Imaging lens system

Abstract

An imaging lens system includes, in order from an object side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. In the imaging lens system, TTL / 2ImgHT is less than 0.640, where TTL is an axial distance between an object side surface of the first lens and an imaging plane, and 2ImgHT is a diagonal length of the imaging plane.

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2020-0103262, filed on August 18, 2020, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. Technical Field

[0003] This disclosure relates to an imaging lens system comprising seven lenses. Background Technology

[0004] Small cameras can be mounted in wireless terminal devices. For example, a small camera can be mounted on both the front and rear surfaces of the wireless terminal device. Since small cameras are used for various purposes such as outdoor scene photography and indoor portrait photography, they need to have a performance level comparable to that of ordinary cameras. However, achieving high performance for small cameras can be difficult because the mounting space may be limited by the size of the wireless terminal device. Therefore, there is a need to develop an imaging lens system that can improve the performance of a small camera without increasing its size.

[0005] The above information is presented as background information only to aid in understanding this disclosure. No determination or assertion is made as to whether any of the above content can be used as prior art with respect to this disclosure. Summary of the Invention

[0006] The summary portion of this invention is intended to provide a brief overview of the chosen inventive concepts, which will be further described in the detailed description portion below. This summary portion is not intended to identify key or essential features of the claimed subject matter, nor to help determine the scope of the claimed subject matter.

[0007] One aspect of this disclosure is to provide an imaging lens system capable of achieving high resolution.

[0008] In one 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 arranged sequentially from the object side. The ratio of the axial distance TTL between the object side of the first lens and the imaging plane to the diagonal length 2ImgHT of the imaging plane (TTL / 2ImgHT) is less than 0.640.

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

[0010] The object-side surface of the sixth lens may include a first protrusion, a first recess, and a second protrusion formed around the optical axis.

[0011] The imaging lens system can satisfy SagS11tp greater than 0.10 mm, where SagS11tp is the distance in the optical axis direction from the optical axis center of the object-side surface of the sixth lens to the point on the object-side surface of the sixth lens that is closest to the imaging surface.

[0012] The imaging lens system can satisfy 0.43<S11tp / S11ER<0.51, where S11tp is the shortest distance from the optical axis to the point on the object-side surface of the sixth lens that is closest to the imaging surface, and S11ER is the effective radius of the object-side surface of the sixth lens.

[0013] The fourth lens may have negative refractive power.

[0014] The third lens may have a convex image-side surface.

[0015] The imaging lens system can satisfy S1ER / S14ER less than 0.390, where S1ER is the effective radius of the object-side surface of the first lens, and S14ER is the effective radius of the image-side surface of the seventh lens.

[0016] The imaging lens system can satisfy S10ER / S14ER less than 0.510, where S10ER is the effective radius of the image-side surface of the fifth lens, and S14ER is the effective radius of the image-side surface of the seventh lens.

[0017] The imaging lens system can satisfy 0.8<f3 / f5<1.2, where f3 is the focal length of the third lens, and f5 is the focal length of the fifth lens.

[0018] The fifth lens may have a convex object-side surface.

[0019] In another general aspect, an imaging lens system includes a first lens having positive refractive power; a second lens having refractive power; a third lens including a convex object-side surface; a fourth lens including a concave object-side surface and a concave image-side surface; a fifth lens having positive refractive power; a sixth lens having refractive power; and a seventh lens including a convex object-side surface. The first lens to the seventh lens are sequentially disposed from the object side, and f / ImgHT<1.12, where f is the focal length of the imaging lens system, and ImgHT is the maximum effective image height of the imaging lens system and is equal to half of the diagonal length of the effective imaging area of the imaging surface of the imaging plane.

[0020] The imaging lens system can satisfy SagS11mx less than -0.4 mm, where SagS11mx is the distance in the optical axis direction from the optical axis center of the object-side surface of the sixth lens to the end of the effective radius of the object-side surface of the sixth lens.

[0021] The imaging lens system can satisfy |SagS11tp / SagS11mx| less than 0.3, where SagS11tp is the optical axis distance from the center of the optical axis on the object side of the sixth lens to the point on the object side of the sixth lens closest to the imaging plane.

[0022] The fifth lens may have a convex object side or a convex image side.

[0023] Other features and aspects will become apparent from the following detailed description, the accompanying drawings, and the appended claims. Attached Figure Description

[0024] Figure 1 This is a diagram illustrating an imaging lens system according to the first example.

[0025] Figure 2 It is shown Figure 1 The diagram shows the aberration curves of the imaging lens system.

[0026] Figure 3 This is a diagram illustrating an imaging lens system according to the second example.

[0027] Figure 4 It is shown Figure 3 The diagram shows the aberration curves of the imaging lens system.

[0028] Figure 5 This is a diagram illustrating an imaging lens system according to the third example.

[0029] Figure 6 It is shown Figure 5 The diagram shows the aberration curves of the imaging lens system.

[0030] Figure 7 It is a partial magnified view of the sixth lens based on the first to third examples.

[0031] Figure 8 This is a diagram showing an imaging lens system according to the first to third examples, disposed in the lens barrel.

[0032] 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

[0033] 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 readily 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 herein, except for operations that must occur in a specific order, and may be varied, as will be readily apparent to those skilled in the art. Furthermore, for clarity and conciseness, descriptions of functions and structures that are well-known to those skilled in the art may be omitted.

[0034] The features described in this application may be implemented in different forms and should not be construed as being limited to the examples described in this application. Rather, the examples described in this application have been 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.

[0035] 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.

[0036] 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 are no other elements between the element and the other element.

[0037] 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.

[0038] 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.

[0039] 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 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 spatial relative terms used in this application should be interpreted accordingly.

[0040] 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 the plural form 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.

[0041] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described in this application are not limited to the specific shapes shown in the accompanying drawings, but include shape variations that may occur during manufacturing.

[0042] 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.

[0043] For purposes of clarity, illustration and convenience, the accompanying drawings may not be drawn to scale, and the relative dimensions, scale and depiction of elements in the drawings may be exaggerated.

[0044] In the example, the first lens refers to the lens closest to the object (or subject), while the seventh lens refers to the lens closest to the imaging plane (or image sensor). In the example, the units for radius of curvature, thickness, TTL, ImgHT (half the diagonal length of the imaging plane), and focal length are millimeters (mm). The lens thickness, the gap between lenses, and TTL refer to the distance between lenses along the optical axis. Furthermore, in the description of the lens shape, a convex configuration indicates that the optical axis region of that surface is convex, and a concave configuration indicates that the optical axis region of that surface is concave. Therefore, even when describing a lens as having a convex surface, the edge of the lens can be concave. Similarly, even when describing a lens as having a concave surface, the edge of the lens can be convex.

[0045] An imaging lens system may include seven lenses. For example, an 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 to seventh lenses may be arranged at predetermined intervals. For example, each lens may not contact the image-side or object-side of the adjacent lens in the paraxial portion.

[0046] The imaging lens system can be configured to be mounted in a thin, portable terminal device. For example, the ratio (TTL / 2ImgHT) of the axial distance TTL between the object-side surface and the imaging surface of the first lens to the diagonal length 2ImgHT of the imaging surface can be less than 0.64. For example, because the imaging lens system, according to various examples, has a significantly smaller height compared to the size of the imaging surface (or image sensor), the imaging lens system can be mounted in an ultra-thin portable terminal and can perform high-resolution image capture and photography.

[0047] The following description will describe the lenses and other components that make up the imaging lens system.

[0048] The first lens may have refractive power. For example, the first lens may have positive refractive power. One surface of the first lens may be convex. For example, the first lens may have a convex object-side surface. The first lens may have 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 processability. For example, the first lens may be made of a plastic material. The first lens may have a low refractive index. For example, the refractive index of the first lens may be less than 1.6.

[0049] The second lens may have refractive power. The second lens may have an aspherical surface. For example, both surfaces of the second lens may be aspherical. The second lens may be manufactured using a material with high light transmittance and excellent processability. For example, the second lens may be made of plastic. The second lens may have a higher refractive index than the first lens. For example, the refractive index of the second lens may be 1.6 or greater. As another example, the refractive index of the second lens may be 1.67 or higher.

[0050] The third lens may have refractive power. At least one surface of the third lens may be convex. For example, the third lens may have a convex object-side surface. The third lens may have an aspherical surface. For example, two surfaces of the third lens may be aspherical. The third lens may be manufactured using a material with high light transmittance and excellent processability. For example, the third lens may be manufactured using a plastic material. The third lens may have 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.

[0051] The fourth lens may have refractive power. For example, the fourth lens may have negative refractive power. One surface of the fourth lens may be concave. For example, the fourth lens may have a concave object-side surface. The fourth lens may have an aspherical surface. For example, both surfaces of the fourth lens may be aspherical. The fourth lens may be manufactured using materials with high light transmittance and excellent processability. For example, the fourth lens may be manufactured using plastic materials. The fourth lens may have a higher refractive index than the first lens. For example, the refractive index of the fourth lens may be 1.6 or greater. As another example, the refractive index of the fourth lens may be 1.67 or greater.

[0052] The fifth lens may have refractive power. For example, the fifth lens may have positive refractive power. One surface of the fifth lens may be convex. For example, the fifth lens may have a convex object-side surface or a convex image-side surface. The shape of the object-side surface of the fifth lens may be related to the image-side surface of the third lens. For example, when the object-side surface of the fifth lens is convex, the image-side surface of the third lens may be concave. When the object-side surface of the fifth lens is concave, the image-side surface of the third lens may be convex. The fifth lens may have an aspherical surface. For example, both surfaces of the fifth lens may be aspherical. The fifth lens may be manufactured using materials with high light transmittance and excellent machinability. For example, the fifth lens may be manufactured using plastic materials. For example, the refractive index of the fifth lens may be 1.6 or greater.

[0053] The sixth lens may have refractive power. One surface of the sixth lens may be convex. For example, the sixth lens may have a convex object-side surface. The sixth lens may have a shape with a curvature point. For example, a curvature point may be formed on at least one of the object-side and image-side surfaces of the sixth lens. A first protrusion, a first recess, and a second protrusion may be sequentially formed around the optical axis on the object-side surface of the sixth lens. To provide further description, the first protrusion may be formed in the optical axis portion or paraxial portion of the object-side surface of the sixth lens, the second protrusion may be formed in the edge portion of the object-side surface of the sixth lens, and the first recess may be formed between the first and second protrusions. Furthermore, the first recess may have a point closest to the image plane from the object-side surface of the sixth lens. The sixth lens may have an aspherical surface. For example, both surfaces of the sixth lens may be aspherical. The sixth lens may be manufactured using a material with high light transmittance and excellent processability. For example, the sixth lens may be manufactured using a plastic material. The sixth lens may have a lower refractive index than other lenses. For example, the refractive index of the sixth lens may be less than 1.54.

[0054] The seventh lens may have refractive power. At least one surface of the seventh lens may be convex. For example, the seventh lens may have a convex object-side surface. The seventh lens may have a shape with inflection points. For example, one or more inflection points may be formed on at least one of the object-side surface and the imaging surface of the seventh lens. The seventh lens may have an aspherical surface. For example, two surfaces of the seventh lens may be aspherical. The seventh lens may be manufactured using a material with high light transmittance and excellent processability. For example, the seventh lens may be manufactured using a plastic material. The seventh lens may have a refractive index substantially similar to that of the first lens. For example, the refractive index of the seventh lens may be less than 1.6.

[0055] As described above, each of the first through seventh lenses has an aspherical surface. The aspherical surface of each of the first through seventh lenses can be represented by the following Equation 1:

[0056] (Equation 1)

[0057]

[0058] In Equation 1, "c" is the reciprocal of the radius of curvature of the corresponding lens, "k" is the conic constant, "r" is the distance from a point on the aspherical surface of the lens to the optical axis, "A to J" are aspherical constants, and "Z" (or SAG) is the height from a point on the aspherical surface to the vertex of the aspherical surface in the direction of the optical axis.

[0059] Imaging lens systems may also include filters, image sensors, and apertures.

[0060] A filter can be positioned between the seventh lens and the image sensor. The filter blocks light of a specific wavelength; for example, it blocks infrared light. The image sensor forms an imaging surface on which light refracted through the first to seventh lenses can be reflected. The image sensor converts optical signals into electrical signals. For example, it can convert optical signals incident on the imaging surface into electrical signals. An aperture can be configured to adjust the intensity of light incident on the lenses. For example, the aperture can be positioned between the second and third lenses.

[0061] An imaging lens system can satisfy one or more of the following conditional expressions.

[0062] 0.10mm <SagS11tp

[0063] 0.43 <S11tp / S11ER<0.51

[0064] S1ER / S14ER<0.39

[0065] 0.43 <S10ER / S14ER<0.51

[0066] f / ImgHT < 1.12

[0067] SagS11mx<-0.40mm

[0068] |SagS11tp / SagS11mx|<0.30

[0069] 0.8 <f3 / f5<1.2

[0070] 0.84mm≤FBL

[0071] f-number < 2.10

[0072] In the above conditional expressions, SagS11tp is the optical axis distance from the center of the optical axis on the object side of the sixth lens to the point on the object side of the sixth lens closest to the imaging plane; S11tp is the shortest distance from the object side of the sixth lens to the point on the object side of the sixth lens closest to the imaging plane; S11ER is the effective radius of the object side of the sixth lens; S1ER is the effective radius of the object side of the first lens; S14ER is the effective radius of the image side of the seventh lens; S10ER is the effective radius of the image side of the fifth lens; f is the focal length of the imaging lens system; ImgHT is the maximum effective image height of the imaging lens system and is equal to half the diagonal length of the effective imaging area of ​​the imaging surface of the image sensor; SagS11mx is the distance along the optical axis from the center of the optical axis on the object side of the sixth lens to the end of the effective radius of the object side of the sixth lens; f3 is the focal length of the third lens; f5 is the focal length of the fifth lens; and FBL is the distance from the end of the lens barrel (the part closest to the imaging plane) housing the first to the seventh lenses to the imaging plane.

[0073] For reference, in the values ​​of SagS11tp and SagS11mx, a positive sign indicates that the corresponding point is arranged closer to the imaging plane than the center of the optical axis on the object side of the sixth lens, while a negative sign indicates that the corresponding point is arranged closer to the object side of the sixth lens than the center of the optical axis on the object side of the sixth lens.

[0074] In the following description, various examples of imaging lens systems will be described.

[0075] In the following text, reference will be made to Figure 1 The imaging lens system 100 according to the first example is described.

[0076] The imaging lens system 100 may include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, and a seventh lens 170.

[0077] The first lens 110 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The second lens 120 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. The third lens 130 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The fourth lens 140 can have negative refractive power and can have a concave object-side surface and a concave image-side surface. The fifth lens 150 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The sixth lens 160 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. Furthermore, the sixth lens 160 can have a shape that forms inflection points on both the object-side and image-side surfaces. Two inflection points can be formed on the object-side surface of the sixth lens 160. The seventh lens 170 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. Furthermore, the seventh lens 170 can have a shape that forms inflection points on both the object-side and image-side surfaces.

[0078] The imaging lens system 100 may further include a filter IF and an image sensor IP. The filter IF may be disposed between the seventh lens 170 and the image sensor IP. For reference, although not shown in the figures, an aperture stop may be disposed between the second lens 120 and the third lens 130.

[0079] The imaging lens system 100 configured as described above presents as follows: Figure 2 The aberration characteristics are shown. The lens characteristics and aspherical values ​​of the imaging lens system 100 according to the first example are listed in Tables 1 and 2.

[0080] Table 1

[0081]

[0082] Table 2

[0083]

[0084]

[0085] In the following text, reference will be made to Figure 3 The imaging lens system 200 according to the second example is described.

[0086] The imaging lens system 200 may include a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, a sixth lens 260, and a seventh lens 270.

[0087] The first lens 210 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The second lens 220 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. The third lens 230 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The fourth lens 240 can have negative refractive power and can have a concave object-side surface and a concave image-side surface. The fifth lens 250 can have positive refractive power and can have a concave object-side surface and a convex image-side surface. The sixth lens 260 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. Furthermore, the sixth lens 260 can have a shape that forms inflection points on both the object-side and image-side surfaces. Two inflection points can be formed on the object-side surface of the sixth lens 260. The seventh lens 270 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. Furthermore, the seventh lens 270 can have a shape that forms inflection points on both the object-side and image-side surfaces.

[0088] The imaging lens system 200 may also include a filter IF and an image sensor IP. The filter IF may be positioned between the seventh lens 270 and the image sensor IP. For reference, although not shown in the figures, an aperture stop may be positioned between the second lens 220 and the third lens 230.

[0089] The imaging lens system 200 configured as described above presents as follows: Figure 4 The aberration characteristics are shown. The lens characteristics and aspherical values ​​of the imaging lens system 200 according to the second example are listed in Tables 3 and 4.

[0090] Table 3

[0091]

[0092] Table 4

[0093]

[0094]

[0095] In the following text, reference will be made to Figure 5 The imaging lens system 300 is described according to the third example.

[0096] The imaging lens system 300 may include a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, a sixth lens 360, and a seventh lens 370.

[0097] The first lens 310 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The second lens 320 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. The third lens 330 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The fourth lens 340 can have negative refractive power and can have a concave object-side surface and a concave image-side surface. The fifth lens 350 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. The sixth lens 360 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. Furthermore, the sixth lens 360 can have a shape that forms inflection points on both the object-side and image-side surfaces. Two inflection points can be formed on the object-side surface of the sixth lens 360. The seventh lens 370 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. Furthermore, the seventh lens 370 can have a shape that forms inflection points on both the object-side and image-side surfaces.

[0098] The imaging lens system 300 may also include a filter IF and an image sensor IP. The filter IF may be disposed between the seventh lens 370 and the image sensor IP. For reference, although not shown in the figures, an aperture stop may be disposed between the second lens 320 and the third lens 330.

[0099] The imaging lens system 300 configured as described above presents as follows: Figure 6 The aberration characteristics are shown. The lens characteristics and aspherical values ​​of the imaging lens system 300 according to the second example are listed in Tables 5 and 6.

[0100] Table 5

[0101]

[0102] Table 6

[0103]

[0104]

[0105] The characteristic values ​​of the imaging lens systems based on the first to third examples are listed in Table 7.

[0106] Table 7

[0107] f 5.000000 5.100 5.000 f1 4.2453 4.3105 4.4154 f2 -11.7543 -12.2030 -11.9378 f3 27.7478 26.3253 19.6428 f4 -17.8115 -13.5381 -13.6451 f5 33.6582 24.4436 24.3345 f6 9.0859 8.9480 8.7656 f7 -4.6792 -4.6974 -4.3677 FOV 83.23 83.00 83.20 TTL 5.640 5.824 5.650 f number 1.880 2.060 1.910 2ImgHT 9.072 9.240 9.480

[0108] Furthermore, the imaging lens system according to this disclosure can generally have the following optical characteristics. For example, the total track length (TTL) of the imaging lens system can be determined to be in the range of 5.3 mm to 6.0 mm, the total focal length of the imaging lens system can be determined to be in the range of 4.8 mm to 6.1 mm, the focal length of the first lens can be determined to be in the range of 3.8 mm to 4.8 mm, the focal length of the second lens can be determined to be in the range of -16 mm to -10.0 mm, the focal length of the third lens can be determined to be in the range of 18 mm to 30.0 mm, the focal length of the fourth lens can be determined to be in the range of -20.0 mm to -11 mm, the focal length of the fifth lens can be determined to be in the range of 22 mm to 36 mm, the focal length of the sixth lens can be determined to be in the range of 7.8 mm to 9.8 mm, and the focal length of the seventh lens can be determined to be in the range of -5.6 mm to -3.8 mm. In addition, the field of view (FOV) of the imaging lens system can be determined to be in the range of 80.0 degrees to 86 degrees.

[0109] The conditional expression values ​​for the imaging lens systems of the first to third examples are listed in Table 8.

[0110] Table 8

[0111] TTL / 2ImgHT 0.6218 0.6303 0.5961 SagS11tp 0.1100 0.1320 0.1320 S11tp / S11ER 0.4711 0.4488 0.4970 S1ER / S14ER 0.3739 0.3358 0.3757 S10ER / S14ER 0.4995 0.4832 0.4980 f / ImgHT 1.1023 1.1039 1.0549 SagS11mx -0.5200 -0.4540 -0.5330 |SagS11tp / SagS11mx| 0.2115 0.2907 0.2477 f3 / f5 0.8244 1.0770 0.8072 FBL 0.8400 0.8500 0.8500

[0112] In the following text, reference will be made to Figure 7 Describe the detailed shape of the sixth lens.

[0113] The sixth lens according to various embodiments (e.g., sixth lens 160, sixth lens 260, and sixth lens 360) may have a convex shape and a concave shape on one of its surfaces. For example, both the convex shape and the concave shape may be formed on the object-side surface of the sixth lens. The first protrusion S11V1, the first concave portion S11C1, and the second protrusion S11V2 may be formed sequentially along the radius of the sixth lens from the optical axis on the object-side surface of the sixth lens. For example, the first protrusion S11V1 may be formed in the paraxial portion of the sixth lens, the second protrusion S11V2 may be formed in the edge portion of the sixth lens, and the first concave portion S11C1 may be formed between the first protrusion S11V1 and the second protrusion S11V2.

[0114] In the first recess S11C1, a point closest to the imaging plane can be formed on the object-side surface of the sixth lens. The optical axis distance SagS11tp from the center of the optical axis on the object-side surface of the sixth lens to the point closest to the imaging plane on the object-side surface of the sixth lens can be greater than 0.10 mm.

[0115] The second protrusion S11V2 can be formed to protrude more than the first protrusion S11V1. For example, the second protrusion S11V2 can be formed to protrude more than the first protrusion S11V1 toward the object side. The optical axis distance SagS11mx from the center of the optical axis of the object side of the sixth lens 160 to the end of the second protrusion S11V2 (e.g., the end of the effective radius of the object side of the sixth lens) can be less than -0.4 mm.

[0116] The features of a lens barrel configured to house an imaging lens system according to various embodiments will be described below.

[0117] Lens barrels B are provided to accommodate imaging lens systems 100, 200, and 300 according to the first to third examples. Lens barrel B can be positioned significantly close to the imaging surface or image sensor IP. For example, the distance FBL from the end of lens barrel B to image sensor IP can be greater than 0.84 mm to less than 1.2 mm. Lens barrel B can be formed with significant dimensions. For example, the outermost radius BRmx of lens barrel B can be less than 4.82 mm.

[0118] As mentioned above, this can improve the performance of small cameras.

[0119] While specific examples have been shown and described above, it will be apparent upon understanding this disclosure that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein should be understood in a descriptive sense only and not for limiting purposes. The description of features or aspects in each example should be understood as applicable to similar features or aspects in other examples. Appropriate results may still be achieved if the described techniques are performed in a different order, and / or if components in the described system, architecture, device, or circuit are combined in a different manner 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: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence from an object side, wherein 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 positive refractive power, the sixth lens has positive refractive power and comprises a concave image-side surface, and the seventh lens has negative refractive power, wherein the imaging lens system comprises a total of 7 lenses with refractive power, wherein at least one of the first lens to the seventh lens has an aspheric surface, wherein S1ER / S14ER is less than 0.390, where S1ER is the effective radius of the object-side surface of the first lens, and S14ER is the effective radius of the image-side surface of the seventh lens, wherein TTL / 2ImgHT is less than 0.640, where TTL is the axial distance between the object-side surface of the first lens and an imaging plane, and 2ImgHT is the diagonal length of the imaging plane, and wherein SagS11tp is greater than 0.10 mm, where SagS11tp is the distance in the optical axis direction from the optical axis center of the object-side surface of the sixth lens to the point closest to the imaging plane on the object-side surface of the sixth lens.

2. The imaging lens system according to claim 1, wherein, The sixth lens comprises a convex object-side surface.

3. The imaging lens system according to claim 1, wherein, The object-side surface of the sixth lens comprises a first convex portion, a first concave portion and a second convex portion formed around the optical axis.

4. The imaging lens system according to claim 1, wherein, 0.43 < S11tp / S11ER < 0.51, where S11tp is the shortest distance from the optical axis to the point closest to the imaging plane on the object-side surface of the sixth lens, and S11ER is the effective radius of the object-side surface of the sixth lens.

5. The imaging lens system according to claim 1, wherein, The third lens comprises a convex image-side surface.

6. The imaging lens system according to claim 1, wherein, S10ER / S14ER is less than 0.510, where S10ER is the effective radius of the image-side surface of the fifth lens.

7. The imaging lens system according to claim 1, wherein, The fifth lens comprises a convex object-side surface.

8. An imaging lens system, comprising: a first lens, having positive refractive power; a second lens, having negative refractive power; a third lens, having positive refractive power and comprising a convex object-side surface; a fourth lens, having negative refractive power, and comprising a concave object-side surface and a concave image-side surface; a fifth lens, having positive refractive power; a sixth lens, having positive refractive power, and comprising a concave image-side surface; and a seventh lens, having negative refractive power and comprising a convex object-side surface, wherein the imaging lens system comprises a total of 7 lenses with refractive power, wherein the first lens to the seventh lens are arranged in sequence from the object side, and at least one of the first lens to the seventh lens has an aspheric surface, wherein S1ER / S14ER is less than 0.390, where S1ER is the effective radius of the object-side surface of the first lens, and S14ER is the effective radius of the image-side surface of the seventh lens, Where f / ImgHT < 1.12, f is the focal length of the imaging lens system, and ImgHT is the maximum effective image height of the imaging lens system, which is equal to half the diagonal length of the effective imaging area of ​​the imaging surface. Wherein, SagS11tp is greater than 0.10 mm, and SagS11tp is the optical axis distance from the center of the optical axis on the object side of the sixth lens to the point on the object side of the sixth lens closest to the imaging surface.

9. The imaging lens system according to claim 8, wherein, SagS11mx is less than -0.4mm, where SagS11mx is the optical axis distance from the center of the optical axis on the object side of the sixth lens to the end of the effective radius of the object side of the sixth lens.

10. The imaging lens system according to claim 9, wherein, |SagS11tp / SagS11mx| is less than 0.

3.

11. The imaging lens system according to claim 8, wherein, The sixth lens includes a convex object-side surface.

12. The imaging lens system according to claim 8, wherein, The fifth lens includes a convex object-side surface or a convex image-side surface.

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