Optical image capturing system

Abstract

The present disclosure relates to an optical imaging system including a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a negative refractive power, a fifth lens having a positive refractive power, a sixth lens having a negative refractive power, and an eighth lens disposed in order from an object side. A refractive index of the second lens is greater than a refractive index of each of the first lens and the third lens. The optical imaging system satisfies TTL / (2 * IMG HT) lt; 0.6 and 0 lt; f1 / flt; tTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface, IMG HT is half of the diagonal length of the imaging surface, f is the total focal length of the optical imaging system, and f1 is the focal length of the first lens.

Description

[0001] Cross-references to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2022-0115737, filed on September 14, 2022, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. Technical Field

[0003] The following description relates to optical imaging systems. Background Technology

[0004] Recent portable terminals may include cameras equipped with optical imaging systems that include multiple lenses to perform video calls and capture images.

[0005] As the functionality of cameras in portable devices increases, the demand for high-resolution cameras for portable devices is also increasing.

[0006] In particular, image sensors with high pixel counts (e.g., 13 to 100 million pixels) have recently been used in cameras for portable devices to achieve clearer image quality.

[0007] That is, the size of the image sensor has increased, and therefore the overall length of the optical imaging system has also increased, which may lead to the problem of the camera protruding from the portable terminal.

[0008] Furthermore, since portable terminals are designed to be small in size, and cameras used in portable terminals also need to be smaller in size, it is necessary to develop an optical imaging system that is small in size and achieves high resolution. Summary of the Invention

[0009] This summary is provided to present, in a simplified form, some concepts further described in the following detailed description. This summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter.

[0010] In one general aspect, an 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 arranged sequentially from the object side, wherein the first lens has positive refractive power and the second lens has negative refractive power. The refractive index of the second lens is greater than the refractive index of each of the first and third lenses. The optical imaging system satisfies TTL / (2×IMG HT) < 0.6 and 0 < f1 / f < 1.4, where TTL is the distance on the optical axis from the object side of the first lens to the imaging plane, IMG HT is half the diagonal length of the imaging plane, f is the total focal length of the optical imaging system, and f1 is the focal length of the first lens.

[0011] In the first to eighth lenses, at least three lenses, including the second lens, may have a refractive index greater than 1.61, and among the at least three lenses having a refractive index greater than 1.61, the absolute value of the focal length of the second lens may be the smallest.

[0012] The optical imaging system can satisfy at least one of 25 < v1-v2 < 45, v1-v4 < 45, and 10 < v1-(v6+v7) / 2 < 30, where 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.

[0013] The second, fifth, and sixth lenses can have a refractive index greater than 1.61, and the optical imaging system can satisfy 60 < v2 + v5 + v6 < 80, where v2 is the Abbe number of the second lens, v5 is the Abbe number of the fifth lens, and v6 is the Abbe number of the sixth lens.

[0014] The fifth lens may have negative refractive power, and each of the second and fifth lenses may have a refractive index greater than 1.66.

[0015] An optical imaging system can satisfy at least one of the following: -10 < f2 / f < -1; 1 < |f3 / f|; and 3 < |f4 / f|, where f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens.

[0016] The optical imaging system can satisfy -0.6 < f1 / f2 < 0.

[0017] The optical imaging system can satisfy -0.1 < f1 / f3 < 1.

[0018] Optical imaging systems can satisfy 0 < |f2 / f3| < 1.

[0019] The optical imaging system can satisfy 1.5 < f34 / f < 5.5, where f34 is the combined focal length of the third lens and the fourth lens.

[0020] The optical imaging system can satisfy at least one of the following: 3 < |f5 / f|; 1 < |f6 / f|; 0 < f7 / f < 2; and -1 < f8 / f < 0, where 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.

[0021] The optical imaging system can satisfy TTL / f < 1.3 and BFL / f < 0.3, where BFL is the distance on the optical axis from the image side of the eighth lens to the imaging surface.

[0022] The optical imaging system can satisfy 0 < D1 / f < 0.1, where D1 is the distance on the optical axis from the image side of the first lens to the object side of the second lens.

[0023] The optical imaging system can satisfy 0 < D3 / f < 0.2, where D3 is the distance on the optical axis from the image side of the third lens to the object side of the fourth lens.

[0024] The optical imaging system can satisfy 70° < FOV × (IMG HT / f), where FOV is the field of view of the optical imaging system.

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

[0026] Other features and aspects will be apparent from the following detailed description, the drawings, and the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a diagram showing an optical imaging system according to the first example.

[0028] Figure 2 is a representation Figure 1 of the aberration characteristics of the optical imaging system shown in

[0029] Figure 3 is a diagram showing an optical imaging system according to the second example.

[0030] Figure 4 is a representation Figure 3 of the aberration characteristics of the optical imaging system shown in

[0031] Figure 5 is a diagram showing an optical imaging system according to the third example.

[0032] Figure 6 It means Figure 5 The curves showing the aberration characteristics of the optical imaging system are shown.

[0033] Figure 7 This is a diagram illustrating an optical imaging system according to the fourth example.

[0034] Figure 8 It means Figure 7 The curves showing the aberration characteristics of the optical imaging system are shown.

[0035] Figure 9 This is a diagram illustrating an optical imaging system according to the fifth example.

[0036] Figure 10 It means Figure 9 The curves showing the aberration characteristics of the optical imaging system are shown.

[0037] Figure 11 This is a diagram illustrating an optical imaging system according to the sixth example.

[0038] Figure 12 It means Figure 11 The curves showing the aberration characteristics of the optical imaging system are shown.

[0039] Figure 13 This is a diagram illustrating the optical imaging system according to the seventh example.

[0040] Figure 14 It means Figure 13 The curves showing the aberration characteristics of the optical imaging system are shown.

[0041] Figure 15 This is a diagram illustrating an optical imaging system according to the eighth example.

[0042] Figure 16 It means Figure 15 The curves showing the aberration characteristics of the optical imaging system are shown.

[0043] Throughout the accompanying drawings and specific embodiments, the same reference numerals denote the same elements. For clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative dimensions, scale, and descriptions of the elements in the drawings may be exaggerated. Detailed Implementation

[0044] The following detailed embodiments are provided to help the reader 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 be readily apparent to those skilled in the art. For example, the order of operations described herein is merely illustrative and is not limited to the order presented herein, but rather can be modified as will be apparent to those skilled in the art, except for operations that must occur in a certain order. Furthermore, for clarity and brevity, descriptions of functions and structures well-known to those skilled in the art may be omitted.

[0045] The features described herein may be implemented in different forms and are not to be construed as limited to the examples described herein. Rather, the examples described herein are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art.

[0046] In this document, it should be noted that the term “may” is used with respect to examples or implementations, such as what an example or implementation may include or implement, meaning that there exists at least one example or implementation that includes or implements this feature, but not all examples and implementations are limited thereto.

[0047] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on," "connected to," or "attached to" another element, it may be directly "on," directly "connected to," or directly "attached to" the other element, or there may be one or more other elements in between. Conversely, when an element is described as being "directly" "on," "directly connected to," or "directly attached to" another element, there are no other elements in between.

[0048] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more of the associated listed items.

[0049] Although terms such as “first,” “second,” and “third” may be used in this document to describe various components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, the first component, first assembly, first region, first layer, or first part mentioned in the examples described herein may also be referred to as a second component, second assembly, second region, second layer, or second part without departing from the teachings of the examples.

[0050] For ease of description, spatial relative terms such as “above,” “upper,” “below,” and “lower” may be used herein to describe the relationship between one element and another, as shown in the accompanying drawings. In addition to the orientation depicted in the drawings, these spatial relative terms are intended to also include different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as “above” or “upper” relative to another element will consequently be “below” or “lower” relative to said other element. Therefore, the term “above” includes both upper and lower orientations, depending on the spatial orientation of the device. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein will be interpreted accordingly.

[0051] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. The articles “a,” “an,” and “the” are intended to include plural forms as well, unless the context clearly indicates otherwise. The terms “comprising,” “including,” and “having” specify the presence of the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0052] The shapes shown in the accompanying drawings may vary due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include shape variations that occur during manufacturing.

[0053] As will be apparent upon understanding the disclosure of this application, the features of the examples described herein can be combined in various ways. Furthermore, although the examples described herein have multiple configurations, other configurations are also possible, as will be apparent upon understanding the disclosure of this application.

[0054] In the accompanying drawings illustrating the lens, the thickness, size, and shape of the lens are exaggerated to illustrate an example, and the spherical or aspherical shape of the lens shown in the drawings is an example, and the shape is not limited thereto.

[0055] The first lens refers to the lens closest to the object side, while the eighth lens refers to the lens closest to the imaging surface (or image sensor).

[0056] Furthermore, in each lens, the first surface refers to the surface adjacent to the object side (or object-side surface), and the second surface refers to the surface adjacent to the image side (or image-side surface). Additionally, in each example, the units for the lens's radius of curvature, thickness, distance, focal length, etc., are millimeters, and the unit for the field of view (FOV) is degrees.

[0057] Furthermore, in the description of the shape of each lens, the concept of one surface being convex means that the paraxial region of that surface is convex, the concept of one surface being concave means that the paraxial region of that surface is concave, and the concept of one surface being planar means that the paraxial region of that surface is planar. Therefore, even when one surface of a lens is described as convex, the edge portion of the lens can still be concave. Similarly, even when one surface of a lens is described as concave, the edge portion of the lens can still be convex. Furthermore, when one surface of a lens is described as planar, the edge portion of the lens can still be either convex or concave.

[0058] The paraxial region refers to the relatively narrow region adjacent to the optical axis.

[0059] An imaging plane can refer to a virtual plane on which a focal point can be formed by an optical imaging system. Alternatively, an imaging plane can refer to a surface of an image sensor on which light is received.

[0060] The optical imaging systems in various examples may include eight lenses.

[0061] For example, an optical imaging 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. The first to eighth lenses may be spaced apart from each other by a predetermined distance along the optical axis.

[0062] However, an optical imaging system may not simply consist of eight lenses, and may include other components if necessary.

[0063] For example, an optical imaging system may also include an image sensor for converting incident light from an object into an electrical signal.

[0064] In addition, the optical imaging system may also include an infrared cutoff filter (hereinafter referred to as the "filter") for blocking infrared light. The filter may be positioned between the eighth lens and the image sensor.

[0065] In addition, the optical imaging system may also include an aperture for adjusting the amount of incident light.

[0066] The first through eighth lenses in the optical imaging system can be formed of plastic material.

[0067] Furthermore, at least one of the first to eighth lenses has an aspherical surface. Additionally, each of the first to eighth lenses may have at least one aspherical surface.

[0068] That is, at least one of the first and second surfaces of the first to eighth lenses can be aspherical. Here, the aspherical surface of the first to eighth lenses is represented by Equation 1.

[0069] [Formula 1]

[0070] In Equation 1, c is the reciprocal of the radius of curvature of the lens, K is the conic constant, and Y is the distance from a point on the aspherical surface of the lens to the optical axis. Furthermore, constants A to H and J to P refer to the aspherical coefficients. Z is the distance along the optical axis between a point on the aspherical surface of the lens and a vertex on the aspherical surface.

[0071] The optical imaging systems in the various examples can satisfy at least one of the following conditional expressions: [Conditional Expression 1] 0 < f1 / f < 1.4 [Conditional Expression 2] 25 < v1 - v2 < 45 [Conditional Expression 3] v1-v4 < 45 [Conditional Expression 4] 10 < v1-(v6+v7) / 2 < 30 [Conditional expression 5] -10 < f2 / f < -1 [Conditional Expression 6] 1 < |f3 / f| [Conditional expression 7] 3 < |f4 / f| [Conditional Expression 8] 3 < |f5 / f| [Conditional expression 9] 1 < |f6 / f| [Conditional Expression 10] 0 < f7 / f < 2 [Conditional expression 11] -1 < f8 / f < 0 [Conditional Expression 12] TTL / f < 1.3 [Conditional Expression 13] -0.6 < f1 / f2 < 0 [Conditional Expression 14] -0.1 < f1 / f3 < 1 [Conditional Expression 15] 0 < |f2 / f3| < 1 [Conditional Expression 16] 1.5 < f34 / f < 5.5 [Conditional Expression 17] BFL / f < 0.3 [Conditional Expression 18] 0 < D1 / f < 0.1 [Conditional Expression 19] 0 < D3 / f < 0.2 [Conditional Expression 20] TTL / (2×IMG HT) < 0.6 [Conditional Expression 21] 70° < FOV×(IMG HT / f) [Conditional Expression 22] 60 < v2+v5+v6 < 80 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, f8 is the focal length of the eighth lens, and f34 is the combined focal length of the third and fourth lenses.

[0072] 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, v5 is the Abbe number of the fifth lens, v6 is the Abbe number of the sixth lens, and v7 is the Abbe number of the seventh lens.

[0073] In the conditional expression, TTL is the distance on the optical axis from the object side of the first lens to the imaging plane, BFL is the distance on the optical axis from the image side of the eighth lens to the imaging plane, D1 is the distance on the optical axis between the image side of the first lens and the object side of the second lens, and D3 is the distance on the optical axis between the image side of the third lens and the object side of the fourth lens.

[0074] In the conditional expression, IMG HT is half the diagonal length of the imaging plane, and FOV is the field of view of the optical imaging system.

[0075] The first lens may have positive refractive power. Furthermore, the first lens may have a meniscus shape that convexes towards the object side. More specifically, the first surface of the first lens may be convex, and the second surface of the first lens may be concave.

[0076] At least one of the first surface and the second surface of the first lens may be aspherical. For example, both surfaces of the first lens may be aspherical.

[0077] The second lens can have negative refractive power. Furthermore, the second lens can have a meniscus shape that convexes towards the object side. More specifically, the first surface of the second lens can be convex, and the second surface of the second lens can be concave.

[0078] At least one of the first and second surfaces of the second lens can be aspherical. For example, both surfaces of the second lens can be aspherical.

[0079] The third lens can have positive or negative refractive power. Furthermore, the third lens can have a meniscus shape that convexes towards the object side. More specifically, the first surface of the third lens can be convex, and the second surface of the third lens can be concave.

[0080] At least one of the first and second surfaces of the third lens can be aspherical. For example, both surfaces of the third lens can be aspherical.

[0081] The fourth lens can have positive refractive power. Furthermore, the fourth lens can have a meniscus shape that convexes towards the image side. More specifically, the first surface of the fourth lens can be concave, and the second surface of the fourth lens can be convex.

[0082] Alternatively, the fourth lens may have a meniscus shape that convexes toward the object side. More specifically, the first surface of the fourth lens may be convex, and the second surface of the fourth lens may be concave.

[0083] Alternatively, both surfaces of the fourth lens may be convex. More specifically, the first and second surfaces of the fourth lens may be convex.

[0084] At least one of the first and second surfaces of the fourth lens may be aspherical. For example, both surfaces of the fourth lens may be aspherical.

[0085] The fifth lens can have negative refractive power. Furthermore, the fifth lens can have a meniscus shape that convexes towards the object side. More specifically, the first surface of the fifth lens can be convex in the paraxial region, and the second surface of the fifth lens can be concave in the paraxial region.

[0086] Alternatively, the fifth lens may have a meniscus shape that convexes toward the image side. More specifically, the first surface of the fifth lens may be concave, and the second surface of the fifth lens may be convex.

[0087] Alternatively, both surfaces of the fifth lens may be concave. More specifically, the first and second surfaces of the fifth lens may be concave.

[0088] At least one of the first and second surfaces of the fifth lens may be aspherical. For example, both surfaces of the fifth lens may be aspherical.

[0089] The sixth lens can have positive or negative refractive power. Furthermore, the sixth lens can have a meniscus shape that convexes towards the object side. More specifically, the first surface of the sixth lens can be convex in the paraxial region, and the second surface of the sixth lens can be concave in the paraxial region.

[0090] At least one of the first and second surfaces of the sixth lens may be aspherical. For example, both surfaces of the sixth lens may be aspherical.

[0091] The sixth lens may have at least one inflection point formed on at least one of the first and second surfaces. For example, the first surface of the sixth lens may be convex in the paraxial region and concave in portions other than the paraxial region. The second surface of the sixth lens may be concave in the paraxial region and convex in portions other than the paraxial region.

[0092] The seventh lens can have positive refractive power. Furthermore, the seventh lens can have a meniscus shape that convexes towards the object side. More specifically, the first surface of the seventh lens can be convex in the paraxial region, and the second surface of the seventh lens can be concave in the paraxial region.

[0093] Alternatively, both surfaces of the seventh lens may be convex. More specifically, the first and second surfaces of the seventh lens may be convex.

[0094] At least one of the first and second surfaces of the seventh lens may be aspherical. For example, both surfaces of the seventh lens may be aspherical.

[0095] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the seventh lens. For example, the first surface of the seventh lens may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the seventh lens may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0096] The eighth lens can have negative refractive power. Furthermore, the eighth lens can have a meniscus shape that convexes towards the object side. More specifically, the first surface of the eighth lens can be convex in the paraxial region, and the second surface of the eighth lens can be concave in the paraxial region.

[0097] Alternatively, both surfaces of the eighth lens may be recessed. More specifically, the first and second surfaces of the eighth lens may be recessed.

[0098] At least one of the first and second surfaces of the eighth lens may be aspherical. For example, both surfaces of the eighth lens may be aspherical.

[0099] Furthermore, in the eighth lens, at least one inflection point may be formed on at least one of the first and second surfaces. For example, the first surface of the eighth lens may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the eighth lens may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0100] Each of the first through third lenses can be configured to have a refractive index different from that of its adjacent lens. For example, the first and second lenses may have different refractive indices, and the second and third lenses may also have different refractive indices. Furthermore, among the first through third lenses, the second lens may have the largest refractive index.

[0101] In the first through eighth lenses, at least three lenses, including the second lens, can have a refractive index greater than 1.61. For example, the refractive indices of the second, fifth, and sixth lenses can be greater than 1.61. Furthermore, the refractive indices of the second and fifth lenses can be greater than 1.66.

[0102] In a lens with a refractive index greater than 1.61, the absolute value of the focal length of the second lens can be the lowest.

[0103] Reference Figure 1 and Figure 2 The optical imaging system 100 according to the first example is described.

[0104] The optical imaging system 100 may include an optical system comprising 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, and may also include a filter 190 and an image sensor IS.

[0105] The optical imaging system 100 can form a focal point on the imaging surface 191. The imaging surface 191 can refer to the surface on which the optical imaging system 100 can form a focal point. For example, the imaging surface 191 can refer to a surface of the image sensor IS on which light is received.

[0106] Table 1 lists the lens characteristics of each lens (radius of curvature, lens thickness or distance between lenses, refractive index, Abbe number, and focal length).

[0107] [Table 1]

[0108] The total focal length f of the optical imaging system 100 can be 6.3132mm, the IMG HT can be 6.12mm, and the FOV can be 85.3°.

[0109] In the first example, the first lens 110 may have positive refractive power, the first surface of the first lens 110 may be convex, and the second surface of the first lens 110 may be concave.

[0110] The second lens 120 may have negative refractive power, the first surface of the second lens 120 may be convex, and the second surface of the second lens 120 may be concave.

[0111] The third lens 130 may have negative refractive power, the first surface of the third lens 130 may be convex, and the second surface of the third lens 130 may be concave.

[0112] The fourth lens 140 may have positive refractive power, the first surface of the fourth lens 140 may be concave, and the second surface of the fourth lens 140 may be convex.

[0113] The fifth lens 150 may have negative refractive power, the first surface of the fifth lens 150 may be concave, and the second surface of the fifth lens 150 may be convex.

[0114] The sixth lens 160 may have negative refractive power, the first surface of the sixth lens 160 may be convex in the paraxial region, and the second surface of the sixth lens 160 may be concave in the paraxial region.

[0115] Furthermore, 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. For example, the first surface of the sixth lens 160 may be convex in the paraxial region and concave in the portion other than the paraxial region. Similarly, the second surface of the sixth lens 160 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0116] The seventh lens 170 may have positive refractive power, the first surface of the seventh lens 170 may be convex in the paraxial region, and the second surface of the seventh lens 170 may be concave in the paraxial region.

[0117] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the seventh lens 170. For example, the first surface of the seventh lens 170 may be convex in the paraxial region and concave in the portion other than the paraxial region. Similarly, the second surface of the seventh lens 170 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0118] The eighth lens 180 may have negative refractive power, the first surface of the eighth lens 180 may be convex in the paraxial region, and the second surface of the eighth lens 180 may be concave in the paraxial region.

[0119] Furthermore, 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. For example, the first surface of the eighth lens 180 may be convex in the paraxial region and concave in the portion other than the paraxial region. Similarly, the second surface of the eighth lens 180 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0120] Each surface of the first lens 110 to the eighth lens 180 may have aspheric coefficients as shown in Table 2. For example, both the object side and the image side of the first lens 110 to the eighth lens 180 may be aspherical.

[0121] [Table 2]

[0122] In addition, the optical imaging system 100 may have Figure 2 The aberration characteristics shown are illustrated.

[0123] Reference Figure 3 and Figure 4 The optical imaging system 200 is described according to the second example.

[0124] The optical imaging system 200 may include an optical system comprising 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, and may also include a filter 290 and an image sensor IS.

[0125] The optical imaging system 200 can form a focal point on the imaging surface 291. The imaging surface 291 can refer to the surface on which the optical imaging system 200 can form a focal point. For example, the imaging surface 291 can refer to a surface of the image sensor IS on which light is received.

[0126] Table 3 lists the lens characteristics of each lens (radius of curvature, lens thickness or distance between lenses, refractive index, Abbe number, and focal length).

[0127] [Table 3]

[0128] The total focal length f of the optical imaging system 200 can be 6.3083mm, the IMG HT can be 6.12mm, and the FOV can be 85.3°.

[0129] In the second example, the first lens 210 may have positive refractive power, the first surface of the first lens 210 may be convex, and the second surface of the first lens 210 may be concave.

[0130] The second lens 220 may have negative refractive power, the first surface of the second lens 220 may be convex, and the second surface of the second lens 220 may be concave.

[0131] The third lens 230 may have positive refractive power, the first surface of the third lens 230 may be convex, and the second surface of the third lens 230 may be concave.

[0132] The fourth lens 240 may have positive refractive power, the first surface of the fourth lens 240 may be concave, and the second surface of the fourth lens 240 may be convex.

[0133] The fifth lens 250 may have negative refractive power, the first surface of the fifth lens 250 may be convex, and the second surface of the fifth lens 250 may be concave.

[0134] The sixth lens 260 may have negative refractive power, the first surface of the sixth lens 260 may be convex in the paraxial region, and the second surface of the sixth lens 260 may be concave in the paraxial region.

[0135] Furthermore, 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. For example, the first surface of the sixth lens 260 may be convex in the paraxial region and concave in the portion other than the paraxial region. Similarly, the second surface of the sixth lens 260 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0136] The seventh lens 270 may have positive refractive power, the first surface of the seventh lens 270 may be convex in the paraxial region, and the second surface of the seventh lens 270 may be concave in the paraxial region.

[0137] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the seventh lens 270. For example, the first surface of the seventh lens 270 may be convex in the paraxial region and concave in the portion other than the paraxial region. Similarly, the second surface of the seventh lens 270 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0138] The eighth lens 280 may have negative refractive power, the first surface of the eighth lens 280 may be convex in the paraxial region, and the second surface of the eighth lens 280 may be concave in the paraxial region.

[0139] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the eighth lens 280. For example, the first surface of the eighth lens 280 may be convex in the paraxial region and concave in the portion other than the paraxial region. Similarly, the second surface of the eighth lens 280 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0140] Each surface of the first lens 210 to the eighth lens 280 may have aspheric coefficients as shown in Table 4. For example, both the object side and the image side of the first lens 210 to the eighth lens 280 may be aspherical.

[0141] [Table 4]

[0142] In addition, the optical imaging system 200 may have Figure 4 The aberration characteristics shown are illustrated.

[0143] Reference Figure 5 and Figure 6 The optical imaging system 300 is described according to the third example.

[0144] The optical imaging system 300 may include an optical system comprising 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, and may also include a filter 390 and an image sensor IS.

[0145] The optical imaging system 300 can form a focal point on the imaging surface 391. The imaging surface 391 can refer to the surface on which the optical imaging system 300 can form a focal point. For example, the imaging surface 391 can refer to a surface of the image sensor IS on which light is received.

[0146] Table 5 lists the lens characteristics of each lens (radius of curvature, lens thickness or distance between lenses, refractive index, Abbe number, and focal length).

[0147] [Table 5]

[0148] The total focal length f of the optical imaging system 300 can be 6.2878mm, the IMG HT can be 6.12mm, and the FOV can be 85.3°.

[0149] In the third example, the first lens 310 may have positive refractive power, the first surface of the first lens 310 may be convex, and the second surface of the first lens 310 may be concave.

[0150] The second lens 320 may have negative refractive power, the first surface of the second lens 320 may be convex, and the second surface of the second lens 320 may be concave.

[0151] The third lens 330 may have positive refractive power, the first surface of the third lens 330 may be convex, and the second surface of the third lens 330 may be concave.

[0152] The fourth lens 340 may have positive refractive power, the first surface of the fourth lens 340 may be concave, and the second surface of the fourth lens 340 may be convex.

[0153] The fifth lens 350 may have negative refractive power, the first surface of the fifth lens 350 may be convex, and the second surface of the fifth lens 350 may be concave.

[0154] The sixth lens 360 may have negative refractive power, the first surface of the sixth lens 360 may be convex in the paraxial region, and the second surface of the sixth lens 360 may be concave in the paraxial region.

[0155] Furthermore, at least one inflection point may be formed on at least one of the first surface and the second surface of the sixth lens 360. For example, the first surface of the sixth lens 360 may be convex in the paraxial region and concave in the portion other than the paraxial region. Similarly, the second surface of the sixth lens 360 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0156] The seventh lens 370 may have positive refractive power, the first surface of the seventh lens 370 may be convex in the paraxial region, and the second surface of the seventh lens 370 may be concave in the paraxial region.

[0157] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the seventh lens 370. For example, the first surface of the seventh lens 370 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the seventh lens 370 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0158] The eighth lens 380 may have negative refractive power, the first surface of the eighth lens 380 may be convex in the paraxial region, and the second surface of the eighth lens 380 may be concave in the paraxial region.

[0159] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the eighth lens 380. For example, the first surface of the eighth lens 380 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the eighth lens 380 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0160] Each surface of the first lens 310 to the eighth lens 380 may have aspherical coefficients as shown in Table 6. For example, both the object side and the image side of the first lens 310 to the eighth lens 380 may be aspherical.

[0161] [Table 6]

[0162] In addition, the optical imaging system 300 can have Figure 6 The aberration characteristics shown are illustrated.

[0163] Reference Figure 7 and Figure 8 The optical imaging system 400 is described according to the fourth example.

[0164] The optical imaging system 400 may include an optical system comprising 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, and may also include a filter 490 and an image sensor IS.

[0165] The optical imaging system 400 can form a focal point on the imaging surface 491. The imaging surface 491 can refer to the surface on which the optical imaging system 400 can form a focal point. For example, the imaging surface 491 can refer to a surface of the image sensor IS on which light is received.

[0166] Table 7 lists the lens characteristics of each lens (radius of curvature, lens thickness or distance between lenses, refractive index, Abbe number, and focal length).

[0167] [Table 7]

[0168] The total focal length f of the optical imaging system 400 can be 6.338mm, the IMG HT can be 6.12mm, and the FOV can be 85.3°.

[0169] In the fourth example, the first lens 410 may have positive refractive power, the first surface of the first lens 410 may be convex, and the second surface of the first lens 410 may be concave.

[0170] The second lens 420 may have negative refractive power, the first surface of the second lens 420 may be convex, and the second surface of the second lens 420 may be concave.

[0171] The third lens 430 may have positive refractive power, the first surface of the third lens 430 may be convex, and the second surface of the third lens 430 may be concave.

[0172] The fourth lens 440 may have positive refractive power, the first surface of the fourth lens 440 may be concave, and the second surface of the fourth lens 440 may be convex.

[0173] The fifth lens 450 may have negative refractive power, the first surface of the fifth lens 450 may be convex, and the second surface of the fifth lens 450 may be concave.

[0174] The sixth lens 460 may have negative refractive power, the first surface of the sixth lens 460 may be convex in the paraxial region, and the second surface of the sixth lens 460 may be concave in the paraxial region.

[0175] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the sixth lens 460. For example, the first surface of the sixth lens 460 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the sixth lens 460 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0176] The seventh lens 470 may have positive refractive power, the first surface of the seventh lens 470 may be convex in the paraxial region, and the second surface of the seventh lens 470 may be concave in the paraxial region.

[0177] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the seventh lens 470. For example, the first surface of the seventh lens 470 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the seventh lens 470 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0178] The eighth lens 480 can have negative refractive power. The first surface of the eighth lens 480 can be convex in the paraxial region, while the second surface of the eighth lens 480 can be concave in the paraxial region.

[0179] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the eighth lens 480. For example, the first surface of the eighth lens 480 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the eighth lens 480 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0180] Each surface of the first lens 410 to the eighth lens 480 may have aspherical coefficients as shown in Table 8. For example, both the object side and the image side of the first lens 410 to the eighth lens 480 may be aspherical.

[0181] [Table 8]

[0182] In addition, the optical imaging system 400 can have Figure 8 The aberration characteristics shown are illustrated.

[0183] Reference Figure 9 and Figure 10 The optical imaging system 500 is described according to the fifth example.

[0184] The optical imaging system 500 may include an optical system comprising 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, and may also include a filter 590 and an image sensor IS.

[0185] The optical imaging system 500 can form a focal point on the imaging surface 591. The imaging surface 591 can refer to the surface on which the optical imaging system 500 can form a focal point. For example, the imaging surface 591 can refer to a surface of the image sensor IS on which light is received.

[0186] Table 9 lists the lens characteristics of each lens (radius of curvature, lens thickness or distance between lenses, refractive index, Abbe number, and focal length).

[0187] [Table 9]

[0188] The total focal length f of the optical imaging system 500 can be 6.4215mm, the IMG HT can be 6.12mm, and the FOV can be 85.3°.

[0189] In the fifth example, the first lens 510 may have positive refractive power, the first surface of the first lens 510 may be convex, and the second surface of the first lens 510 may be concave.

[0190] The second lens 520 may have negative refractive power, the first surface of the second lens 520 may be convex, and the second surface of the second lens 520 may be concave.

[0191] The third lens 530 may have positive refractive power, the first surface of the third lens 530 may be convex, and the second surface of the third lens 530 may be concave.

[0192] The fourth lens 540 may have positive refractive power, the first surface of the fourth lens 540 may be convex, and the second surface of the fourth lens 540 may be concave.

[0193] The fifth lens 550 may have negative refractive power, and the first and second surfaces of the fifth lens 550 may be concave.

[0194] The sixth lens 560 may have positive refractive power, the first surface of the sixth lens 560 may be convex in the paraxial region, and the second surface of the sixth lens 560 may be concave in the paraxial region.

[0195] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the sixth lens 560. For example, the first surface of the sixth lens 560 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the sixth lens 560 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0196] The seventh lens 570 may have positive refractive power, and the first and second surfaces of the seventh lens 570 may be convex in the paraxial region.

[0197] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the seventh lens 570. For example, the first surface of the seventh lens 570 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the seventh lens 570 may be convex in the paraxial region and concave in the portion other than the paraxial region.

[0198] The eighth lens 580 may have negative refractive power, and the first and second surfaces of the eighth lens 580 may be concave in the paraxial region.

[0199] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the eighth lens 580. For example, the first surface of the eighth lens 580 may be concave in the paraxial region and convex in the portion other than the paraxial region. The second surface of the eighth lens 580 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0200] Each surface of the first lens 510 to the eighth lens 580 may have aspheric coefficients as shown in Table 10. For example, both the object side and the image side of the first lens 510 to the eighth lens 580 may be aspherical.

[0201] [Table 10]

[0202] In addition, the optical imaging system 500 can have Figure 10 The aberration characteristics shown are illustrated.

[0203] Reference Figure 11 and Figure 12 The optical imaging system 600 is described according to the sixth example.

[0204] The optical imaging system 600 may include an optical system comprising 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, and may also include a filter 690 and an image sensor IS.

[0205] The optical imaging system 600 can form a focal point on the imaging surface 691. The imaging surface 691 can refer to the surface on which the optical imaging system 600 can form a focal point. For example, the imaging surface 691 can refer to a surface of the image sensor IS on which light is received.

[0206] Table 11 lists the lens characteristics of each lens (radius of curvature, lens thickness or distance between lenses, refractive index, Abbe number, and focal length).

[0207] [Table 11]

[0208] The total focal length f of the optical imaging system 600 can be 6.2999mm, the IMG HT can be 6.12mm, and the FOV can be 85.3°.

[0209] In the sixth example, the first lens 610 may have positive refractive power, the first surface of the first lens 610 may be convex, and the second surface of the first lens 610 may be concave.

[0210] The second lens 620 may have negative refractive power, the first surface of the second lens 620 may be convex, and the second surface of the second lens 620 may be concave.

[0211] The third lens 630 may have negative refractive power, the first surface of the third lens 630 may be convex, and the second surface of the third lens 630 may be concave.

[0212] The fourth lens 640 may have positive refractive power, the first surface of the fourth lens 640 may be concave, and the second surface of the fourth lens 640 may be convex.

[0213] The fifth lens 650 may have negative refractive power, the first surface of the fifth lens 650 may be convex, and the second surface of the fifth lens 650 may be concave.

[0214] The sixth lens 660 may have negative refractive power, the first surface of the sixth lens 660 may be convex in the paraxial region, and the second surface of the sixth lens 660 may be concave in the paraxial region.

[0215] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the sixth lens 660. For example, the first surface of the sixth lens 660 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the sixth lens 660 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0216] The seventh lens 670 may have positive refractive power, the first surface of the seventh lens 670 may be convex in the paraxial region, and the second surface of the seventh lens 670 may be concave in the paraxial region.

[0217] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the seventh lens 670. For example, the first surface of the seventh lens 670 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the seventh lens 670 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0218] The eighth lens 680 may have negative refractive power, the first surface of the eighth lens 680 may be convex in the paraxial region, and the second surface of the eighth lens 680 may be concave in the paraxial region.

[0219] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the eighth lens 680. For example, the first surface of the eighth lens 680 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the eighth lens 680 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0220] Each surface of the first lens 610 to the eighth lens 680 may have aspheric coefficients as shown in Table 12. For example, both the object side and the image side of the first lens 610 to the eighth lens 680 may be aspherical.

[0221] [Table 12]

[0222] In addition, the optical imaging system 600 can have Figure 12 The aberration characteristics shown are illustrated.

[0223] Reference Figure 13 and Figure 14 The optical imaging system 700 is described according to the seventh example.

[0224] The optical imaging system 700 may include an optical system comprising 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, and may also include a filter 790 and an image sensor IS.

[0225] The optical imaging system 700 can form a focal point on the imaging surface 791. The imaging surface 791 can refer to the surface on which the optical imaging system 700 can form a focal point. For example, the imaging surface 791 can refer to a surface of the image sensor IS on which light is received.

[0226] Table 13 lists the lens characteristics of each lens (radius of curvature, lens thickness or distance between lenses, refractive index, Abbe number, and focal length).

[0227] [Table 13]

[0228] The total focal length f of the optical imaging system 700 can be 6.2796mm, the IMG HT can be 6.12mm, and the FOV can be 85.3°.

[0229] In the seventh example, the first lens 710 may have positive refractive power, the first surface of the first lens 710 may be convex, and the second surface of the first lens 710 may be concave.

[0230] The second lens 720 may have negative refractive power, the first surface of the second lens 720 may be convex, and the second surface of the second lens 720 may be concave.

[0231] The third lens 730 may have negative refractive power, the first surface of the third lens 730 may be convex, and the second surface of the third lens 730 may be concave.

[0232] The fourth lens 740 may have positive refractive power, and the first and second surfaces of the fourth lens 740 may be convex.

[0233] The fifth lens 750 may have negative refractive power, the first surface of the fifth lens 750 may be convex, and the second surface of the fifth lens 750 may be concave.

[0234] The sixth lens 760 may have negative refractive power, the first surface of the sixth lens 760 may be convex in the paraxial region, and the second surface of the sixth lens 760 may be concave in the paraxial region.

[0235] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the sixth lens 760. For example, the first surface of the sixth lens 760 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the sixth lens 760 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0236] The seventh lens 770 may have positive refractive power, the first surface of the seventh lens 770 may be convex in the paraxial region, and the second surface of the seventh lens 770 may be concave in the paraxial region.

[0237] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the seventh lens 770. For example, the first surface of the seventh lens 770 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the seventh lens 770 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0238] The eighth lens 780 may have negative refractive power, the first surface of the eighth lens 780 may be convex in the paraxial region, and the second surface of the eighth lens 780 may be concave in the paraxial region.

[0239] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the eighth lens 780. For example, the first surface of the eighth lens 780 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the eighth lens 780 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0240] Each surface of the first lens 710 to the eighth lens 780 may have aspherical coefficients as shown in Table 14. For example, both the object side and the image side of the first lens 710 to the eighth lens 780 may be aspherical.

[0241] [Table 14]

[0242] In addition, the optical imaging system 700 can have Figure 14 The aberration characteristics shown are illustrated.

[0243] Reference Figure 15 and Figure 16 The optical imaging system 800 is described according to the eighth example.

[0244] The optical imaging system 800 may include an optical system comprising 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, and may also include a filter 890 and an image sensor IS.

[0245] The optical imaging system 800 can form a focal point on the imaging surface 891. The imaging surface 891 can refer to the surface on which the optical imaging system 800 can form a focal point. For example, the imaging surface 891 can refer to a surface of the image sensor IS on which light is received.

[0246] Table 15 lists the lens characteristics of each lens (radius of curvature, lens thickness or distance between lenses, refractive index, Abbe number, and focal length).

[0247] [Table 15]

[0248] The total focal length f of the optical imaging system 800 can be 6.4236mm, the IMG HT can be 6.12mm, and the FOV can be 85.3°.

[0249] In the eighth example, the first lens 810 may have positive refractive power, the first surface of the first lens 810 may be convex, and the second surface of the first lens 810 may be concave.

[0250] The second lens 820 may have negative refractive power, the first surface of the second lens 820 may be convex, and the second surface of the second lens 820 may be concave.

[0251] The third lens 830 may have positive refractive power, the first surface of the third lens 830 may be convex, and the second surface of the third lens 830 may be concave.

[0252] The fourth lens 840 may have positive refractive power, the first surface of the fourth lens 840 may be convex, and the second surface of the fourth lens 840 may be concave.

[0253] The fifth lens 850 may have negative refractive power, the first surface of the fifth lens 850 may be concave, and the second surface of the fifth lens 850 may be convex.

[0254] The sixth lens 860 may have positive refractive power, the first surface of the sixth lens 860 may be convex in the paraxial region, and the second surface of the sixth lens 860 may be concave in the paraxial region.

[0255] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the sixth lens 860. For example, the first surface of the sixth lens 860 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the sixth lens 860 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0256] The seventh lens 870 may have positive refractive power, and the first and second surfaces of the seventh lens 870 may be convex in the paraxial region.

[0257] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the seventh lens 870. For example, the first surface of the seventh lens 870 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the seventh lens 870 may be convex in the paraxial region and concave in the portion other than the paraxial region.

[0258] The eighth lens 880 may have negative refractive power, and the first and second surfaces of the eighth lens 880 may be concave in the paraxial region.

[0259] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the eighth lens 880. For example, the first surface of the eighth lens 880 may be concave in the paraxial region and convex in the portion other than the paraxial region. The second surface of the eighth lens 880 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0260] Each surface of the first lens 810 to the eighth lens 880 may have aspheric coefficients as shown in Table 16. For example, both the object side and the image side of the first lens 810 to the eighth lens 880 may be aspherical.

[0261] [Table 16]

[0262] In addition, the optical imaging system 800 can have Figure 16 The aberration characteristics shown are illustrated.

[0263] [Table 17]

[0264] Based on the above example, optical imaging systems can have a reduced size while achieving high resolution.

[0265] While this disclosure includes specific examples, it will be apparent to those skilled in the art that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be considered descriptive only and not for limiting purposes. The description of features or aspects in each example is to be applied 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 components in the described system, architecture, device, or circuit are combined in different ways and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of this disclosure is not limited by the specific embodiments but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents shall be construed as included in this disclosure.

Claims

1. An optical imaging system, comprising: The first lens has positive refractive power, has a convex object side in its paraxial region and a concave image side in its paraxial region; The second lens has negative refractive power, has a convex object side in its paraxial region and a concave image side in its paraxial region; The third lens has refractive power; The fourth lens has positive refractive power; The fifth lens has negative refractive power; The sixth lens has refractive power; The seventh lens has positive refractive power; as well as The eighth lens has negative refractive power and a concave image-side surface in its paraxial region. The first lens to the eighth lens are arranged sequentially from the object side. The optical imaging system has a total of eight lenses. Among them, the following condition is satisfied: 0 < f7 / f < 2; and -1 < f8 / f < 0, Where f7 is the focal length of the seventh lens, f8 is the focal length of the eighth lens, and f is the total focal length of the optical imaging system.

2. The optical imaging system according to claim 1, wherein, In the first through eighth lenses, at least three lenses, including the second lens, have a refractive index greater than 1.61, and Of the at least three lenses having a refractive index greater than 1.61, the second lens has the smallest absolute value of focal length.

3. The optical imaging system according to claim 1, wherein, At least one of the following conditions must be met: 25 < v1-v2 < 45, and 0 ≤ v1 - v4 < 45, Wherein, 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, The condition 60 < v2 + v5 + v6 < 80 is satisfied, where v2 is the Abbe number of the second lens, v5 is the Abbe number of the fifth lens, and v6 is the Abbe number of the sixth lens.

5. The optical imaging system according to claim 1, wherein, The refractive index of each of the second lens and the fifth lens is greater than 1.

66.

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

7. The optical imaging system according to claim 1, wherein, At least one of the following conditions must be met: -10 < f2 / f < -1, and 1 < |f³ / f| ≤ 155.825, Where f2 is the focal length of the second lens and f3 is the focal length of the third lens.

8. The optical imaging system according to claim 1, wherein, The condition -0.6 < f1 / f2 < 0 is satisfied, where f1 is the focal length of the first lens and f2 is the focal length of the second lens.

9. The optical imaging system according to claim 1, wherein, At least one of the following conditions must be met: 0 < |f2 / f3| < 1, and 3 < |f4 / f| ≤ 12.662, Where f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens.

10. The optical imaging system according to claim 1, wherein, The condition 3 < |f5 / f| ≤ is satisfied. 15.353, where f5 is the focal length of the fifth lens.

11. The optical imaging system according to claim 1, wherein, The condition 1 < |f6 / f| ≤ 26.917 is satisfied, where f6 is the focal length of the sixth lens.

12. The optical imaging system according to claim 1, wherein, At least one of the following conditions must be met: 1.104 ≤ TTL / f < 1.3, and 0.158 ≤ BFL / f < 0.3, where 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.

13. The optical imaging system according to claim 1, wherein, The condition 0 < D1 / f < 0.1 is satisfied, where D1 is the distance on the optical axis from the image side surface of the first lens to the object side surface of the second lens.

14. The optical imaging system according to claim 1, wherein, The condition 70° < FOV×(IMG HT / f) ≤ 83.132° is satisfied, where FOV is the field of view of the optical imaging system, and IMG HT is half of the diagonal length of the imaging surface.

15. The optical imaging system according to claim 1, wherein, The sixth lens has a negative refractive power.

16. The optical imaging system according to claim 1, wherein, The third lens has a convex object side surface in its paraxial region and a concave image side surface in its paraxial region, and The seventh lens has a convex object side surface in its paraxial region and a concave image side surface in its paraxial region.

17. The optical imaging system according to claim 1, wherein, The eighth lens has a convex object side surface in its paraxial region and a concave image side surface in its paraxial region.

18. The optical imaging system according to claim 1, wherein, The fourth lens has a convex object side surface in its paraxial region and a concave image side surface in its paraxial region.

19. The optical imaging system according to claim 1, wherein, The fourth lens has a concave object side surface in its paraxial region and a convex image side surface in its paraxial region, and The fifth lens has a convex object side surface in its paraxial region and a concave image side surface in its paraxial region.

Images