imaging lens system. The imaging lens system satisfies 1.5 < Nd5 < 1.6, 30 < V5 < 50, and TTL / 2IH < 0.730, where Nd5 is the refractive index of the fifth lens, V5 is the Abbe number of the fifth lens, TTL is the distance from the object side surface of the first lens to the imaging surface, and 2IH is the diagonal length of the imaging surface.

[0007] The imaging lens system may satisfy -10 < V1 - V3 < 10, where V1 is the Abbe number of the first lens, and V3 is the Abbe number of the third lens.

[0008] The imaging lens system may satisfy 25 < V1 - V4 < 45, where V1 is the Abbe number of the first lens, and V4 is the Abbe number of the fourth lens.

[0009] The imaging lens system may satisfy 0 < V1 - V5 < 20, where V1 is the Abbe number of the first lens.

[0010] The refractive index of the fourth lens may be greater than 1.6.

[0011] The imaging lens system may satisfy 1.5 < f3 / f, where f is the focal length of the imaging lens system and f3 is the focal length of the third lens.

[0012] The fourth lens may have a negative refractive power.

[0013] The fifth lens may have a convex shape on the object side.

[0014] The imaging lens system may have an F-number of 2.0 or less.

[0015] In another general aspect, the imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially arranged at intervals from the object side of the imaging lens system. The object side surface of the fourth lens is concave or the object side surface of the fifth lens is convex, and the F-number is 2.0 or less. The imaging lens system satisfies TTL / 2IH < 0.73, where TTL is the distance from the object side surface of the first lens to the imaging surface and 2IH is the diagonal length of the imaging surface.

[0016] The third lens may have a positive refractive power.

[0017] The fifth lens may have a concave shape on the image side.

[0018] The seventh lens may have a concave shape on the object side.

[0019] The refractive index of the fifth lens may be greater than 1.5 and less than 1.6.

[0020] The imaging lens system may satisfy -10 < V1 - V3 < 10, where V1 is the Abbe number of the first lens and V3 is the Abbe number of the third lens.

[0021] The imaging lens system may satisfy 0 < V1 - V5 < 20, where V5 is the Abbe number of the fifth lens.

[0022] The refractive power of the first lens may be greater than that of the third lens, and the refractive power of the sixth lens may be greater than that of the third lens.

[0023] The first lens may have a positive refractive power, the second lens may have a negative refractive power, the third lens may have a positive refractive power, the fourth lens may have a negative refractive power, the sixth lens may have a positive refractive power, and the seventh lens may have a negative refractive power.

[0024] Other features and aspects will become apparent from the following detailed description, the drawings, and the appended claims. Description of the Drawings

[0025] Figure 1 It is a configuration diagram of the imaging lens system based on the first example.

[0026] Figure 2 It shows Figure 1 The aberration curves of the imaging lens system are shown.

[0027] Figure 3 It is a configuration diagram of the imaging lens system based on the second example.

[0028] Figure 4 It shows Figure 3 The aberration curves of the imaging lens system are shown.

[0029] Figure 5 It is a configuration diagram of the imaging lens system based on the third example.

[0030] Figure 6 It shows Figure 5 The aberration curves of the imaging lens system are shown.

[0031] Figure 7 It is a configuration diagram of the imaging lens system based on the fourth example.

[0032] Figure 8 It shows Figure 7 The aberration curves of the imaging lens system are shown.

[0033] Figure 9 It is a configuration diagram of the imaging lens system based on the fifth example.

[0034] Figure 10 It shows Figure 9 The aberration curves of the imaging lens system are shown.

[0035] Figure 11 It is a configuration diagram of the imaging lens system based on the sixth example.

[0036] Figure 12 It shows Figure 11 The aberration curves of the imaging lens system are shown.

[0037] Throughout the accompanying drawings and detailed embodiments, 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 dimensions, scale, and depiction of elements in the drawings may be exaggerated. Detailed Implementation

[0038] The following detailed embodiments are provided to help readers gain a comprehensive understanding of the methods, apparatus, and / or systems described in this application. However, various changes, modifications, and equivalents to the methods, apparatus, and / or systems described in this application will be apparent to those skilled in the art. The order of operations described in this application is merely illustrative, and is not limited to the order set forth in this application, except for operations that must occur in a specific order, and can be varied, as will be apparent to those skilled in the art. Furthermore, for clarity and conciseness, descriptions of functions and structures well-known to those skilled in the art may be omitted.

[0039] The features described in this application may be implemented in various forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art.

[0040] It should be noted that in this application, the term "may" is used in relation to examples or implementations, such as with regard to what an example or implementation may include or implement, meaning that there exists at least one example or implementation that includes or implements such features, and that all examples and implementations are not limited thereto.

[0041] Throughout this specification, when an element such as a layer, region, or substrate is described as being "on," "connected to," or "attached to" another element, the element may be directly "on," directly "connected to," or directly "attached to" the other element, or there may be one or more other elements between the element and the other element. Conversely, when an element is described as being "directly on," "directly connected to," or "directly attached to" another element, there may be no other elements between the element and the other element.

[0042] As used in this application, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0043] Although terms such as “first,” “second,” and “third” may be used in this application to describe various components, parts, regions, layers, or portions, these components, parts, regions, layers, or portions are not limited by these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or portion from another. Therefore, without departing from the teachings of the examples described in this application, the first component, first part, first region, first layer, or first portion mentioned in these examples may also be referred to as a second component, second part, second region, second layer, or second portion.

[0044] Spatial relative terms such as “above,” “above,” “below,” and “below” may be used in this application for descriptive convenience to describe the relationship of one element relative to another, as shown in the accompanying drawings. In addition to covering the orientation depicted in the drawings, these spatial relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “above” another element would be located “below” or “below” that other element. Thus, depending on the spatial orientation of the device, the term “above” covers both “above” and “below” orientations. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used in this application should be interpreted accordingly.

[0045] The terminology used in this application is for describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the articles “a,” “an,” and “the” are intended to include plural forms as well. The terms “comprising,” “including,” and “having” indicate the presence of the stated features, numbers, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, components, elements, and / or combinations thereof.

[0046] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the accompanying drawings may occur. Therefore, the examples described in this application are not limited to the specific shapes shown in the accompanying drawings, but include shape variations that occur during manufacturing.

[0047] The features of the examples described in this application can be combined in various ways that will become apparent after understanding the disclosure of this application. Furthermore, although the examples described in this application have multiple configurations, other configurations that will become apparent after understanding the disclosure of this application are also possible.

[0048] In this application, the first lens refers to the lens closest to the object (or target), and the seventh lens refers to the lens closest to the imaging surface (or image sensor). In this application, the units for the radius of curvature, thickness, TTL (distance from the object side of the first lens to the imaging surface), 2IH (diagonal length of the imaging surface), IH (half of 2IH), and focal length of the lens can be millimeters (mm).

[0049] The lens thickness, the distance between lenses, and the TTL (Time to Light) are the distances along the optical axis of the lenses. In the description of each lens shape, a convex shape of a facet can mean that the paraxial region of that facet can bulge, and a concave shape of a facet can mean that the paraxial region of that facet can be concave. Therefore, even when a facet of a lens is described as having a convex shape, the edge portion of the lens can be concave. Similarly, even when a facet of a lens is described as having a concave shape, the edge portion of the lens can bulge.

[0050] The imaging lens system includes seven lenses. For example, the imaging lens system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially from the object side. The first through seventh lenses are arranged with a predetermined interval between consecutive / adjacent lenses. For example, each lens does not contact the image-side and object-side of adjacent lenses in the paraxial region. The F-number of the imaging lens system may be 2.0 or less.

[0051] The first lens has refractive power. For example, the first lens has positive refractive power. The first lens has a convex shape on one surface. For example, the first lens has a convex shape on the object-side surface.

[0052] The first lens includes an aspherical surface. For example, both surfaces of the first lens may be aspherical. The first lens may be made of a material with high light transmittance and excellent machinability. For example, the first lens may be made of a plastic material. The first lens has a low refractive index. For example, the refractive index of the first lens may be less than 1.6.

[0053] The second lens has refractive power. For example, the second lens may have negative refractive power. The second lens has a convex shape on one surface. For example, the second lens may have a convex shape on the object side surface.

[0054] The second lens includes an aspherical surface. For example, both surfaces of the second lens may be aspherical. The second lens may be made of a material with high light transmittance and excellent machinability. For example, the second lens may be made of a plastic material. However, the material of the second lens is not limited to plastic. For example, the second lens may be made of a non-plastic material. The second lens has a refractive index greater than that of the first lens. For example, the refractive index of the second lens may be 1.6 or greater. Furthermore, the lower limit of the refractive index of the second lens may be further increased. For example, the refractive index of the second lens may be 1.67 or greater.

[0055] The third lens has refractive power. For example, the third lens has positive refractive power. At least one surface of the third lens may have a convex shape. For example, the third lens may have a convex shape on the object-side surface.

[0056] The third lens includes an aspherical surface. For example, two surfaces of the third lens may be aspherical. The third lens may be made of a material with high light transmittance and excellent machinability. For example, the third lens may be made of a plastic material. The third lens has a refractive index substantially similar to that of the first lens. For example, the refractive index of the third lens may be less than 1.6.

[0057] The fourth lens has refractive power. For example, the fourth lens has negative refractive power. The fourth lens has a concave shape on one surface. For example, the fourth lens may have a concave shape on the object side.

[0058] The fourth lens includes an aspherical surface. For example, two surfaces of the fourth lens may be aspherical. The fourth lens may be made of a material with high light transmittance and excellent machinability. For example, the fourth lens may be made of a plastic material. The fourth lens has a refractive index greater than that of the first lens. For example, the refractive index of the fourth lens may be 1.6 or greater.

[0059] The fifth lens has refractive power. For example, the fifth lens may have positive or negative refractive power. The fifth lens has a convex shape on one surface. For example, the fifth lens may have a convex shape on the object-side surface. The fifth lens may have a shape including a curvature point. For example, the curvature point may be formed on at least one surface of the fifth lens, either the object-side surface or the image-side surface.

[0060] The fifth lens includes an aspherical surface. For example, both surfaces of the fifth lens may be aspherical. The fifth lens may be made of a material with high light transmittance and excellent machinability. For example, the fifth lens may be made of a plastic material. The fifth lens may have a refractive index substantially similar to that of the first lens. For example, the refractive index of the fifth lens may be less than 1.6. As another example, the refractive index of the fifth lens may be greater than 1.5 and less than 1.6. The Abbe number of the fifth lens may be greater than 30 and less than 50.

[0061] The sixth lens has refractive power. For example, the sixth lens has positive refractive power. The sixth lens has a convex shape on one surface. For example, the sixth lens may have a convex shape on the object-side surface. The sixth lens may have a shape including a curvature point. For example, the curvature point may be formed on at least one surface of the sixth lens, the object-side surface and the image-side surface.

[0062] The sixth lens includes an aspherical surface. For example, both surfaces of the sixth lens may be aspherical. The sixth lens may be made of a material with high light transmittance and excellent machinability. For example, the sixth lens may be made of a plastic material. The sixth lens may have a refractive index substantially similar to that of the fifth lens. For example, the refractive index of the sixth lens may be less than 1.6.

[0063] The seventh lens has refractive power. For example, the seventh lens has negative refractive power. The seventh lens may have a concave shape on at least one surface. For example, the seventh lens may have a concave shape on the object-side surface. The seventh lens may have a shape including inflection points. For example, one or more inflection points may be formed on at least one surface of the seventh lens, the object-side surface and the image-side surface.

[0064] The seventh lens includes an aspherical surface. For example, both surfaces of the seventh lens may be aspherical. The seventh lens may be made of a material with high light transmittance and excellent machinability. For example, the seventh lens may be made of plastic. The seventh lens may have a refractive index substantially similar to that of the sixth lens. For example, the refractive index of the seventh lens may be less than 1.6.

[0065] As described above, the first to seventh lenses include aspherical surfaces. The aspherical surfaces of the first to seventh lenses can be represented by the following Equation 1.

[0066] Equation 1

[0067]

[0068] In Equation 1, c is the reciprocal of the radius of curvature of the lens, k is the conic constant, r is the distance from any point on the aspherical surface to the optical axis, A to J are aspherical surface constants, and Z (or SAG) is the height from any point on the aspherical surface to the vertex of the aspherical surface in the direction of the optical axis.

[0069] The imaging lens system also includes filters, image sensors, and apertures.

[0070] A filter is positioned between the seventh lens and the image sensor. The filter blocks certain wavelengths of light; for example, it blocks infrared wavelengths. The image sensor forms an imaging surface on which light refracted through the first and seventh lenses is refracted. The image sensor converts optical signals into electrical signals. For example, it can convert incident light signals onto the imaging surface into electrical signals. An aperture is provided to adjust the amount of light incident on the lenses. For example, the aperture may be positioned between the first and second lenses or between the second and third lenses.

[0071] An imaging lens system can satisfy at least one of the following conditional expressions.

[0072] Conditional expression 1:0 <f1 / f<2.0

[0073] Conditional expression 2:25 <V1-V2<45

[0074] Conditional expression 3: -10 <V1-V3<10

[0075] Conditional expression 4:25 <V1-V4<45

[0076] Conditional expression 5:0 <V1-V5<20

[0077] Conditional expression 6: -3.5 <f2 / f<0

[0078] Conditional expression 7:1.5 <f3 / f

[0079] Conditional expression 8: f4 / f<0

[0080] Conditional expression 9: f5 / f<0

[0081] Conditional expression 10:0 <f6 / f

[0082] Conditional expression 11: f7 / f<0

[0083] Conditional expression 12: TTL / f < 1.4

[0084] Conditional expression 13: -1.0 <f1 / f2<0

[0085] Conditional expression 14: -2.0 <f2 / f3<0

[0086] Conditional expression 15: BFL / f < 0.4

[0087] Conditional expression 16: D12 / f < 0.1

[0088] Conditional expression 17: SD5 / IH < 0.6

[0089] Conditional expression 18:0.7 <SD6 / IH

[0090] Conditional expression 19:0.8 <SD7 / IH

[0091] Conditional expression 20: TTL / 2IH < 0.730

[0092] Conditional expression 21:30 <V5<50

[0093] In an imaging lens system, the refractive power of the first lens is greater than that of the third lens, and the refractive power of the sixth lens is greater than that of the third lens. For example, the first, third, and sixth lenses can satisfy all of the following conditional expressions.

[0094] Conditional expression 22: 1 / f3 < 1 / f1

[0095] Conditional expression 23: 1 / f3 < 1 / f6

[0096] In the 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, f3 is the focal length of the third 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, and f7 is the focal length of the seventh lens; V1 is the Abbe number of the first lens, V2 is the Abbe number of the second lens, V3 is the Abbe number of the third lens, V4 is the Abbe number of the fourth lens, and V5 is the Abbe number of the fifth lens; TTL is the distance from the object side of the first lens to the image plane; BFL is the distance from the image side of the seventh lens to the image plane; D12 is the distance from the image side of the first lens to the object side of the second lens; SD5 is the effective radius of the fifth lens; SD6 is the effective radius of the sixth lens; SD7 is the effective radius of the seventh lens; and 2IH is the diagonal length of the image plane.

[0097] Condition 1 defines the appropriate refractive power of the first lens. A first lens outside the range of the condition expressions increases the focal length of the imaging lens system, making miniaturization difficult. Conditions 2 through 5 define the conditions for reducing chromatic aberration in the imaging lens system. Conditions 6 through 11 define the appropriate refractive power of the second through seventh lenses, respectively. Lenses outside the range of the condition expressions are too high or too low to correct aberrations with each lens. Conditions 12 and 15 define the conditions for miniaturizing the imaging lens system. Imaging lens systems outside the upper limits of the condition expressions are unsuitable for portable terminals because the distance from the object side of the first lens to the imaging plane is outside the range suitable for mounting on a portable terminal, or the focal length of the imaging lens system is too short. Conditions 13 and 14 define the appropriate focal lengths of the first through third lenses. Lenses outside the values ​​of the condition expressions can lead to deterioration of aberration characteristics because the refractive power of the lens may be too high. Condition 16 defines the conditions for reducing chromatic aberration with the first and second lenses. For example, if the distance between the first and second lenses is outside the upper limit of the conditional expression, it is difficult to improve chromatic aberration based on the Abbe number deviation between the first and second lenses. Conditional expressions 17 to 19 are conditions used to reduce halo effects. If the effective radii of the fifth to seventh lenses are outside the upper or lower limit of the conditional expression, the sweep angle of each lens widens, potentially degrading halo characteristics.

[0098] Reference Figure 1 The imaging lens system according to the first example is described.

[0099] 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, and a seventh lens 170.

[0100] The first lens 110 has positive refractive power and a convex shape on the object-side surface and a concave shape on the image-side surface. The second lens 120 has negative refractive power and a convex shape on the object-side surface and a concave shape on the image-side surface. The third lens 130 has positive refractive power and a convex shape on both the object-side and image-side surfaces. The fourth lens 140 has negative refractive power and a concave shape on both the object-side and image-side surfaces. The fifth lens 150 has negative refractive power and a convex shape on both the object-side and image-side surfaces. Additionally, the fifth lens 150 has shapes that form inflection points on both the object-side and image-side surfaces. The sixth lens 160 has positive refractive power and a convex shape on both the object-side and image-side surfaces. Furthermore, the sixth lens 160 has a shape that forms inflection points on both the object-side and image-side surfaces. The seventh lens 170 has negative refractive power and has a concave shape on both the object-side and image-side surfaces. Additionally, the seventh lens 170 has a shape that forms inflection points on both the object-side and image-side surfaces.

[0101] The imaging lens system 100 also includes a filter 180 and an image sensor 190. The filter 180 is disposed between the seventh lens 170 and the image sensor 190. For reference, although not shown in the figures, an aperture stop may be disposed between the second lens 120 and the third lens 130.

[0102] The imaging lens system 100 configured as described above shows, for example... Figure 2 The aberration characteristics are shown in Tables 1 and 2. Tables 1 and 2 show the lens characteristics and aspherical surface values ​​of the imaging lens system 100.

[0103] Table 1

[0104] Face number refer to radius of curvature Thickness / Distance Refractive index Abbe number S1 First lens 2.31 0.912 1.544 56.1 S2 10.53 0.164 S3 Second lens 6.94 0.234 1.671 19.3 S4 3.85 0.422 S5 Third lens 29.14 0.398 1.544 56.1 S6 -24.16 0.264 S7 Fourth lens -15.48 0.384 1.661 20.4 S8 60.01 0.421 S9 Fifth lens 6.03 0.391 1.568 37.4 S10 5.66 0.341 S11 Sixth lens 3.16 0.721 1.544 56.1 S12 -6.06 0.608 S13 Seventh Lens -4.75 0.400 1.544 56.1 S14 2.67 0.305 S15 Filter infinity 0.210 1.514 64.1 S16 infinity 0.505 Imaging surface Imaging surface infinity 0.015

[0105] Table 2

[0106] Example 1 K A B C D E F G H J S1 -1.0366 0.0116 -0.0008 0.0048 -0.0062 0.0047 -0.0020 0.0005 -4.53E-05 0 S2 23.6958 -0.0234 0.0212 -0.0193 0.0153 -0.0096 0.0038 -0.0008 0.0001 0 S3 14.9297 -0.0630 0.0570 -0.0346 0.0148 -0.0034 -0.0002 0.0004 -0.0001 0 S4 0.1548 -0.0490 0.0678 -0.0816 0.1019 -0.0934 0.0551 -0.0183 0.0027 0 S5 0 -0.0423 0.0589 -0.1884 0.3228 -0.3302 0.1974 -0.0637 0.0086 0 S6 1.2398 -0.0405 0.0131 -0.0336 0.0382 -0.0292 0.0134 -0.0031 0.0003 0 S7 0.00E+00 -0.0791 0.0820 -0.1699 0.2105 -0.1653 0.0785 -0.0206 0.0023 0 S8 0.00E+00 -0.0733 0.0632 -0.0860 0.0773 -0.0452 0.0163 -0.0033 0.0003 0 S9 0.00E+00 -0.1024 0.0794 -0.0551 0.0259 -0.0082 0.0017 -0.0002 1.10E-05 0 S10 -64.3279 -0.1135 0.0639 -0.0370 0.0160 -0.0045 0.0008 -0.0001 3.26E-06 0 S11 -6.4594 -0.0209 0.0062 -0.0036 0.0001 0.0002 -4.09E-05 3.12E-06 -8.70E-08 0 S12 -96.2611 0.0152 0.0068 -0.0073 0.0021 -0.0003 2.36E-05 -9.62E-07 1.55E-08 0 S13 -8.2127 -0.0827 0.0327 -0.0059 0.0006 -3.90E-05 1.43E-06 -2.71E-08 1.86E-10 0 S14 -13.2198 -0.0455 0.0159 -0.0036 0.0005 -4.84E-05 2.91E-06 -1.07E-07 2.19E-09 0

[0107] Reference Figure 3 The imaging lens system according to the second example is described.

[0108] 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, and a seventh lens 270.

[0109] The first lens 210 has positive refractive power and a convex shape on the object-side surface and a concave shape on the image-side surface. The second lens 220 has negative refractive power and a convex shape on the object-side surface and a concave shape on the image-side surface. The third lens 230 has positive refractive power and a convex shape on both the object-side and image-side surfaces. The fourth lens 240 has negative refractive power and a concave shape on both the object-side and image-side surfaces. The fifth lens 250 has negative refractive power and a convex shape on both the object-side and image-side surfaces. Additionally, the fifth lens 250 has shapes that form inflection points on both the object-side and image-side surfaces. The sixth lens 260 has positive refractive power and a convex shape on both the object-side and image-side surfaces. Furthermore, the sixth lens 260 has a shape that forms inflection points on both the object-side and image-side surfaces. The seventh lens 270 has negative refractive power and has a concave shape on both the object-side and image-side surfaces. Additionally, the seventh lens 270 has a shape that forms inflection points on both the object-side and image-side surfaces.

[0110] The imaging lens system 200 also includes a filter 280 and an image sensor 290. The filter 280 is disposed between the seventh lens 270 and the image sensor 290. For reference, although not shown in the figures, an aperture stop may be disposed between the second lens 220 and the third lens 230.

[0111] Imaging lens system 200 shows, for example Figure 4 The aberration characteristics are shown in Tables 3 and 4. Tables 3 and 4 show the lens characteristics and aspherical surface values ​​of the imaging lens system 200.

[0112] Table 3

[0113]

[0114]

[0115] Table 4

[0116] Example 2 K A B C D E F G H J S1 -1.0458 0.0110 0.0016 0.0001 -0.0010 0.0013 -0.0008 0.0002 -2.34E-05 -1.89E-11 S2 23.3325 -0.0237 0.0220 -0.0210 0.0169 -0.0102 0.0039 -0.0008 0.0001 -1.89E-11 S3 14.9068 -0.0626 0.0550 -0.0321 0.0139 -0.0039 0.0005 0.0001 -4.75E-05 -1.89E-11 S4 0.1571 -0.0490 0.0681 -0.0849 0.1100 -0.1027 0.0608 -0.0201 0.0029 -1.89E-11 S5 0 -0.0435 0.0688 -0.2161 0.3638 -0.3653 0.2149 -0.0683 0.0091 -1.89E-11 S6 13.4162 -0.0370 0.0024 -0.0147 0.0143 -0.0093 0.0034 -0.0004 -4.30E-05 -1.89E-11 S7 0 -0.0731 0.0587 -0.1264 0.1595 -0.1292 0.0637 -0.0174 0.0020 -1.89E-11 S8 0 -0.0725 0.0621 -0.0871 0.0798 -0.0473 0.0173 -0.0035 0.0003 -1.89E-11 S9 0 -0.1048 0.0841 -0.0600 0.0290 -0.0096 0.0021 -0.0003 1.49E-05 -1.89E-11 S10 -63.2478 -0.1133 0.0633 -0.0349 0.0141 -0.0038 0.0006 -0.0001 2.56E-06 -1.89E-11 S11 -6.5212 -0.0205 0.0060 -0.0035 0.0001 0.0002 -3.94E-05 2.98E-06 -8.24E-08 -1.89E-11 S12 -98.4791 0.0159 0.0055 -0.0065 0.0019 -0.0003 2.00E-05 -7.81E-07 1.18E-08 -1.89E-11 S13 -7.8013 -0.0814 0.0318 -0.0057 0.0006 -3.69E-05 1.34E-06 -2.46E-08 1.48E-10 -1.89E-11 S14 -13.1752 -0.0450 0.0157 -0.0036 0.0005 -0.0001 3.37E-06 -1.37E-07 3.16E-09 -3.20E-11

[0117] Reference Figure 5 Describe the imaging lens system according to the third example.

[0118] 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, and a seventh lens 370.

[0119] The first lens 310 has positive refractive power and a convex shape on the object-side surface and a concave shape on the image-side surface. The second lens 320 has negative refractive power and a convex shape on the object-side surface and a concave shape on the image-side surface. The third lens 330 has positive refractive power and a convex shape on the object-side surface and a concave shape on the image-side surface. The fourth lens 340 has negative refractive power and a concave shape on both the object-side and image-side surfaces. The fifth lens 350 has positive refractive power and a convex shape on both the object-side and image-side surfaces. Additionally, the fifth lens 350 has shapes that form inflection points on both the object-side and image-side surfaces. The sixth lens 360 has positive refractive power and a convex shape on both the object-side and image-side surfaces. Furthermore, the sixth lens 360 has a shape that forms inflection points on both the object-side and image-side surfaces. The seventh lens 370 has negative refractive power and has a concave shape on both the object-side and image-side surfaces. Additionally, the seventh lens 370 has a shape that forms inflection points on both the object-side and image-side surfaces.

[0120] The imaging lens system 300 also includes a filter 380 and an image sensor 390. The filter 380 is disposed between the seventh lens 370 and the image sensor 390. For reference, although not shown in the figures, an aperture stop may be disposed between the second lens 320 and the third lens 330.

[0121] Imaging lens system 300 shows, for example Figure 6 The aberration characteristics are shown in Tables 5 and 6. Tables 5 and 6 show the lens characteristics and aspherical surface values ​​of the imaging lens system 300.

[0122] Table 5

[0123] Face number refer to radius of curvature Thickness / Distance Refractive index Abbe number S1 First lens 2.31 0.872 1.544 56.1 S2 9.70 0.188 S3 Second lens 6.75 0.230 1.671 19.3 S4 3.80 0.489 S5 Third lens 16.19 0.385 1.544 56.1 S6 167.06 0.300 S7 Fourth lens -23.80 0.305 1.661 20.4 S8 40.38 0.366 S9 Fifth lens 5.35 0.370 1.568 37.4 S10 5.32 0.395 S11 Sixth lens 3.24 0.686 1.544 56.1 S12 -6.56 0.717 S13 Seventh Lens -3.58 0.400 1.544 56.1 S14 3.42 0.305 S15 Filter infinity 0.210 1.514 64.1 S16 infinity 0.467 Imaging surface Imaging surface infinity 0.015

[0124] Table 6

[0125]

[0126]

[0127] Reference Figure 7 Describe the imaging lens system according to the fourth example.

[0128] 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, and a seventh lens 470.

[0129] The first lens 410 has positive refractive power and a convex shape on the object-side surface and a concave shape on the image-side surface. The second lens 420 has negative refractive power and a convex shape on the object-side surface and a concave shape on the image-side surface. The third lens 430 has positive refractive power and a convex shape on both the object-side and image-side surfaces. The fourth lens 440 has negative refractive power and a concave shape on both the object-side and image-side surfaces. The fifth lens 450 has negative refractive power and a convex shape on both the object-side and image-side surfaces. Additionally, the fifth lens 450 has shapes that form inflection points on both the object-side and image-side surfaces. The sixth lens 460 has positive refractive power and a convex shape on the object-side surface and a concave shape on the image-side surface. Furthermore, the sixth lens 460 has a shape that forms inflection points on both the object-side and image-side surfaces. The seventh lens 470 has negative refractive power and has a concave shape on both the object-side and image-side surfaces. Additionally, the seventh lens 470 has a shape that forms inflection points on both the object-side and image-side surfaces.

[0130] The imaging lens system 400 also includes a filter 480 and an image sensor 490. The filter 480 is disposed between the seventh lens 470 and the image sensor 490. For reference, although not shown in the figures, an aperture stop may be disposed between the second lens 420 and the third lens 430.

[0131] Imaging lens system 400 shows, for example Figure 8 The aberration characteristics are shown in Tables 7 and 8. Tables 7 and 8 show the lens characteristics and aspherical surface values ​​of the imaging lens system 400.

[0132] Table 7

[0133]

[0134]

[0135] Table 8

[0136] Example 4 K A B C D E F G H J S1 -1.0394 0.0040 0.0069 -0.0084 0.0069 -0.0036 0.0012 -0.0003 3.23E-05 -1.74E-06 S2 21.6009 -0.0171 0.0046 0.0082 -0.0127 0.0089 -0.0037 0.0009 -0.0001 7.09E-06 S3 15.9987 -0.0525 0.0325 0.0037 -0.0232 0.0211 -0.0103 0.0030 -0.0005 3.06E-05 S4 1.0581 -0.0412 0.0340 -0.0111 0.0039 -0.0057 0.0059 -0.0029 0.0007 -0.0001 S5 0 -0.0210 -0.0180 0.0475 -0.0705 0.0651 -0.0374 0.0129 -0.0025 0.0002 S6 -76.4723 -0.0373 0.0235 -0.0503 0.0666 -0.0527 0.0260 -0.0079 0.0013 -0.0001 S7 0 -0.0410 0.0064 -0.0081 0.0068 -0.0022 -0.0003 0.0004 -0.0001 1.26E-05 S8 0 -0.0354 0.0130 -0.0145 0.0106 -0.0045 0.0011 -0.0001 -7.15E-06 1.59E-06 S9 0 -0.0625 0.0399 -0.0218 0.0081 -0.0022 0.0004 -0.0001 0.0000 -1.37E-07 S10 -99.0000 -0.0603 0.0241 -0.0076 0.0016 -0.0002 2.98E-05 -3.23E-06 2.10E-07 -5.68E-09 S11 -7.2394 0.0102 -0.0102 0.0021 -0.0004 0.0001 -5.72E-06 3.13E-07 -9.05E-09 1.08E-10 S12 -27.2182 0.0362 -0.0182 0.0039 -0.0006 0.0001 -4.38E-06 2.05E-07 -5.44E-09 6.16E-11 S13 -4.2405 -0.0338 0.0065 -0.0004 1.56E-06 1.38E-06 -8.01E-08 1.82E-09 -1.07E-11 -1.27E-13 S14 -54.8281 -0.0218 0.0032 -0.0003 1.25E-05 -3.05E-07 1.15E-08 -8.25E-10 2.96E-11 -3.74E-13

[0137] Reference Figure 9 The imaging lens system according to the fifth example is described.

[0138] 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, and a seventh lens 570.

[0139] The first lens 510 has positive refractive power and a convex shape on the object-side surface and a concave shape on the image-side surface. The second lens 520 has negative refractive power and a convex shape on the object-side surface and a concave shape on the image-side surface. The third lens 530 has positive refractive power and a convex shape on both the object-side and image-side surfaces. The fourth lens 540 has negative refractive power and a concave shape on both the object-side and image-side surfaces. The fifth lens 550 has negative refractive power and a convex shape on both the object-side and image-side surfaces. Additionally, the fifth lens 550 has shapes that form inflection points on both the object-side and image-side surfaces. The sixth lens 560 has positive refractive power and a convex shape on the object-side surface and a concave shape on the image-side surface. Furthermore, the sixth lens 560 has a shape that forms inflection points on both the object-side and image-side surfaces. The seventh lens 570 has negative refractive power and has a concave shape on both the object-side and image-side surfaces. Additionally, the seventh lens 570 has a shape that forms inflection points on both the object-side and image-side surfaces.

[0140] The imaging lens system 500 also includes a filter 580 and an image sensor 590. The filter 580 is disposed between the seventh lens 570 and the image sensor 590. For reference, although not shown in the figures, an aperture stop may be disposed between the second lens 520 and the third lens 530.

[0141] Imaging lens system 500 shows, for example Figure 10 The aberration characteristics are shown in Tables 9 and 10. Tables 9 and 10 show the lens characteristics and aspherical surface values ​​of the imaging lens system 500.

[0142] Table 9

[0143] Face number refer to radius of curvature Thickness / Distance Refractive index Abbe number S1 First lens 2.7185076 1.092 1.544 56.1 S2 12.76 0.175 S3 Second lens 8.66 0.230 1.671 19.3 S4 4.58 0.542 S5 Third lens 58.30 0.437 1.544 56.1 S6 -37.343513 0.233 S7 Fourth lens -39.38 0.455 1.639 23.5 S8 197.62 0.629 S9 Fifth lens 6.51 0.370 1.568 37.4 S10 4.86 0.417 S11 Sixth lens 2.50 0.544 1.544 56.1 S12 7.54 1.368 S13 Seventh Lens -4.08 0.420 1.544 56.1 S14 7.41 0.377 S15 Filter infinity 0.210 1.514 64.2 S16 infinity 0.347 Imaging surface Imaging surface infinity -0.015

[0144] Table 10

[0145] Example 5 K A B C D E F G H J S1 -1.0355 0.0008 0.0147 -0.0193 0.0161 -0.0085 0.0029 -0.0006 0.0001 -3.66E-06 S2 23.2430 -0.0191 0.0100 0.0009 -0.0062 0.0051 -0.0023 0.0006 -0.0001 4.77E-06 S3 16.0208 -0.0571 0.0446 -0.0141 -0.0065 0.0106 -0.0060 0.0018 -0.0003 2.02E-05 S4 0.9155 -0.0438 0.0385 -0.0132 -0.0020 0.0049 -0.0023 0.0005 -1.72E-05 -4.19E-06 S5 0 -0.0212 -0.0159 0.0393 -0.0520 0.0426 -0.0217 0.0067 -0.0011 0.0001 S6 -43.9004 -0.0442 0.0384 -0.0699 0.0811 -0.0581 0.0263 -0.0074 0.0012 -0.0001 S7 0 -0.0412 0.0034 0.0035 -0.0134 0.0170 -0.0110 0.0039 -0.0007 0.0001 S8 0 -0.0371 0.0171 -0.0170 0.0098 -0.0028 0.0001 0.0002 -4.53E-05 3.78E-06 S9 0 -0.0761 0.0558 -0.0344 0.0147 -0.0045 0.0009 -0.0001 9.80E-06 -3.30E-07 S10 -75.9915 -0.0668 0.0292 -0.0101 0.0023 -0.0004 0.0001 -4.85E-06 2.85E-07 -7.22E-09 S11 -8.2269 0.0131 -0.0136 0.0036 -0.0008 0.0001 -1.04E-05 5.57E-07 -1.59E-08 1.90E-10 S12 -38.3867 0.0373 -0.0206 0.0051 -0.0008 0.0001 -7.88E-06 3.83E-07 -1.03E-08 1.18E-10 S13 -3.1329 -0.0341 0.0063 -0.0004 -7.92E-07 1.14E-06 -4.71E-08 1.78E-10 2.87E-11 -5.13E-13 S14 -42.1372 -0.0248 0.0041 -0.0004 2.77E-05 -1.22E-06 3.46E-08 -6.33E-10 9.25E-12 -1.06E-13

[0146] Reference Figure 11 Describe the imaging lens system according to the sixth example.

[0147] 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, and a seventh lens 670.

[0148] The first lens 610 has positive refractive power and a convex shape on the object-side surface and a concave shape on the image-side surface. The second lens 620 has negative refractive power and a convex shape on the object-side surface and a concave shape on the image-side surface. The third lens 630 has positive refractive power and a convex shape on both the object-side and image-side surfaces. The fourth lens 640 has negative refractive power and a concave shape on the object-side surface and a convex shape on the image-side surface. The fifth lens 650 has positive refractive power and a convex shape on the object-side surface and a concave shape on the image-side surface. Additionally, the fifth lens 650 has shapes that form inflection points on both the object-side and image-side surfaces. The sixth lens 660 has positive refractive power and a convex shape on the object-side surface and a concave shape on the image-side surface. Furthermore, the sixth lens 660 has a shape that forms inflection points on both the object-side and image-side surfaces. The seventh lens 670 has negative refractive power and has a concave shape on both the object-side and image-side surfaces. Additionally, the seventh lens 670 has a shape that forms inflection points on both the object-side and image-side surfaces.

[0149] The imaging lens system 600 also includes a filter 680 and an image sensor 690. The filter 680 is disposed between the seventh lens 670 and the image sensor 690. For reference, although not shown in the figures, an aperture stop may be disposed between the second lens 620 and the third lens 630.

[0150] Imaging lens system 600 shows, for example Figure 12 The aberration characteristics are shown in Tables 11 and 12. Tables 11 and 12 show the lens characteristics and aspherical surface values ​​of the imaging lens system 600.

[0151] Table 11

[0152] Face number refer to radius of curvature Thickness / Distance Refractive index Abbe number S1 First lens 2.67 1.031 1.544 56.1 S2 9.43 0.200 S3 Second lens 6.95 0.230 1.680 18.4 S4 4.29 0.622 S5 Third lens 59.38986 0.437 1.544 56.1 S6 -50.84 0.264 S7 Fourth lens -23.50 0.326 1.680 18.4 S8 -61.66 0.571 S9 Fifth lens 6.42 0.359 1.568 37.4 S10 6.69 0.493 S11 Sixth lens 3.06 0.552 1.544 56.1 S12 9.80 1.430 S13 Seventh Lens -3.48 0.403 1.544 56.1 S14 10.26 0.181 S15 Filter infinity 0.210 1.514 64.2 S16 infinity 0.509 Imaging surface Imaging surface infinity 0.012

[0153] Table 12

[0154] Example 6 K A B C D E F G H J S1 -1.0111 0.0031 0.0115 -0.0176 0.0170 -0.0102 0.0038 -0.0009 0.0001 -6.32E-06 S2 14.6338 -0.0181 0.0087 -0.0053 0.0039 -0.0024 0.0010 -0.0002 3.43E-05 -2.02E-06 S3 13.0489 -0.0453 0.0301 -0.0165 0.0139 -0.0111 0.0059 -0.0019 0.0003 -2.53E-05 S4 2.0700 -0.0302 0.0190 0.0095 -0.0239 0.0234 -0.0137 0.0048 -0.0010 0.0001 S5 0 -0.0158 -0.0302 0.0716 -0.1026 0.0914 -0.0512 0.0176 -0.0034 0.0003 S6 94.2471 -0.0214 -0.0101 0.0093 -0.0072 0.0054 -0.0031 0.0011 -0.0002 1.63E-05 S7 0 -0.0167 -0.0437 0.0720 -0.0791 0.0568 -0.0259 0.0072 -0.0011 0.0001 S8 0 -0.0186 -0.0236 0.0334 -0.0305 0.0182 -0.0069 0.0016 -0.0002 1.17E-05 S9 0 -0.0396 0.0203 -0.0108 0.0041 -0.0011 0.0002 -2.52E-05 1.79E-06 -5.46E-08 S10 -55.6301 -0.0479 0.0210 -0.0082 0.0024 -0.0005 0.0001 -7.14E-06 3.78E-07 -8.43E-09 S11 -7.3401 0.0023 -0.0046 0.0004 1.39E-06 -2.88E-06 3.40E-07 -2.51E-08 1.01E-09 -1.63E-11 S12 -70.2827 0.0258 -0.0110 0.0019 -0.0002 1.02E-05 -2.06E-07 -1.08E-08 7.73E-10 -1.41E-11 S13 -5.4006 -0.0324 0.0065 -0.0006 0.0001 -6.11E-06 4.47E-07 -1.95E-08 4.53E-10 -4.35E-12 S14 -81.9062 -0.0174 0.0025 -0.0002 1.41E-05 -1.05E-06 7.83E-08 -3.60E-09 8.34E-11 -7.60E-13

[0155] Table 13 shows the characteristic values ​​of the imaging lens systems according to the first to sixth examples.

[0156] Table 13

[0157] refer to First Example Second example Third Example Fourth example Fifth example Sixth example f 5.4400 5.4400 5.5000 6.7900 6.7900 6.7700 f1 5.2118 5.2360 5.3400 6.1671 6.0930 6.4870 f2 -13.136 -13.269 -13.240 -14.973 -14.655 -16.875 f3 24.259 23.771 32.805 42.349 41.763 50.247 f4 -18.415 -18.540 -22.408 -56.614 -50.900 -55.460 f5 -264.430 -276.040 469.354 -72.648 -36.671 189.158 f6 3.9103 3.9450 4.0730 7.2520 6.5810 7.9250 f7 -3.0703 -3.0755 -3.1397 -4.8170 -4.7618 -4.7070 f12 7.4920 7.5199 7.7610 9.1670 4.8690 9.2468 TTL 6.6945 6.7000 6.7000 7.8300 7.8300 7.8298 BFL 1.0349 1.0360 0.9966 0.9175 0.9188 0.9120 FOV 80.0 80.0 80.0 82.0 82.0 82.0 IH 4.6500 4.6500 4.6500 6.0070 6.0070 6.0070 SD5 2.2950 2.2961 2.2430 3.0737 3.0639 2.9890 SD6 3.3180 3.3176 3.1810 4.2745 4.1594 4.2990 SD7 4.1960 4.2461 4.1426 5.0657 4.9940 5.1200

[0158] The imaging lens system described in the example typically has the following optical characteristics. For example, the total length (TTL) of the imaging lens system is in the range of 5.7 mm to 8.8 mm, the total focal length is in the range of 4.8 mm to 7.4 mm, the focal length of the first lens is in the range of 5.0 mm to 6.7 mm, the focal length of the second lens is in the range of -20 mm to -10 mm, the focal length of the third lens is in the range of 20 mm to 60 mm, the focal length of the fourth lens is less than -15 mm, the focal length of the fifth lens is greater than 100 mm or less than -30 mm, the focal length of the sixth lens is in the range of 3.0 mm to 9.0 mm, and the focal length of the seventh lens is in the range of -5.6 mm to -2.2 mm. Additionally, the field of view (FOV) of the imaging lens system is in the range of 78 degrees to 88 degrees.

[0159] Table 14 shows the conditional expression values ​​for the imaging lens systems according to the first to sixth examples.

[0160] Table 14

[0161]

[0162]

[0163] As illustrated above, the performance of compact cameras can be improved based on the examples.

[0164] While this disclosure includes specific examples, it will be apparent to those skilled in the art 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 should be understood in a descriptive sense only and not for limiting purposes. The description of features or aspects in each example should be considered applicable to similar features or aspects in other examples. Suitable results may still be achieved if the described techniques are performed in a different order, and / or if components in the described system, architecture, device, or circuit are combined in different ways and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of this disclosure is not limited by the specific embodiments but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in this disclosure.

Claims

1. An imaging lens system, comprising: The first lens has positive refractive power; The second lens has negative refractive power; The third lens has positive refractive power; The fourth lens has negative refractive power; The fifth lens has refractive power; The sixth lens has positive refractive power; as well as The seventh lens has negative refractive power. The first lens to the seventh lens are arranged sequentially from the object side toward the imaging plane. The imaging lens system has a total of seven lenses. Where TTL / 2IH < 0.730, TTL is the distance from the object side of the first lens to the imaging plane, and 2IH is the diagonal length of the imaging plane. The second lens has a focal length in the range of -20 mm to -10 mm. The third lens has a focal length in the range of 20 mm to 60 mm, and Wherein, -3.5 < f2 / f ≤ -2.1583, where f is the focal length of the imaging lens system and f2 is the focal length of the second lens.

2. The imaging lens system according to claim 1, wherein, 0 < f1 / f < 2.0, where f1 is the focal length of the first lens.

3. The imaging lens system according to claim 1, wherein, -25 < V1-V2 < 45, Wherein, V1 is the Abbe number of the first lens, and V2 is the Abbe number of the second lens.

4. The imaging lens system according to claim 1, wherein, -10 < V1-V3 < 10, Wherein, V1 is the Abbe number of the first lens, and V3 is the Abbe number of the third lens.

5. The imaging lens system according to claim 1, wherein, 25 < V1-V4 < 45, Wherein, V1 is the Abbe number of the first lens, and V4 is the Abbe number of the fourth lens.

6. The imaging lens system according to claim 1, wherein, 0 < V1-V5 < 20, Wherein, V1 is the Abbe number of the first lens, and V5 is the Abbe number of the fifth lens.

7. The imaging lens system according to claim 1, wherein, The F-number is 2.0 or less.

8. An imaging lens system, comprising: The first lens has positive refractive power; The second lens has negative refractive power; The third lens has positive refractive power; The fourth lens has negative refractive power; The fifth lens has refractive power; The sixth lens has positive refractive power; as well as The seventh lens has negative refractive power. The first lens to the seventh lens are arranged sequentially from the object side toward the imaging plane. The imaging lens system has a total of seven lenses. Where TTL / 2IH < 0.730, TTL is the distance from the object side of the first lens to the imaging plane, and 2IH is the diagonal length of the imaging plane. The imaging lens system has a focal length in the range of 4.8 mm to 7.8 mm, and Wherein, -3.5 < f2 / f ≤ -2.1583, where f is the focal length of the imaging lens system and f2 is the focal length of the second lens.

9. The imaging lens system according to claim 8, wherein, -1 < f1 / f2 < 0, where f1 is the focal length of the first lens.

10. The imaging lens system according to claim 8, wherein, 1.5 < f3 / f, where f3 is the focal length of the third lens.

11. The imaging lens system according to claim 8, wherein, 1 / f3 < 1 / f1, where f1 is the focal length of the first lens and f3 is the focal length of the third lens.

12. The imaging lens system according to claim 8, wherein, 1 / f3 < 1 / f6, where f3 is the focal length of the third lens and f6 is the focal length of the sixth lens.

Images