Optical imaging system

Abstract

An optical imaging system is provided. The optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens sequentially arranged from the object side to the image side. The first lens has a positive refractive power, and the second lens has a negative refractive power, and TTL / (2×IMG HT)<0.6, -0.2<SAG52 / TTL<0, and 10<v1-(v6+v7) / 2<30 are satisfied, where TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface, IMG_HT is equal to half of the diagonal length of the imaging surface, SAG52 is the SAG value at the end of the effective aperture of the image side surface of the fifth lens, v1 is the Abbe number of the first lens, v6 is the Abbe number of the sixth lens, and v7 is the Abbe number of the seventh lens.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2021-0102449 filed on August 4, 2021, in the Korean Intellectual Property Office, and Korean Patent Application No. 10-2021-0176896 filed on December 10, 2021, in the Korean Intellectual Property Office, the disclosures of which are incorporated herein by reference in their entirety for all purposes. Technical Field

[0003] The following disclosure relates to optical imaging systems. Background Art

[0004] The portable terminal may include a camera including an optical imaging system having a plurality of lenses to perform operations such as, but not limited to, video calling and image capturing.

[0005] As operations performed by a camera included in a portable terminal gradually increase, there is an increasing demand for a high-resolution camera for the portable terminal.

[0006] Image sensors having a high pixel count (eg, 13 million to 100 million pixels, etc.) may be used in cameras of portable terminals to achieve improved image quality.

[0007] Furthermore, since a portable terminal may be implemented to have a small size, a camera provided in the portable terminal may also be implemented to have a reduced size, and thus, it may be desirable to develop an optical imaging system having a reduced size while achieving high resolution.

[0008] The above information is presented as background information only to assist in gaining an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with respect to the present disclosure. Summary of the invention

[0009] The purpose of providing this summary is to introduce a selection of inventive concepts in a concise form, and these inventive concepts will be further described in the following detailed description. This summary is not intended to identify the key features or essential features of the claimed subject matter, nor is it intended to be used to help determine the scope of the claimed subject matter.

[0010] In general, the optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens sequentially arranged from the object side to the image side, where: the first lens is configured to have a positive refractive power, and the second lens is configured to have a negative refractive power, and TTL / (2×IMG HT)<0.6, -0.2<SAG52 / TTL<0, and 10<v1-(v6+v7) / 2<30 are satisfied, where TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface, IMG HT is equal to half of the diagonal length of the imaging surface, SAG52 is the SAG value at the end of the effective aperture of the image side surface of the fifth lens, v1 is the Abbe number of the first lens, v6 is the Abbe number of the sixth lens, and v7 is the Abbe number of the seventh lens.

[0011] At least one of -0.2<SAG62 / TTL<0, -0.3<SAG72 / TTL<0, and -0.3<SAG82 / TTL<0 can be satisfied, where SAG62 is the SAG value at the end of the effective aperture of the image side surface of the sixth lens, SAG72 is the SAG value at the end of the effective aperture of the image side surface of the seventh lens, and SAG82 is the SAG value at the end of the effective aperture of the image side surface of the eighth lens.

[0012] At least one of 25<v1-v2<45 and 20<v1-v4<45 can be satisfied, where v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, and v4 is the Abbe number of the fourth lens.

[0013] 0<f1 / f<1.4 can be satisfied, where f is the total focal length of the optical imaging system, and f1 is the focal length of the first lens.

[0014] -5<f2 / f<-1 can be satisfied, where f is the total focal length of the optical imaging system, and f2 is the focal length of the second lens.

[0015] 1<f3 / f<7 can be satisfied, where f is the total focal length of the optical imaging system, and f3 is the focal length of the third lens.

[0016] 0.3<|f4 / f| / 10<15 can be satisfied, where f is the total focal length of the optical imaging system, and f4 is the focal length of the fourth lens.

[0017] 0.2<|f5 / f| / 10<5 can be satisfied, where f is the total focal length of the optical imaging system, and f5 is the focal length of the fifth lens.

[0018] 0.5<|f6 / f|<7 can be satisfied, where f is the total focal length of the optical imaging system, and f6 is the focal length of the sixth lens.

[0019] It is possible to satisfy 0 < (f7 / f) / 10 < 5, where f is the total focal length of the optical imaging system and f7 is the focal length of the seventh lens.

[0020] It is possible to satisfy -3 < f8 / f < 0, where f is the total focal length of the optical imaging system and f8 is the focal length of the eighth lens.

[0021] It is possible to satisfy TTL / f < 1.4 and BFL / f < 0.3, where f is the total focal length of the optical imaging system and BFL is the distance on the optical axis from the image side of the eighth lens to the imaging surface.

[0022] It is possible to satisfy D1 / f < 0.1, where D1 is the distance on the optical axis between the image side of the first lens and the object side of the second lens.

[0023] It is possible to satisfy FOV × (IMG HT / f) > 65°, where f is the total focal length of the optical imaging system and FOV is the field of view angle of the optical imaging system.

[0024] The third lens may have a positive refractive power, the fourth lens may have a negative refractive power, the fifth lens may have a positive refractive power, the sixth lens may have a negative refractive power, the seventh lens may have a positive refractive power, and the eighth lens may have a negative refractive power.

[0025] The third lens may have a positive refractive power, the fourth lens may have a positive refractive power, the fifth lens may have a negative refractive power, the sixth lens may have a negative refractive power, the seventh lens may have a positive refractive power, and the eighth lens may have a negative refractive power.

[0026] The third lens may have a positive refractive power, the fourth lens may have a negative refractive power, the fifth lens may have a negative refractive power, the sixth lens may have a positive refractive power, the seventh lens may have a positive refractive power, and the eighth lens may have a negative refractive power.

[0027] Other features and aspects will be apparent from the accompanying drawings, claims, and the following detailed description. Description of the Drawings

[0028] Figure 1 is a diagram showing an exemplary optical imaging system according to a first exemplary embodiment.

[0029] Figure 2 is a diagram showing Figure 1 the aberration characteristics of the exemplary optical imaging system shown in

[0030] Figure 3 is a diagram showing an exemplary optical imaging system according to a second exemplary embodiment.

[0031] Figure 4 It is shown Figure 3 Graphs of aberration characteristics of an example optical imaging system are shown in .

[0032] Figure 5 is a diagram illustrating an example optical imaging system according to a third example embodiment.

[0033] Figure 6 It is shown Figure 5 Graphs of aberration characteristics of an example optical imaging system are shown in .

[0034] Figure 7 is a diagram illustrating an example optical imaging system according to a fourth example embodiment.

[0035] Figure 8 It is shown Figure 7 Graphs of aberration characteristics of an example optical imaging system are shown in .

[0036] Fig. 9 is a diagram illustrating an example optical imaging system according to a fifth example embodiment.

[0037] Fig.10 It is shown Fig. 9 Graphs of aberration characteristics of an example optical imaging system are shown in .

[0038] Fig.11 is a diagram illustrating an example optical imaging system according to a sixth example embodiment.

[0039] Fig.12 It is shown Fig.11 Graphs of aberration characteristics of an example optical imaging system are shown in .

[0040] Fig.13 is a diagram illustrating an example optical imaging system according to a seventh example embodiment.

[0041] Fig.14 It is shown Fig.13 Graphs of aberration characteristics of an example optical imaging system are shown in .

[0042] Fig.15 is a diagram illustrating an example optical imaging system according to an eighth example embodiment.

[0043] Fig.16 It is shown Fig.15 Graphs of aberration characteristics of an example optical imaging system are shown in .

[0044] Fig.17 is a diagram illustrating an example optical imaging system according to a ninth example embodiment.

[0045] Fig.18 It is shown Fig.17Graphs of aberration characteristics of an example optical imaging system are shown in .

[0046] In all drawings and detailed description, the same reference numerals refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative sizes, proportions, and depictions of elements in the drawings may be exaggerated. DETAILED DESCRIPTION

[0047] The following detailed description is provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, except for operations that must occur in a specific order, the order of operations described herein is merely an example and is not limited to the order set forth herein, but changes that will be apparent after understanding the disclosure of the present application may be made. In addition, for greater clarity and brevity, descriptions of features that are known after understanding the disclosure of the present application may be omitted, and it is noted that omitting features and their descriptions is not intended to be recognized as common sense.

[0048] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein are provided merely to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein, which will be apparent after understanding the disclosure of this application.

[0049] Herein, it should be noted that the use of the term “may” for an embodiment or example, for example, for what an embodiment or example may include or implement, means that there is at least one embodiment or example that includes or implements such feature, and all embodiments and examples are not limited thereto.

[0050] Throughout the specification, when an element such as a layer, region, or substrate is described as being "on," "connected to," or "coupled to" another element, it may be directly "on," "connected to," or "coupled to" the other element, or one or more other elements may be interposed. Conversely, when an element is described as being "directly on," "directly connected to," or "directly coupled to" another element, no other elements may be interposed.

[0051] As used herein, the term "and / or" includes any one and any combination of any two or more of the associated listed items.

[0052] Although terms such as "first", "second" and "third" may be used herein to describe various members, components, regions, layers or portions, these members, components, regions, layers or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer or portion from another member, component, region, layer or portion. Therefore, without departing from the teachings of the examples described herein, the first member, first component, first region, first layer or first portion mentioned in the examples may also be referred to as the second member, second component, second region, second layer or second portion.

[0053] Spatially relative terms such as "above", "higher", "below", and "lower" may be used herein for descriptive convenience to describe the relationship of one element relative to another element as shown in the accompanying drawings. In addition to covering the orientations depicted in the accompanying drawings, these spatially relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the accompanying drawings is flipped, an element described as being "above" or "higher" relative to another element will be "below" or "lower" relative to the other element. Therefore, depending on the spatial orientation of the device, the term "above" covers both "above" and "below" orientations. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.

[0054] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the articles "a", "an" and "the" are intended to include plural forms as well. The terms "include", "comprise" and "have" illustrate the presence of stated features, numbers, operations, components, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, numbers, operations, components, elements and / or combinations thereof.

[0055] Due to manufacturing techniques and / or tolerances, the shapes shown in the drawings may vary. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include shape variations that occur during manufacturing.

[0056] It will be apparent after obtaining an understanding of the disclosure of the present application that the features of the examples described herein can be combined in various ways. In addition, although the examples described herein have multiple configurations, it will be apparent after obtaining an understanding of the disclosure of the present application that other configurations are also possible.

[0057] For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative sizes, proportions, and depictions of elements in the drawings may be exaggerated.

[0058] Hereinafter, examples of the present disclosure will be described with reference to the accompanying drawings as follows.

[0059] One aspect of one or more examples may provide an optical imaging system that can achieve high resolution and can have a reduced overall length.

[0060] In the lens diagrams, the thickness, size, and shape of the lenses are exaggerated, and specifically, the shapes of spherical or aspherical surfaces presented in the lens diagrams are merely examples and are not limited thereto.

[0061] The first lens refers to a lens closest to the object side, and the eighth lens refers to a lens closest to the imaging surface (or image sensor).

[0062] The first surface of each lens refers to the surface adjacent to the object side (or object side surface), and the second surface of each lens refers to the surface adjacent to the image side (or image side surface). In one or more examples, all values ​​of the radius of curvature, thickness, distance, focal length, etc. of the lens are expressed in millimeters (mm), and the field of view (FOV) is expressed in degrees.

[0063] In the description of the shape in each lens, disclosing that one surface of a lens is convex means that the paraxial region portion of the corresponding surface is convex, disclosing that one surface of a lens is concave means that the paraxial region portion of the corresponding surface is concave, and disclosing that one surface of a lens is flat means that the paraxial region portion of the corresponding surface is flat. Therefore, even in an example where one surface of a lens is described as convex, an edge portion or region of the lens may be concave. Similarly, even in an example where one surface of a lens is described as concave, an edge portion or region of the lens may be convex. Furthermore, even in an example where one surface of a lens is described as flat, an edge portion or region of the lens may be convex or concave.

[0064] The paraxial region refers to a significantly narrow region adjacent to the optical axis.

[0065] The imaging plane may refer to a virtual plane on which a focused image is formed by an optical imaging system. Alternatively, the imaging plane may refer to a surface of an image sensor on which light is received.

[0066] The optical imaging system in an example embodiment may include eight lenses.

[0067] In an example, the optical imaging system in the example embodiment 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 in order from the object side to the image side. The first lens to the eighth lens may be spaced apart from each other by a predetermined distance along the optical axis.

[0068] However, the optical imaging system in the example embodiment is not limited to including only eight lenses, but may further include other components as necessary.

[0069] For example, the optical imaging system may also include an image sensor that converts an image of an object incident thereon into an electrical signal.

[0070] In addition, the optical imaging system may further include an infrared filter (hereinafter referred to as a “filter”) for blocking infrared light. The filter may be disposed between the eighth lens and the image sensor.

[0071] In addition, the optical imaging system may further include an aperture for adjusting the amount of light.

[0072] In a non-limiting example, the first to eighth lenses included in the example optical imaging system may be made of a plastic material.

[0073] At least one of the first to eighth lenses may have an aspherical surface. Each of the first to eighth lenses may have at least one aspherical surface.

[0074] That is, at least one of the first surface and the second surface of each of the first to eighth lenses may be an aspherical surface. The aspherical surface of each of the first to eighth lenses is represented as follows:

[0075] Equation 1:

[0076]

[0077] In Equation 1, c is the curvature of the lens (the inverse of the radius of curvature), K is the conic constant, and Y is the distance from a point on the aspherical surface of the lens to the optical axis. In addition, constants A to P are aspherical coefficients, and Z (SAG) is the distance in the optical axis direction from a point on the aspherical surface of the lens to the vertex of the aspherical surface. SAG refers to convex curvature or concave curvature, and represents the physical distance between the vertex (highest point or lowest point) along the curve and the center point of a line drawn perpendicular to the optical axis from one edge to the other edge of the optical lens.

[0078] The optical imaging system in the example implementation may satisfy at least one of the following conditional expressions:

[0079] Conditional expression 1:0 <f1 / f<1.4

[0080] Conditional Expression 2:25 <v1-v2<45

[0081] Conditional Expression 3:20 <v1-v4<45

[0082] Conditional Expression 4:10 <v1-(v6+v7) / 2<30

[0083] Conditional expression 5: -5 <f2 / f<-1

[0084] Conditional Expression 6:1 <f3 / f<7

[0085] Conditional expression 7: 0.3<|f4 / f| / 10<15

[0086] Conditional expression 8: 0.2<|f5 / f| / 10<5

[0087] Conditional expression 9: 0.5<|f6 / f|<7

[0088] Conditional expression 10:0<(f7 / f) / 10<5

[0089] Conditional expression 11: -3 <f8 / f<0

[0090] Conditional expression 12: TTL / f<1.4

[0091] Conditional expression 13: f1 / f2<0

[0092] Conditional expression 14: f1 / f3>0

[0093] Conditional expression 15: BFL / f<0.3

[0094] Conditional Expression 16: D1 / f<0.1

[0095] Conditional Expression 17: TTL / (2×IMG HT)<0.6

[0096] Conditional Expression 18: FOV×(IMG HT / f)>65°

[0097] Conditional expression 19: -0.2 <SAG52 / TTL<0

[0098] Conditional expression 20: -0.2 <SAG62 / TTL<0

[0099] Conditional expression 21: -0.3 <SAG72 / TTL<0

[0100] Conditional expression 22: -0.3 <SAG82 / TTL<0

[0101] In the conditional expression, f is the total focal length of the optical imaging 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, and f8 is the focal length of the eighth lens.

[0102] In the conditional expression, v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, v4 is the Abbe number of the fourth lens, v6 is the Abbe number of the sixth lens, and v7 is the Abbe number of the seventh lens.

[0103] In the conditional expressions, TTL is the distance on the optical axis from the object-side surface of the first lens to the imaging surface, and BFL is the distance on the optical axis from the image-side surface of the eighth lens to the imaging surface.

[0104] In the conditional expression, D1 is the distance between the image side surface of the first lens and the object side surface of the second lens on the optical axis, IMG HT is equal to half the diagonal length of the imaging surface, and FOV is the field angle of the optical imaging system.

[0105] In the conditional expressions, SAG52 is the SAG value at the end of the effective aperture of the object side surface of the fifth lens, SAG62 is the SAG value at the end of the effective aperture of the object side surface of the sixth lens, SAG72 is the SAG value at the end of the effective aperture of the object side surface of the seventh lens, and SAG82 is the SAG value at the end of the effective aperture of the object side surface of the eighth lens.

[0106] When the SAG value is negative, it means that the end of the effective aperture of the corresponding lens surface is disposed closer to the object side than the vertex of the corresponding lens surface.

[0107] When the SAG value is positive, it means that the end of the effective aperture of the corresponding lens surface is disposed closer to the image side than the vertex of the corresponding lens surface.

[0108] The first to eighth lenses included in the optical imaging system in the example embodiment will be described.

[0109] The first lens may have positive refractive power. In addition, the first lens may have a meniscus shape with its object side surface convex. In addition, the first surface of the first lens may be convex, and the second surface of the first lens may be concave.

[0110] At least one of the first surface and the second surface of the first lens may be aspherical. In an example, both surfaces of the first lens may be aspherical.

[0111] The second lens may have negative refractive power. In addition, the second lens may have a meniscus shape with its object side surface convex. In addition, the first surface of the second lens may be convex, and the second surface of the second lens may be concave.

[0112] At least one of the first surface of the second lens and the second surface of the second lens may be aspherical. In an example, both surfaces of the second lens may be aspherical.

[0113] The third lens may have positive refractive power. In addition, the third lens may have a shape in which both surfaces may be convex. In addition, the first surface of the third lens and the second surface of the third lens may be convex.

[0114] Alternatively, the third lens may have a meniscus shape whose object side surface is convex. In addition, a first surface of the third lens may be convex, and a second surface of the third lens may be concave.

[0115] At least one of the first surface and the second surface of the third lens may be aspherical. In an example, both surfaces of the third lens may be aspherical.

[0116] The fourth lens may have positive refractive power or negative refractive power. In addition, the fourth lens may have a meniscus shape with its object side surface being convex. In addition, the first surface of the fourth lens may be convex, and the second surface of the fourth lens may be concave.

[0117] Alternatively, the fourth lens may have a meniscus shape with its image side surface being convex. In addition, a first surface of the fourth lens may be concave, and a second surface of the fourth lens may be convex.

[0118] At least one of the first surface and the second surface of the fourth lens may be aspherical. In an example, both surfaces of the fourth lens may be aspherical.

[0119] The fifth lens may have positive refractive power or negative refractive power. Moreover, the fifth lens may have a meniscus shape with its image side surface convex. In addition, the first surface of the fifth lens may be concave, and the second surface of the fifth lens may be convex.

[0120] Alternatively, the fifth lens may have a meniscus shape with its object side surface being convex. In addition, the first surface of the fifth lens may be convex in the paraxial region, and the second surface of the fifth lens may be concave in the paraxial region.

[0121] At least one of the first surface and the second surface of the fifth lens may be aspherical. In an example, both surfaces of the fifth lens may be aspherical.

[0122] The sixth lens may have positive refractive power or negative refractive power. In addition, the sixth lens may have a meniscus shape with its object side convex. In addition, the first surface of the sixth lens may be convex in the paraxial region, and the second surface of the sixth lens may be concave in the paraxial region.

[0123] The sixth lens may have a shape in which both sides thereof may be convex. In addition, the first surface and the second surface of the sixth lens may be convex in the paraxial region.

[0124] At least one of the first surface and the second surface of the sixth lens may be aspherical. In an example, both surfaces of the sixth lens may be aspherical.

[0125] At least one inflection point may be formed on at least one of the first surface and the second surface of the sixth lens. In an example, the first surface of the sixth lens may be convex in the paraxial region and concave in a portion other than the paraxial region. The second surface of the sixth lens may be concave in the paraxial region and convex in a portion other than the paraxial region.

[0126] The seventh lens may have positive refractive power. In addition, the seventh lens may have a shape in which both surfaces may be convex. In addition, the first surface and the second surface of the seventh lens may be convex.

[0127] Alternatively, the seventh lens may have a meniscus shape with its image-side surface being convex. In addition, the first surface of the seventh lens may be concave in the paraxial region, and the second surface of the seventh lens may be convex in the paraxial region.

[0128] At least one of the first surface and the second surface of the seventh lens may be aspherical. In an example, both surfaces of the seventh lens may be aspherical.

[0129] In addition, at least one inflection point may be formed on at least one of the first surface and the second surface of the seventh lens. In an example, the first surface of the seventh lens may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the seventh lens may be convex in the paraxial region and concave in a portion or region other than the paraxial region.

[0130] The eighth lens may have negative refractive power. In addition, the eighth lens may have a meniscus shape with its object side surface being convex. In addition, the first surface of the eighth lens may be convex in the paraxial region, and the second surface of the eighth lens may be concave in the paraxial region.

[0131] At least one of the first surface and the second surface of the eighth lens may be aspherical. In an example, both surfaces of the eighth lens may be aspherical.

[0132] In addition, at least one inflection point may be formed on at least one of the first surface and the second surface of the eighth lens. In an example, the first surface of the eighth lens may be convex in the paraxial region and concave in a portion other than the paraxial region. The second surface of the eighth lens may be concave in the paraxial region and convex in a portion or region other than the paraxial region.

[0133] Each of the first to eighth lenses may be made of a plastic material having optical characteristics different from those of adjacent lenses.

[0134] Among the first to eighth lenses, at least three lenses may have a refractive index greater than 1.61. As an example, the refractive index of each of the second lens, the fourth lens, and the sixth lens may be greater than 1.61. Alternatively, the refractive index of each of the second lens, the fourth lens, and the seventh lens may be greater than 1.61.

[0135] Will refer to Figure 1 and Figure 2 An optical imaging system according to a first example embodiment is described.

[0136] The example optical imaging system 100 in the first example embodiment may include an optical system, and may also include a filter 190 and an image sensor IS, wherein the optical system includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, a seventh lens 170 and an eighth lens 180.

[0137] The example optical imaging system 100 in the first example embodiment may form a focused image on an imaging surface 191. The imaging surface 191 may refer to a surface on which a focused image is formed by the optical imaging system. As an example, the imaging surface 191 may refer to one surface of the image sensor IS on which light is received.

[0138] The lens characteristics (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number, and focal length) of each lens are listed in Table 1 below.

[0139] Table 1

[0140]

[0141]

[0142] In the example optical imaging system of the first example embodiment, the total focal length f may be 4.53 mm, IMG HT may be 5.107 mm, FOV may be 94°, SAG52 may be -0.4555 mm, SAG62 may be -0.4884 mm, SAG72 may be -0.7403 mm, and SAG82 may be -1.1111 mm.

[0143] In the first example embodiment, the first lens 110 may have positive refractive power, a first surface of the first lens 110 may be convex, and a second surface of the first lens 110 may be concave.

[0144] The second lens 120 may have negative refractive power, a first surface of the second lens 120 may be convex, and a second surface of the second lens 120 may be concave.

[0145] The third lens 130 may have positive refractive power, and a first surface of the third lens 130 may be convex, and a second surface of the third lens 130 may be convex.

[0146] The fourth lens 140 may have negative refractive power, a first surface of the fourth lens 140 may be convex, and a second surface of the fourth lens 140 may be concave.

[0147] The fifth lens 150 may have positive refractive power, a first surface of the fifth lens 150 may be concave, and a second surface of the fifth lens 150 may be convex.

[0148] The sixth lens 160 may have negative refractive power, a first surface of the sixth lens 160 may be convex in the paraxial region, and a second surface of the sixth lens 160 may be concave in the paraxial region.

[0149] At least one inflection point may be formed on at least one of the first surface and the second surface of the sixth lens 160. In an example, the first surface of the sixth lens 160 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the sixth lens 160 may be concave in the paraxial region and convex in a portion or region other than the paraxial region.

[0150] The seventh lens 170 may have positive refractive power, and a first surface of the seventh lens 170 may be convex in the paraxial region, and a second surface of the seventh lens 170 may be convex in the paraxial region.

[0151] At least one inflection point may be formed on at least one of the first surface and the second surface of the seventh lens 170. In an example, the first surface of the seventh lens 170 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the seventh lens 170 may be convex in the paraxial region and concave in a portion or region other than the paraxial region.

[0152] The eighth lens 180 may have negative refractive power, a first surface of the eighth lens 180 may be convex in the paraxial region, and a second surface of the eighth lens 180 may be concave in the paraxial region.

[0153] At least one inflection point may be formed on at least one of the first surface and the second surface of the eighth lens 180. In an example, the first surface of the eighth lens 180 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the eighth lens 180 may be concave in the paraxial region and convex in a portion or region other than the paraxial region.

[0154] Each surface of the first to eighth lenses 110 to 180 may have an aspherical coefficient as shown in the following Table 2. In an example, both the object-side surface and the image-side surface of the first to eighth lenses 110 to 180 may be aspherical.

[0155] Table 2

[0156]

[0157]

[0158] The optical imaging system configured as above may have Figure 2 Aberration characteristics shown in .

[0159] Will refer to Figure 3 and Figure 4 An example optical imaging system according to a second example embodiment is described.

[0160] The example optical imaging system 200 in the second example embodiment may include an optical system, and may also include a filter 290 and an image sensor IS, wherein the optical system includes a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, a sixth lens 260, a seventh lens 270 and an eighth lens 280.

[0161] The example optical imaging system 200 in the second example embodiment may form a focused image on an imaging surface 291. The imaging surface 291 may refer to a surface on which a focused image is formed by the optical imaging system. In an example, the imaging surface 291 may refer to one surface of the image sensor IS on which light is received.

[0162] The lens characteristics (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number, and focal length) of each lens are listed in Table 3 below.

[0163] Table 3

[0164]

[0165]

[0166] In the example optical imaging system 200 in the second example embodiment, the total focal length may be 4.53 mm, IMG HT may be 5.107 mm, FOV may be 94°, SAG52 may be -0.4005 mm, SAG62 may be -0.5198 mm, SAG72 may be -0.83 mm, and SAG82 may be -1.03 mm.

[0167] In the second example embodiment, the first lens 210 may have positive refractive power, a first surface of the first lens 210 may be convex, and a second surface of the first lens 210 may be concave.

[0168] The second lens 220 may have negative refractive power, a first surface of the second lens 220 may be convex, and a second surface of the second lens 220 may be concave.

[0169] The third lens 230 may have positive refractive power, a first surface of the third lens 230 may be convex, and a second surface of the third lens 230 may be concave.

[0170] The fourth lens 240 may have negative refractive power, a first surface of the fourth lens 240 may be convex, and a second surface of the fourth lens 240 may be concave.

[0171] The fifth lens 250 may have positive refractive power, a first surface of the fifth lens 250 may be concave, and a second surface of the fifth lens 250 may be convex.

[0172] The sixth lens 260 may have negative refractive power, a first surface of the sixth lens 260 may be convex in the paraxial region, and a second surface of the sixth lens 260 may be concave in the paraxial region.

[0173] At least one inflection point may be formed on at least one of the first surface and the second surface of the sixth lens 260. In an example, the first surface of the sixth lens 260 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the sixth lens 260 may be concave in the paraxial region and convex in a portion or region other than the paraxial region.

[0174] The seventh lens 270 may have positive refractive power, and a first surface of the seventh lens 270 may be convex in the paraxial region, and a second surface of the seventh lens 270 may be convex in the paraxial region.

[0175] At least one inflection point may be formed on at least one of the first surface and the second surface of the seventh lens 270. In an example, the first surface of the seventh lens 270 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the seventh lens 270 may be convex in the paraxial region and concave in a portion or region other than the paraxial region.

[0176] The eighth lens 280 may have negative refractive power, a first surface of the eighth lens 280 may be convex in the paraxial region, and a second surface of the eighth lens 280 may be concave in the paraxial region.

[0177] At least one inflection point may be formed on at least one of the first surface and the second surface of the eighth lens 280. In an example, the first surface of the eighth lens 280 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the eighth lens 280 may be concave in the paraxial region and convex in a portion or region other than the paraxial region.

[0178] Each surface of the first to eighth lenses 210 to 280 may have an aspherical coefficient as shown in the following Table 4. In an example, both the object-side surface and the image-side surface of the first to eighth lenses 210 to 280 may be aspherical.

[0179] Table 4

[0180]

[0181]

[0182] The optical imaging system configured as above may have Figure 4 Aberration characteristics shown in .

[0183] Will refer to Figure 5 and Figure 6 An example optical imaging system in a third example embodiment is described.

[0184] The example optical imaging system 300 in the third example embodiment may include an optical system, and may also include a filter 390 and an image sensor IS, wherein the optical system includes a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, a sixth lens 360, a seventh lens 370 and an eighth lens 380.

[0185] The example optical imaging system 300 in the third example embodiment may form a focused image on an imaging surface 391. The imaging surface 391 may refer to a surface on which a focused image is formed by the optical imaging system. In an example, the imaging surface 391 may refer to one surface of the image sensor IS on which light is received.

[0186] The lens characteristics (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number, and focal length) of each lens are listed in Table 5 below.

[0187] Table 5

[0188]

[0189]

[0190] In the example optical imaging system in the third example embodiment, the total focal length f may be 4.55 mm, IMG HT may be 5.107 mm, FOV may be 94°, SAG52 may be -0.3826 mm, SAG62 may be -0.525 mm, SAG72 may be -0.8746 mm, and SAG82 may be -1.0396 mm.

[0191] In the third example embodiment, the first lens 310 may have positive refractive power, a first surface of the first lens 310 may be convex, and a second surface of the first lens 310 may be concave.

[0192] The second lens 320 may have negative refractive power, a first surface of the second lens 320 may be convex, and a second surface of the second lens 320 may be concave.

[0193] The third lens 330 may have positive refractive power, a first surface of the third lens 330 may be convex, and a second surface of the third lens 330 may be concave.

[0194] The fourth lens 340 may have negative refractive power, a first surface of the fourth lens 340 may be convex, and a second surface of the fourth lens 340 may be concave.

[0195] The fifth lens 350 may have positive refractive power, a first surface of the fifth lens 350 may be concave, and a second surface of the fifth lens 350 may be convex.

[0196] The sixth lens 360 may have negative refractive power, a first surface of the sixth lens 360 may be convex, and a second surface of the sixth lens 360 may be concave in a paraxial region.

[0197] At least one inflection point may be formed on at least one of the first surface of the sixth lens 360 and the second surface of the sixth lens 360. In an example, the first surface of the sixth lens 360 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the sixth lens 360 may be concave in the paraxial region and convex in a portion or region other than the paraxial region.

[0198] The seventh lens 370 may have positive refractive power, and a first surface of the seventh lens 370 may be convex in the paraxial region, and a second surface of the seventh lens 370 may be convex in the paraxial region.

[0199] At least one inflection point may be formed on at least one of the first surface and the second surface of the seventh lens 370. In an example, the first surface of the seventh lens 370 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the seventh lens 370 may be convex in the paraxial region and concave in a portion or region other than the paraxial region.

[0200] Each surface of the first to eighth lenses 310 to 380 may have an aspherical coefficient as shown in the following Table 6. In an example, both the object-side surface and the image-side surface of the first to eighth lenses 310 to 380 may be aspherical.

[0201] Table 6

[0202]

[0203]

[0204] The optical imaging system configured as above may have the following features: Figure 6 Aberration characteristics shown in .

[0205] Will refer to Figure 7 and Figure 8 An example optical imaging system according to a fourth example embodiment is described.

[0206] The example optical imaging system 400 in the fourth example embodiment may include an optical system, and may also include a filter 490 and an image sensor IS, wherein the optical system includes a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, a sixth lens 460, a seventh lens 470 and an eighth lens 480.

[0207] The optical imaging system 400 in the fourth example embodiment may form a focused image on an imaging surface 491. The imaging surface 491 may refer to a surface on which a focused image is formed by the optical imaging system. In an example, the imaging surface 491 may refer to one surface of the image sensor IS on which light is received.

[0208] The lens characteristics (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number and focal length) of each lens are listed in Table 7 below.

[0209] Table 7

[0210]

[0211]

[0212] In the example optical imaging system of the fourth example embodiment, the total focal length f may be 4.56 mm, IMG HT may be 5.107 mm, FOV may be 94°, SAG52 may be -0.3654 mm, SAG62 may be -0.4809 mm, SAG72 may be -0.92 mm, and SAG82 may be -1.0601 mm.

[0213] In the fourth example embodiment, the first lens 410 may have positive refractive power, a first surface of the first lens 410 may be convex, and a second surface of the first lens 410 may be concave.

[0214] The second lens 420 may have negative refractive power, a first surface of the second lens 420 may be convex, and a second surface of the second lens 420 may be concave.

[0215] The third lens 430 may have positive refractive power, a first surface of the third lens 430 may be convex, and a second surface of the third lens 430 may be concave.

[0216] The fourth lens 440 may have positive refractive power, a first surface of the fourth lens 440 may be convex, and a second surface of the fourth lens 440 may be concave.

[0217] The fifth lens 450 may have negative refractive power, a first surface of the fifth lens 450 may be concave, and a second surface of the fifth lens 450 may be convex.

[0218] The sixth lens 460 may have negative refractive power, a first surface of the sixth lens 460 may be convex in the paraxial region, and a second surface of the sixth lens 460 may be concave in the paraxial region.

[0219] At least one inflection point is formed on at least one of the first surface and the second surface of the sixth lens 460. In an example, the first surface of the sixth lens 460 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the sixth lens 460 may be concave in the paraxial region and convex in a portion or region other than the paraxial region.

[0220] The seventh lens 470 may have positive refractive power, and a first surface of the seventh lens 470 may be convex in the paraxial region, and a second surface of the seventh lens 470 may be convex in the paraxial region.

[0221] At least one inflection point may be formed on at least one of the first surface and the second surface of the seventh lens 470. In an example, the first surface of the seventh lens 470 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the seventh lens 470 may be convex in the paraxial region and concave in a portion or region other than the paraxial region.

[0222] The eighth lens 480 may have negative refractive power, a first surface of the eighth lens 480 may be convex in the paraxial region, and a second surface of the eighth lens 480 may be concave in the paraxial region.

[0223] At least one inflection point may be formed on at least one of the first surface and the second surface of the eighth lens 480. In an example, the first surface of the eighth lens 480 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the eighth lens 480 may be concave in the paraxial region and convex in a portion or region other than the paraxial region.

[0224] Each surface of the first to eighth lenses 410 to 480 may have an aspherical coefficient as shown in the following Table 8. In an example, both the object-side surface and the image-side surface of the first to eighth lenses 410 to 480 may be aspherical.

[0225] Table 8

[0226]

[0227]

[0228] The optical imaging system configured as above may have Figure 8 Aberration characteristics shown in .

[0229] Will refer to Fig. 9 and Fig.10 An example optical imaging system according to a fifth example embodiment is described.

[0230] The example optical imaging system 500 in the fifth example embodiment may include an optical system, and may also include a filter 590 and an image sensor IS, wherein the optical system includes a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, a sixth lens 560, a seventh lens 570 and an eighth lens 580.

[0231] The example optical imaging system 500 in the fifth example embodiment may form a focused image on an imaging surface 591. The imaging surface 591 may refer to a surface on which a focused image is formed by the optical imaging system. In an example, the imaging surface 591 may refer to one surface of the image sensor IS on which light is received.

[0232] The lens characteristics (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number, and focal length) of each lens are listed in Table 9 below.

[0233] Table 9

[0234]

[0235]

[0236] In the example optical imaging system 500 in the fifth example embodiment, the total focal length f can be 4.54 mm, IMGHT can be 5.107 mm, FOV can be 93.3°, SAG52 can be -0.552 mm, SAG62 can be -0.7887 mm, SAG72 can be -0.8231 mm, and SAG82 can be -0.9454 mm.

[0237] In the fifth example embodiment, the first lens 510 may have positive refractive power, a first surface of the first lens 510 may be convex, and a second surface of the first lens 510 may be concave.

[0238] The second lens 520 may have negative refractive power, a first surface of the second lens 520 may be convex, and a second surface of the second lens 520 may be concave.

[0239] The third lens 530 may have positive refractive power, and a first surface of the third lens 530 may be convex, and a second surface of the third lens 530 may be convex.

[0240] The fourth lens 540 may have negative refractive power, a first surface of the fourth lens 540 may be concave, and a second surface of the fourth lens 540 may be convex.

[0241] The fifth lens 550 may have negative refractive power, a first surface of the fifth lens 550 may be convex, and a second surface of the fifth lens 550 may be concave.

[0242] The sixth lens 560 may have positive refractive power, and a first surface of the sixth lens 560 may be convex in the paraxial region, and a second surface of the sixth lens 560 may be convex in the paraxial region.

[0243] At least one inflection point may be formed on at least one of the first surface and the second surface of the sixth lens 560. In an example, the first surface of the sixth lens 560 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the sixth lens 560 may be convex in the paraxial region and concave in a portion or region other than the paraxial region.

[0244] The seventh lens 570 may have positive refractive power, and a first surface of the seventh lens 570 may be concave in the paraxial region, and a second surface of the seventh lens 570 may be convex in the paraxial region.

[0245] At least one inflection point may be formed on at least one of the first surface and the second surface of the seventh lens 570. In an example, the first surface of the seventh lens 570 may be concave in the paraxial region and convex in a portion or region other than the paraxial region. The second surface of the seventh lens 570 may be convex in the paraxial region and concave in a portion or region other than the paraxial region.

[0246] The eighth lens 580 may have negative refractive power, a first surface of the eighth lens 580 may be convex in the paraxial region, and a second surface of the eighth lens 580 may be concave in the paraxial region.

[0247] At least one inflection point may be formed on at least one of the first surface and the second surface of the eighth lens 580. In an example, the first surface of the eighth lens 580 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the eighth lens 580 may be concave in the paraxial region and convex in a portion or region other than the paraxial region.

[0248] Each surface of the first to eighth lenses 510 to 580 may have an aspherical coefficient as shown in the following Table 10. In an example, both the object-side surface and the image-side surface of the first to eighth lenses 510 to 580 may be aspherical.

[0249] Table 10

[0250]

[0251]

[0252] The optical imaging system configured as above may have the following features: Fig.10 Aberration characteristics shown in .

[0253] Will refer to Fig.11 and Fig.12 An example optical imaging system according to a sixth example embodiment is described.

[0254] The example optical imaging system 600 in the sixth example embodiment may include an optical system, and may also include a filter 690 and an image sensor IS, wherein the optical system includes a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, a fifth lens 650, a sixth lens 660, a seventh lens 670 and an eighth lens 680.

[0255] The optical imaging system 600 in the sixth example embodiment may form a focused image on an imaging surface 691. The imaging surface 691 may refer to a surface on which a focused image is formed by the optical imaging system. In an example, the imaging surface 691 may refer to one surface of the image sensor IS on which light is received.

[0256] The lens characteristics (curvature radius, thickness of the lens or distance between lenses, refractive index, Abbe number and focal length) of each lens are listed in Table 11 below.

[0257] Table 11

[0258]

[0259]

[0260] In the example optical imaging system according to the sixth example embodiment, the total focal length f may be 4.5 mm, IMG HT may be 5.107 mm, FOV may be 93.8°, SAG52 may be -0.5225 mm, SAG62 may be -0.7846 mm, SAG72 may be -0.909 mm, and SAG82 may be -0.8748 mm.

[0261] In the sixth example embodiment, the first lens 610 may have positive refractive power, a first surface of the first lens 610 may be convex, and a second surface of the first lens 610 may be concave.

[0262] The second lens 620 may have negative refractive power, a first surface of the second lens 620 may be convex, and a second surface of the second lens 620 may be concave.

[0263] The third lens 630 may have positive refractive power, and a first surface of the third lens 630 may be convex, and a second surface of the third lens 630 may be convex.

[0264] The fourth lens 640 may have negative refractive power, a first surface of the fourth lens 640 may be concave, and a second surface of the fourth lens 640 may be convex.

[0265] The fifth lens 650 may have negative refractive power, a first surface of the fifth lens 650 may be convex, and a second surface of the fifth lens 650 may be concave.

[0266] The sixth lens 660 may have positive refractive power, and a first surface of the sixth lens 660 may be convex in the paraxial region, and a second surface of the sixth lens 660 may be convex in the paraxial region.

[0267] At least one inflection point may be formed on at least one of the first surface and the second surface of the sixth lens 660. In an example, the first surface of the sixth lens 660 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the sixth lens 660 may be convex in the paraxial region and concave in a portion or region other than the paraxial region.

[0268] The seventh lens 670 may have positive refractive power, a first surface of the seventh lens 670 may be concave in the paraxial region, and a second surface of the seventh lens 670 may be convex in the paraxial region.

[0269] At least one inflection point may be formed on at least one of the first surface and the second surface of the seventh lens 670. In an example, the first surface of the seventh lens 670 may be concave in the paraxial region and convex in a portion or region other than the paraxial region. The second surface of the seventh lens 670 may be convex in the paraxial region and concave in a portion or region other than the paraxial region.

[0270] The eighth lens 680 may have negative refractive power, a first surface of the eighth lens 680 may be convex in the paraxial region, and a second surface of the eighth lens 680 may be concave in the paraxial region.

[0271] At least one inflection point may be formed on at least one of the first surface and the second surface of the eighth lens 680. In an example, the first surface of the eighth lens 680 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the eighth lens 680 may be concave in the paraxial region and convex in a portion or region other than the paraxial region.

[0272] Each surface of the first to eighth lenses 610 to 680 may have an aspherical coefficient as shown in the following Table 12. In an example, both the object-side surface and the image-side surface of the first to eighth lenses 610 to 680 may be aspherical.

[0273] Table 12

[0274]

[0275]

[0276] The optical imaging system configured as above may have the following features: Fig.12 Aberration characteristics shown in .

[0277] Will refer to Fig.13 and Fig.14 An example optical imaging system according to a seventh example embodiment is described.

[0278] The example optical imaging system 700 in the seventh example embodiment may include an optical system, and may also include a filter 790 and an image sensor IS, wherein the optical system includes a first lens 710, a second lens 720, a third lens 730, a fourth lens 740, a fifth lens 750, a sixth lens 760, a seventh lens 770 and an eighth lens 780.

[0279] The example optical imaging system 700 in the seventh example embodiment may form a focused image on an imaging surface 791. The imaging surface 791 may refer to a surface on which a focused image is formed by the optical imaging system. In an example, the imaging surface 791 may refer to one surface of the image sensor IS on which light is received.

[0280] The lens characteristics (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number and focal length) of each lens are listed in Table 13 below.

[0281] Table 13

[0282]

[0283]

[0284] In the example optical imaging system 700 in the seventh example embodiment, the total focal length f can be 4.48 mm, IMGHT can be 5.107 mm, FOV can be 94°, SAG52 can be -0.5241 mm, SAG62 can be -0.768 mm, SAG72 can be -0.9193 mm, and SAG82 can be -0.8972 mm.

[0285] In the seventh example embodiment, the first lens 710 may have positive refractive power, a first surface of the first lens 710 may be convex, and a second surface of the first lens 710 may be concave.

[0286] The second lens 720 may have negative refractive power, a first surface of the second lens 720 may be convex, and a second surface of the second lens 720 may be concave.

[0287] The third lens 730 may have positive refractive power, and a first surface of the third lens 730 may be convex, and a second surface of the third lens 730 may be convex.

[0288] The fourth lens 740 may have negative refractive power, a first surface of the fourth lens 740 may be concave, and a second surface of the fourth lens 740 may be convex.

[0289] The fifth lens 750 may have negative refractive power, a first surface of the fifth lens 750 may be convex, and a second surface of the fifth lens 750 may be concave.

[0290] The sixth lens 760 may have positive refractive power, and a first surface of the sixth lens 760 may be convex in the paraxial region, and a second surface of the sixth lens 760 may be convex in the paraxial region.

[0291] At least one inflection point may be formed on at least one of the first surface and the second surface of the sixth lens 760. In an example, the first surface of the sixth lens 760 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the sixth lens 760 may be convex in the paraxial region and concave in a portion or region other than the paraxial region.

[0292] The seventh lens 770 may have positive refractive power, and a first surface of the seventh lens 770 may be concave in the paraxial region, and a second surface of the seventh lens 770 may be convex in the paraxial region.

[0293] At least one inflection point may be formed on at least one of the first surface and the second surface of the seventh lens 770. In an example, the first surface of the seventh lens 770 may be concave in the paraxial region and convex in a portion or region other than the paraxial region. The second surface of the seventh lens 770 may be convex in the paraxial region and concave in a portion or region other than the paraxial region.

[0294] The eighth lens 780 may have negative refractive power, a first surface of the eighth lens 780 may be convex in the paraxial region, and a second surface of the eighth lens 780 may be concave in the paraxial region.

[0295] At least one inflection point may be formed on at least one of the first surface and the second surface of the eighth lens 780. In an example, the first surface of the eighth lens 780 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the eighth lens 780 may be concave in the paraxial region and convex in a portion or region other than the paraxial region.

[0296] Each surface of the first to eighth lenses 710 to 780 may have an aspherical coefficient as shown in the following Table 14. In an example, both the object-side surface and the image-side surface of the first to eighth lenses 710 to 780 may be aspherical.

[0297] Table 14

[0298]

[0299]

[0300] The optical imaging system configured as above may have Fig.14 Aberration characteristics shown in .

[0301] Will refer to Fig.15 and Fig.16 An example optical imaging system according to an eighth example embodiment is described.

[0302] The example optical imaging system 800 in the eighth example embodiment may include an optical system, and may also include a filter 890 and an image sensor IS, wherein the optical system includes a first lens 810, a second lens 820, a third lens 830, a fourth lens 840, a fifth lens 850, a sixth lens 860, a seventh lens 870 and an eighth lens 880.

[0303] The example optical imaging system 800 in the eighth example embodiment may form a focused image on an imaging surface 891. The imaging surface 891 may refer to a surface on which a focused image is formed by the optical imaging system. In an example, the imaging surface 891 may refer to one surface of the image sensor IS on which light is received.

[0304] The lens characteristics (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number and focal length) of each lens are listed in Table 15 below.

[0305] Table 15

[0306]

[0307]

[0308] In the example optical imaging system 800 according to the eighth example embodiment, the total focal length f can be 4.85 mm, IMGHT can be 5.107 mm, FOV can be 91.2°, SAG52 can be -0.5223 mm, SAG62 can be -0.8633 mm, SAG72 can be -1.0326 mm, and SAG82 can be -0.844 mm.

[0309] In the eighth example embodiment, the first lens 810 may have positive refractive power, a first surface of the first lens 810 may be convex, and a second surface of the first lens 810 may be concave.

[0310] The second lens 820 may have negative refractive power, a first surface of the second lens 820 may be convex, and a second surface of the second lens 820 may be concave.

[0311] The third lens 830 may have positive refractive power, and a first surface of the third lens 830 may be convex, and a second surface of the third lens 830 may be convex.

[0312] The fourth lens 840 may have negative refractive power, a first surface of the fourth lens 840 may be concave, and a second surface of the fourth lens 840 may be convex.

[0313] The fifth lens 850 may have negative refractive power, a first surface of the fifth lens 850 may be convex, and a second surface of the fifth lens 850 may be concave.

[0314] The sixth lens 860 may have positive refractive power, and a first surface of the sixth lens 860 may be convex in the paraxial region, and a second surface of the sixth lens 860 may be convex in the paraxial region.

[0315] At least one inflection point may be formed on at least one of the first surface and the second surface of the sixth lens 860. In an example, the first surface of the sixth lens 860 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the sixth lens 860 may be convex in the paraxial region and concave in a portion or region other than the paraxial region.

[0316] The seventh lens 870 may have positive refractive power, a first surface of the seventh lens 870 may be concave in the paraxial region, and a second surface of the seventh lens 870 may be convex in the paraxial region.

[0317] At least one inflection point may be formed on at least one of the first surface and the second surface of the seventh lens 870. In an example, the first surface of the seventh lens 870 may be concave in the paraxial region and convex in a portion or region other than the paraxial region. The second surface of the seventh lens 870 may be convex in the paraxial region and concave in a portion or region other than the paraxial region.

[0318] The eighth lens 880 may have negative refractive power, a first surface of the eighth lens 880 may be convex in the paraxial region, and a second surface of the eighth lens 880 may be concave in the paraxial region.

[0319] At least one inflection point may be formed on at least one of the first surface and the second surface of the eighth lens 880. In an example, the first surface of the eighth lens 880 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the eighth lens 880 may be concave in the paraxial region and convex in a portion or region other than the paraxial region.

[0320] Each surface of the first to eighth lenses 810 to 880 may have an aspherical coefficient as shown in the following Table 16. In an example, both the object-side surface and the image-side surface of the first to eighth lenses 810 to 880 may be aspherical.

[0321] Table 16

[0322]

[0323]

[0324] The optical imaging system configured as above may have Fig.16 Aberration characteristics shown in .

[0325] Will refer to Fig.17 and Fig.18 An example optical imaging system according to a ninth example embodiment is described.

[0326] The example optical imaging system 900 in the ninth example embodiment may include an optical system, and may also include a filter 990 and an image sensor IS, wherein the optical system includes a first lens 910, a second lens 920, a third lens 930, a fourth lens 940, a fifth lens 950, a sixth lens 960, a seventh lens 970 and an eighth lens 980.

[0327] The example optical imaging system 900 in the ninth example embodiment may form a focused image on an imaging surface 991. The imaging surface 991 may refer to a surface on which a focused image is formed by the optical imaging system. In an example, the imaging surface 991 may refer to one surface of the image sensor IS on which light is received.

[0328] The lens characteristics (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number and focal length) of each lens are listed in Table 17 below.

[0329] Table 17

[0330]

[0331]

[0332] In the example optical imaging system 900 according to the ninth embodiment, the total focal length f may be 5.45 mm, IMG HT may be 5.107 mm, FOV may be 83°, SAG52 may be -0.4981 mm, SAG62 may be -0.5886 mm, SAG72 may be -1.0419 mm, and SAG82 may be -1.37 mm.

[0333] In the ninth example embodiment, the first lens 910 may have positive refractive power, a first surface of the first lens 910 may be convex, and a second surface of the first lens 910 may be concave.

[0334] The second lens 920 may have negative refractive power, a first surface of the second lens 920 may be convex, and a second surface of the second lens 920 may be concave.

[0335] The third lens 930 may have positive refractive power, a first surface of the third lens 930 may be convex, and a second surface of the third lens 930 may be concave.

[0336] The fourth lens 940 may have negative refractive power, a first surface of the fourth lens 940 may be convex, and a second surface of the fourth lens 940 may be concave.

[0337] The fifth lens 950 may have negative refractive power, a first surface of the fifth lens 950 may be convex, and a second surface of the fifth lens 950 may be concave.

[0338] The sixth lens 960 may have positive refractive power, and a first surface of the sixth lens 960 may be convex in the paraxial region, and a second surface of the sixth lens 960 may be convex in the paraxial region.

[0339] At least one inflection point may be formed on at least one of the first surface and the second surface of the sixth lens 960. In an example, the first surface of the sixth lens 960 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the sixth lens 960 may be convex in the paraxial region and concave in a portion or region other than the paraxial region.

[0340] The seventh lens 970 may have positive refractive power, a first surface of the seventh lens 970 may be concave in the paraxial region, and a second surface of the seventh lens 970 may be convex in the paraxial region.

[0341] At least one inflection point may be formed on at least one of the first surface and the second surface of the seventh lens 970. In an example, the first surface of the seventh lens 970 may be concave in the paraxial region and convex in a portion or region other than the paraxial region. The second surface of the seventh lens 970 may be convex in the paraxial region and concave in a portion or region other than the paraxial region.

[0342] The eighth lens 980 may have negative refractive power, a first surface of the eighth lens 980 may be convex in the paraxial region, and a second surface of the eighth lens 980 may be concave in the paraxial region.

[0343] At least one inflection point may be formed on at least one of the first surface and the second surface of the eighth lens 980. In an example, the first surface of the eighth lens 980 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the eighth lens 980 may be concave in the paraxial region and convex in a portion or region other than the paraxial region.

[0344] Each surface of the first to eighth lenses 910 to 980 may have an aspherical coefficient as shown in the following Table 18. In an example, both the object-side surface and the image-side surface of the first to eighth lenses 910 to 980 may be aspherical.

[0345] Table 18

[0346]

[0347]

[0348] The optical imaging system configured as above may have Fig.18 Aberration characteristics shown in .

[0349] As described above, an example optical imaging system according to example embodiments may have a reduced size while achieving high resolution.

[0350] Although the present disclosure includes specific examples, it will be apparent after understanding the disclosure of the present 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 interpreted in a descriptive sense only and not for the purpose of limitation. The description of the features or aspects in each example should be considered applicable to similar features or aspects in other examples. Suitable results may also be obtained if the described techniques are performed in a different order, and / or if the components in the described system, architecture, device or circuit are combined in a different manner and / or replaced or supplemented with other components or their equivalents. Therefore, the scope of the present disclosure is not limited by a detailed description, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in the present disclosure.

Claims

1. An optical imaging system, comprising: A first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens sequentially arranged from the object side to the image side, and an image sensor that converts an image of an object incident thereon into an electrical signal, wherein: The first lens is configured to have a positive refractive power, a convex object side surface, and a concave image side surface; the second lens is configured to have a negative refractive power, a convex object side surface, and a concave image side surface; the third lens is configured to have a positive refractive power and a convex object side surface; the sixth lens is configured to have a convex object side surface; the seventh lens is configured to have a positive refractive power and a convex image side surface; the eighth lens is configured to have a negative refractive power, a convex object side surface, and a concave image side surface; and the refractive powers of the fourth lens to the sixth lens are arranged in one of negative-positive-negative, positive-negative-negative, and negative-negative-positive; The number of lenses with refractive power in the optical imaging system is eight; and 5.499 / (2×5.107) ≤ TTL / (2×IMG HT) < 0.6, -0.2 < SAG52 / TTL < 0, and 10 < v1 - (v6 + v7) / 2 < 30 are satisfied, where TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface, IMG HT is equal to half of the diagonal length of the imaging surface, SAG52 is the SAG value at the end of the effective aperture of the image side surface of the fifth lens, v1 is the Abbe number of the first lens, v6 is the Abbe number of the sixth lens, and v7 is the Abbe number of the seventh lens.

2. The optical imaging system according to claim 1, wherein: At least one of -0.2 < SAG62 / TTL < 0, -0.3 < SAG72 / TTL < 0, and -0.3 < SAG82 / TTL < 0 is satisfied, where SAG62 is the SAG value at the end of the effective aperture of the image side surface of the sixth lens, SAG72 is the SAG value at the end of the effective aperture of the image side surface of the seventh lens, and SAG82 is the SAG value at the end of the effective aperture of the image side surface of the eighth lens.

3. The optical imaging system according to claim 1, wherein: At least one of 25 < v1 - v2 < 45 and 20 < v1 - v4 < 45 is satisfied, where v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, and v4 is the Abbe number of the fourth lens.

4. The optical imaging system according to claim 1, wherein: 0 < f1 / f < 1.4 is satisfied, where f is the total focal length of the optical imaging system, and f1 is the focal length of the first lens.

5. The optical imaging system according to claim 1, wherein: -5 < f2 / f < -1 is satisfied, where f is the total focal length of the optical imaging system, and f2 is the focal length of the second lens.

6. The optical imaging system according to claim 1, wherein: 1 < f3 / f < 7 is satisfied, where f is the total focal length of the optical imaging system, and f3 is the focal length of the third lens.

7. The optical imaging system of claim 1, wherein: Satisfies 0.3<|f4 / f| / 10<15, Wherein, f is the total focal length of the optical imaging system, and f4 is the focal length of the fourth lens.

8. The optical imaging system of claim 1, wherein: Satisfies 0.2<|f5 / f| / 10<5, Wherein, f is the total focal length of the optical imaging system, and f5 is the focal length of the fifth lens.

9. The optical imaging system of claim 1, wherein: Satisfies 0.5<|f6 / f|<7, Wherein, f is the total focal length of the optical imaging system, and f6 is the focal length of the sixth lens.

10. The optical imaging system of claim 1, wherein: Satisfies 0<(f7 / f) / 10<5, Wherein, f is the total focal length of the optical imaging system, and f7 is the focal length of the seventh lens.

11. The optical imaging system of claim 1 , wherein: Satisfied - 3 <f8 / f<0, Wherein, f is the total focal length of the optical imaging system, and f8 is the focal length of the eighth lens.

12. The optical imaging system of claim 1, wherein: Satisfy 5.971 / 5.45≤TTL / f<1.4 and 0.915 / 5.45≤BFL / f<0.3, Wherein, f is the total focal length of the optical imaging system, and BFL is the distance from the image side surface of the eighth lens to the imaging surface on the optical axis.

13. The optical imaging system of claim 1, wherein: Satisfy D1 / f<0.1, Wherein, D1 is the distance between the image side surface of the first lens and the object side surface of the second lens on the optical axis.

14. The optical imaging system of claim 1, wherein: Satisfy 83°×(5.107 / 5.45)≤FOV×(IMG HT / f)≤94°×(5.107 / 4.48), Wherein, f is the total focal length of the optical imaging system, and FOV is the field of view of the optical imaging system.

Images