Imaging lens system and camera module

Abstract

An imaging lens system is provided. The imaging lens system includes a first lens having a refractive power, a second lens having a positive refractive power and having a concave image side surface, a third lens having a refractive power, a fourth lens having a positive refractive power and having a concave image side surface, a fifth lens having a concave object side surface, a sixth lens having a concave image side surface, a seventh lens having a convex object side surface, and an eighth lens having a refractive power, wherein the first lens to the eighth lens are sequentially arranged from an object side to an imaging side, and the imaging lens system satisfies the following conditional expression: 0.15 < BFL / TTL, where BFL is a distance from an image side surface of the eighth lens to an imaging plane, and TTL is a distance from an object side surface of the first lens to the imaging plane. A camera module is also provided.

Description

[0001] Cross - reference to related applications

[0002] This application claims the benefit of priority of Korean Patent Application No. 10 - 2021 - 0167233, filed on November 29, 2021, and Korean Patent Application No. 10 - 2022 - 0038069, filed on March 28, 2022, with the Korean Intellectual Property Office, the entire disclosures of which are incorporated herein by reference for all purposes. Technical field

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

[0004] A portable electronic device may include a camera module or device that captures images or videos. In an example, by way of non - limiting example, the camera module or device may be installed in a mobile phone, a laptop computer, a gaming console.

[0005] The resolution of the camera module and the resolution of the imaging lens system may be proportional to the size of the sensor and the size of the imaging surface. In an example, in order to implement a camera module and an imaging lens system with high resolution, a sensor and an imaging surface of a relatively large size may be required. However, since the size (or length) of the camera module and the imaging lens system may increase proportionally to the size of the sensor and the size of the imaging surface, it may be difficult to install such a camera module and an imaging lens system with high resolution in a thin electronic device such as a smartphone or the like. Summary of the invention

[0006] The Summary of the Invention section is provided to introduce, in a brief form, selections of inventive concepts, which will be further described in the Detailed Description section below. The Summary of the Invention section is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter.

[0007] In general, an imaging lens system includes a first lens having a refractive power; a second lens having a positive refractive power and having a concave image - side surface; a third lens having a refractive power; a fourth lens having a positive refractive power and having a concave image - side surface; a fifth lens having a concave object - side surface; a sixth lens having a concave image - side surface; a seventh lens having a convex object - side surface; and an eighth lens having a refractive power, wherein the first lens to the eighth lens are arranged in order from the object side to the imaging side, and the imaging lens system satisfies the following conditional expression: 0.15 < BFL / TTL, where BFL is the distance from the image - side surface of the eighth lens to the imaging surface, and TTL is the distance from the object - side surface of the first lens to the imaging surface.

[0008] The first lens may have a convex object side surface.

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

[0010] The eighth lens may have a convex object side surface.

[0011] The imaging lens system may satisfy the following conditional expression: 0 < f1 / f < 8.0, where f is the focal length of the imaging lens system, and f1 is the focal length of the first lens.

[0012] The imaging lens system may satisfy the following conditional expression: 0 < f2 / f < 3.0, where f is the focal length of the imaging lens system, and f2 is the focal length of the second lens.

[0013] The imaging lens system may satisfy the following conditional expression: TTL / f < 1.5, where f is the focal length of the imaging lens system.

[0014] The imaging lens system may satisfy the following conditional expression: BFL / f < 0.4, where f is the focal length of the imaging lens system.

[0015] The imaging lens system may satisfy the following conditional expression: TTL / 2IMGHT < 0.8, where 2IMGHT is the diagonal length of the imaging surface.

[0016] In general, the imaging lens system includes: a first lens with a positive refractive power; a second lens with a positive refractive power; a third lens with a refractive power; a fourth lens with a refractive power; a fifth lens with a concave object side surface; a sixth lens with a refractive power; a seventh lens with a positive refractive power; and an eighth lens with a refractive power, where the first lens to the eighth lens are arranged in order from the object side to the imaging side, and the imaging lens system satisfies the following conditional expression: 0.2 < BFL / TTL < 0.35, where BFL is the distance from the image side surface of the eighth lens to the imaging surface, and TTL is the distance from the object side surface of the first lens to the imaging surface.

[0017] The third lens may have a negative refractive power.

[0018] The eighth lens may have a negative refractive power.

[0019] The imaging lens system may satisfy the following conditional expression: 0.02 < BFL / f1 < 0.16, where f1 is the focal length of the first lens.

[0020] The imaging lens system may satisfy the following conditional expression: 0.2 < BFL / f2 < 0.4, where f2 is the focal length of the second lens.

[0021] The imaging lens system can satisfy the following conditional expression: -0.3 < BFL / f3 < -0.1, where f3 is the focal length of the third lens.

[0022] The imaging lens system can satisfy the following conditional expression: 0.06 < T1 / IMGHT < 0.10, where T1 is the thickness of the first lens and IMGHT is the height of the imaging surface.

[0023] According to the appended claims, the drawings, and the following detailed description, other features and aspects will become apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A configuration diagram showing an exemplary imaging lens system according to a first embodiment.

[0025] Figure 2 Shows Figure 1 The aberration curves of the exemplary imaging lens system shown.

[0026] Figure 3 A configuration diagram showing an exemplary imaging lens system according to a second embodiment.

[0027] Figure 4 Shows Figure 3 The aberration curves of the exemplary imaging lens system shown.

[0028] Figure 5 A configuration diagram showing an exemplary imaging lens system according to a third embodiment.

[0029] Figure 6 Shows Figure 5 The aberration curves of the exemplary imaging lens system shown.

[0030] Figure 7 A configuration diagram showing an exemplary imaging lens system according to a fourth embodiment.

[0031] Figure 8 Shows Figure 7 The aberration curves of the exemplary imaging lens system shown.

[0032] Figure 9 A configuration diagram showing an exemplary imaging lens system according to a fifth embodiment.

[0033] Figure 10 Shows Figure 9 The aberration curves of the exemplary imaging lens system shown.

[0034] Figure 11 A configuration diagram showing an exemplary imaging lens system according to a sixth embodiment.

[0035] Figure 12 It shows Figure 11 Aberration curves of an exemplary imaging lens system are shown.

[0036] Figure 13 A configuration diagram of an exemplary imaging lens system according to a seventh embodiment is shown.

[0037] Figure 14 It shows Figure 13 Aberration curves of an exemplary imaging lens system are shown.

[0038] Figure 15 A perspective view of an exemplary portable terminal with a camera module mounted thereon, according to one or more embodiments, is shown.

[0039] Figure 16 It shows Figure 15 A cross-sectional view of an exemplary portable terminal taken along line II.

[0040] Figure 17 It shows Figure 15 A cross-sectional view of an exemplary portable terminal taken along line II.

[0041] Figure 18 An enlarged view of an exemplary imaging lens system according to one or more embodiments is shown.

[0042] Figure 19 An enlarged view of an exemplary imaging lens system according to one or more embodiments is shown.

[0043] Throughout the accompanying drawings and detailed embodiments, the same reference numerals may refer to the same or similar 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

[0044] The following specific embodiments are provided to help readers gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein, except for operations that must occur in a specific order, but can be varied, as will become apparent upon understanding the disclosure of this application. Furthermore, for clarity and conciseness, descriptions of features known upon understanding the disclosure of this application may be omitted; however, it is worth noting that the omission of features and their descriptions is not intended to acknowledge them as conventional knowledge.

[0045] The features described herein 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 merely to illustrate some of the many possible ways in which the methods, apparatuses, and / or systems described herein will become apparent upon understanding the disclosure of this application.

[0046] The terminology used herein is for the purpose of describing particular examples only and is not intended to limit this disclosure. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more items. As used herein, the terms “comprising,” “including,” and “having” indicate the presence of the stated features, numbers, operations, elements, components, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, numbers, operations, elements, components, and / or combinations thereof. In this document, the use of the term “may” relative to an example or implementation, such as with regard to what an example or implementation may include or implement, means that there exists at least one example or implementation that includes or implements such a feature, and that all examples or implementations are not limited thereto.

[0047] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited by these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or section from another. Therefore, without departing from the teachings of the examples described herein, the first component, first part, first region, first layer, or first section mentioned in these examples may also be referred to as a second component, second part, second region, second layer, or second section.

[0048] 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. Similarly, expressions such as "between" and "directly between," and "adjacent to" and "directly adjacent to" can also be interpreted as described above.

[0049] Unless otherwise specified, all terms used in this application (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Terms such as those defined in common dictionaries shall be interpreted as having the same meaning as they have in the context of the relevant art and in this disclosure, and shall not be interpreted in an idealized or overly formal sense unless expressly so defined in this application.

[0050] In the example, the imaging lens system can be mounted in a portable electronic device.

[0051] In one or more examples, the first lens refers to the lens closest to the object (or subject), and the eighth lens refers to the lens closest to the imaging plane (or image sensor). In various examples, the radius of curvature, thickness, TTL (distance from the object side of the first lens to the imaging plane), 2IMGHT (diagonal length of the imaging plane), IMGHT (height of the imaging plane, or half of 2IMGHT), and lens focal length are expressed in millimeters (mm).

[0052] Lens thickness, inter-lens distance, and TTL refer to the lens distance calculated based on the optical axis of the imaging lens system. Furthermore, in the description of lens shape, a convex configuration indicates that the paraxial region of that surface is convex, and a concave configuration indicates that the paraxial region of that surface is concave. Therefore, even when describing a lens as having a convex surface, the lens edge can be concave. Similarly, even when describing a lens as having a concave surface, the lens edge can be convex.

[0053] The imaging lens systems described in the various examples can be configured to be mounted on portable electronic devices. In these examples, by way of non-limiting example, the imaging lens system can be mounted on smartphones, laptops, augmented reality devices, virtual reality devices, portable game consoles, etc. The scope and examples of the imaging lens systems described in one or more examples are not limited to the aforementioned electronic devices. In these examples, the imaging lens system can provide a narrow mounting space but can be applied to electronic devices requiring high-resolution imaging.

[0054] An exemplary imaging lens system according to the first example may include a plurality of lenses. In the example, the imaging lens system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially from the object side to the imaging side. The imaging lens system according to the first example may include lenses having a predetermined refractive power. In the example, the imaging lens system according to the first example may include a second lens having positive refractive power and a fourth lens having positive refractive power.

[0055] The imaging lens system according to the first example may have a ratio (BFL / TTL) between BFL (distance from the image-side surface of the eighth lens (or the last lens) to the imaging plane) and TTL (distance from the object-side surface of the first lens to the imaging plane), which may have a unique numerical range. In the example, in the imaging lens system according to the first example, BFL / TTL may be greater than 0.15.

[0056] An imaging lens system according to the first example may include a lens with one of its surfaces recessed. In the example, in the imaging lens system according to the first example, a fourth lens may have a recessed image-side surface, a fifth lens may have a recessed object-side surface, and a sixth lens may have a recessed image-side surface. An imaging lens system according to the first example may also include a lens with one of its surfaces convex. In the example, in the imaging lens system according to the first example, a seventh lens may have a convex object-side surface.

[0057] An imaging lens system according to a second example of this disclosure may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially from the object side to the imaging side. In the imaging lens system according to the second example, the first lens and the second lens may have distinct refractive powers. In the example, both the first lens and the second lens may have positive refractive powers.

[0058] In addition to the first and second lenses, the imaging lens system according to the second example may also include lenses with positive refractive power. In the example, in the imaging lens system according to the second example, the seventh lens may have positive refractive power. The lens with positive refractive power in the imaging lens system according to the second example is not limited to the seventh lens. The imaging lens system according to the second example may include lenses with one of their surfaces recessed. In the example, in the imaging lens system according to the second example, the fifth lens may have a recessed object-side surface.

[0059] The imaging lens system according to the second example can satisfy a predetermined conditional expression. In the example, in the imaging lens system according to the second example, the ratio (BFL / TTL) between the distance from the image side of the eighth lens to the imaging plane (BFL) and the distance from the object side of the first lens to the imaging plane (TTL) can be greater than 0.2 and less than 0.35.

[0060] The imaging lens system according to the third example may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially from the object side to the imaging side. In the imaging lens system according to the third example, the first lens and the second lens may have distinct refractive powers. In the example, both the first lens and the second lens may have positive refractive powers.

[0061] In addition to the first and second lenses, the imaging lens system according to the third example may also include lenses with positive refractive power. In the example, in the imaging lens system according to the third example, at least one of the fourth to seventh lenses may have positive refractive power.

[0062] The imaging lens system according to the third example can have a relatively large BFL. In the example, in the imaging lens system according to the third example, the BFL can be longer than 2.0 mm and shorter than 3.0 mm.

[0063] The imaging lens system according to the fourth example may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially from the object side to the imaging side, and may satisfy one or more of the following conditional expressions:

[0064] -20 <V1-V2<20

[0065] -10 <V1-V3<45

[0066] -10 <V1-V4<30

[0067] -10 <V1-V5<45

[0068] 0 <f1 / f<8.0

[0069] 0 <f2 / f<3.0

[0070] f3 / f<0

[0071] -10 <f4 / f<10

[0072] -15 <f5 / f<10

[0073] -10 <f6 / f<60

[0074] 0 <f7 / f

[0075] f8 / f<0

[0076] TTL / f < 1.5

[0077] 0 <f1 / f2<10

[0078] -2.0 <f2 / f3<0

[0079] BFL / f < 0.4

[0080] D12 / f<0.3

[0081] TTL / 2IMGHT<0.8

[0082] (TTL-BFL) / 2IMGHT<0.65

[0083] In the above conditional expressions, 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. 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, f7 is the focal length of the seventh lens, f8 is the focal length of the eighth lens, D12 is the distance from the image side of the first lens to the object side of the second lens, and 2IMGHT is the diagonal length of the imaging plane.

[0084] The imaging lens system according to the fourth example can also satisfy the following conditional expression:

[0085] -2.0 <f3 / f<-1.0

[0086] 3.0 <f4 / f<7.0

[0087] -4.0 <f5 / f<8.0

[0088] 0.4 <f7 / f<2.0

[0089] -1.0 <f8 / f<0

[0090] 0.9 <TTL / f<1.2

[0091] 0.19 <BFL / f<0.40

[0092] 0 <D12 / f<0.3

[0093] 0.6 <TTL / 2IMGHT<0.7

[0094] 0.4 < (TTL - BFL) / 2IMGHT < 0.56

[0095] 0.02 <BFL / f1<0.16

[0096] 0.2 <BFL / f2<0.4

[0097] -0.3 <BFL / f3<-0.1

[0098] 0.06 <T1 / IMGHT<0.1

[0099] 0.6 <EPD / IMGHT<0.8

[0100] 1.3 <SumT / BFL<3.0

[0101] In the above conditional expression, T1 is the thickness of the first lens, IMGHT is the height of the imaging plane, EPD is the diameter of the incident pupil, and SumT is the sum of the thicknesses of the first to the eighth lenses.

[0102] If necessary, the imaging lens system according to the first to fourth examples may include one or more lenses having the following characteristics. In the examples, the imaging lens system according to the first example may include one of the first to eighth lenses having the following characteristics. In another example, the imaging lens system according to the second example may include two or more of the first to eighth lenses having the following characteristics. The imaging lens system according to the above examples may not necessarily include lenses having the following characteristics.

[0103] The characteristics of the first to eighth lenses will be described below.

[0104] The first lens may have refractive power. In the example, the first lens may have positive refractive power. The first lens may have a shape in which one of its surfaces is convex. In the example, the first lens may have a convex object-side surface. The first lens may include a spherical surface or an aspherical surface. In the example, both surfaces of the first lens may be aspherical. In the example, the first lens may be formed of a material with high light transmittance and excellent processability. In the example, the first lens may be formed of a plastic material or a glass material. The first lens may be configured to have a predetermined refractive index. In the example, the refractive index of the first lens may be less than 1.6. As a specific example, the refractive index of the first lens may be greater than 1.52 and less than 1.57. The first lens may have a predetermined Abbe number. In the example, the Abbe number of the first lens may be less than 60. As a specific example, the Abbe number of the first lens may be greater than 53 and less than 58.

[0105] The second lens has refractive power. In the example, the second lens may have positive refractive power. The second lens may have a shape in which one of its surfaces is concave. In the example, the second lens may have a concave image-side surface. The second lens may include a spherical surface or an aspherical surface. For example, both surfaces of the second lens may be aspherical. The second lens may be formed of a material with high light transmittance and excellent processability. For example, the second lens may be formed of a plastic material or a glass material. The second lens may be configured to have a predetermined refractive index. For example, the refractive index of the second lens may be less than 1.6. As a specific example, the refractive index of the second lens may be greater than 1.52 and less than 1.60. The second lens may have a predetermined Abbe number. For example, the Abbe number of the second lens may be 50 or greater. As a specific example, the Abbe number of the second lens may be greater than 50 and less than 60.

[0106] The third lens may have refractive power. For example, the third lens may have negative refractive power. The third lens may have a shape in which one of its surfaces is convex. For example, the third lens may have a convex object-side surface. The third lens may include a spherical surface or an aspherical surface. In the example, both surfaces of the third lens may be aspherical. The third lens may be formed of a material with high light transmittance and excellent processability. In the example, the third lens may be formed of a plastic material or a glass material. The third lens may be configured to have a predetermined refractive index. For example, the refractive index of the third lens may be greater than 1.6. As a specific example, the refractive index of the third lens may be greater than 1.62 and less than 1.7. The third lens may have a predetermined Abbe number. In the example, the Abbe number of the third lens may be less than 30. As a specific example, the Abbe number of the third lens may be greater than 18 and less than 30.

[0107] The fourth lens may have refractive power. In the example, the fourth lens may have positive refractive power. The fourth lens may have a shape in which one of its surfaces is concave. For example, the fourth lens may have a concave image-side surface. The fourth lens may include a spherical surface or an aspherical surface. For example, both surfaces of the fourth lens may be aspherical. The fourth lens may be formed of a material with high light transmittance and excellent processability. For example, the fourth lens may be formed of a plastic material or a glass material. The fourth lens may be configured to have a predetermined refractive index. For example, the refractive index of the fourth lens may be less than 1.6. As a specific example, the refractive index of the fourth lens may be greater than 1.5 and less than 1.6. The fourth lens may have a predetermined Abbe number. For example, the Abbe number of the fourth lens may be 30 or greater. As a specific example, the Abbe number of the fourth lens may be greater than 30 and less than 60.

[0108] The fifth lens may have refractive power. For example, the fifth lens may have positive or negative refractive power. The fifth lens may have a shape in which one of its surfaces is concave. For example, the fifth lens may have a concave object-side surface. The fifth lens may include a spherical surface or an aspherical surface. In this example, both surfaces of the fifth lens may be aspherical. The fifth lens may be formed of a material with high light transmittance and excellent processability. For example, the fifth lens may be formed of a plastic material or a glass material. The fifth lens may be configured to have a predetermined refractive index. For example, the refractive index of the fifth lens may be greater than 1.6. As a specific example, the refractive index of the fifth lens may be greater than 1.6 and less than 1.7. The fifth lens may have a predetermined Abbe number. For example, the Abbe number of the fifth lens may be less than 30. As a specific example, the Abbe number of the fifth lens may be greater than 18 and less than 30.

[0109] The sixth lens may have refractive power. For example, the sixth lens may have positive or negative refractive power. The sixth lens may have a shape where one of its surfaces is concave. For example, the sixth lens may have a concave image-side surface or a concave object-side surface. The sixth lens may include spherical or aspherical surfaces. For example, both surfaces of the sixth lens may be aspherical. In an example, inflection points may be formed on one or both surfaces of the sixth lens. For example, inflection points may be formed on the object-side and image-side surfaces of the sixth lens. The sixth lens may be formed from a material with high light transmittance and excellent processability. For example, the sixth lens may be formed from a plastic material or a glass material. The sixth lens may be configured to have a predetermined refractive index. For example, the refractive index of the sixth lens may be greater than 1.6. As a specific example, the refractive index of the sixth lens may be greater than 1.62 and less than 1.67. The sixth lens may have a predetermined Abbe number. For example, the Abbe number of the sixth lens may be less than 30. As a specific example, the Abbe number of the sixth lens may be greater than 20 and less than 30.

[0110] The seventh lens can have refractive power. For example, the seventh lens can have positive refractive power. The seventh lens can have a shape where one of its surfaces is convex. For example, the seventh lens can have a convex object-side surface. The seventh lens can include spherical or aspherical surfaces. For example, both surfaces of the seventh lens can be aspherical. In an example, inflection points can be formed on one or both surfaces of the seventh lens. For example, inflection points can be formed on the object-side and image-side surfaces of the seventh lens. Additionally, in a non-limiting example, concave and convex shapes can be formed together on one or both surfaces of the seventh lens. For example, the optical axis portion can be convex on the object-side surface of the seventh lens, and the peripheral portion of the optical axis can be concave on the object-side surface of the seventh lens. In an example, the optical axis portion can be concave or convex on the image-side surface of the seventh lens, and the peripheral portion of the optical axis can be convex or concave on the image-side surface of the seventh lens, respectively. The seventh lens can be formed from a material with high light transmittance and excellent processability. For example, the seventh lens can be formed from a plastic material or a glass material. The seventh lens can be configured to have a refractive index. For example, the refractive index of the seventh lens can be less than 1.6. As a specific example, the refractive index of the seventh lens can be greater than 1.52 and less than 1.6. The seventh lens can have a predetermined Abbe number. For example, the Abbe number of the seventh lens can be less than 50. As a specific example, the Abbe number of the seventh lens can be greater than 30 and less than 50.

[0111] The eighth lens may have refractive power. For example, the eighth lens may have negative refractive power. The eighth lens may have a shape in which one surface of the eighth lens is convex. For example, the eighth lens may have a convex object-side surface. The eighth lens may include a spherical surface or an aspherical surface. For example, both surfaces of the eighth lens may be aspherical. In an example, inversion points may be formed on one or both surfaces of the eighth lens. For example, inversion points may be formed on the object-side and image-side surfaces of the eighth lens. Additionally, concave and convex shapes may be formed together on one or both surfaces of the eighth lens. For example, the optical axis portion may be convex on the object-side surface of the eighth lens, and the peripheral portion of the optical axis may be concave on the object-side surface of the eighth lens. As another example, the optical axis portion may be concave on the object-side surface of the eighth lens, and the peripheral portion of the optical axis may be convex on the object-side surface of the eighth lens. As another example, the optical axis portion may be concave on the image-side surface of the eighth lens, and the peripheral portion of the optical axis may be convex on the image-side surface of the eighth lens. The eighth lens may be formed from a material with high light transmittance and excellent processability. For example, the eighth lens can be formed of plastic or glass. The eighth lens can be configured to have a predetermined refractive index. For example, the refractive index of the eighth lens can be less than 1.6. As a specific example, the refractive index of the eighth lens can be greater than 1.50 and less than 1.57. The eighth lens can have a predetermined Abbe number. For example, the Abbe number of the eighth lens can be less than 60. As a specific example, the Abbe number of the eighth lens can be greater than 52 and less than 60.

[0112] As described above, the first to eighth lenses may include spherical or aspherical surfaces. When the first to eighth lenses include aspherical surfaces, the aspherical surface of the corresponding lens can be represented by the following Equation 1:

[0113] Equation 1:

[0114]

[0115] In Equation 1, c is the reciprocal of the radius of curvature of the corresponding lens, k is the quadratic constant, r is the distance from any point on the aspherical surface to the optical axis, A to J are aspherical constants, and Z (or SAG) is the height from a predetermined point on the aspherical surface to the vertex of the corresponding aspherical surface in the direction of the optical axis.

[0116] An imaging lens system according to one or more examples may further include an aperture stop and a filter. In one example, the imaging lens system may further include an aperture stop disposed between a third lens and a fourth lens, or between a fourth lens and a fifth lens. The aperture stop may be configured to adjust the amount of light incident in the direction of the imaging plane. In one or more examples, the imaging lens system may further include a filter disposed between an eighth lens and the imaging plane. The filter may be configured to block light of a specific wavelength. In one example, the filter may be configured to block infrared light. However, this is merely an example, and the wavelengths of light blocked by the filter are not limited to infrared light.

[0117] A camera module or device according to one or more embodiments may include one or more imaging lens systems according to the examples described above. In the examples, according to one or more examples, the camera module may include an imaging lens system. In the examples, the camera module may include an imaging lens system according to one example and an imaging lens system according to another example.

[0118] According to one example, a camera module can be configured to have variable dimensions. Specifically, the length CL from the foremost point of the camera module (e.g., the object side of the first lens) to the image sensor can vary depending on the operating state of the camera module. In a non-limiting example, the length CL in the operating state of the camera module can be greater than the length CL in the non-operating state of the camera module.

[0119] According to another example, the camera module may include an imaging lens system capable of changing the size of the camera module. In the example, the camera module may include an imaging lens system comprising a first to an eighth lens arranged sequentially from the object side. Additionally, the camera module may include an image sensor configured to convert light signals incident by the imaging lens system into electrical signals.

[0120] The camera module can be configured to move the imaging lens system toward the image sensor. For example, the camera module can move the imaging lens system toward the image sensor to perform focus adjustment or focus magnification adjustment. The camera module can also be configured to move the imaging lens system toward the image sensor to reduce the size of the camera module. The displacement of the imaging lens system according to the latter can be greater than the displacement of the imaging lens system according to the former. Specifically, the displacement of the imaging lens system according to the latter can be represented by the following conditional expression:

[0121] 0.7 < (BFLx - BFLm) / BFLx < 0.9

[0122] In the above conditional expressions, BFLx is the distance from the image side of the last lens (e.g., the eighth lens in an imaging lens system consisting of eight (8) lenses) to the image sensor when the imaging lens system is at its furthest point from the image sensor, and BFLm is the distance from the image side of the last lens to the image sensor when the imaging lens system is at its closest point to the image sensor.

[0123] In the above description, a configuration of an imaging lens system comprising eight (8) lenses has been shown. However, this is merely an example, and the number of lenses constituting an imaging lens system is not limited to eight (8). In the example, a camera module according to one or more embodiments may include an imaging lens system having nine (9) lenses. However, this is merely an example, and a camera module may include multiple lenses with fewer or more than nine lenses.

[0124] A camera module according to one or more embodiments can satisfy the above-mentioned conditional expression 0.7 < (BFLx - BFLm) / BFLx < 0.9 to facilitate mounting in a thinner form, and can also satisfy other conditions for achieving high resolution. For example, the camera module may include a relatively large image sensor to facilitate high resolution. Specifically, in a non-limiting example, the image height (height of the imaging plane) that can be substantially formed in the image sensor can be 7.0 mm to 9.0 mm.

[0125] In the following description, a specific implementation of the imaging lens system will be described with reference to the accompanying drawings.

[0126] First, refer to Figure 1 An exemplary imaging lens system according to the first example is described.

[0127] An exemplary 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, a seventh lens 170, and an eighth lens 180.

[0128] 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 positive refractive power and can have a convex object-side surface and a concave image-side surface. The third lens 130 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. The fourth lens 140 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The fifth lens 150 can have negative refractive power and can have a concave object-side surface and a convex image-side surface. The sixth lens 160 can have positive refractive power and can have a concave object-side surface and a convex image-side surface. Furthermore, a curvature point can be formed on the object-side surface and image-side surface of the sixth lens 160. The seventh lens 170 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. Additionally, a curvature point can be formed on the object-side surface and image-side surface of the seventh lens 170. The eighth lens 180 has negative refractive power and can have a convex object-side surface and a concave image-side surface. In addition, inversion points can be formed on the object side and image side of the eighth lens 180.

[0129] The exemplary imaging lens system 100 may further include a filter IF and an imaging surface IP. The filter IF may be disposed between the eighth lens 180 and the imaging surface IP. The filter IF may be omitted if necessary. The imaging surface IP may be formed on a surface of the image sensor IS of the camera module, or formed inside the image sensor IS. The location of the imaging surface IP is not limited to a surface of the image sensor IS or a location inside the image sensor IS.

[0130] Tables 1 and 2 below show the lens characteristics and aspherical values ​​of an exemplary imaging lens system according to this example. Figure 2 It is the aberration curve based on the imaging lens system of this example.

[0131] Table 1

[0132]

[0133]

[0134] Table 2

[0135] Face number S1 S2 S3 S4 S5 S6 S7 S8 k -3.26E+00 -8.10E+00 -3.89E+00 -5.56E+01 1.70E+01 6.02E+00 -1.93E+01 6.10E+01 A 4.67E-03 5.36E-03 1.28E-03 -5.97E-03 -6.01E-03 -3.66E-03 -1.81E-03 -3.64E-03 B -8.16E-04 -3.32E-03 -1.03E-03 9.00E-04 2.20E-03 5.55E-04 8.99E-04 2.07E-05 C 5.57E-04 1.97E-03 1.62E-03 -3.44E-04 -2.11E-04 7.88E-04 -4.16E-03 -8.25E-05 D -5.05E-04 -1.25E-03 -1.82E-03 7.93E-04 1.52E-04 -1.42E-03 7.88E-03 -2.60E-04 E 3.32E-04 7.11E-04 1.54E-03 -8.82E-04 -9.51E-05 1.54E-03 -9.49E-03 7.01E-04 F -1.62E-04 -3.26E-04 -9.28E-04 5.90E-04 -9.96E-05 -1.26E-03 7.93E-03 -6.76E-04 G 5.76E-05 1.15E-04 4.00E-04 -2.65E-04 1.60E-04 7.50E-04 -4.72E-03 3.67E-04 H -1.49E-05 -3.05E-05 -1.24E-04 8.38E-05 -9.93E-05 -3.14E-04 2.03E-03 -1.16E-04 J 2.80E-06 5.99E-06 2.77E-05 -1.88E-05 3.63E-05 9.16E-05 -6.34E-04 1.74E-05 Face number S9 S10 S11 S12 S13 S14 S15 S16 k -2.46E+01 -9.60E+01 1.54E+01 -8.04E+01 -1.12E+01 -8.97E+01 -4.03E+01 -7.81E+00 A -1.37E-02 -1.13E-02 -1.33E-02 -2.21E-02 5.26E-03 2.21E-02 -3.83E-02 -3.04E-02 B 1.87E-04 -1.53E-03 5.75E-04 8.76E-04 -7.82E-03 -9.36E-03 9.04E-03 7.05E-03 C -2.83E-04 4.14E-03 2.03E-03 2.18E-03 2.59E-03 1.54E-03 -2.11E-03 -1.42E-03 D -7.98E-04 -5.67E-03 -1.75E-03 -1.20E-03 -5.90E-04 1.16E-05 4.34E-04 2.37E-04 E 1.86E-03 4.93E-03 7.91E-04 3.44E-04 1.01E-04 -6.68E-05 -6.49E-05 -3.04E-05 F -2.07E-03 -3.00E-03 -2.52E-04 -5.68E-05 -1.34E-05 1.70E-05 6.77E-06 2.91E-06 G 1.48E-03 1.33E-03 6.19E-05 2.85E-06 1.36E-06 -2.48E-06 -4.97E-07 -2.05E-07 H -7.24E-04 -4.30E-04 -1.24E-05 9.81E-07 -9.90E-08 2.41E-07 2.61E-08 1.05E-08 J 2.48E-04 1.02E-04 2.16E-06 -2.60E-07 4.76E-09 -1.64E-08 -9.83E-10 -3.88E-10

[0136] Reference Figure 3 An exemplary imaging lens system according to the second example is described.

[0137] An exemplary 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, a seventh lens 270, and an eighth lens 280.

[0138] 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 positive refractive power and can have a convex object-side surface and a concave image-side surface. The third lens 230 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. The fourth lens 240 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The fifth lens 250 can have negative refractive power and can have a concave object-side surface and a concave 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, a curvature point can be formed on the object-side surface and image-side surface of the sixth lens 260. The seventh lens 270 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. Furthermore, a curvature point can be formed on the object-side surface and image-side surface of the seventh lens 270. The eighth lens 280 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. In addition, inversion points can be formed on the object side and image side of the eighth lens 280.

[0139] The exemplary imaging lens system 200 may also include a filter IF and an imaging surface IP. The filter IF may be disposed between the eighth lens 280 and the imaging surface IP. The filter IF may be omitted if desired. The imaging surface IP may be formed on a surface of the image sensor IS of the camera module, or formed inside the image sensor IS.

[0140] Tables 3 and 4 below show the lens characteristics and aspherical values ​​of an exemplary imaging lens system according to this example. Figure 4 It is the aberration curve based on the imaging lens system of this example.

[0141] Table 3

[0142]

[0143]

[0144] Table 4

[0145] Face number S1 S2 S3 S4 S5 S6 S7 S8 k -3.55E+00 -1.01E+01 -4.01E+00 -9.60E+01 2.01E+01 5.98E+00 -1.78E+01 2.02E+01 A 6.06E-03 3.43E-03 7.27E-05 -3.70E-03 -3.29E-03 -5.70E-03 -4.03E-03 -4.23E-03 B -4.02E-04 -1.60E-03 4.29E-04 -2.07E-03 -9.39E-04 -1.00E-03 1.18E-03 -2.80E-03 C -7.37E-04 -7.51E-04 -1.78E-03 -9.95E-04 -4.10E-04 5.49E-03 -3.24E-03 8.57E-03 D 6.67E-04 1.56E-03 2.81E-03 4.24E-03 2.32E-03 -1.09E-02 5.91E-03 -1.64E-02 E -3.58E-04 -1.24E-03 -2.47E-03 -4.26E-03 -1.91E-03 1.35E-02 -6.91E-03 2.12E-02 F 1.18E-04 6.30E-04 1.47E-03 2.56E-03 7.35E-04 -1.13E-02 5.63E-03 -1.90E-02 G -2.27E-05 -2.18E-04 -6.07E-04 -1.06E-03 -9.15E-05 6.56E-03 -3.25E-03 1.21E-02 H 1.65E-06 5.26E-05 1.79E-04 3.12E-04 -4.58E-05 -2.70E-03 1.35E-03 -5.53E-03 J 3.38E-07 -8.98E-06 -3.81E-05 -6.69E-05 2.74E-05 7.92E-04 -4.02E-04 1.82E-03 Face number S9 S10 S11 S12 S13 S14 S15 S16 k -1.59E+01 -9.60E+01 9.60E+01 4.94E+01 -8.67E+00 -7.82E+01 -7.19E+01 -8.25E+00 A -1.23E-02 -1.22E-02 -2.58E-02 -3.16E-02 5.79E-03 1.72E-02 -7.17E-02 -4.68E-02 B 1.20E-03 -2.46E-03 3.08E-03 1.11E-03 -1.13E-02 -4.85E-03 2.59E-02 1.63E-02 C -4.58E-03 7.41E-03 3.09E-03 4.06E-03 4.98E-03 -1.49E-03 -7.78E-03 -4.44E-03 D 6.21E-03 -9.66E-03 -1.50E-03 -1.93E-03 -1.81E-03 1.42E-03 1.84E-03 9.27E-04 E -5.10E-03 7.93E-03 -9.22E-04 2.97E-05 5.58E-04 -5.24E-04 -3.15E-04 -1.46E-04 F 2.18E-03 -4.70E-03 1.31E-03 3.85E-04 -1.44E-04 1.23E-04 3.81E-05 1.72E-05 G -2.77E-05 2.08E-03 -7.25E-04 -2.19E-04 3.01E-05 -2.02E-05 -3.30E-06 -1.51E-06 H -5.37E-04 -6.87E-04 2.47E-04 6.79E-05 -4.92E-06 2.39E-06 2.07E-07 9.90E-08 J 3.36E-04 1.69E-04 -5.65E-05 -1.36E-05 6.19E-07 -2.06E-07 -9.44E-09 -4.79E-09

[0146] Reference Figure 5 Describes an exemplary imaging lens system according to the third example.

[0147] An exemplary 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, a seventh lens 370, and an eighth lens 380.

[0148] 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 positive refractive power and can have a convex object-side surface and a concave image-side surface. The third lens 330 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. The fourth lens 340 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The fifth lens 350 has negative refractive power and can have a concave object-side surface and a concave 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, a curvature point can be formed on the object-side surface and image-side surface of the sixth lens 360. The seventh lens 370 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. Furthermore, a curvature point can be formed on the object-side surface and image-side surface of the seventh lens 370. The eighth lens 380 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. In addition, inversion points can be formed on the object side and image side of the eighth lens 380.

[0149] The exemplary imaging lens system 300 may also include a filter IF and an imaging surface IP. The filter IF may be disposed between the eighth lens 380 and the imaging surface IP. The filter IF may be omitted if desired. The imaging surface IP may be formed on a surface of the image sensor IS of the camera module, or it may be formed inside the image sensor IS.

[0150] Tables 5 and 6 below show the lens characteristics and aspherical values ​​of an exemplary imaging lens system according to this example. Figure 6 It is the aberration curve based on the imaging lens system of this example.

[0151] Table 5

[0152]

[0153]

[0154] Table 6

[0155] Face number S1 S2 S3 S4 S5 S6 S7 S8 k -4.08E+00 -1.37E+01 -4.57E+00 2.34E+01 3.24E+01 5.98E+00 -1.12E+01 2.05E+01 A 7.33E-03 9.03E-03 7.33E-04 -2.31E-03 -1.63E-04 -3.18E-03 -4.66E-03 -5.39E-03 B -1.26E-03 -6.21E-03 -6.94E-04 -5.22E-03 -5.92E-03 -4.08E-03 2.83E-03 -1.53E-05 C 1.89E-04 1.62E-03 -1.10E-03 5.34E-03 6.90E-03 7.51E-03 -8.83E-03 2.74E-03 D -2.17E-04 1.29E-04 2.01E-03 -2.88E-03 -3.83E-03 -9.42E-03 1.72E-02 -7.17E-03 E 2.13E-04 -4.59E-04 -1.76E-03 8.70E-04 9.89E-04 9.07E-03 -2.12E-02 1.09E-02 F -1.38E-04 3.02E-04 1.05E-03 -8.68E-06 2.01E-04 -6.62E-03 1.79E-02 -1.06E-02 G 5.83E-05 -1.17E-04 -4.36E-04 -1.36E-04 -3.15E-04 3.60E-03 -1.06E-02 7.05E-03 H -1.68E-05 3.05E-05 1.30E-04 7.39E-05 1.53E-04 -1.44E-03 4.52E-03 -3.29E-03 J 3.38E-06 -5.47E-06 -2.78E-05 -2.22E-05 -4.52E-05 4.23E-04 -1.39E-03 1.09E-03 Face number S9 S10 S11 S12 S13 S14 S15 S16 k 9.64E+01 7.08E+01 7.57E+01 -9.65E+01 -4.88E+00 9.37E+01 -3.00E+01 -7.38E+00 A -1.41E-02 -1.78E-02 -2.94E-02 -3.54E-02 4.71E-03 2.16E-02 -7.13E-02 -4.87E-02 B 3.27E-03 1.10E-03 6.10E-03 5.85E-03 -7.88E-03 -2.19E-03 3.06E-02 1.86E-02 C -5.17E-03 6.99E-03 1.50E-03 5.88E-04 2.00E-03 -4.58E-03 -1.10E-02 -5.92E-03 D 6.73E-03 -1.39E-02 -2.63E-03 -5.17E-04 -4.47E-04 2.72E-03 2.93E-03 1.43E-03 E -7.14E-03 1.48E-02 1.39E-03 -3.94E-05 1.55E-04 -8.36E-04 -5.35E-04 -2.51E-04 F 5.52E-03 -1.06E-02 -3.96E-04 1.32E-04 -5.39E-05 1.68E-04 6.76E-05 3.22E-05 G -3.04E-03 5.39E-03 3.46E-05 -6.59E-05 1.25E-05 -2.35E-05 -6.00E-06 -3.01E-06 H 1.19E-03 -1.98E-03 1.96E-05 1.87E-05 -1.87E-06 2.38E-06 3.77E-07 2.06E-07 J -3.27E-04 5.23E-04 -9.25E-06 -3.44E-06 1.86E-07 -1.74E-07 -1.68E-08 -1.03E-08

[0156] Reference Figure 7 An exemplary imaging lens system according to the fourth example is described.

[0157] An exemplary imaging lens system 400 may include a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, a sixth lens 460, a seventh lens 470, and an eighth lens 480.

[0158] The first lens 410 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The second lens 420 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The third lens 430 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. The fourth lens 440 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The fifth lens 450 can have negative refractive power and can have a concave object-side surface and a concave image-side surface. The sixth lens 460 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. Additionally, a curvature point can be formed on the object-side surface and image-side surface of the sixth lens 460. The seventh lens 470 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. Additionally, a curvature point can be formed on the object-side surface and image-side surface of the seventh lens 470. The eighth lens 480 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. In addition, inversion points can be formed on the object side and image side of the eighth lens 480.

[0159] The exemplary imaging lens system 400 may also include a filter IF and an imaging surface IP. The filter IF may be disposed between the eighth lens 480 and the imaging surface IP. The filter IF may be omitted if desired. The imaging surface IP may be formed on a surface of the image sensor IS of the camera module, or it may be formed inside the image sensor IS.

[0160] Tables 7 and 8 show the lens characteristics and aspherical values ​​of an exemplary imaging lens system according to this example. Figure 8 Aberration curves of an exemplary imaging lens system according to this example are shown.

[0161] Table 7

[0162]

[0163]

[0164] Table 8

[0165] Face number S1 S2 S3 S4 S5 S6 S7 S8 k -4.10E+00 -1.33E+01 -4.59E+00 -5.84E+01 3.28E+01 5.98E+00 -1.46E+01 1.85E+01 A 7.32E-03 7.95E-03 4.71E-04 -2.21E-03 1.11E-03 -3.14E-03 -5.00E-03 -5.02E-03 B -1.46E-03 -5.64E-03 -1.08E-03 -5.74E-03 -5.73E-03 -2.09E-03 2.91E-03 -1.07E-03 C 3.39E-04 1.84E-03 4.01E-04 4.27E-03 4.88E-03 3.98E-03 -6.65E-03 5.88E-03 D -2.53E-04 -3.04E-04 -3.56E-05 -5.37E-04 -1.58E-03 -5.25E-03 1.24E-02 -1.21E-02 E 1.73E-04 -1.28E-04 3.82E-05 -1.26E-03 -3.34E-04 4.95E-03 -1.50E-02 1.64E-02 F -9.08E-05 1.35E-04 -4.43E-05 1.19E-03 6.04E-04 -3.36E-03 1.26E-02 -1.51E-02 G 3.39E-05 -5.99E-05 3.02E-05 -6.00E-04 -3.21E-04 1.64E-03 -7.47E-03 9.83E-03 H -8.98E-06 1.67E-05 -1.30E-05 2.01E-04 1.03E-04 -5.74E-04 3.18E-03 -4.57E-03 J 1.69E-06 -3.15E-06 3.66E-06 -4.75E-05 -2.24E-05 1.43E-04 -9.71E-04 1.52E-03 Face number S9 S10 S11 S12 S13 S14 S15 S16 k 8.60E+01 9.64E+01 7.50E+01 -9.65E+01 -5.23E+00 -3.58E+01 -3.66E+01 -8.10E+00 A -1.26E-02 -1.44E-02 -2.77E-02 -3.56E-02 2.44E-03 1.40E-02 -7.85E-02 -5.05E-02 B 1.03E-03 -5.76E-04 7.72E-03 8.57E-03 -4.27E-03 4.57E-03 3.39E-02 1.98E-02 C -1.07E-03 6.66E-03 -2.89E-03 -3.67E-03 2.55E-04 -7.42E-03 -1.17E-02 -6.30E-03 D -4.85E-04 -1.14E-02 2.67E-03 3.18E-03 -5.40E-06 3.45E-03 2.93E-03 1.50E-03 E 2.46E-03 1.14E-02 -2.70E-03 -2.18E-03 1.01E-04 -9.60E-04 -4.95E-04 -2.63E-04 F -3.46E-03 -7.87E-03 1.78E-03 1.01E-03 -5.63E-05 1.81E-04 5.56E-05 3.37E-05 G 2.90E-03 3.87E-03 -7.95E-04 -3.20E-04 1.47E-05 -2.44E-05 -4.02E-06 -3.17E-06 H -1.62E-03 -1.37E-03 2.48E-04 7.19E-05 -2.31E-06 2.40E-06 1.66E-07 2.20E-07 J 6.21E-04 3.52E-04 -5.50E-05 -1.14E-05 2.35E-07 -1.71E-07 -1.29E-09 -1.13E-08

[0166] Reference Figure 9 An exemplary imaging lens system according to the fifth example is described.

[0167] An exemplary imaging lens system 500 may include a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, a sixth lens 560, a seventh lens 570, and an eighth lens 580.

[0168] The first lens 510 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The second lens 520 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The third lens 530 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. The fourth lens 540 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The fifth lens 550 can have negative refractive power and can have a concave object-side surface and a concave image-side surface. The sixth lens 560 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. Furthermore, a curvature point can be formed on the object-side surface and image-side surface of the sixth lens 560. The seventh lens 570 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. Additionally, a curvature point can be formed on the object-side surface and image-side surface of the seventh lens 570. The eighth lens 580 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. In addition, inversion points can be formed on the object side and image side of the eighth lens 580.

[0169] The exemplary imaging lens system 500 may also include a filter IF and an imaging surface IP. The filter IF may be disposed between the eighth lens 580 and the imaging surface IP. The filter IF may be omitted if desired. The imaging surface IP may be formed on a surface of the image sensor IS of the camera module, or it may be formed inside the image sensor IS.

[0170] Tables 9 and 10 show the lens characteristics and aspherical values ​​of the imaging lens system according to this example. Figure 10 These are aberration curves based on the exemplary imaging lens system of this example.

[0171] Table 9

[0172]

[0173]

[0174] Table 10

[0175]

[0176]

[0177] Reference Figure 11 The exemplary imaging lens system according to the sixth example is described.

[0178] An exemplary imaging lens system 600 may include a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, a fifth lens 650, a sixth lens 660, a seventh lens 670, and an eighth lens 680.

[0179] The first lens 610 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The second lens 620 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The third lens 630 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. The fourth lens 640 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The fifth lens 650 can have negative refractive power and can have a concave object-side surface and a concave image-side surface. The sixth lens 660 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. Furthermore, inflection points can be formed on the object-side surface and image-side surface of the sixth lens 660. The seventh lens 670 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. Furthermore, inflection points can be formed on the object-side surface and image-side surface of the seventh lens 670. The eighth lens 680 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. In addition, inversion points can be formed on the object side and image side of the eighth lens 680.

[0180] The exemplary imaging lens system 600 may also include a filter IF and an imaging surface IP. The filter IF may be disposed between the eighth lens 680 and the imaging surface IP. The filter IF may be omitted if desired. The imaging surface IP may be formed on a surface of the image sensor IS of the camera module, or it may be formed inside the image sensor IS.

[0181] Tables 11 and 12 show the lens characteristics and aspherical values ​​of an exemplary imaging lens system according to this example. Figure 12 It is the aberration curve based on the imaging lens system of this example.

[0182] Table 11

[0183]

[0184]

[0185] Table 12

[0186]

[0187]

[0188] Reference Figure 13 An exemplary imaging lens system according to the seventh example is described.

[0189] An exemplary imaging lens system 700 may include a first lens 710, a second lens 720, a third lens 730, a fourth lens 740, a fifth lens 750, a sixth lens 760, a seventh lens 770, and an eighth lens 780.

[0190] The first lens 710 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The second lens 720 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The third lens 730 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. The fourth lens 740 can have positive refractive power and can have a convex object-side surface and a concave image-side surface. The fifth lens 750 can have positive refractive power and can have a concave object-side surface and a convex image-side surface. The sixth lens 760 can have negative refractive power and can have a concave object-side surface and a concave image-side surface. Furthermore, a curvature point can be formed on the object-side surface and image-side surface of the sixth lens 760. The seventh lens 770 can have positive refractive power and can have a convex object-side surface and a convex image-side surface. Furthermore, a curvature point can be formed on the object-side surface and image-side surface of the seventh lens 770. The eighth lens 780 can have negative refractive power and can have a convex object-side surface and a concave image-side surface. In addition, inversion points can be formed on the object side and image side of the eighth lens 780.

[0191] The imaging lens system 700 may also include a filter IF and an imaging surface IP. The filter IF may be disposed between the eighth lens 780 and the imaging surface IP. The filter IF may be omitted if necessary. The imaging surface IP may be formed on a surface of the image sensor IS of the camera module, or it may be formed inside the image sensor IS.

[0192] Tables 13 and 14 show the lens characteristics and aspherical values ​​of an exemplary imaging lens system according to this example. Figure 14 These are aberration curves based on the exemplary imaging lens system of this example.

[0193] Table 13

[0194]

[0195]

[0196] Table 14

[0197]

[0198]

[0199] Tables 15 and 16 show the optical characteristic values ​​and conditional expression values ​​of exemplary imaging lens systems according to the first to seventh examples.

[0200] Table 15

[0201] First Example Second example Third Example Fourth example Fifth example Sixth example Seventh Example f1 65.8743 22.9285 28.3904 27.4041 33.8849 40.1006 64.0789 f2 8.0564 9.7674 8.4878 8.6827 8.3961 8.0711 7.3149 f3 -17.1843 -15.0945 -13.5982 -13.9512 -14.7736 -14.8039 -14.0873 f4 41.6320 35.4491 60.4611 59.2825 39.6036 37.1928 47.5993 f5 -28.4628 -28.2064 -36.6364 -36.0094 -22.3700 -29.7979 66.6672 f6 145.8869 317.7290 172.4647 393.3308 214.6103 -83.3340 -11.9430 f7 12.0278 7.5139 10.0579 9.7658 8.1852 8.1715 5.5481 f8 -8.2712 -5.7894 -7.6941 -7.6973 -7.0495 -7.1443 -5.5484 TTL 11.1750 10.7850 10.6850 10.6871 10.2981 10.2850 10.2850 BFL 2.4836 2.8768 2.7682 2.7584 2.6819 2.6537 2.6522 BFLx 2.4836 2.8768 2.7682 2.7584 2.6819 2.6537 2.6522 BFLm 0.6000 0.6000 0.6000 0.6000 0.6000 0.6000 0.6000 f 9.9600 9.8305 9.7959 9.7642 9.2833 9.3340 9.4014 f number 1.8242 1.7999 1.7717 1.7718 1.8130 1.7941 1.7894 IMGHT 8.1660 8.1660 8.1660 8.1660 8.5160 8.5160 8.5160 HFOV 77.0246 77.6735 78.1896 78.3402 81.2225 80.9177 80.6277

[0202] Table 16

[0203]

[0204]

[0205] In the following text, reference will be made to Figures 15 to 19 An example of an exemplary imaging lens system that reduces the thickness of a camera module.

[0206] like Figure 15 As shown, an exemplary camera module 20 according to one or more embodiments can be mounted on a portable terminal 1000. Specifically, in a non-limiting example, the exemplary camera module 20 can be mounted together with another type of camera module 10 on a surface of the portable terminal 1000. The target or base on which the exemplary camera module 20 can be mounted is not limited to the portable terminal.

[0207] An exemplary camera module 20 according to one or more embodiments can be configured to achieve a predetermined field of view. In the example, the field of view of the exemplary camera module 20 can be greater than that of the camera module 10. Specifically, compared to the exemplary camera module 10, the exemplary camera module 20 according to one or more embodiments can be configured to capture images of objects located at a short distance while having a higher resolution.

[0208] Reference Figure 16 The exemplary camera module 20 may include a first lens barrel 24, a second lens barrel 26, and an image sensor IS. The configuration of the exemplary camera module 20 is not limited to the components described above. In the example, the camera module 20 may also include a driver for driving the first lens barrel 24. The exemplary camera module 20 may include an imaging lens system 22. In the example, the exemplary camera module 20 may include an imaging lens system, for example, one of the imaging lens systems according to the first to seventh examples described above.

[0209] The exemplary camera module 20 can be configured such that its length CL in the optical axis direction is variable. In the example, the length CL of the exemplary camera module 20 in the optical axis direction can be varied from... Figure 16 The state shown is reduced to Figure 17 The state shown. The length CL of the camera module 20 in the optical axis direction can be... Figure 17 The state shown increases to Figure 16The variable length of camera module 20 in the optical axis direction can be substantially proportional to the distance from the rear lens to the image sensor IS. Specifically, the difference (BFLx-BFLm) between the distance BFLx from the rear lens to the image sensor IS in the operating state (or imaging state) of the exemplary camera module 20 and the distance BFLm from the rear lens to the image sensor IS in the non-operating state of the exemplary camera module 20 can have the following numerical relationship relative to the distance BFLx from the rear lens to the image sensor IS or the back focal length of the imaging lens system 22 in the operating state (or imaging state) of the camera module 20:

[0210] 0.6 < (BFLx - BFLm) / BFLx < 0.8

[0211] An exemplary camera module 20 may include an imaging lens system 22. In a non-limiting example, the exemplary camera module 20 may include an imaging lens system 22 consisting of eight (8) lenses. The configuration of the imaging lens system 22 is not limited to eight (8) lenses. For example, the imaging lens system 22 may be configured with six (6) or seven (7) lenses, or nine (9) or more lenses.

[0212] like Figure 18 and Figure 19 As shown, the exemplary imaging lens system 22 may include a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8. The configuration of the exemplary imaging lens system 22 is not limited to eight (8) lenses. For example, the imaging lens system 22 may consist of eight (8) or fewer lenses or nine (9) or more lenses. As a specific example, the imaging lens system 22 may include six (6) lenses. Additionally, the imaging lens system 22 may include a filter IF, as needed.

[0213] The first lens L1 to the eighth lens L8 can be arranged sequentially in the optical axis direction. For example, the second lens L2 can be arranged on the image side of the first lens L1, and the third lens L3 can be arranged on the image side of the second lens L2. Therefore, in the imaging lens system 22 according to this embodiment, no optical element other than the filter IF or the image sensor IS can be arranged on the image side of the eighth lens L8, which may be the last lens. The first lens L1 to the eighth lens L8 can be configured to form an image of the incident light at a predetermined position. For example, the light refracted by the first lens L1 to the eighth lens L8 can form an image on the imaging surface IP formed in the image sensor IS.

[0214] The imaging lens system 22 can be configured to have sufficient space to move along the optical axis. Specifically, the imaging lens system 22 can be configured to have a large back focal length (e.g., the distance from the image-side surface of the eighth lens L8 to the imaging plane IP: BFL). For example, the BFL of the imaging lens system 22 can be greater than 1.9 mm and less than 2.8 mm. The BFL of the imaging lens system 22 can be increased or decreased proportionally to the length of the imaging lens system 22. For example, the ratio (BFL / TTL) between the BFL of the imaging lens system 22 and the length of the imaging lens system 22 (TTL: the distance from the object-side surface of the first lens L1 to the imaging plane IP) can be greater than 0.15.

[0215] The BFL of the exemplary imaging lens system 22 can be used to avoid the space between the first lens L1 and the eighth lens L8 in the direction of the imaging plane IP. For example, the first lens L1 to the eighth lens L8 can be moved in the direction of the imaging plane IP by a distance corresponding to the BFL. In the example, the BFL of the imaging lens system 22 can have substantially the same size as the BFLx of the camera module 20. The BFL and BFLx do not necessarily have to be formed to have the same size. For example, when the imaging plane IP is formed in the image sensor IS, the BFL can be larger than the BFLx.

[0216] The exemplary imaging lens system 22 can be configured to achieve high resolution. In the example, the imaging lens system 22 can be configured to form an imaging surface IP with a relatively large size. For example, the height of the imaging surface IP can be from 5.0 mm to 9.0 mm.

[0217] The length variation of the exemplary camera module 20 can be performed by a plurality of lens barrels 24 and 26. In the example, the length CL of the camera module 20 can be changed by driving a second lens barrel 26 housed in a first lens barrel 24 in the optical axis direction.

[0218] The first lens barrel 24 can be configured to receive the second lens barrel 26 and the image sensor IS. Additionally, the first lens barrel 24 can also house a driver for driving the second lens barrel 26. The configuration housed in the first lens barrel 24 is not limited to the second lens barrel 26, the image sensor IS, and the driver.

[0219] The second lens barrel 26 can be disposed on the first lens barrel 24 and configured to receive the imaging lens system 22. The second lens barrel 26 can be configured to move in the optical axis direction. For example, while accommodating the imaging lens system 22, the second lens barrel 26 can move toward the object side or toward the image sensor IS. Depending on the direction of movement of the second lens barrel 26, the second lens barrel 26 can be partially unloaded from the first lens barrel 24 or can be completely loaded into the internal space of the first lens barrel 24. For example, when the second lens barrel 26 moves toward the object side, the second lens barrel 26 can be unloaded to the outside of the first lens barrel 24, and when the second lens barrel 26 moves toward the image sensor IS, the second lens barrel 26 can be loaded into the internal space of the first lens barrel 24.

[0220] A driver (not shown) can be configured to move the second lens barrel 26 in the optical axis direction. For example, the driver can move the second lens barrel 26 in the optical axis direction by means of a drive magnet and a drive coil. The configuration of the driver is not limited to a drive magnet and a drive coil.

[0221] The exemplary camera module 20 configured as described above can achieve high-resolution imaging. For example, the camera module 20 can utilize a large image sensor IS by forming a sufficient distance and space between the imaging lens system 22 and the image sensor IS. Furthermore, the exemplary camera module 20 can be configured to facilitate thinning. For example, the size of the exemplary camera module 20 can be reduced as described above by changing the length CL in the optical axis direction. Therefore, the exemplary camera module 20 according to this embodiment can be easily mounted on small and thin electronic devices.

[0222] In a non-limiting example, an exemplary imaging lens system according to one or more embodiments can be mounted on a thin portable electronic device.

[0223] While this disclosure includes specific examples, it will be apparent to those skilled in the art, upon understanding the disclosure of this application, 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.

[0224] 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 and has a convex object-side surface and a concave image-side surface; The second lens has positive refractive power and has a convex object side and a concave image side; The third lens has negative refractive power and has a convex object side and a concave image side; The fourth lens has positive refractive power and has a convex object-side surface and a concave image-side surface; The fifth lens has a concave object-side surface; The sixth lens has a concave image-side surface; The seventh lens has positive refractive power and a convex object-side surface; as well as The eighth lens has negative refractive power and a convex object-side surface and a concave image-side surface. The first lens to the eighth lens are arranged sequentially from the object side to the imaging side. At least one of the fifth lens and the sixth lens has negative refractive power. The imaging lens system satisfies the following conditional expression: 0.15 < BFL / TTL 3.0 < f4 / f < 7.0 -4.0 < f5 / f < 8.0, and -1.0 < f8 / f < 0, Wherein, BFL is the distance from the image-side surface of the eighth lens to the imaging plane, TTL is the distance from the object-side surface of the first lens to the imaging plane, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f8 is the focal length of the eighth lens, and f is the focal length of the imaging lens system. The imaging lens system has a total of eight lenses.

2. The imaging lens system according to claim 1, wherein, The imaging lens system satisfies the following conditional expression: 0.4 < (TTL-BFL) / 2IMGHT < 0.56, Wherein, 2IMGHT is the diagonal length of the imaging plane.

3. The imaging lens system according to claim 1, wherein, The imaging lens system satisfies the following conditional expression: 0.2 < BFL / f2 < 0.4, Where f2 is the focal length of the second lens.

4. The imaging lens system according to claim 1, wherein, The imaging lens system satisfies the following conditional expression: -0.3 < BFL / f3 < -0.1, Where f3 is the focal length of the third lens.

5. The imaging lens system according to claim 1, wherein, The imaging lens system satisfies the following conditional expression: 0 < f1 / f < 8.0, Where f1 is the focal length of the first lens.

6. The imaging lens system according to claim 1, wherein, The imaging lens system satisfies the following conditional expression: 0 < f² / f < 3.0, Where f2 is the focal length of the second lens.

7. The imaging lens system according to claim 1, wherein, The imaging lens system satisfies the following conditional expression: TTL / f < 1.

5.

8. The imaging lens system according to claim 1, wherein, The imaging lens system satisfies the following conditional expression: BFL / f < 0.

4.

9. The imaging lens system according to claim 1, wherein, The imaging lens system satisfies the following conditional expression: TTL / 2IMGHT < 0.8, Wherein, 2IMGHT is the diagonal length of the imaging plane.

10. An imaging lens system, comprising: The first lens has positive refractive power and has a convex object-side surface and a concave image-side surface; The second lens has positive refractive power and has a convex object side and a concave image side; The third lens has negative refractive power and has a convex object side and a concave image side; The fourth lens has positive refractive power and has a convex object-side surface and a concave image-side surface; The fifth lens has a concave object-side surface; The sixth lens has refractive power, and at least one of its object side and image side is concave; The seventh lens has positive refractive power and a convex object-side surface; as well as The eighth lens has negative refractive power and a convex object-side surface and a concave image-side surface. The first lens to the eighth lens are arranged sequentially from the object side to the imaging side. At least one of the fifth lens and the sixth lens has negative refractive power. The imaging lens system satisfies the following conditional expression: 0.2 < BFL / TTL < 0.35 3.0 < f4 / f < 7.0 -4.0 < f5 / f < 8.0, and -1.0 < f8 / f < 0, Wherein, BFL is the distance from the image-side surface of the eighth lens to the imaging plane, TTL is the distance from the object-side surface of the first lens to the imaging plane, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f8 is the focal length of the eighth lens, and f is the focal length of the imaging lens system. The imaging lens system has a total of eight lenses.

11. The imaging lens system according to claim 10, wherein, The imaging lens system satisfies the following conditional expression: 0.4 < (TTL-BFL) / 2IMGHT < 0.56, Wherein, 2IMGHT is the diagonal length of the imaging plane.

12. The imaging lens system according to claim 10, wherein, The imaging lens system satisfies the following conditional expression: 1.3 < SumT / BFL ​​< 3.0 Wherein, SumT is the sum of the thicknesses of the first lens to the eighth lens.

13. The imaging lens system according to claim 10, wherein, The imaging lens system satisfies the following conditional expression: 0.02 < BFL / f1 < 0.16, Where f1 is the focal length of the first lens.

14. The imaging lens system according to claim 10, wherein, The imaging lens system satisfies the following conditional expression: 0.2 < BFL / f2 < 0.4, Where f2 is the focal length of the second lens.

15. The imaging lens system according to claim 10, wherein, The imaging lens system satisfies the following conditional expression: -0.3 < BFL / f3 < -0.1, Where f3 is the focal length of the third lens.

16. The imaging lens system according to claim 10, wherein, The imaging lens system satisfies the following conditional expression: 0.06 < T1 / IMGHT < 0.10 Where T1 is the thickness of the first lens, and IMGHT is the height of the imaging surface.

17. An electronic device comprising an imaging lens system according to any one of claims 1 to 16.

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