Optical imaging system

Abstract

An optical imaging system comprising a first lens having positive refractive power, a convex object side face and a concave image side face; a second lens having negative refractive power, a convex object side face and a concave image side face; a third lens having positive refractive power and a convex object side face; a fourth lens having negative refractive power, a concave object side face and a concave image side face; a fifth lens having refractive power; a sixth lens having refractive power; and a seventh lens having negative refractive power, wherein the first lens to the seventh lens are arranged in order from the object side, wherein the optical imaging system has a total of seven lenses, and wherein 0 < f1 / f < 1.4, -10 < f2 / f < 0 and 25 < v1-v2 < 45 are satisfied, wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f is the total focal length of the optical imaging system, v1 is the Abbe number of the first lens and v2 is the Abbe number of the second lens.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2021-0166009, filed on November 26, 2021, with the Korean Intellectual Property Office, and Korean Patent Application No. 10-2022-0038123, filed on March 28, 2022, the disclosures of which are incorporated herein by reference in their entirety. Technical Field

[0003] This disclosure relates to optical imaging systems. Background Technology

[0004] Recent portable terminals include cameras equipped with optical imaging systems and multiple lenses to enable video calls and image acquisition.

[0005] Furthermore, as the functionality of cameras in portable terminals gradually increases, the demand for cameras with high resolution for portable terminals is also increasing.

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

[0007] In other words, the size of image sensors has increased, and therefore the overall length of the optical system has also increased, making it possible for the camera to protrude from portable terminal devices, which could be problematic.

[0008] It may be desirable to use optical imaging systems with high resolution and relatively small size in portable terminal devices and cameras. Summary of the Invention

[0009] This summary is provided to present, in a simplified form, the selection of 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 general, the optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially from the object side. The first lens has positive refractive power, and the second lens has negative refractive power. The following conditions are met: TTL / (2×IMG HT) < 0.6 and -0.15 < SAG52 / f < 0, where TTL is the distance along the optical axis from the object side of the first lens to the image plane, IMG HT is half the diagonal length of the image plane, SAG52 is the fifth SAG value at the end of the effective diameter of the image side of the fifth lens, and f is the total focal length of the optical imaging system.

[0011] In an optical imaging system, one or both of the following conditions can be met: -0.15 < SAG62 / f < 0 and -0.25 < SAG72 / f < 0, where SAG62 is the sixth SAG value at the end of the effective diameter of the image-side surface of the sixth lens, and SAG72 is the seventh SAG value at the end of the effective diameter of the image-side surface of the seventh lens.

[0012] In an optical imaging system, at least three of the first to seventh lenses may have a refractive index greater than 1.61.

[0013] In an optical imaging system, each of the lenses with a refractive index greater than 1.61 can have negative refractive power.

[0014] In an optical imaging system, each of the second and fourth lenses can have a refractive index greater than 1.67 and a negative refractive power.

[0015] In an optical imaging system, any one or any combination of two or more of the following conditions can be satisfied: 25 < v1-v2 < 45, 25 < v1-v4 < 45, and 15 < v1-v6 < 25, where v1 is the first Abbe number of the first lens, v2 is the second Abbe number of the second lens, v4 is the fourth Abbe number of the fourth lens, and v6 is the sixth Abbe number of the sixth lens.

[0016] In an optical imaging system, the following conditions can be met: 0 < f1 / f < 1.4 and -10 < f2 / f < 0, where f1 is the first focal length of the first lens and f2 is the second focal length of the second lens.

[0017] In an optical imaging system, the following conditions can be met: 0 < f3 / f < 50 and -50 < f4 / f < 0, where f3 is the third focal length of the third lens and f4 is the fourth focal length of the fourth lens.

[0018] In an optical imaging system, the following conditions can be met: |f5 / f| > 3, 0 < f6 / f < 1.4, and -0.9 < f7 / f < 0, where f5 is the fifth focal length of the fifth lens, f6 is the sixth focal length of the sixth lens, and f7 is the seventh focal length of the seventh lens.

[0019] In an optical imaging system, TTL / f < 1.3 and BFL / f < 0.3 can be satisfied, where BFL is the distance on the optical axis from the image side of the seventh lens to the imaging plane.

[0020] In an optical imaging system, D1 / f < 0.1 can be satisfied, where D1 is the distance on the optical axis between the image-side surface of the first lens and the object-side surface of the second lens.

[0021] In an optical imaging system, the following condition can be met: FOV×((2×IMG HT) / f)≤ 170°, where FOV is the field of view of the optical imaging system.

[0022] In optical imaging systems, the condition (TTL / (2×IMG HT))×(TTL / f) can be satisfied < 0.62.

[0023] In an optical imaging system, the following condition can be satisfied: n2 + n4 + n5 > 4.8, where n2 is the second refractive index of the second lens, n4 is the fourth refractive index of the fourth lens, and n5 is the fifth refractive index of the fifth lens.

[0024] In an optical imaging system, the third lens can have positive refractive power, the fourth lens can have negative refractive power, the fifth lens can have negative refractive power, the sixth lens can have positive refractive power, and the seventh lens can have negative refractive power.

[0025] In an optical imaging system, a first lens may have a convex object-side surface and a concave image-side surface, a second lens may have a convex object-side surface and a concave image-side surface, and a third lens may have a convex object-side surface and a concave image-side surface.

[0026] Other features and aspects will be apparent from the accompanying drawings, claims and the following detailed description. Attached Figure Description

[0027] Figure 1 This is a diagram illustrating an optical imaging system according to a first example embodiment.

[0028] Figure 2 It means Figure 1 The curves showing the aberration characteristics of the optical imaging system are shown.

[0029] Figure 3This is a diagram illustrating an optical imaging system according to a second example embodiment.

[0030] Figure 4 It means Figure 3 The curves showing the aberration characteristics of the optical imaging system are shown.

[0031] Figure 5 This is a diagram illustrating an optical imaging system according to a third example embodiment.

[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 a fourth example embodiment.

[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 a fifth example embodiment.

[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 a sixth example embodiment.

[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 an optical imaging system according to a seventh exemplary embodiment.

[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 an eighth example embodiment.

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

[0043] Figure 17 This is a diagram illustrating an optical imaging system according to a ninth example embodiment.

[0044] Figure 18 It means Figure 17 The curves showing the aberration characteristics of the optical imaging system are shown.

[0045] Figure 19 This is a diagram illustrating an optical imaging system according to a tenth exemplary embodiment.

[0046] Figure 20 It means Figure 19 The curves showing the aberration characteristics of the optical imaging system are shown.

[0047] Throughout the accompanying drawings and detailed description, the same reference numerals refer to the same elements. The drawings may not be drawn to scale, and for clarity, illustration, and convenience, the relative dimensions, scale, and depiction of elements in the drawings may be exaggerated. Detailed Implementation

[0048] The following detailed description is provided to aid the reader in fully understanding 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 apparent after understanding the disclosure of this application. For example, the sequence of operations described herein is merely illustrative and is not limited to the order set forth herein, except for operations that must occur in a specific order, but can be obviously changed after understanding the disclosure of this application. Furthermore, for the sake of clarity and conciseness, descriptions of features known in the art may be omitted.

[0049] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways in which the methods, apparatus, and / or systems described herein will be apparent upon understanding the disclosure of this application.

[0050] 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 can be directly "on," directly "connected to," or directly "attached to" another element, or one or more other elements may exist between them. Conversely, when an element is described as being "directly" "on," "directly connected to," or "directly attached to" another element, no other elements can exist between them.

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

[0052] Although terms such as “first,” “second,” and “third” may be used herein 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, without departing from the teachings of the examples described herein, the first component, first assembly, first region, first layer, or first part mentioned in the examples may also be referred to as a second component, second assembly, second region, second layer, or second part.

[0053] For ease of description, spatial relative terms such as “above,” “above,” “below,” and “below” 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 “below” relative to another element will be “below” or “below” relative to that element. Therefore, the term “above” includes both above and below 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 spatially related terms used herein will be interpreted accordingly.

[0054] 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” indicate the presence of the stated features, numbers, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, components, elements, and / or combinations thereof.

[0055] The features of the examples described herein can be combined in various ways, as will be apparent upon understanding the disclosure of this application. 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.

[0056] In the accompanying drawings illustrating the lens, the thickness, size, and shape of the lens are exaggerated for illustrative purposes, and the spherical or aspherical shapes of the lenses shown in the drawings are examples, and the shapes are not limited to these.

[0057] The first lens refers to the lens closest to the object side, and the seventh lens refers to the lens closest to the imaging plane (or image sensor).

[0058] Furthermore, in each lens, the first surface refers to the surface adjacent to the object side (or the object-side surface), and the second surface refers to the surface adjacent to the image side (or the image-side surface). Additionally, in the example embodiment, 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.

[0059] Furthermore, in the description of the shape of each lens, the concept of a convex surface means that the paraxial region of that surface is convex, the concept of a concave surface means that the paraxial region of that surface is concave, and the concept of a planar surface means that the paraxial region of that surface is planar. Therefore, even when describing a lens surface as convex, the edge portion of the lens can be concave. Similarly, even when describing a lens surface as concave, the edge portion of the lens can be convex. Furthermore, when describing a lens surface as planar, the edge portion of the lens can be either convex or concave.

[0060] The paraxial region refers to the relatively narrow region adjacent to the optical axis.

[0061] An imaging plane can refer to a virtual plane on which an optical imaging system can form a focal point. Alternatively, an imaging plane can refer to a surface of an image sensor on which light is received.

[0062] The optical imaging system in the example embodiment may include seven lenses.

[0063] For 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, and a seventh lens arranged sequentially from the object side. The first lens to the seventh lens may be spaced apart from each other by a predetermined distance along the optical axis.

[0064] However, the optical imaging system in the example embodiment may not simply include seven lenses, and may include other components if necessary.

[0065] For example, an optical imaging system may also include an image sensor, which is used to convert an image of an incident object into an electrical signal.

[0066] In addition, the optical imaging system may also include an infrared filter (hereinafter referred to as the "filter") for blocking infrared light. The filter may be positioned between the seventh lens and the image sensor.

[0067] In addition, optical imaging systems may include apertures for adjusting the amount of light.

[0068] The first to seventh lenses included in the optical imaging system of the example embodiment can be formed of plastic material.

[0069] Furthermore, at least one of the first to seventh lenses has an aspherical surface. Additionally, each of the first to seventh lenses may have at least one aspherical surface.

[0070] In other words, at least one of the first and second surfaces of the first to seventh lenses can be aspherical. In this paper, the aspherical surfaces of the first to seventh lenses are represented by Equation 1.

[0071] [Equation 1]

[0072] In Equation 1, c is the reciprocal of the radius of curvature of the lens, K is the diconic constant, and Y is the distance from a point on the aspherical surface of the lens to the optical axis. Furthermore, constants A to P refer to the aspheric coefficients. Z (SAG) is the distance along the optical axis between a point on the aspherical surface of the lens and the vertex of the aspherical surface.

[0073] The optical imaging system in the example embodiment can satisfy any one or any combination of any two or more of the following conditional expressions:

Conditional Expression 1

Conditional Expression 2

Conditional Expression 3

Conditional Expression 4

Conditional Expression 5

Conditional Expression 6

Conditional Expression 7

Conditional Expression 8

Conditional Expression 9

Conditional Expression 10

Conditional Expression 11

Conditional Expression 12

Conditional Expression 13

Conditional Expression 14

Conditional Expression 15

Conditional Expression 16

Conditional Expression 17

Conditional Expression 18

Conditional Expression 19

Conditional Expression 20

Conditional Expression 21

Conditional Expression 22

[0074] 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, and v6 is the Abbe number of the sixth lens.

[0075] n2 is the refractive index of the second lens, n4 is the refractive index of the fourth lens, and n5 is the refractive index of the fifth lens.

[0076] TTL is the distance on the optical axis from the object side of the first lens to the imaging plane, and BFL is the distance on the optical axis from the image side of the seventh lens to the imaging plane.

[0077] D1 is the distance on the optical axis between the image-side surface of the first lens and the object-side surface of the second lens, IMG HT is half the diagonal length of the imaging plane, and FOV is the field of view of the optical imaging system.

[0078] SAG52 is the SAG value at the end of the effective diameter of the image-side surface of the fifth lens, SAG62 is the SAG value at the end of the effective diameter of the image-side surface of the sixth lens, and SAG72 is the SAG value at the end of the effective diameter of the image-side surface of the seventh lens.

[0079] When the SAG value is negative, this configuration indicates that the end of the effective diameter of the corresponding lens surface is set closer to the object side than the vertex of the corresponding lens surface.

[0080] When the SAG value is positive, this configuration indicates that the end of the effective diameter of the corresponding lens surface is set closer to the image side than the vertex of the corresponding lens surface.

[0081] The first to seventh lenses included in the optical imaging system in the example embodiment will be described.

[0082] 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.

[0083] At least one of the first surface and the second surface of the first lens can be aspherical. For example, both surfaces of the first lens can be aspherical.

[0084] The second lens may have negative refractive power. Furthermore, the second lens may have a meniscus shape that convexes toward the object side. More specifically, the first surface of the second lens may be convex, and the second surface of the second lens may be concave. It should be noted herein that the term "may" is used with respect to examples or embodiments; for example, regarding what an example or embodiment may include or implement, it means that there exists at least one example or embodiment that includes or implements this feature, and that all examples and embodiments are not limited thereto.

[0085] 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.

[0086] The third lens can have positive 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.

[0087] 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.

[0088] The fourth lens can have negative refractive power. Furthermore, the fourth lens can have a meniscus shape that convexes towards the object side. More specifically, the first surface of the fourth lens can be convex, and the second surface of the fourth lens can be concave.

[0089] Alternatively, both surfaces of the fourth lens can be concave. More specifically, the first and second surfaces of the fourth lens can be concave.

[0090] Alternatively, the fourth lens may have a meniscus shape that convexes toward the image side. More specifically, the first surface of the fourth lens may be concave, and the second surface of the fourth lens may be convex.

[0091] At least one of the first and second surfaces of the fourth lens can be aspherical. For example, both surfaces of the fourth lens can be aspherical.

[0092] 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.

[0093] At least one of the first and second surfaces of the fifth lens can be aspherical. For example, both surfaces of the fifth lens can be aspherical.

[0094] The fifth 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 fifth lens may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the fifth lens may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0095] The sixth lens can have positive refractive power. Furthermore, both surfaces of the sixth lens can be convex. More specifically, the first and second surfaces of the sixth lens can be convex in the paraxial region.

[0096] At least one of the first and second surfaces of the sixth lens can be aspherical. For example, both surfaces of the sixth lens can be aspherical.

[0097] 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 the portion other than the paraxial region. The second surface of the sixth lens may be convex in the paraxial region and concave in the portion other than the paraxial region.

[0098] The seventh lens can have negative refractive power. Furthermore, both surfaces of the seventh lens can be concave. More specifically, the first and second surfaces of the seventh lens can be concave in the paraxial region.

[0099] Alternatively, the seventh lens may have a meniscus shape that convexes toward the object side. More specifically, the first surface of the seventh lens may be convex in the paraxial region, and the second surface of the seventh lens may be concave in the paraxial region.

[0100] At least one of the first and second surfaces of the seventh lens can be aspherical. For example, both surfaces of the seventh lens can be aspherical.

[0101] 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 concave in the paraxial region and convex 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.

[0102] Each of the first through seventh lenses may be formed of a plastic material having optical properties different from those of the adjacent lenses.

[0103] Furthermore, at least three of the first to seventh lenses may have a refractive index greater than 1.61. For example, the second, fourth, and fifth lenses may have a refractive index greater than 1.61. Additionally, the lenses among the first to seventh lenses with a refractive index greater than 1.61 may have a negative refractive index. For example, each of the second, fourth, and fifth lenses may have a refractive index greater than 1.61 and may have a negative refractive index.

[0104] Lenses with negative refractive power, from the first to the fourth lens, can have a refractive index greater than 1.67. For example, the second and fourth lenses can have negative refractive power and a refractive index greater than 1.67.

[0105] Reference Figure 1 and Figure 2 An optical imaging system 100 according to a first example embodiment is described.

[0106] The optical imaging system 100 in the first example embodiment may include an optical system, and may also include a filter 180 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 and a seventh lens 170.

[0107] The optical imaging system 100 in the first example embodiment can form a focal point on the imaging surface 190. The imaging surface 190 can refer to a surface on which the optical imaging system can form a focal point. For example, the imaging surface 190 can refer to a surface of an image sensor IS that receives light.

[0108] 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).

[0109] Table 1

[0110] In the first example embodiment, the total focal length f of the optical imaging system 100 can be 7.48 mm, the IMG HT can be 7.145 mm, and the FOV can be 85°.

[0111] In a first example embodiment, 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.

[0112] 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.

[0113] The third lens 130 may have positive 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.

[0114] The fourth lens 140 may have negative refractive power, the first surface of the fourth lens 140 may be convex, and the second surface of the fourth lens 140 may be concave.

[0115] The fifth lens 150 may have negative refractive power, the first surface of the fifth lens 150 may be convex in the paraxial region, and the second surface of the fifth lens 150 may be concave in the paraxial region.

[0116] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the fifth lens 150. For example, the first surface of the fifth lens 150 may be convex in the paraxial region and concave in the portion other than the paraxial region. Similarly, the second surface of the fifth lens 150 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0117] The sixth lens 160 may have positive refractive power, and the first and second surfaces of the sixth lens 160 may be convex in the paraxial region.

[0118] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces 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 convex in the paraxial region and concave in the portion other than the paraxial region.

[0119] The seventh lens 170 may have negative refractive power, and the first and second surfaces of the seventh lens 170 may be concave in the paraxial region.

[0120] 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 concave in the paraxial region and convex 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.

[0121] Each surface of the first lens 110 to the seventh lens 170 may have an aspheric coefficient as shown in Table 2. For example, the object-side surface and the image-side surface of the first lens 110 to the seventh lens 170 may both be aspherical.

[0122] Table 2

[0123] Furthermore, the optical imaging system configured as described above can have, for example... Figure 2 The aberration characteristics shown are illustrated.

[0124] Reference Figure 3 and Figure 4 An optical imaging system 200 according to a second example embodiment is described.

[0125] The optical imaging system 200 in the second example embodiment may include an optical system, and may also include a filter 280 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 and a seventh lens 270.

[0126] In the second example embodiment, the optical imaging system 200 can form a focal point on the imaging surface 290. The imaging surface 290 can refer to a surface on which the optical imaging system can form a focal point. For example, the imaging surface 290 can refer to a surface of an image sensor IS that receives light.

[0127] 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).

[0128] Table 3

[0129] In the second example embodiment, the total focal length f of the optical imaging system 200 can be 7.48 mm, the IMG HT can be 7.145 mm, and the FOV can be 85°.

[0130] In the second example embodiment, 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.

[0131] 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.

[0132] 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.

[0133] The fourth lens 240 may have negative refractive power, the first surface of the fourth lens 240 may be convex, and the second surface of the fourth lens 240 may be concave.

[0134] The fifth lens 250 may have negative refractive power, the first surface of the fifth lens 250 may be convex in the paraxial region, and the second surface of the fifth lens 250 may be concave in the paraxial region.

[0135] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the fifth lens 250. For example, the first surface of the fifth lens 250 may be convex in the paraxial region and concave in the portion other than the paraxial region. Similarly, the second surface of the fifth lens 250 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0136] The sixth lens 260 may have positive refractive power, and the first and second surfaces of the sixth lens 260 may be convex 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 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 convex in the paraxial region and concave in the portion other than the paraxial region.

[0138] The seventh lens 270 may have negative refractive power, and the first and second surfaces of the seventh lens 270 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 seventh lens 270. For example, the first surface of the seventh lens 270 may be concave in the paraxial region and convex 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.

[0140] Each surface of the first lens 210 to the seventh lens 270 may have an aspheric coefficient as shown in Table 4. For example, the object-side surface and the image-side surface of the first lens 210 to the seventh lens 270 may both be aspherical.

[0141] Table 4

[0142] Furthermore, the optical imaging system configured as described above can have, for example... Figure 4 The aberration characteristics shown are illustrated.

[0143] Reference Figure 5 and Figure 6 An optical imaging system 300 according to a third example embodiment is described.

[0144] The optical imaging system 300 in the third example embodiment may include an optical system, and may also include a filter 380 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 and a seventh lens 370.

[0145] In the third example embodiment, the optical imaging system 300 can form a focal point on the imaging surface 390. The imaging surface 390 can refer to a surface on which the optical imaging system can form a focal point. For example, the imaging surface 390 can refer to a surface of an image sensor IS that receives light.

[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] In the third example embodiment, the total focal length f of the optical imaging system 300 can be 7.48 mm, the IMG HT can be 7.145 mm, and the FOV can be 86°.

[0149] In the third example embodiment, 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 negative refractive power, and the first and second surfaces of the fourth lens 340 may be concave.

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

[0154] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the fifth lens 350. For example, the first surface of the fifth lens 350 may be convex in the paraxial region and concave in the portion other than the paraxial region. Similarly, the second surface of the fifth lens 350 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0155] The sixth lens 360 may have positive refractive power, and the first and second surfaces of the sixth lens 360 may be convex in the paraxial region.

[0156] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces 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 convex in the paraxial region and concave in the portion other than the paraxial region.

[0157] The seventh lens 370 may have negative refractive power, and the first and second surfaces of the seventh lens 370 may be concave in the paraxial region.

[0158] 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 concave in the paraxial region and convex 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.

[0159] Each surface of the first lens 310 to the seventh lens 370 may have an aspherical coefficient as shown in Table 6. For example, the object-side surface and the image-side surface of the first lens 310 to the seventh lens 370 may both be aspherical.

[0160] Table 6

[0161] Furthermore, the optical imaging system configured as described above can have, for example... Figure 6 The aberration characteristics shown are illustrated.

[0162] Reference Figure 7 and Figure 8 An optical imaging system 400 according to a fourth example embodiment is described.

[0163] The optical imaging system 400 in the fourth example embodiment may include an optical system and may also include a filter 480 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 and a seventh lens 470.

[0164] In the fourth example embodiment, the optical imaging system 400 can form a focal point on the imaging surface 490. The imaging surface 490 can refer to a surface on which the optical imaging system can form a focal point. For example, the imaging surface 490 can refer to a surface of an image sensor IS that receives light.

[0165] 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).

[0166] Table 7

[0167] In the fourth example embodiment, the total focal length f of the optical imaging system 400 can be 7.48 mm, the IMG HT can be 7.145 mm, and the FOV can be 85.5°.

[0168] In the fourth example embodiment, 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.

[0169] 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.

[0170] 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.

[0171] The fourth lens 440 may have negative 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.

[0172] The fifth lens 450 may have negative refractive power, the first surface of the fifth lens 450 may be convex in the paraxial region, and the second surface of the fifth lens 450 may be concave in the paraxial region.

[0173] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the fifth lens 450. For example, the first surface of the fifth lens 450 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the fifth lens 450 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0174] The sixth lens 460 may have positive refractive power, and the first and second surfaces of the sixth lens 460 may be convex 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. Similarly, the second surface of the sixth lens 460 may be convex in the paraxial region and concave in the portion other than the paraxial region.

[0176] The seventh lens 470 may have negative refractive power, and the first and second surfaces 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 concave in the paraxial region and convex 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] Each surface of the first lens 410 to the seventh lens 470 may have an aspheric coefficient as shown in Table 8. For example, the object-side surface and the image-side surface of the first lens 410 to the seventh lens 470 may both be aspherical.

[0179] Table 8

[0180] Furthermore, the optical imaging system configured as described above can have, for example... Figure 8 The aberration characteristics shown are illustrated.

[0181] Reference Figure 9 and Figure 10 An optical imaging system 500 according to a fifth example embodiment is described.

[0182] The optical imaging system 500 in the fifth example embodiment may include an optical system and may also include a filter 580 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 and a seventh lens 570.

[0183] In the fifth example embodiment, the optical imaging system 500 can form a focal point on the imaging surface 590. The imaging surface 590 can refer to a surface on which the optical imaging system can form a focal point. For example, the imaging surface 590 can refer to a surface of an image sensor IS that receives light.

[0184] 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).

[0185] Table 9

[0186] In the fifth example embodiment, the total focal length f of the optical imaging system 500 can be 7.48 mm, the IMG HT can be 7.145 mm, and the FOV can be 85.3°.

[0187] In the fifth example embodiment, 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.

[0188] 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.

[0189] 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.

[0190] The fourth lens 540 may have negative refractive power, and the first and second surfaces of the fourth lens 540 may be concave.

[0191] The fifth lens 550 may have negative refractive power, the first surface of the fifth lens 550 may be convex in the paraxial region, and the second surface of the fifth lens 550 may be concave in the paraxial region.

[0192] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the fifth lens 550. For example, the first surface of the fifth lens 550 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the fifth lens 550 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0193] The sixth lens 560 may have positive refractive power, and the first and second surfaces of the sixth lens 560 may be convex in the paraxial region.

[0194] 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 convex in the paraxial region and concave in the portion other than the paraxial region.

[0195] The seventh lens 570 may have negative refractive power, and the first and second surfaces of the seventh lens 570 may be concave in the paraxial region.

[0196] 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 concave in the paraxial region and convex in the portion other than the paraxial region. The second surface of the seventh lens 570 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0197] Each surface of the first lens 510 to the seventh lens 570 may have an aspherical coefficient as shown in Table 10. For example, the object-side surface and the image-side surface of the first lens 510 to the seventh lens 570 may both be aspherical.

[0198] Table 10

[0199] Furthermore, the optical imaging system configured as described above can have, for example... Figure 10 The aberration characteristics shown are illustrated.

[0200] Reference Figure 11 and Figure 12 An optical imaging system 600 according to a sixth example embodiment is described.

[0201] The optical imaging system 600 in the sixth example embodiment may include an optical system, and may also include a filter 680 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 and a seventh lens 670.

[0202] In the sixth example embodiment, the optical imaging system 600 can form a focal point on the imaging surface 690. The imaging surface 690 can refer to a surface on which the optical imaging system can form a focal point. For example, the imaging surface 690 can refer to a surface of an image sensor IS that receives light.

[0203] 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).

[0204] Table 11

[0205] In the sixth example embodiment, the total focal length f of the optical imaging system 600 can be 7.48 mm, the IMG HT can be 7.145 mm, and the FOV can be 85°.

[0206] In the sixth example embodiment, 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.

[0207] 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.

[0208] The third lens 630 may have positive 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.

[0209] The fourth lens 640 may have negative refractive power, and the first and second surfaces of the fourth lens 640 may be concave.

[0210] The fifth lens 650 may have negative refractive power, the first surface of the fifth lens 650 may be convex in the paraxial region, and the second surface of the fifth lens 650 may be concave in the paraxial region.

[0211] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the fifth lens 650. For example, the first surface of the fifth lens 650 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the fifth lens 650 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0212] The sixth lens 660 may have positive refractive power, and the first and second surfaces of the sixth lens 660 may be convex in the paraxial region.

[0213] 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 convex in the paraxial region and concave in the portion other than the paraxial region.

[0214] The seventh lens 670 may have negative refractive power, and the first and second surfaces of the seventh lens 670 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 seventh lens 670. For example, the first surface of the seventh lens 670 may be concave in the paraxial region and convex 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.

[0216] Each surface of the first lens 610 to the seventh lens 670 may have an aspheric coefficient as shown in Table 12. For example, the object-side surface and the image-side surface of the first lens 610 to the seventh lens 670 may both be aspherical.

[0217] Table 12

[0218] Furthermore, the optical imaging system configured as described above can have, for example... Figure 12 The aberration characteristics shown are illustrated.

[0219] Reference Figure 13 and Figure 14 An optical imaging system 700 according to a seventh example embodiment is described.

[0220] The optical imaging system 700 in the seventh example embodiment may include an optical system and may also include a filter 780 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 and a seventh lens 770.

[0221] In the seventh example embodiment, the optical imaging system 700 can form a focal point on the imaging surface 790. The imaging surface 790 can refer to the surface on which the optical imaging system can form a focal point. For example, the imaging surface 790 can refer to a surface of an image sensor IS that receives light.

[0222] 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).

[0223] Table 13

[0224] In the seventh example embodiment, the total focal length f of the optical imaging system 700 can be 7.48 mm, the IMG HT can be 7.145 mm, and the FOV can be 86.8°.

[0225] In the seventh example embodiment, 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.

[0226] 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.

[0227] The third lens 730 may have positive 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.

[0228] The fourth lens 740 may have negative refractive power, and the first and second surfaces of the fourth lens 740 may be concave.

[0229] The fifth lens 750 may have negative refractive power, the first surface of the fifth lens 750 may be convex in the paraxial region, and the second surface of the fifth lens 750 may be concave in the paraxial region.

[0230] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the fifth lens 750. For example, the first surface of the fifth lens 750 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the fifth lens 750 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0231] The sixth lens 760 may have positive refractive power, and the first and second surfaces of the sixth lens 760 may be convex in the paraxial region.

[0232] 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 convex in the paraxial region and concave in the portion other than the paraxial region.

[0233] The seventh lens 770 may have negative refractive power, and the first and second surfaces of the seventh lens 770 may be concave in the paraxial region.

[0234] 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 concave in the paraxial region and convex 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.

[0235] Each surface of the first lens 710 to the seventh lens 770 may have an aspheric coefficient as shown in Table 14. For example, the object-side surface and the image-side surface of the first lens 710 to the seventh lens 770 may both be aspherical.

[0236] Table 14

[0237] Furthermore, the optical imaging system configured as described above can have, for example... Figure 14 The aberration characteristics shown are illustrated.

[0238] Reference Figure 15 and Figure 16 An optical imaging system 800 according to an eighth example embodiment is described.

[0239] The optical imaging system 800 in the eighth example embodiment may include an optical system and may also include a filter 880 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 and a seventh lens 870.

[0240] In the eighth example embodiment, the optical imaging system 800 can form a focal point on the imaging surface 890. The imaging surface 890 can refer to a surface on which the optical imaging system can form a focal point. For example, the imaging surface 890 can refer to a surface of an image sensor IS that receives light.

[0241] 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).

[0242] Table 15

[0243] In the eighth example embodiment, the total focal length f of the optical imaging system 800 can be 7.48 mm, the IMG HT can be 7.145 mm, and the FOV can be 86.8°.

[0244] In the eighth example embodiment, 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.

[0245] 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.

[0246] 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.

[0247] The fourth lens 840 may have negative refractive power, and the first and second surfaces of the fourth lens 840 may be concave.

[0248] The fifth lens 850 may have negative refractive power, the first surface of the fifth lens 850 may be convex in the paraxial region, and the second surface of the fifth lens 850 may be concave in the paraxial region.

[0249] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the fifth lens 850. For example, the first surface of the fifth lens 850 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the fifth lens 850 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0250] The sixth lens 860 may have positive refractive power, and the first and second surfaces of the sixth lens 860 may be convex in the paraxial region.

[0251] 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 convex in the paraxial region and concave in the portion other than the paraxial region.

[0252] The seventh lens 870 may have negative refractive power, and the first and second surfaces of the seventh lens 870 may be concave in the paraxial region.

[0253] 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 concave in the paraxial region and convex in the portion other than the paraxial region. The second surface of the seventh lens 870 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0254] Each surface of the first lens 810 to the seventh lens 870 may have an aspheric coefficient as shown in Table 16. For example, the object-side surface and the image-side surface of the first lens 810 to the seventh lens 870 may both be aspherical.

[0255] Table 16

[0256] Furthermore, the optical imaging system configured as described above can have, for example... Figure 16 The aberration characteristics shown are illustrated.

[0257] Reference Figure 17 and Figure 18 An optical imaging system 900 according to a ninth example embodiment is described.

[0258] The optical imaging system 900 in the ninth example embodiment may include an optical system and may also include a filter 980 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 and a seventh lens 970.

[0259] In the ninth example embodiment, the optical imaging system 900 can form a focal point on the imaging surface 990. The imaging surface 990 can refer to a surface on which the optical imaging system can form a focal point. For example, the imaging surface 990 can refer to a surface of an image sensor IS that receives light.

[0260] Table 17 lists the lens characteristics of each lens (radius of curvature, lens thickness or distance between lenses, refractive index, Abbe number, and focal length).

[0261] Table 17

[0262] In the ninth example embodiment, the total focal length f of the optical imaging system 900 can be 4.807 mm, the IMG HT can be 4.807 mm, and the FOV can be 85°.

[0263] In the ninth example embodiment, the first lens 910 may have positive refractive power, the first surface of the first lens 910 may be convex, and the second surface of the first lens 910 may be concave.

[0264] The second lens 920 may have negative refractive power, the first surface of the second lens 920 may be convex, and the second surface of the second lens 920 may be concave.

[0265] The third lens 930 may have positive refractive power, the first surface of the third lens 930 may be convex, and the second surface of the third lens 930 may be concave.

[0266] The fourth lens 940 may have negative refractive power, the first surface of the fourth lens 940 may be convex, and the second surface of the fourth lens 940 may be concave.

[0267] The fifth lens 950 may have negative refractive power, the first surface of the fifth lens 950 may be convex in the paraxial region, and the second surface of the fifth lens 950 may be concave in the paraxial region.

[0268] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the fifth lens 950. For example, the first surface of the fifth lens 950 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the fifth lens 950 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0269] The sixth lens 960 may have positive refractive power, and the first and second surfaces of the sixth lens 960 may be convex in the paraxial region.

[0270] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the sixth lens 960. For example, the first surface of the sixth lens 960 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the sixth lens 960 may be convex in the paraxial region and concave in the portion other than the paraxial region.

[0271] The seventh lens 970 can have negative refractive power, the first surface of the seventh lens 970 can be convex in the paraxial region, and the second surface of the seventh lens 970 can be concave in the paraxial region.

[0272] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the seventh lens 970. For example, the first surface of the seventh lens 970 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the seventh lens 970 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0273] Each surface of the first lens 910 to the seventh lens 970 may have an aspheric coefficient as shown in Table 18. For example, the object-side surface and the image-side surface of the first lens 910 to the seventh lens 970 may both be aspherical.

[0274] Table 18

[0275] Furthermore, the optical imaging system configured as described above can have, for example... Figure 18 The aberration characteristics shown are illustrated.

[0276] Reference Figure 19 and Figure 20 An optical imaging system 1000 according to a tenth example embodiment is described.

[0277] The optical imaging system 1000 in the tenth example embodiment may include an optical system, and may also include a filter 1080 and an image sensor IS, wherein the optical system includes a first lens 1010, a second lens 1020, a third lens 1030, a fourth lens 1040, a fifth lens 1050, a sixth lens 1060 and a seventh lens 1070.

[0278] In the tenth example embodiment, the optical imaging system 1000 can form a focal point on the imaging surface 1090. The imaging surface 1090 can refer to a surface on which the optical imaging system can form a focal point. For example, the imaging surface 1090 can refer to a surface of an image sensor IS that receives light.

[0279] Table 19 lists the lens characteristics of each lens (radius of curvature, lens thickness or distance between lenses, refractive index, Abbe number, and focal length).

[0280] Table 19

[0281] In the tenth example embodiment, the total focal length f of the optical imaging system 1000 can be 5.402 mm, the IMG HT can be 5.402 mm, and the FOV can be 85°.

[0282] In the tenth example embodiment, the first lens 1010 may have positive refractive power, the first surface of the first lens 1010 may be convex, and the second surface of the first lens 1010 may be concave.

[0283] The second lens 1020 may have negative refractive power, the first surface of the second lens 1020 may be convex, and the second surface of the second lens 1020 may be concave.

[0284] The third lens 1030 may have positive refractive power, the first surface of the third lens 1030 may be convex, and the second surface of the third lens 1030 may be concave.

[0285] The fourth lens 1040 may have negative refractive power, the first surface of the fourth lens 1040 may be convex, and the second surface of the fourth lens 1040 may be concave.

[0286] The fifth lens 1050 may have negative refractive power, the first surface of the fifth lens 1050 may be convex in the paraxial region, and the second surface of the fifth lens 1050 may be concave in the paraxial region.

[0287] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the fifth lens 1050. For example, the first surface of the fifth lens 1050 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the fifth lens 1050 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0288] The sixth lens 1060 may have positive refractive power, and the first and second surfaces of the sixth lens 1060 may be convex in the paraxial region.

[0289] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the sixth lens 1060. For example, the first surface of the sixth lens 1060 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the sixth lens 1060 may be convex in the paraxial region and concave in the portion other than the paraxial region.

[0290] The seventh lens 1070 may have negative refractive power, the first surface of the seventh lens 1070 may be convex in the paraxial region, and the second surface of the seventh lens 1070 may be concave in the paraxial region.

[0291] Furthermore, at least one inflection point may be formed on at least one of the first and second surfaces of the seventh lens 1070. For example, the first surface of the seventh lens 1070 may be convex in the paraxial region and concave in the portion other than the paraxial region. The second surface of the seventh lens 1070 may be concave in the paraxial region and convex in the portion other than the paraxial region.

[0292] Each surface of the first lens 1010 to the seventh lens 1070 may have an aspheric coefficient as shown in Table 20. For example, the object-side surface and the image-side surface of the first lens 1010 to the seventh lens 1070 may both be aspherical.

[0293] Table 20

[0294] Furthermore, the optical imaging system configured as described above can have, for example... Figure 20 The aberration characteristics shown are illustrated.

[0295] According to the above example embodiments, the optical imaging system can have a reduced size while achieving high resolution.

[0296] While this disclosure includes specific examples, it will be apparent upon understanding the disclosure of this application that various changes in form and detail may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be understood in a descriptive sense only and not for purposes of limitation. The description of a feature or aspect in each example will 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 by other components or their equivalents. Therefore, the scope of this disclosure is not defined by the detailed description but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents will be construed as included in this disclosure.

Claims

1. An optical imaging system, comprising: A first lens having a positive refractive power, a convex object side surface, and a concave image side surface; A second lens having a negative refractive power, a convex object side surface, and a concave image side surface; A third lens having a positive refractive power and a convex object side surface; A fourth lens having a negative refractive power, a concave object side surface, and a concave image side surface; A fifth lens having a refractive power; A sixth lens having a refractive power; and A seventh lens having a negative refractive power, wherein the first lens to the seventh lens are sequentially arranged from the object side, wherein the optical imaging system has a total of seven lenses, and where 0 < f1 / f < 1.4, -10 < f2 / f < 0, and 25 < v1 - v2 < 45, where f1 is the focal length of the first lens, f2 is the focal length of the second lens, f is the total focal length of the optical imaging system, v1 is the Abbe number of the first lens, and v2 is the Abbe number of the second lens.

2. The optical imaging system according to claim 1, wherein -0.15 < SAG52 / f < 0, wherein, SAG52 is the SAG value at the end of the effective diameter of the image side surface of the fifth lens.

3. The optical imaging system according to claim 1, wherein, Satisfy one or both of -0.15 < SAG62 / f < 0 and -0.25 < SAG72 / f < 0, where SAG62 is the SAG value at the end of the effective diameter of the image side surface of the sixth lens, and SAG72 is the SAG value at the end of the effective diameter of the image side surface of the seventh lens.

4. The optical imaging system according to claim 1, wherein, At least three of the first lens to the seventh lens have a refractive index greater than 1.

61.

5. The optical imaging system according to claim 4, wherein, Each of the lenses having a refractive index greater than 1.61 has a negative refractive power.

6. The optical imaging system according to claim 1, wherein, Each of the second lens and the fourth lens has a refractive index greater than 1.

67.

7. The optical imaging system according to claim 1, wherein, Satisfy one or more of 25 < v1 - v4 < 45 and 15 < v1 - v6 < 25, where v4 is the Abbe number of the fourth lens, and v6 is the Abbe number of the sixth lens.

8. The optical imaging system according to claim 1, wherein, Satisfy -0.6 < f1 / f2 < 0.

9. The optical imaging system according to claim 1, wherein, Satisfy 0 < f3 / f < 50 and -50 < f4 / f < 0, where 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, Satisfy |f5 / f| > 3, where f5 is the focal length of the fifth lens.

11. The optical imaging system according to claim 1, wherein, Satisfy 0 < f6 / f < 1.4, where f6 is the focal length of the sixth lens.

12. The optical imaging system according to claim 1, wherein, Satisfy -0.9 < f7 / f < 0, where f7 is the focal length of the seventh lens.

13. The optical imaging system according to claim 1, wherein, Satisfy TTL / f < 1.3, where TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface.

14. The optical imaging system according to claim 1, wherein, Satisfy BFL / f < 0.3, where BFL is the distance on the optical axis from the image side surface of the seventh lens to the imaging surface.

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

16. The optical imaging system according to claim 1, wherein, The condition TTL / (2×IMG HT) < 0.6 is satisfied, where TTL is the distance on the optical axis from the object side of the first lens to the imaging surface, and IMG HT is half the diagonal length of the imaging surface.

17. The optical imaging system according to claim 1, wherein, The following condition must be met: FOV×((2×IMG HT) / f) ≤ 170°, where FOV is the field of view of the optical imaging system and IMG HT is half the diagonal length of the imaging plane.

18. The optical imaging system according to claim 1, wherein, The condition is satisfied that (TTL / (2×IMG HT))×(TTL / f) <0.62, where TTL is the distance on the optical axis from the object side of the first lens to the imaging surface, and IMG HT is half the diagonal length of the imaging surface.

19. The optical imaging system according to claim 1, wherein, The refractive index n2 + n4 + n5 > 4.8 is satisfied, where n2 is the refractive index of the second lens, n4 is the refractive index of the fourth lens, and n5 is the refractive index of the fifth lens.

Images