Optical imaging system

Abstract

An optical imaging system is provided. The optical imaging system includes: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially arranged from the object side to the image side. The first lens has a positive refractive power, and the second lens has a negative refractive power, and TTL / (2×IMG HT)<0.6 and -0.1<SAG42 / TTL<0 are satisfied, where TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface, IMG HT is equal to half of the diagonal length of the imaging surface, and SAG42 is the SAG value at the end of the effective aperture of the image side surface of the fourth lens.

Description

[0001] Cross - reference to related applications

[0002] This application claims the benefit of priority to Korean Patent Application Nos. 10 - 2021 - 0091183, filed with the Korean Intellectual Property Office on July 12, 2021, and 10 - 2021 - 0176902, filed with the Korean Intellectual Property Office on December 10, 2021, the entire disclosure of which is incorporated herein by reference for all purposes. Technical field

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

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

[0005] As the operations performed by the camera included in the portable terminal gradually increase, the demand for a portable terminal including a high - resolution camera increases.

[0006] An image sensor having a high pixel count (e.g., 13 million to 100 million pixels, etc.) may be used in a camera implemented in a portable terminal to achieve improved image quality.

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

[0008] The above information is presented only as background information to aid in obtaining an understanding of the present disclosure. No determination or assertion is made as to whether any of the above is suitable as prior art for the present disclosure. Summary of the invention

[0009] The Summary of the Invention section is provided to introduce, in a simplified form, a selection of concepts that will be further described in the Detailed Description section below. The Summary of the Invention section is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to assist in determining 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 in sequence from the object side to the image side, where: the first lens has a positive refractive power, and the second lens has a negative refractive power, where: TTL / (2×IMG HT)<0.6 and -0.1<SAG42 / TTL<0 are satisfied, where TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface, IMG HT is equal to half of the diagonal length of the imaging surface, and SAG42 is the sagittal height (SAG) value at the end of the effective aperture of the image side surface of the fourth lens.

[0011] At least one of -0.2<SAG52 / TTL<0, -0.2<SAG62 / TTL<0, and -0.3<SAG72 / TTL<0 can be satisfied, where SAG52 is the SAG value at the end of the effective aperture of the image side surface of the fifth lens, SAG62 is the SAG value at the end of the effective aperture of the image side surface of the sixth lens, and SAG72 is the SAG value at the end of the effective aperture of the image side surface of the seventh lens.

[0012] At least one of 25<v1 - v2<45, 25<v1 - v4<45, and 15<v1 - v6<25 can be satisfied, 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, and v6 is the Abbe number of the sixth lens.

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

[0014] -7<f2 / f<-1 can be satisfied, where f is the total focal length of the optical imaging system, and f2 is the focal length of the second lens.

[0015] 1<f3 / f<6 can be satisfied, where f is the total focal length of the optical imaging system, and f3 is the focal length of the third lens.

[0016] -50<f4 / f<0 can be satisfied, where f is the total focal length of the optical imaging system, and f4 is the focal length of the fourth lens.

[0017] 0<|f5 / f| / 100<3 can be satisfied, where f is the total focal length of the optical imaging system, and f5 is the focal length of the fifth lens.

[0018] 0<f6 / f<5 can be satisfied, where f is the total focal length of the optical imaging system, and f6 is the focal length of the sixth lens.

[0019] It can satisfy -3 < f7 / f < 0, where f is the total focal length of the optical imaging system and f7 is the focal length of the seventh lens.

[0020] It can satisfy TTL / f < 1.3 and BFL / f < 0.3, where f is the total focal length of the optical imaging system and BFL is the distance on the optical axis from the image side surface of the seventh lens to the imaging surface.

[0021] It can 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.

[0022] It can satisfy FOV × (IMG HT / f) > 70°, where f is the total focal length of the optical imaging system and FOV is the field of view of the optical imaging system.

[0023] It can satisfy n2 + n4 + n5 > 4.8, 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.

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

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

[0026] Generally, 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 in sequence from the object side to the image side, where at least one of -0.1 < SAG42 / TTL < 0, -0.2 < SAG52 / TTL < 0, -0.2 < SAG62 / TTL < 0, and -0.3 < SAG72 / TTL < 0 is satisfied, where TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface, SAG42 is the SAG value at the end of the effective aperture of the image side surface of the fourth lens, SAG52 is the SAG value at the end of the effective aperture of the image side surface of the fifth lens, SAG62 is the SAG value at the end of the effective aperture of the image side surface of the sixth lens, and SAG72 is the SAG value at the end of the effective aperture of the image side surface of the seventh lens.

[0027] At least one inflection point can be provided on at least one of the first surface and the second surface of each of the fifth lens, the sixth lens, and the seventh lens.

[0028] It can satisfy BFL / f < 0.3, where f is the total focal length of the optical imaging system, and BFL is the distance on the optical axis from the image side of the seventh lens to the imaging surface.

[0029] Other features and aspects will be apparent from the following detailed description, the accompanying drawings, and the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a diagram showing an exemplary optical imaging system according to a first exemplary embodiment.

[0031] Figure 2 is a diagram showing Figure 1 the aberration characteristics of the exemplary optical imaging system shown.

[0032] Figure 3 is a diagram showing an exemplary optical imaging system according to a second exemplary embodiment.

[0033] Figure 4 is a diagram showing Figure 3 the aberration characteristics of the exemplary optical imaging system shown.

[0034] Figure 5 is a diagram showing an exemplary optical imaging system according to a third exemplary embodiment.

[0035] Figure 6 is a diagram showing Figure 5 the aberration characteristics of the exemplary optical imaging system shown.

[0036] Figure 7 is a diagram showing an exemplary optical imaging system according to a fourth exemplary embodiment.

[0037] Figure 8 is a diagram showing Figure 7 the aberration characteristics of the exemplary optical imaging system shown.

[0038] Figure 9 is a diagram showing an exemplary optical imaging system according to a fifth exemplary embodiment.

[0039] Figure 10 is a diagram showing Figure 9 the aberration characteristics of the exemplary optical imaging system shown.

[0040] Figure 11 is a diagram showing an exemplary optical imaging system according to a sixth exemplary embodiment.

[0041] Figure 12 is a diagram showing Figure 11 the aberration characteristics of the exemplary optical imaging system shown.

[0042] Figure 13 FIG. is a diagram showing an exemplary optical imaging system according to a seventh exemplary embodiment.

[0043] Figure 14 is a diagram showing Figure 13 the aberration characteristics of the exemplary optical imaging system shown.

[0044] Figure 15 FIG. is a diagram showing an exemplary optical imaging system according to an eighth exemplary embodiment.

[0045] Figure 16 is a diagram showing Figure 15 the aberration characteristics of the exemplary optical imaging system shown.

[0046] Figure 17 FIG. is a diagram showing an exemplary optical imaging system according to a ninth exemplary embodiment.

[0047] Figure 18 is a diagram showing Figure 17 the aberration characteristics of the exemplary optical imaging system shown.

[0048] Figure 19 FIG. is a diagram showing an exemplary optical imaging system according to a tenth exemplary embodiment.

[0049] Figure 20 is a diagram showing Figure 19 the aberration characteristics of the exemplary optical imaging system shown.

[0050] Throughout the drawings and the detailed description, the same reference numerals denote the same elements. The drawings may not be drawn to scale, and the relative sizes, proportions, and descriptions of the elements in the drawings may be exaggerated for clarity, illustration, and convenience. DETAILED DESCRIPTION

[0051] The following detailed description is provided to assist the reader in obtaining a comprehensive understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of the operations described herein is merely exemplary, except for operations that must occur in a specific order, and is not limited to the order set forth herein, but rather may be changed in a manner that will be apparent after understanding the disclosure of this application. Additionally, descriptions of features known after understanding the disclosure of this application may be omitted for increased clarity and conciseness, noting that the omission of features and their descriptions is not intended to admit their status as common knowledge.

[0052] The features described herein can be implemented in various forms and should not be construed as limited to the examples described herein. Instead, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, devices, and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0053] In this document, it should be noted that the use of the phrase "can" with respect to an embodiment or example (e.g., with respect to what an embodiment or example may include or implement) means that there is at least one embodiment or example in which such a feature is included or implemented, and all embodiments and examples are not limited thereto.

[0054] Throughout the specification, when an element such as a layer, region, or substrate is described as being "on," "connected to," or "coupled to" another element, the element can be directly "on," directly "connected to," or directly "coupled to" the other element, or there can be one or more other elements between the element and the other element. Conversely, when an element is described as being "directly on," "directly connected to," or "directly coupled to" another element, there are no other elements between the element and the other element.

[0055] As used herein, the phrase "and / or" includes any one of the associated listed items and any combination of any two or more of them.

[0056] Although the terms such as "first," "second," and "third" may be used herein to describe various components, elements, regions, layers, or parts, these components, elements, regions, layers, or parts are not limited by these terms. Rather, these terms are only used to distinguish one component, element, region, layer, or part from another. Thus, without departing from the teachings of the examples described herein, the first component, first element, first region, first layer, or first part mentioned in the examples can also be referred to as the second component, second element, second region, second layer, or second part.

[0057] Spatial relative terms such as "above", "upper", "below", and "lower" may be used herein for convenience of description to describe the relationship of one element relative to another as shown in the figures. These spatial relative terms are intended to cover different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "above" or "upper" relative to another element will be "below" or "lower" relative to that other element. Thus, the term "above" encompasses both the orientation of "above" and "below" 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 should be interpreted accordingly.

[0058] The terms used herein are for the purpose of describing various examples only and are not intended to limit the disclosure. Unless the context clearly dictates otherwise, the articles "a", "an", and "the" are intended to include the plural forms as well. The terms "comprising", "including", and "having" specify 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.

[0059] Due to manufacturing techniques and / or tolerances, the shapes shown in the figures may vary. Accordingly, the examples described herein are not limited to the specific shapes shown in the figures but include shape variations that occur during manufacturing.

[0060] The features of the examples described herein may be combined in various ways, which will be apparent after obtaining an understanding of the disclosure of this application. In addition, although the examples described herein have various configurations, it will be apparent after obtaining an understanding of the disclosure of this application that other configurations are possible.

[0061] Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains after understanding the disclosure of this application. Terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the disclosure of this application, and should not be interpreted as idealized or overly formal unless expressly so defined herein.

[0062] In the following, one or more examples will be described with reference to the figures as follows.

[0063] One or more examples provide an optical imaging system that can achieve high resolution and can have a reduced overall length.

[0064] In the lens diagrams, the thickness, size, and shape of the lenses are exaggerated. Specifically, the spherical surface shape or aspherical surface shape presented in the lens diagrams is merely an example and is not limited thereto.

[0065] The first lens refers to the lens closest to the object side, and the seventh lens refers to the lens closest to the imaging surface (or image sensor).

[0066] The first surface of each lens refers to the surface close to the object side (or object side surface), and the second surface of each lens refers to the surface close to the image side (or image side surface). In one or more examples, all numerical values such as the radius of curvature, thickness, distance, focal length, etc. of the lenses are expressed in millimeters (mm), while the field of view (FOV) is expressed in degrees.

[0067] In the description of the shape of each lens, disclosure that a surface of the lens bulges means that the paraxial region portion of the corresponding surface bulges, disclosure that a surface of the lens is recessed means that the paraxial region portion of the corresponding surface is recessed, and disclosure that a surface of the lens is planar means that the paraxial region portion of the corresponding surface is planar. Thus, although a surface of the lens may be described as bulging, the edge portion of the lens may be recessed. Similarly, although a surface of the lens may be described as recessed, the edge portion of the lens may bulge. Additionally, although a surface of the lens may be described as planar, the edge portion of the lens may bulge or be recessed.

[0068] The paraxial region refers to a significantly narrow region adjacent to the optical axis.

[0069] The imaging surface may refer to a virtual plane on which a focal point is formed by an optical imaging system. Alternatively, the imaging surface may refer to the surface of an image sensor on which light is received.

[0070] The optical imaging system in the exemplary embodiment may include seven lenses.

[0071] In an example, the optical imaging system in the exemplary 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, which are arranged in sequence from the object side to the image side. The first lens to the seventh lens may be spaced apart from each other by a predetermined distance along the optical axis.

[0072] However, the optical imaging system in the exemplary embodiment is not limited to including only seven lenses, and may further include other components as needed.

[0073] In an example, the optical imaging system may further include an image sensor that converts an image of an object incident thereon into an electrical signal.

[0074] In addition, the optical imaging system may further include an infrared filter (hereinafter referred to as "filter") that blocks infrared light. The filter may be disposed between the seventh lens and the image sensor.

[0075] In addition, the optical imaging system may further include a diaphragm that adjusts the amount of light.

[0076] The first lens to the seventh lens included in the exemplary optical imaging system may be formed of a plastic material.

[0077] At least one of the first lens to the seventh lens may have an aspherical surface. Each of the first lens to the seventh lens may have at least one aspherical surface.

[0078] That is, at least one of the first surface and the second surface of each of the first lens to the seventh lens may be an aspherical surface. The aspherical surface of each of the first lens to the seventh lens is as shown in Equation 1 below:

[0079] Equation 1:

[0080]

[0081] In Equation 1, c is the curvature of the lens (the reciprocal of the radius of curvature), K is the conic constant, and Y is the distance from a point on the aspherical surface of the lens to the optical axis. In addition, the constants A-H, J, and L-P are aspherical coefficients, and Z (SAG) is the distance in the optical axis direction from a point on the aspherical surface of the lens to the vertex of the aspherical surface.

[0082] The optical imaging system in the exemplary embodiment may satisfy at least one of the following conditional expressions:

[0083] Conditional Expression 1: 0 < f1 / f < 1.4

[0084] Conditional Expression 2: 25 < v1 - v2 < 45

[0085] Conditional Expression 3: 25 < v1 - v4 < 45

[0086] Conditional Expression 4: 15 < v1 - v6 < 25

[0087] Conditional Expression 5: -7 < f2 / f < -1

[0088] Conditional Expression 6: 1 < f3 / f < 6

[0089] Conditional Expression 7: -50 < f4 / f < 0

[0090] Conditional Expression 8: 0 < |f5 / f| / 100 < 3

[0091] Condition expression 9: 0 < f6 / f < 5

[0092] Condition expression 10: -3 < f7 / f < 0

[0093] Condition expression 11: TTL / f < 1.3

[0094] Condition expression 12: f1 / f2 < 0

[0095] Condition expression 13: f1 / f3 > 0

[0096] Condition expression 14: BFL / f < 0.3

[0097] Condition expression 15: D1 / f < 0.1

[0098] Condition expression 16: TTL / (2 × IMG HT) < 0.6

[0099] Condition expression 17: FOV × (IMG HT / f) > 70°

[0100] Condition expression 18: n2 + n4 + n5 > 4.8

[0101] Condition expression 19: -0.1 < SAG42 / TTL < 0

[0102] Condition expression 20: -0.2 < SAG52 / TTL < 0

[0103] Condition expression 21: -0.2 < SAG62 / TTL < 0

[0104] Condition expression 22: -0.3 < SAG72 / TTL < 0

[0105] In the condition expressions, 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, and f7 is the focal length of the seventh lens.

[0106] In the condition expressions, 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.

[0107] In the condition expressions, 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.

[0108] In the conditional expression, 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 equal to half of the diagonal length of the imaging surface, and FOV is the field of view of the optical imaging system.

[0109] In the conditional expression, 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.

[0110] In the conditional expression, SAG42 is the SAG value at the end of the effective aperture of the image side surface of the fourth lens, SAG52 is the SAG value at the end of the effective aperture of the image side surface of the fifth lens, SAG62 is the SAG value at the end of the effective aperture of the image side surface of the sixth lens, and SAG72 is the SAG value at the end of the effective aperture of the image side surface of the seventh lens.

[0111] When the SAG value is negative, it means that the end of the effective aperture of the corresponding lens surface is set closer to the object side than the vertex of the corresponding lens surface.

[0112] When the SAG value is positive, it means that the end of the effective aperture of the corresponding lens surface is set closer to the image side than the vertex of the corresponding lens surface.

[0113] The first lens to the seventh lens included in the optical imaging system in the exemplary embodiment will be described.

[0114] The first lens may have a positive refractive power. Additionally, the first lens may have a meniscus shape with its object side surface bulging. Additionally, the first surface of the first lens may be convex, and the second surface of the first lens may be concave.

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

[0116] The second lens may have a negative refractive power. Additionally, the second lens may have a meniscus shape with its object side surface bulging. Additionally, the first surface of the second lens may be convex, and the second surface of the second lens may be concave.

[0117] At least one of the first surface and the second surface of the second lens may be aspherical. In an example, both surfaces of the second lens may be aspherical.

[0118] The third lens may have a positive refractive power. Additionally, the third lens may have a shape that bulges on both sides. Additionally, the first surface and the second surface of the third lens may be convex.

[0119] Alternatively, the third lens may have a meniscus shape with its object side convex. Additionally, the first surface of the third lens may be convex, and the second surface of the third lens may be concave.

[0120] At least one of the first surface and the second surface of the third lens may be aspherical. In an example, both surfaces of the third lens may be aspherical.

[0121] The fourth lens may have a negative refractive power. Additionally, both surfaces of the fourth lens may be concave. Additionally, the first surface and the second surface of the fourth lens may be concave.

[0122] Alternatively, the fourth lens may have a meniscus shape with its image side convex. Additionally, the first surface of the fourth lens may be concave, and the second surface of the fourth lens may be convex.

[0123] At least one of the first surface and the second surface of the fourth lens may be aspherical. In an example, both surfaces of the fourth lens may be aspherical.

[0124] The fifth lens may have a positive or negative refractive power. Additionally, the fifth lens may have a meniscus shape with its object side convex. Additionally, the first surface of the fifth lens may be convex in the paraxial region, and the second surface of the fifth lens may be concave in the paraxial region.

[0125] At least one of the first surface and the second surface of the fifth lens may be aspherical. In an example, both surfaces of the fifth lens may be aspherical.

[0126] At least one inflection point may be formed on at least one of the first surface and the second surface of the fifth lens. In an example, the first surface of the fifth lens may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the fifth lens may be concave in the paraxial region and convex in a portion or region other than the paraxial region.

[0127] The sixth lens may have a positive refractive power. Additionally, the sixth lens may have a shape with both surfaces convex. Additionally, the first surface of the sixth lens may be convex in the paraxial region, and the second surface of the sixth lens may be convex in the paraxial region.

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

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

[0130] The seventh lens may have a negative refractive power. Additionally, the seventh lens may have a meniscus shape with its object side convex. Additionally, 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.

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

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

[0133] Each of the first lens to the seventh lens may be formed of a plastic material having optical properties different from those of adjacent lenses.

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

[0135] Among the first lens to the fourth lens, the lens having a negative refractive index may have a refractive index greater than 1.67. In an example, the second lens and the fourth lens may have negative refractive powers and may have a refractive index greater than 1.67.

[0136] The sum of the Abbe number of the second lens and the Abbe number of the fourth lens may be less than the Abbe number of the third lens.

[0137] Reference will be made Figure 1 and Figure 2 to describe an exemplary optical imaging system according to the first exemplary embodiment.

[0138] The exemplary optical imaging system 100 in the first exemplary embodiment may include an optical system including 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, and may further include a filter 180 and an image sensor IS.

[0139] In the exemplary optical imaging system of the first exemplary embodiment, an image can be focused on an imaging surface 190. The imaging surface 190 can refer to a surface on which a focus or an image is formed by the optical imaging system. In an example, the imaging surface 190 can refer to a surface of the image sensor IS on which light is received.

[0140] The lens characteristics (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number, and focal length) of each lens are listed in Table 1 below.

[0141] Table 1

[0142]

[0143]

[0144] In the exemplary optical imaging system of the first exemplary embodiment, the total focal length f can be 4.7 mm, IMGHT can be 5.107 mm, FOV can be 92.2°, SAG42 can be -0.285 mm, SAG52 can be -0.4607 mm, SAG62 can be -0.9198 mm, and SAG72 can be -1.5098 mm.

[0145] In the first exemplary embodiment, the first lens 110 can have a positive refractive power, the first surface of the first lens 110 can be convex, and the second surface of the first lens 110 can be concave.

[0146] The second lens 120 can have a negative refractive power, the first surface of the second lens 120 can be convex, and the second surface of the second lens 120 can be concave.

[0147] The third lens 130 can have a positive refractive power, the first surface of the third lens 130 can be convex, and the second surface of the third lens 130 can be convex.

[0148] The fourth lens 140 can have a negative refractive power, the first surface of the fourth lens 140 can be concave, and the second surface of the fourth lens 140 can be concave.

[0149] The fifth lens 150 can have a negative refractive power, the first surface of the fifth lens 150 can be convex in the paraxial region, and the second surface of the fifth lens 150 can be concave in the paraxial region.

[0150] At least one inflection point may be formed on at least one of the first surface and the second surface of the fifth lens 150. In an example, the first surface of the fifth lens 150 may be convex in the paraxial region and concave in a part or region other than the paraxial region. The second surface of the fifth lens 150 may be concave in the paraxial region and convex in a part or region other than the paraxial region.

[0151] The sixth lens 160 may have a positive 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 convex in the paraxial region.

[0152] At least one inflection point may be formed on at least one of the first surface and the second surface of the sixth lens 160. In an example, the first surface of the sixth lens 160 may be convex in the paraxial region and concave in a part or region other than the paraxial region. The second surface of the sixth lens 160 may be convex in the paraxial region and concave in a part or region other than the paraxial region.

[0153] The seventh lens 170 may have a negative 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.

[0154] At least one inflection point may be formed on at least one of the first surface and the second surface of the seventh lens 170. In an example, the first surface of the seventh lens 170 may be convex in the paraxial region and concave in a part or region other than the paraxial region. The second surface of the seventh lens 170 may be concave in the paraxial region and convex in a part or region other than the paraxial region.

[0155] Table 2

[0156]

[0157]

[0158] The optical imaging system with the above configuration may have Figure 2 the aberration characteristics shown.

[0159] Reference will be made to Figure 3 and Figure 4 to describe an exemplary optical imaging system according to a second exemplary embodiment.

[0160] The exemplary optical imaging system 200 in the second exemplary embodiment may include an optical system, which 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, and may further include a filter 280 and an image sensor IS.

[0161] The exemplary optical imaging system 200 in the second exemplary embodiment may focus an image on an imaging surface 290. The imaging surface 290 may refer to a surface on which the optical imaging system forms a focal point. In an example, the imaging surface 290 may refer to a surface of the image sensor IS on which light is received.

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

[0163] Table 3

[0164] Surface Number Remarks Radius of Curvature Thickness or Distance Refractive Index Abbe Number Focal Length S1 First Lens 2.0035 0.6245 1.544 56.0 4.73 S2 7.9396 0.1000 S3 Second Lens 12.3844 0.2200 1.671 19.2 -12.57 S4 5.0156 0.1897 S5 Third Lens 15.9371 0.3317 1.535 55.7 13.36 S6 -12.9628 0.3198 S7 Fourth Lens -16.5044 0.2200 1.671 19.2 -21.5 S8 127.0180 0.3096 S9 Fifth Lens 5.8944 0.2200 1.635 24.0 -18.5 S10 3.8803 0.3280 S11 Sixth Lens 6.2741 0.4233 1.567 37.4 4.09 S12 -3.6294 0.8348 S13 Seventh Lens 46.3653 0.4000 1.544 56.0 -3.45 S14 1.8050 0.1685 S15 Filter Infinity 0.1100 1.517 64.2 S16 Infinity 0.7000 S17 Imaging Plane Infinity

[0165] In the exemplary optical imaging system in the second exemplary embodiment, the total focal length f may be 4.69 mm, IMGHT may be 5.107 mm, FOV may be 92.3°, SAG42 may be -0.2884 mm, SAG52 may be -0.4644 mm, SAG62 may be -0.9078 mm, and SAG72 may be -1.374 mm.

[0166] In the second exemplary embodiment, the first lens 210 may have a 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.

[0167] The second lens 220 may have a 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.

[0168] The third lens 230 may have a positive refractive power, and the first surface of the third lens 230 may be convex, and the second surface of the third lens 230 may be convex.

[0169] The fourth lens 240 may have a negative refractive power, and the first surface of the fourth lens 240 may be concave, and the second surface of the fourth lens 240 may be concave.

[0170] The fifth lens 250 may have a 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.

[0171] At least one inflection point may be formed on at least one of the first surface and the second surface of the fifth lens 250. In an example, the first surface of the fifth lens 250 may be convex in the paraxial region and concave in a part or region other than the paraxial region. The second surface of the fifth lens 250 may be concave in the paraxial region and convex in a part or region other than the paraxial region.

[0172] The sixth lens 260 may have a positive 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 convex in the paraxial region.

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

[0174] The seventh lens 270 may have a negative 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.

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

[0176] Each surface of the first lens 210 to the seventh lens 270 may have an aspherical coefficient as shown in Table 4 below. In an example, both the object side and the image side of the first lens 210 to the seventh lens 270 may be aspherical.

[0177] Table 4

[0178]

[0179]

[0180] The optical imaging system with the above configuration may have Figure 4 the aberration characteristics shown.

[0181] Reference will be made to Figure 5 and Figure 6Describe an exemplary optical imaging system according to a third exemplary embodiment.

[0182] The exemplary optical imaging system 300 in the third exemplary embodiment may include an optical system, which 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, and may further include a filter 380 and an image sensor IS.

[0183] The exemplary optical imaging system in the third exemplary embodiment may form a focal point on an imaging surface 390. The imaging surface 390 may refer to a surface on which the optical imaging system forms a focal point. In an example, the imaging surface 390 may refer to a surface of the image sensor IS on which light is received.

[0184] The lens characteristics (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number, and focal length) of each lens are listed in Table 5 below.

[0185] Table 5

[0186]

[0187]

[0188] In the exemplary optical imaging system according to the third exemplary embodiment, the total focal length f may be 4.69 mm, IMG HT may be 5.107 mm, FOV may be 92.6°, SAG42 may be -0.2908 mm, SAG52 may be -0.4991 mm, SAG62 may be -0.9065 mm, and SAG72 may be -1.1628 mm.

[0189] In the third exemplary embodiment, the first lens 310 may have a 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.

[0190] The second lens 320 may have a 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.

[0191] The third lens 330 may have a positive refractive power, and the first surface of the third lens 330 may be convex, and the second surface of the third lens 330 may be convex.

[0192] The fourth lens 340 may have a negative 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.

[0193] The fifth lens 350 may have a 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.

[0194] At least one inflection point may be formed on at least one of the first surface and the second surface of the fifth lens 350. In an example, the first surface of the fifth lens 350 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the fifth lens 350 may be concave in the paraxial region and convex in a portion or region other than the paraxial region.

[0195] The sixth lens 360 may have a positive 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 convex in the paraxial region.

[0196] 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. In an example, the first surface of the sixth lens 360 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the sixth lens 360 may be convex in the paraxial region and concave in a portion or region other than the paraxial region.

[0197] The seventh lens 370 may have a negative 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.

[0198] At least one inflection point may be formed on at least one of the first surface and the second surface of the seventh lens 370. In an example, the first surface of the seventh lens 370 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the seventh lens 370 may be concave in the paraxial region and convex in a portion or region other than the paraxial region.

[0199] Each surface of the first lens 310 to the seventh lens 370 may have an aspherical coefficient as shown in Table 6 below. In an example, both the object side and the image side of the first lens 310 to the seventh lens 370 may be aspherical.

[0200] Table 6

[0201]

[0202]

[0203] The optical imaging system with the above configuration may have Figure 6 the aberration characteristics shown.

[0204] Reference will be made to Figure 7 and Figure 8 describe an exemplary optical imaging system according to a fourth exemplary embodiment.

[0205] The exemplary optical imaging system 400 in the fourth exemplary embodiment may include an optical system, which 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, and may further include a filter 480 and an image sensor IS.

[0206] The exemplary optical imaging system in the fourth exemplary embodiment may form a focal point on an imaging surface 490. The imaging surface 490 may refer to a surface on which the optical imaging system forms a focal point. In an example, the imaging surface 490 may refer to a surface of the image sensor IS on which light is received.

[0207] The lens characteristics (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number, and focal length) of each lens are listed in Table 7 below.

[0208] Table 7

[0209] Surface Number Remarks Radius of Curvature Thickness or Distance Refractive Index Abbe Number Focal Length S1 First Lens 1.9052 0.6837 1.544 56.0 5.18 S2 5.0936 0.1058 S3 Second Lens 8.2142 0.2200 1.671 19.2 -21.12 S4 5.1655 0.1656 S5 Third Lens 11.4065 0.3139 1.535 55.7 17.47 S6 -52.3968 0.2822 S7 Fourth Lens -17.7660 0.2200 1.671 19.2 -22.72 S8 117.6799 0.2929 S9 Fifth Lens 5.2056 0.2200 1.614 25.9 -28.2 S10 3.9464 0.3166 S11 Sixth Lens 6.2102 0.4078 1.567 37.4 4.46 S12 -4.2063 0.7081 S13 Seventh Lens 15.7321 0.5534 1.535 55.7 -3.5 S14 1.6607 0.2000 S15 Filter Infinity 0.1100 1.517 64.2 S16 Infinity 0.7000 S17 Imaging Plane Infinity

[0210] In the exemplary optical imaging system in the fourth exemplary embodiment, the total focal length f may be 4.67 mm, IMGHT may be 5.107 mm, FOV may be 92.6°, SAG42 may be -0.2803 mm, SAG52 may be -0.5284 mm, SAG62 may be -0.8368 mm, and SAG72 may be -0.9436 mm.

[0211] In the fourth exemplary embodiment, the first lens 410 may have a 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.

[0212] The second lens 420 may have a 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.

[0213] The third lens 430 may have a positive refractive power, and the first surface of the third lens 430 may be convex, and the second surface of the third lens 430 may be convex.

[0214] The fourth lens 440 may have a negative refractive power, and the first surface of the fourth lens 440 may be concave, and the second surface of the fourth lens 440 may be concave.

[0215] The fifth lens 450 may have a 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.

[0216] At least one inflection point may be formed on at least one of the first surface and the second surface of the fifth lens 450. In an example, the first surface of the fifth lens 450 may be convex in the paraxial region and concave in a part or region other than the paraxial region. The second surface of the fifth lens 450 may be concave in the paraxial region and convex in a part or region other than the paraxial region.

[0217] The sixth lens 460 may have a positive 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 convex in the paraxial region.

[0218] At least one inflection point may be formed on at least one of the first surface and the second surface of the sixth lens 460. In an example, the first surface of the sixth lens 460 may be convex in the paraxial region and concave in a part or region other than the paraxial region. The second surface of the sixth lens 460 may be convex in the paraxial region and concave in a part or region other than the paraxial region.

[0219] The seventh lens 470 may have a negative 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.

[0220] At least one inflection point may be formed on at least one of the first surface and the second surface of the seventh lens 470. In an example, the first surface of the seventh lens 470 may be convex in the paraxial region and concave in a part or region other than the paraxial region. The second surface of the seventh lens 470 may be concave in the paraxial region and convex in a part or region other than the paraxial region.

[0221] Each surface of the first lens 410 to the seventh lens 470 may have an aspherical coefficient as shown in Table 8 below. In an example, both the object side and the image side of the first lens 410 to the seventh lens 470 may be aspherical.

[0222] Table 8

[0223]

[0224]

[0225] The optical imaging system configured as described above may have Figure 8 the aberration characteristics shown.

[0226] Reference will be made to Figure 9 and Figure 10 to describe an exemplary optical imaging system according to a fifth exemplary embodiment.

[0227] The optical imaging system 500 in the fifth exemplary embodiment may include an optical system that 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, and may further include a filter 580 and an image sensor IS.

[0228] The exemplary optical imaging system in the fifth exemplary embodiment may form a focal point on an imaging surface 590. The imaging surface 590 may refer to the surface on which the optical imaging system forms a focal point. In an example, the imaging surface 590 may refer to one surface of the image sensor IS on which light is received.

[0229] The lens characteristics (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number, and focal length) of each lens are listed in Table 9 below.

[0230] Table 9

[0231]

[0232]

[0233] In the exemplary optical imaging system in the fifth exemplary embodiment, the total focal length f may be 4.59 mm, IMGHT may be 5.107 mm, FOV may be 93.2°, SAG42 may be -0.3066 mm, SAG52 may be -0.5446 mm, SAG62 may be -0.7909 mm, and SAG72 may be -0.8603 mm.

[0234] In the fifth exemplary embodiment, the first lens 510 may have a 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.

[0235] The second lens 520 may have a 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.

[0236] The third lens 530 may have a positive refractive power, and the first surface of the third lens 530 may be convex, and the second surface of the third lens 530 may be convex.

[0237] The fourth lens 540 may have a negative refractive power, and the first surface of the fourth lens 540 may be concave, and the second surface of the fourth lens 540 may be concave.

[0238] The fifth lens 550 may have a positive 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.

[0239] At least one inflection point may be formed on at least one of the first surface and the second surface of the fifth lens 550. In an example, the first surface of the fifth lens 550 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the fifth lens 550 may be concave in the paraxial region and convex in a portion or region other than the paraxial region.

[0240] The sixth lens 560 may have a 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 convex in the paraxial region.

[0241] At least one inflection point may be formed on at least one of the first surface and the second surface of the sixth lens 560. In an example, the first surface of the sixth lens 560 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the sixth lens 560 may be convex in the paraxial region and concave in a portion or region other than the paraxial region.

[0242] The seventh lens 570 may have a negative refractive power, the first surface of the seventh lens 570 may be convex in the paraxial region, and the second surface of the seventh lens 570 may be concave in the paraxial region.

[0243] At least one inflection point may be formed on at least one of the first surface and the second surface of the seventh lens 570. In an example, the first surface of the seventh lens 570 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the seventh lens 570 may be concave in the paraxial region and convex in a portion or region other than the paraxial region.

[0244] Each surface of the first lens 510 to the seventh lens 570 may have an aspherical coefficient as shown in Table 10 below. In an example, both the object side and the image side of the first lens 510 to the seventh lens 570 may be aspherical.

[0245] Table 10

[0246]

[0247]

[0248] The optical imaging system configured as described above may have Figure 10 the aberration characteristics shown.

[0249] Reference will be made to Figure 11 and Figure 12 to describe an exemplary optical imaging system according to a sixth exemplary embodiment.

[0250] The exemplary optical imaging system 600 in the sixth exemplary embodiment may include an optical system that 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, and may also include a filter 680 and an image sensor IS.

[0251] The exemplary optical imaging system in the sixth exemplary embodiment may form a focal point on an imaging surface 690. The imaging surface 690 may refer to a surface on which the optical imaging system forms a focal point. In an example, the imaging surface 690 may refer to a surface of the image sensor IS on which light is received.

[0252] The lens characteristics (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number, and focal length) of each lens are listed in Table 11 below.

[0253] Table 11

[0254]

[0255]

[0256] In the exemplary optical imaging system in the sixth exemplary embodiment, the total focal length f may be 4.63 mm, IMGHT may be 5.107 mm, FOV may be 92.7°, SAG42 may be -0.3279 mm, SAG52 may be -0.5371 mm, SAG62 may be -0.7471 mm, and SAG72 may be -1.0442 mm.

[0257] In the sixth exemplary embodiment, the first lens 610 may have a 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.

[0258] The second lens 620 may have a 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.

[0259] The third lens 630 may have a 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 convex.

[0260] The fourth lens 640 may have a negative 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.

[0261] The fifth lens 650 may have a 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.

[0262] At least one inflection point may be formed on at least one of the first surface and the second surface of the fifth lens 650. In an example, the first surface of the fifth lens 650 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the fifth lens 650 may be concave in the paraxial region and convex in a portion or region other than the paraxial region.

[0263] The sixth lens 660 may have a positive 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 convex in the paraxial region.

[0264] At least one inflection point may be formed on at least one of the first surface and the second surface of the sixth lens 660. In an example, the first surface of the sixth lens 660 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the sixth lens 660 may be convex in the paraxial region and concave in a portion or region other than the paraxial region.

[0265] The seventh lens 670 may have a negative 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.

[0266] At least one inflection point may be formed on at least one of the first surface and the second surface of the seventh lens 670. In an example, the first surface of the seventh lens 670 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the seventh lens 670 may be concave in the paraxial region and convex in a portion or region other than the paraxial region.

[0267] Each surface of the first lens 610 to the seventh lens 670 may have an aspherical coefficient as shown in Table 12 below. In the example, both the object side and the image side of the first lens 610 to the seventh lens 670 may be aspherical.

[0268] Table 12

[0269]

[0270]

[0271] The optical imaging system with the above configuration may have Figure 12 the aberration characteristics shown.

[0272] Reference will be made to Figure 13 and Figure 14 to describe an exemplary optical imaging system according to the seventh exemplary embodiment.

[0273] The exemplary optical imaging system 700 in the seventh exemplary embodiment may include an optical system that 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, and may also include a filter 780 and an image sensor IS.

[0274] The exemplary optical imaging system in the seventh exemplary embodiment may form a focal point on the imaging surface 790. The imaging surface 790 may refer to the surface on which the optical imaging system forms a focal point. In the example, the imaging surface 790 may refer to one surface of the image sensor IS on which light is received.

[0275] The lens characteristics (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number, and focal length) of each lens are listed in Table 13 below.

[0276] Table 13

[0277]

[0278]

[0279] In the exemplary optical imaging system in the seventh exemplary embodiment, the total focal length f may be 4.59 mm, IMGHT may be 5.107 mm, FOV may be 92.6°, SAG42 may be -0.3144 mm, SAG52 may be -0.5257 mm, SAG62 may be -0.7818 mm, and SAG72 may be -0.8678 mm.

[0280] In a seventh exemplary embodiment, the first lens 710 may have a 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.

[0281] The second lens 720 may have a 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.

[0282] The third lens 730 may have a 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 convex.

[0283] The fourth lens 740 may have a negative refractive power, the first surface of the fourth lens 740 may have a concave shape, and the second surface of the fourth lens 740 may have a concave shape.

[0284] The fifth lens 750 may have a positive 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.

[0285] At least one inflection point may be formed on at least one of the first surface and the second surface of the fifth lens 750. In an example, the first surface of the fifth lens 750 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the fifth lens 750 may be concave in the paraxial region and convex in a portion or region other than the paraxial region.

[0286] The sixth lens 760 may have a positive 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 convex in the paraxial region.

[0287] At least one inflection point may be formed on at least one of the first surface and the second surface of the sixth lens 760. In an example, the first surface of the sixth lens 760 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the sixth lens 760 may be convex in the paraxial region and concave in a portion or region other than the paraxial region.

[0288] The seventh lens 770 may have a negative 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.

[0289] At least one inflection point may be formed on at least one of the first surface and the second surface of the seventh lens 770. In an example, the first surface of the seventh lens 770 may be convex in the paraxial region and concave in a part or region other than the paraxial region. The second surface of the seventh lens 770 may be concave in the paraxial region and convex in a part or region other than the paraxial region.

[0290] Each surface of the first lens 710 to the seventh lens 770 may have an aspherical coefficient as shown in Table 14 below. In an example, both the object side surface and the image side surface of the first lens 710 to the seventh lens 770 may be aspherical.

[0291] Table 14

[0292]

[0293]

[0294] The optical imaging system configured as described above may have Figure 14 the aberration characteristics shown.

[0295] Reference will be made to Figure 15 and Figure 16 to describe an exemplary optical imaging system according to an eighth exemplary embodiment.

[0296] The exemplary optical imaging system in the eighth exemplary embodiment may include an optical system including 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, and may further include a filter 880 and an image sensor IS.

[0297] The exemplary optical imaging system in the eighth exemplary embodiment may form a focal point on an imaging surface 890. The imaging surface 890 may refer to a surface on which the optical imaging system forms a focal point. In an example, the imaging surface 890 may refer to a surface of the image sensor IS on which light is received.

[0298] The lens characteristics (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number, and focal length) of each lens are listed in Table 15 below.

[0299] Table 15

[0300]

[0301]

[0302] In the exemplary optical imaging system according to the eighth exemplary embodiment, the total focal length f may be 4.61 mm, the IMG HT may be 5.107 mm, the FOV may be 93.1°, the SAG42 may be -0.3381 mm, the SAG52 may be -0.516 mm, the SAG62 may be -0.7674 mm, and the SAG72 may be -0.9586 mm.

[0303] In the eighth exemplary embodiment, the first lens 810 may have a 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.

[0304] The second lens 820 may have a 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.

[0305] The third lens 830 may have a 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 convex.

[0306] The fourth lens 840 may have a negative refractive power, the first surface of the fourth lens 840 may be concave, and the second surface of the fourth lens 840 may be convex.

[0307] The fifth lens 850 may have a 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.

[0308] At least one inflection point may be formed on at least one of the first surface and the second surface of the fifth lens 850. In an example, the first surface of the fifth lens 850 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the fifth lens 850 may be concave in the paraxial region and convex in a portion or region other than the paraxial region.

[0309] The sixth lens 860 may have a 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 convex in the paraxial region.

[0310] At least one inflection point may be formed on at least one of the first surface and the second surface of the sixth lens 860. In an example, the first surface of the sixth lens 860 may be convex in the paraxial region and concave in a portion or region other than the paraxial region. The second surface of the sixth lens 860 may be convex in the paraxial region and concave in a portion or region other than the paraxial region.

[0311] The seventh lens 870 may have a negative refractive power. The first surface of the seventh lens 870 may be convex in the paraxial region, and the second surface of the seventh lens 870 may be concave in the paraxial region.

[0312] At least one inflection point may be formed on at least one of the first surface and the second surface of the seventh lens 870. In an example, the first surface of the seventh lens 870 may be convex in the paraxial region and concave in a part or region other than the paraxial region. The second surface of the seventh lens 870 may be concave in the paraxial region and convex in a part or region other than the paraxial region.

[0313] Each surface of the first lens 810 to the seventh lens 870 may have an aspherical coefficient as shown in Table 16 below. In an example, both the object side and the image side of the first lens 810 to the seventh lens 870 may be aspherical.

[0314] Table 16

[0315]

[0316]

[0317] The exemplary optical imaging system of the above configuration may have Figure 16 the aberration characteristics shown.

[0318] Reference will be made to Figure 17 and Figure 18 to describe an exemplary optical imaging system according to a ninth exemplary embodiment.

[0319] The exemplary optical imaging system 900 in the ninth exemplary embodiment may include an optical system that 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, and may further include a filter 980 and an image sensor IS.

[0320] The exemplary optical imaging system in the ninth exemplary embodiment may form a focal point on an imaging surface 990. The imaging surface 990 may refer to a surface on which the optical imaging system forms a focal point. In an example, the imaging surface 990 may refer to a surface of the image sensor IS on which light is received.

[0321] The lens characteristics (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number, and focal length) of each lens are listed in Table 17 below.

[0322] Table 17

[0323] Surface Number Remarks Radius of Curvature Thickness or Distance Refractive Index Abbe Number Focal Length S1 First Lens 2.0948 0.7386 1.544 56.0 5.47 S2 6.1218 0.1379 S3 Second Lens 9.0500 0.2200 1.680 18.2 -17.77 S4 5.1527 0.1779 S5 Third Lens 10.9487 0.4055 1.535 55.7 14.64 S6 -27.5703 0.3287 S7 Fourth Lens -10.8002 0.2249 1.680 18.2 -20.79 S8 -44.2184 0.2952 S9 Fifth Lens 5.6070 0.2251 1.635 24.0 -67.23 S10 4.8838 0.4209 S11 Sixth Lens 6.5894 0.4859 1.567 37.4 5.62 S12 -6.0810 0.9447 S13 Seventh Lens 20.3643 0.4979 1.535 55.7 -3.82 S14 1.8491 0.2000 S15 Filter Infinity 0.1100 1.517 64.2 S16 Infinity 0.5368 S17 Imaging Plane Infinity

[0324] In the exemplary optical imaging system according to the ninth embodiment, the total focal length f can be 4.96 mm, the IMG HT can be 5.107 mm, the FOV can be 88.9°, the SAG42 can be -0.3534 mm, and the SAG52 can be -0.4707 mm, the SAG62 can be -0.8829 mm, and the SAG72 can be -0.5357 mm.

[0325] In the ninth exemplary embodiment, the first lens 910 can have a positive refractive power, the first surface of the first lens 910 can be convex, and the second surface of the first lens 910 can be concave.

[0326] The second lens 920 can have a negative refractive power, the first surface of the second lens 920 can be convex, and the second surface of the second lens 920 can be concave.

[0327] The third lens 930 can have a positive refractive power, and the first surface of the third lens 930 can be convex, and the second surface of the third lens 930 can be convex.

[0328] The fourth lens 940 can have a negative refractive power, the first surface of the fourth lens 940 can be concave, and the second surface of the fourth lens 940 can be convex.

[0329] The fifth lens 950 can have a negative refractive power, the first surface of the fifth lens 950 can be convex in the paraxial region, and the second surface of the fifth lens 950 can be concave in the paraxial region.

[0330] At least one inflection point can be formed on at least one of the first surface and the second surface of the fifth lens 950. In an example, the first surface of the fifth lens 950 can be convex in the paraxial region and concave in a part or region other than the paraxial region. The second surface of the fifth lens 950 can be concave in the paraxial region and convex in a part or region other than the paraxial region.

[0331] The sixth lens 960 can have a positive refractive power, and the first surface of the sixth lens 960 can be convex in the paraxial region, and the second surface of the sixth lens 960 can be convex in the paraxial region.

[0332] At least one inflection point can be formed on at least one of the first surface and the second surface of the sixth lens 960. In an example, the first surface of the sixth lens 960 can be convex in the paraxial region and concave in a part or region other than the paraxial region. The second surface of the sixth lens 960 can be convex in the paraxial region and concave in a part or region other than the paraxial region.

[0333] The seventh lens 970 may have a negative refractive power. The first surface of the seventh lens 970 may be convex in the paraxial region, and the second surface of the seventh lens 970 may be concave in the paraxial region.

[0334] At least one inflection point may be formed on at least one of the first surface and the second surface of the seventh lens 970. In an example, the first surface of the seventh lens 970 may be convex in the paraxial region and concave in a part or region other than the paraxial region. The second surface of the seventh lens 970 may be concave in the paraxial region and convex in a part or region other than the paraxial region.

[0335] Each surface of the first lens 910 to the seventh lens 970 may have an aspherical coefficient as shown in Table 18 below. In an example, both the object side and the image side of the first lens 910 to the seventh lens 970 may be aspherical.

[0336] Table 18

[0337]

[0338]

[0339] The exemplary optical imaging system configured as described above may have Figure 18 the aberration characteristics shown.

[0340] Reference will be made to Figure 19 and Figure 20 to describe the exemplary optical imaging system 1000 according to the tenth exemplary embodiment.

[0341] The exemplary optical imaging system 1000 in the tenth exemplary embodiment may include an optical system including 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, and may further include a filter 1080 and an image sensor IS.

[0342] The exemplary optical imaging system in the tenth exemplary embodiment may form a focal point on the imaging surface 1090. The imaging surface 1090 may refer to the surface on which the optical imaging system forms a focal point. In an example, the imaging surface 1090 may refer to the surface of the image sensor IS on which light is received.

[0343] The lens characteristics (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number, and focal length) of each lens are listed in Table 19 below.

[0344] Table 19

[0345]

[0346]

[0347] In the exemplary optical imaging system of the tenth exemplary embodiment, the total focal length f may be 5.27 mm, IMGHT may be 5.107 mm, FOV may be 85°, SAG42 may be -0.3707 mm, SAG52 may be -0.5412 mm, SAG62 may be -0.8408 mm, and SAG72 may be -1.3676 mm.

[0348] In the tenth exemplary embodiment, the first lens 1010 may have a 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.

[0349] The second lens 1020 may have a 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.

[0350] The third lens 1030 may have a 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.

[0351] The fourth lens 1040 may have a negative refractive power, the first surface of the fourth lens 1040 may be concave, and the second surface of the fourth lens 1040 may be convex.

[0352] The fifth lens 1050 may have a 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.

[0353] At least one inflection point may be formed on at least one of the first surface and the second surface of the fifth lens 1050. In an example, the first surface of the fifth lens 1050 may be convex in the paraxial region and concave in a part or region other than the paraxial region. The second surface of the fifth lens 1050 may be concave in the paraxial region and convex in a part or region other than the paraxial region.

[0354] The sixth lens 1060 may have a positive refractive power, and the first surface of the sixth lens 1060 may be convex in the paraxial region, and the second surface of the sixth lens 1060 may be convex in the paraxial region.

[0355] At least one inflection point may be formed on at least one of the first surface and the second surface of the sixth lens 1060. In an example, the first surface of the sixth lens 1060 may be convex in the paraxial region and concave in a part or region other than the paraxial region. The second surface of the sixth lens 1060 may be convex in the paraxial region and concave in a part or region other than the paraxial region.

[0356] The seventh lens 1070 may have a 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.

[0357] At least one inflection point may be formed on at least one of the first surface and the second surface of the seventh lens 1070. In an example, the first surface of the seventh lens 1070 may be convex in the paraxial region and concave in a part or region other than the paraxial region. The second surface of the seventh lens 1070 may be concave in the paraxial region and convex in a part or region other than the paraxial region.

[0358] Each surface of the first lens 1010 to the seventh lens 1070 may have an aspherical coefficient as shown in Table 20 below. In an example, both the object side and the image side of the first lens 1010 to the seventh lens 1070 may be aspherical.

[0359] Table 20

[0360]

[0361]

[0362] The exemplary optical imaging system with the above configuration may have Figure 20 the aberration characteristics shown.

[0363] As described above, the optical imaging system according to the exemplary embodiments of the present disclosure may have a reduced size while achieving high resolution.

[0364] While specific examples have been shown and described above, it will be apparent after understanding the present disclosure 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 considered to be illustrative only and not for the purpose of limitation. The description of a feature or aspect in each example is considered to be 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 systems, architectures, devices, or circuits are combined in a different manner, and / or replaced or supplemented by other components or their equivalents. Accordingly, the scope of the present disclosure is defined not by the specific embodiments, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents will be construed as being included in the present disclosure.

Claims

1. An optical imaging system, comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially arranged from the object side to the image side, and an image sensor configured to convert an image of an object incident thereon into an electrical signal, wherein: the first lens has a positive refractive power, a convex object side surface, and a concave image side surface, the second lens has a negative refractive power, a convex object side surface, and a concave image side surface, the third lens has a positive refractive power and a convex object side surface, the fourth lens has a negative refractive power and a concave object side surface, the fifth lens has a negative refractive power, a convex object side surface, and a concave image side surface, the sixth lens has a positive refractive power, a convex object side surface, and a convex image side surface, and the seventh lens has a negative refractive power, a convex object side surface, and a concave image side surface, wherein: 5.4999 / (2×5.107) ≤ TTL / (2×IMG HT) < 0.6 and -0.1 < SAG42 / TTL < 0 are satisfied, wherein, TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface, IMG HT is equal to half of the diagonal length of the imaging surface, SAG42 is the SAG value at the end of the effective aperture of the image side surface of the fourth lens, f is the total focal length of the optical imaging system, and wherein, the number of lenses with refractive power in the optical imaging system is seven.

2. The optical imaging system according to claim 1, wherein: at least one of -0.2 < SAG52 / TTL < 0, -0.2 < SAG62 / TTL < 0, and -0.3 < SAG72 / TTL < 0 is satisfied, wherein, SAG52 is the SAG value at the end of the effective aperture of the image side surface of the fifth lens, SAG62 is the SAG value at the end of the effective aperture of the image side surface of the sixth lens, and SAG72 is the SAG value at the end of the effective aperture of the image side surface of the seventh lens.

3. The optical imaging system according to claim 1, wherein: at least one of 25 < v1 - v2 < 45, 25 < v1 - v4 < 45, and 15 < v1 - v6 < 25 is satisfied, wherein, 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.

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

5. The optical imaging system according to claim 1, wherein: -7 < f2 / f < -1 is satisfied, wherein, f2 is the focal length of the second lens.

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

7. The optical imaging system according to claim 1, wherein: -50 < f4 / f < 0 is satisfied, wherein, f4 is the focal length of the fourth lens.

8. The optical imaging system according to claim 1, wherein: Satisfy 0 < f5 / f / 100 < 3, Wherein, f is the total focal length of the optical imaging system, and f5 is the focal length of the fifth lens.

9. The optical imaging system according to claim 1, wherein: 0 < f6 / f < 5 is satisfied, wherein, f6 is the focal length of the sixth lens.

10. The optical imaging system according to claim 1, wherein: -3 < f7 / f < 0 is satisfied, wherein, f7 is the focal length of the seventh lens.

11. The optical imaging system according to claim 1, wherein: TTL / f < 1.3 and BFL / f < 0.3 are satisfied, wherein, BFL is the distance on the optical axis from the image side of the seventh lens to the imaging surface.

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

13. The optical imaging system according to claim 1, wherein: FOV × (IMG HT / f) > 70° is satisfied, wherein, f is the total focal length of the optical imaging system, and FOV is the field of view of the optical imaging system.

14. The optical imaging system according to claim 1, wherein: n2 + n4 + n5 > 4.8 is satisfied, wherein, 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.

15. The optical imaging system according to claim 1, wherein, at least one inflection point is provided on at least one of the first surface and the second surface of each of the fifth lens, the sixth lens, and the seventh lens.

Images