Optical image capturing system

Abstract

The utility model relates to an optical imaging system. The optical image capturing system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens disposed in order from an object side, in which a conditional expression TTL / (2 * IMG HT) < = 0.57 is satisfied, where TTL is a distance from an object side surface of the first lens to an image plane along an optical axis, and IMG HT is half a diagonal length of the image plane.

Description

[0001] Cross Reference to Related Applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0064106, filed May 16, 2024, in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety for all purposes. TECHNICAL FIELD

[0003] The disclosure relates to an optical imaging system including five lenses. BACKGROUND

[0004] A high-resolution camera can be employed in a portable electronic device, and a high-resolution camera can also be employed for a rear camera and for a front camera.

[0005] As the resolution of a camera increases, the total optical length of a lens can increase, but due to slimming of a portable electronic device, there is a need to produce a camera having a high resolution and a short total optical length.

[0006] The above information is presented as background information only to assist with an understanding of the disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the disclosure. SUMMARY

[0007] The summary is presented in order to provide a simplified summary of the disclosure so as to familiarize the reader with the concepts described herein. The summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to be used to determine the scope of the claimed subject matter.

[0008] In one general aspect, an optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens disposed in order from an object side, wherein a condition expression TTL / (2xIMG_HT)≤0.57 is satisfied, where TTL is a distance from an object side surface of the first lens to an image plane along an optical axis, and IMG_HT is half of a diagonal length of the image plane.

[0009] A condition expression -0.1

[0010] A condition expression -0.6

[0011] An object side surface of the second lens can be concave.

[0012] A conditional expression 0 < v1-v4 < 45 can be satisfied, where v1 is an Abbe number of the first lens, and v4 is an Abbe number of the fourth lens.

[0013] A conditional expression 70° < FOV x (2 x IMG HT) / f can be satisfied, where FOV is a field of view of the optical imaging system, and f is a focal length of the optical imaging system.

[0014] An object side surface of the fourth lens can be convex.

[0015] An image side surface of the third lens can be convex.

[0016] A conditional expression Fno x {TTL / (2 x IMG HT)} < 1.4 can be satisfied, where Fno is an F number of the optical imaging system.

[0017] In another general aspect, an optical imaging system includes a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a refractive power, a fourth lens having a refractive power, and a fifth lens having a negative refractive power, wherein the first lens to the fifth lens are sequentially disposed from an object side, wherein a conditional expression -0.1 < f1 / f3 < 1.0 is satisfied, and wherein f1 is a focal length of the first lens, and f3 is a focal length of the third lens.

[0018] An image side surface of the first lens can be concave, and a conditional expression D1 / f < 0.1 can be satisfied, where D1 is a distance on an optical axis between the image side surface of the first lens and an object side surface of the second lens, and f is a focal length of the optical imaging system.

[0019] A conditional expression 80° < FOV can be satisfied, where FOV is a field of view of the optical imaging system.

[0020] A conditional expression TTL / (2 x IMG HT) < 0.57 can be satisfied, where TTL is a distance on an optical axis from an object side surface of the first lens to an image plane, and IMG HT is half of a diagonal length of the image plane.

[0021] The third lens can have a negative refractive power and a concave object side surface.

[0022] A conditional expression 3 < |f4 / f| can be satisfied, where f4 is a focal length of the fourth lens, and f is a focal length of the optical imaging system.

[0023] Other features and aspects will be apparent from the following specific description, the drawings and the claims. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1Ais a configuration diagram showing an optical imaging system according to a first embodiment of the present disclosure.

[0025] Figure 1B is a graph showing aberration characteristics of an optical imaging system according to the first embodiment of the present disclosure.

[0026] Figure 2A is a configuration diagram showing an optical imaging system according to a second embodiment of the present disclosure.

[0027] Figure 2B is a graph showing aberration characteristics of an optical imaging system according to the second embodiment of the present disclosure.

[0028] Figure 3A is a configuration diagram showing an optical imaging system according to a third embodiment of the present disclosure.

[0029] Figure 3B is a graph showing aberration characteristics of an optical imaging system according to the third embodiment of the present disclosure.

[0030] Figure 4A is a configuration diagram showing an optical imaging system according to a fourth embodiment of the present disclosure.

[0031] Figure 4B is a graph showing aberration characteristics of an optical imaging system according to the fourth embodiment of the present disclosure.

[0032] Figure 5A is a configuration diagram showing an optical imaging system according to a fifth embodiment of the present disclosure.

[0033] Figure 5B is a graph showing aberration characteristics of an optical imaging system according to the fifth embodiment of the present disclosure.

[0034] Figure 6A is a configuration diagram showing an optical imaging system according to a sixth embodiment of the present disclosure.

[0035] Figure 6B is a graph showing aberration characteristics of an optical imaging system according to the sixth embodiment of the present disclosure.

[0036] Figure 7A is a configuration diagram showing an optical imaging system according to a seventh embodiment of the present disclosure.

[0037] Figure 7B is a graph showing aberration characteristics of an optical imaging system according to the seventh embodiment of the present disclosure.

[0038] Figure 8A is a configuration diagram showing an optical imaging system according to an eighth embodiment of the present disclosure.

[0039] Figure 8B is a graph showing aberration characteristics of an optical imaging system according to an eighth embodiment of the present disclosure.

[0040] Figure 9A is a configuration diagram showing an optical imaging system according to a ninth embodiment of the present disclosure.

[0041] Figure 9B is a graph showing aberration characteristics of an optical imaging system according to the ninth embodiment of the present disclosure.

[0042] Figure 10A is a configuration diagram showing an optical imaging system according to a second embodiment of the present disclosure.

[0043] Figure 10B is a graph showing aberration characteristics of an optical imaging system according to a tenth embodiment of the present disclosure.

[0044] Throughout the drawings and detailed description, unless otherwise described, like reference numerals refer to like elements. The drawings can not be to scale and the relative dimensions, proportions, and depiction of the elements in the drawings can be exaggerated for clarity, illustration, and convenience. DETAILED DESCRIPTION

[0045] Hereinafter, while examples of the present disclosure will be described in detail with reference to the accompanying drawings, it is noted that the examples are not limited thereto.

[0046] The following detailed description is provided to help the reader obtain a thorough understanding of the methods, apparatuses, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatuses, and / or systems described herein will become apparent to those skilled in the art after understanding the present disclosure. For example, the order of the operations described herein is merely an example, and is not limited to the order set forth herein, but can be changed as will be apparent after understanding the present disclosure, except for operations that must occur in a certain order. Also, descriptions of features known in the art can be omitted in order to improve clarity and conciseness.

[0047] The features described herein can be implemented in different forms and are not to be construed as limited to the examples described herein. Rather, the examples described herein are provided as illustration of some of the many possible ways of implementing the methods, apparatuses, and / or systems described herein after understanding the present disclosure.

[0048] Throughout this specification, when an element (such as a layer, region or substrate) is referred to as being "on" or "connected to" or "coupled to" another element, it can be directly on, directly connected to, or directly coupled to the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is referred to as being "directly on", "directly connected to", or "directly coupled to" another element, there are no other elements interposed therebetween.

[0049] As used herein, the term "and / or" includes any one of the associated listed items, as well as any combination of any two or more of the associated listed items; likewise, "at least one of' includes any one of the associated listed items, as well as any combination of any two or more of the associated listed items.

[0050] Although terms such as "first", "second", and "third" can be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections are not limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section referred to in the examples described herein can also be called a second element, component, region, layer or section without departing from the teachings of the examples.

[0051] For ease of description, spatial relative terms such as "above", "upper", "below", "lower", and the like, can be used herein to describe the relationship of one element to another element as shown in the drawings. Such spatial relative terms in addition to the orientation depicted in the drawings are intended to encompass different orientations of the device in use or operation. For example, if the device in the drawings were turned over, an element described as above or upper relative to another element would then be below or lower relative to the other element. Accordingly, the term "above" encompasses both the above and below orientations depending on the spatial orientation of the device. The device can also be oriented in other ways (e.g., rotated 90 degrees or at other orientations), and the spatial relative terms used herein are to be interpreted accordingly.

[0052] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the present disclosure. As used herein, the articles "a", "an" and "the" are intended to include one or more items, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are intended to be inclusive and allow for other elements, compositions, operations, components, members and / or steps to be present or added, but not excluding the presence or addition of one or more other elements, compositions, operations, components, members and / or steps.

[0053] The shapes illustrated in the drawings can vary due to manufacturing techniques and / or tolerances. Thus, the examples described herein are not limited to the specific shapes illustrated in the drawings, but include variations of the shapes that occur during manufacturing.

[0054] In this document, attention is drawn to the use of the term "may" in relation to examples, for example, an example can include or implement something, means that at least one example includes or implements that feature, but that not all examples are limited to it.

[0055] As will be apparent from understanding this disclosure, features of the examples described herein can be combined in various ways. Also, while the examples described herein have various configurations, other configurations are possible as will be apparent from understanding this disclosure.

[0056] One aspect of the disclosure can provide an optical imaging system having a slim size.

[0057] In an embodiment, the units of values of the radius of curvature, the thickness, the distance, the focal length, the IMG HT (1 / 2 of the diagonal length of the image plane), and the half aperture of the lens can be millimeters (mm), and the unit of the field of view (FOV) can be degrees (°). Also, the thickness of the lens and the distance between the lenses can refer to the thickness and the distance on the optical axis.

[0058] In an embodiment, the object side can refer to a direction in which an object is disposed, and the image side can refer to a direction in which an image plane on which an image is formed is disposed or a direction in which an image sensor is disposed.

[0059] In the description of the lens shape in an embodiment, the configuration in which one of the surfaces is convex can mean that a paraxial region portion of the surface can be convex, and the configuration in which one of the surfaces is concave can mean that a paraxial region portion of the surface can be concave. The paraxial region of a lens surface is a central portion of the lens surface that surrounds an optical axis of the lens surface and includes the optical axis of the lens surface, in which a light ray incident to the lens surface forms a small angle θ with the optical axis, and the approximations of sinθ ≈ θ, tanθ ≈ θ, and cosθ ≈ 1 are valid. Thus, even if one surface of a lens is described as convex, an edge portion of the lens can be concave. Similarly, even if one surface of a lens is described as concave, an edge portion of the lens can be convex.

[0060] The optical imaging system according to the embodiment can be used for a camera of a mobile device. The optical imaging system according to the embodiment can be a camera mounted on a front surface of a mobile device. The mobile device can be implemented as any type of portable electronic device such as a mobile communication terminal, a smart phone, a tablet PC, etc.

[0061] In an embodiment, the optical imaging system can include five lenses. In an embodiment, the optical imaging system can include, in order from the object side, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens.

[0062] Further, the optical imaging system can not only include five lenses, but also can include an image sensor configured to convert incident light into an electrical signal, an infrared blocking filter configured to block light incident in an infrared region on the image sensor, and a diaphragm configured to adjust the amount of light incident on the lenses.

[0063] In an embodiment, the optical imaging system can include lenses formed of a plastic material. In an embodiment, at least one of the first lens to the fifth lens can be formed of a plastic material, and preferably, all of the first lens to the fifth lens can be formed of a plastic material.

[0064] In an embodiment, the optical imaging system can include aspherical lenses. In an embodiment, at least one of the first lens to the fifth lens can be configured as an aspherical lens, for example, two of the first lens to the fifth lens can be configured as aspherical lenses, or for another example, all of the first lens to the fifth lens can be aspherical lenses. At least one surface of the object side surface and the image side surface of one or more aspherical lenses among the first lens to the fifth lens can be aspherical. For example, the object side surface of any one of the one or more aspherical lenses among the first lens to the fifth lens can be aspherical, the image side surface of any one of the one or more aspherical lenses among the first lens to the fifth lens can be aspherical, or both the object side surface and the image side surface of any one of the one or more aspherical lenses among the first lens to the fifth lens can be aspherical. The aspherical surface of the lens can be represented by Equation 1.

[0065] [Equation 1]

[0066]

[0067] In Equation 1, c is the reciprocal of the radius of curvature of the lens, K is the conic constant, and Y can represent the distance from any point on the aspherical surface of the lens to the optical axis. Further, the constants A to H, J, and L to P are aspherical constants of the 4th order to the 30th order in order, and Z is the distance in the optical axis direction between any point on the aspherical surface and the vertex of the aspherical surface.

[0068] In an embodiment, the optical imaging system can satisfy the following conditional expression.

[0069] [Conditional Expression 1] TTL / (2 x IMG HT) ≤ 0.57

[0070] [Condition Expression 2] Fno x {TTL / (2 x IMG HT)} < 1.4

[0071] [Condition Expression 3] 80° < FOV

[0072] [Condition Expression 4] -0.6 < f1 / f2 < 0

[0073] [Condition Expression 5] -0.1 < f1 / f3 < 1.0

[0074] [Condition Expression 6] 0 < v1-v4 < 45

[0075] In [Condition Expression] 1, TTL is a distance from an object side surface of the first lens to an image plane on an optical axis, and IMG HT is half of a diagonal length of the image plane (i.e., 2 x IMG HT is the diagonal length of the image plane). [Condition Expression 1] can relate to a configuration in which the optical imaging system according to the embodiment can have a reduced thickness.

[0076] [Condition Expression 2] is a product of [Condition Expression 1] and Fno (F number of the optical imaging system), and [Condition Expression 2] can relate to a configuration in which the optical imaging system according to the embodiment has a proper level of brightness performance (for a front camera) and can have a reduced thickness.

[0077] In [Condition Expression 3], FOV is a field of view of the optical imaging system, and [Condition Expression 3] can relate to a configuration in which the optical imaging system according to the embodiment can have a proper field of view range (for a front camera).

[0078] In [Condition Expression 4], f1 is a focal length of the first lens, and f2 is a focal length of the second lens. By designing the focal lengths of the first lens and the second lens to satisfy a range of [Condition Expression 4], the optical imaging system according to the embodiment can ensure aberration correction performance.

[0079] In [Condition Expression 5], f1 is a focal length of the first lens, and f3 is a focal length of the third lens. By designing the focal lengths of the first lens and the third lens to satisfy a range of [Condition Expression 5], the optical imaging system according to the embodiment can ensure aberration correction performance.

[0080] In [Condition Expression 6], v1 is an Abbe number of the first lens, and v4 is an Abbe number of the fourth lens. When the first lens and the fourth lens satisfy [Condition Expression 6], chromatic aberration of the optical imaging system according to the embodiment can be reduced.

[0081] In the embodiment, the optical imaging system can also satisfy the following condition expressions.

[0082] [Condition Expression 7] TTL / f < 1.35

[0083] [Condition Expression 8] D1 / f < 0.1

[0084] [Condition Expression 9] 25 < v1-v2 < 45

[0085] [Condition Expression 10] 0 < f1 / f < 1.4

[0086] [Condition Expression 11] -10 < f2 / f < -1

[0087] [Condition Expression 12] 5 < |f3 / f|

[0088] [Condition Expression 13] 3 < |f4 / f|

[0089] [Condition Expression 14] -30 < f5 / f < 0

[0090] [Condition Expression 15] 70° < FOV x (2 x IMG HT) / f

[0091] [Condition Expression 16] 0.26 < ET1 / SD1 < 0.30

[0092] [Condition Expression 17] 0.22 < SD4 / SD10 < 0.27

[0093] [Condition Expression 18] CT2 < 0.19

[0094] In [Condition Expression 7], TTL is a distance on an optical axis from an object side surface of the first lens to an image plane, in [Condition Expression 8], D1 is a distance on the optical axis between the image side surface of the first lens and an object side surface of the second lens, and in [Condition Expression 7] and [Condition Expression 8], f is a focal length of the optical imaging system. [Condition Expression 7] and [Condition Expression 8] can be related to miniaturization of the optical imaging system according to the embodiments.

[0095] In [Condition Expression 9], v1 is an Abbe number of the first lens, and v2 is an Abbe number of the second lens. [Condition Expression 9] can be related to chromatic aberration correction performance of the optical imaging system according to the embodiments.

[0096] In [Conditional Expression 10], f1 is the focal length of the first lens, in [Conditional Expression 11], f2 is the focal length of the second lens, in [Conditional Expression 12], f3 is the focal length of the third lens, in [Conditional Expression 13], f4 is the focal length of the fourth lens, in [Conditional Expression 14], f5 is the focal length of the fifth lens, and in [Conditional Expressions 10] to [Conditional Expression 14], f is the focal length of the optical imaging system. [Conditional Expressions 10] to [Conditional Expression 14] can be related to the aberration correction performance of the optical imaging system according to the embodiments.

[0097] In [Conditional Expression 15], FOV is the field of view of the optical imaging system, IMG HT is half of the diagonal length of the image plane (i.e., 2 x IMG HT is the diagonal length of the image plane), and f is the focal length of the optical imaging system. [Conditional Expression 15] can be related to the features of the optical imaging system according to the embodiments having a reduced thickness and an appropriate field of view range (for a front camera).

[0098] In [Conditional Expression 16], ET1 is the thickness of the edge portion of the first lens, and SD1 is the half aperture radius of the object side surface of the first lens. [Conditional Expression 16] can be related to the aberration correction performance of the optical imaging system according to the embodiments.

[0099] In [Conditional Expression 17], SD4 is the half aperture radius of the image side surface of the second lens, SD10 is the half aperture radius of the image side surface of the fifth lens, and CT2 in [Conditional Expression 18] is the central thickness (thickness on the optical axis) of the second lens. [Conditional Expression 17] and [Conditional Expression 18] can be related to the shape conditions of the second lens to ensure the resolution of the optical imaging system according to the embodiments.

[0100] Hereinafter, the optical imaging system according to the embodiments can be described with reference to the accompanying drawings.

[0101] <First Embodiment>

[0102] Figure 1A is a configuration diagram illustrating the optical imaging system according to the first embodiment. Figure 1B is a graph representing the aberration characteristics of the optical imaging system according to the first embodiment.

[0103] According to the first embodiment, the optical imaging system 100 can include the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, and the fifth lens 150 disposed in order from the object side, and can further include the infrared blocking filter F and the image sensor IP disposed on the image side of the fifth lens 150.

[0104] Further, although not shown in the drawings, a diaphragm can be provided between the object side and the image side of the first lens 110, and a spacer can be provided between the second lens 120 and the third lens 130.

[0105] The first lens 110 can have a positive refractive power. The focal length of the first lens 110 can be 2.0 mm or more. The object side of the first lens 110 can be convex in a paraxial region, and the image side of the first lens 110 can be concave in the paraxial region. The first lens 110 can be formed of a plastic material. The Abbe number of the first lens 110 can be 50 or more. The first lens 110 can be configured as an aspherical lens. For example, the object side and the image side of the first lens 110 can be aspherical.

[0106] The second lens 120 can have a negative refractive power. The focal length of the second lens 120 can be -6.0 mm or less. The object side of the second lens 120 can be convex in a paraxial region, and the image side of the second lens 120 can be concave in the paraxial region. The second lens 120 can be formed of a plastic material. For example, the second lens 120 can be formed of a plastic material having optical properties (e.g., refractive index and Abbe number) different from those of the first lens 110. The Abbe number of the second lens 120 can be less than 20. The second lens 120 can be configured as an aspherical lens. For example, the object side and the image side of the second lens 120 can be aspherical.

[0107] The third lens 130 can have a positive refractive power. The focal length of the third lens 130 can be 18.0 mm or more. The object side of the third lens 130 can be convex in a paraxial region, and the image side of the third lens 130 can be concave in the paraxial region. The third lens 130 can be formed of a plastic material. For example, the third lens 130 can be formed of a plastic material having optical properties (e.g., refractive index and Abbe number) identical to those of the second lens 120. The Abbe number of the third lens 130 can be less than 20. The third lens 130 can be configured as an aspherical lens. For example, the object side and the image side of the third lens 130 can be aspherical.

[0108] The fourth lens 140 can have a positive refractive power. The focal length of the fourth lens 140 can be 10.0 mm or more. The object side surface of the fourth lens 140 can be concave in a paraxial region, and the image side surface of the fourth lens 140 can be convex in the paraxial region. The fourth lens 140 can be formed of a plastic material. For example, the fourth lens 140 can be formed of a plastic material having optical properties (e.g., refractive index and Abbe number) different from those of the third lens 130. The Abbe number of the fourth lens 140 can be 10 or more, and can be less than that of the first lens 110. The fourth lens 140 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the fourth lens 140 can be aspheric.

[0109] The fifth lens 150 can have a negative refractive power. The focal length of the fifth lens 150 can be less than -1.0 mm. The object side surface of the fifth lens 150 can be convex, and the image side surface of the fifth lens 150 can be concave. The fifth lens 150 can be formed of a plastic material. For example, the fifth lens 150 can be formed of a plastic material having optical properties (e.g., refractive index and Abbe number) different from those of the fourth lens 140. The Abbe number of the fifth lens 150 can be 50 or more. The fifth lens 150 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the fifth lens 150 can be aspheric.

[0110] The focal length of the optical imaging system 100 according to the first embodiment can be 2.937 mm, the Fno can be 2.290, the FOV can be 85.480°, and the TTL can be 3.131 mm.

[0111] Table 1 below lists optical and physical parameters of the optical imaging system 100 according to the first embodiment.

[0112] [Table 1]

[0113] Face No. Radius of Curvature Thickness / Distance Refractive Index Abbe Number Focal Length Effective Radius Object Infinity Infinity 1 Infinity -0.259 2 0.916 0.393 1.544 56.00 2.342 0.630 3 2.739 0.072 0.588 4 13.451 0.162 1.671 19.40 -6.430 0.567 5 3.280 0.093 0.504 6 Infinity 0.090 7 13.742 0.173 1.671 19.40 33.522 0.581 8 34.513 0.435 0.699 9 -32.519 0.223 1.567 37.40 41.126 1.020 10 -13.666 0.211 1.222 11 1.398 0.423 1.535 55.70 -7.601 1.866 12 0.931 0.193 1.994 13 Infinity 0.110 1.517 64.20 14 Infinity 0.552 Image Plane Infinity

[0114] Table 2 below lists aspheric data of the optical imaging system 100 according to the first embodiment.

[0115] [Table 2]

[0116]

[0117]

[0118] <Second Embodiment>

[0119] Figure 2A FIG. 1 is a configuration diagram illustrating an optical imaging system according to a second embodiment. Figure 2Bis a graph showing an aberration characteristic of the optical imaging system according to the second embodiment.

[0120] According to the second embodiment, the optical imaging system 200 can include a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, and a fifth lens 250 disposed in this order from an object side, and can further include an infrared blocking filter F and an image sensor IP disposed on an image side of the fifth lens 250.

[0121] Further, although not shown in the drawings, a diaphragm can be disposed on the object side of the first lens 210, and a spacer can be disposed between the second lens 220 and the third lens 230.

[0122] The first lens 210 can have a positive refractive power. The focal length of the first lens 210 can be 2.0 mm or more. The object side surface of the first lens 210 can be convex in the paraxial region, and the image side surface of the first lens 210 can be concave in the paraxial region. The first lens 210 can be formed of a plastic material. The Abbe number of the first lens 210 can be 50 or more. The first lens 210 can be configured as an aspherical lens. For example, the object side surface and the image side surface of the first lens 210 can be aspherical.

[0123] The second lens 220 can have a negative refractive power. The focal length of the second lens 220 can be -6.0 mm or less. The object side surface of the second lens 220 can be convex in the paraxial region, and the image side surface of the second lens 220 can be concave in the paraxial region. The second lens 220 can be formed of a plastic material. For example, the second lens 220 can be formed of a plastic material having optical characteristics (e.g., refractive index and Abbe number) different from those of the first lens 210. The Abbe number of the second lens 220 can be less than 20. The second lens 220 can be configured as an aspherical lens. For example, the object side surface and the image side surface of the second lens 220 can be aspherical.

[0124] The third lens 230 can have a negative refractive power. The focal length of the third lens 230 can be -40.0 mm or less. The object side surface of the third lens 230 can be concave in the paraxial region, and the image side surface of the third lens 230 can be convex in the paraxial region. The third lens 230 can be formed of a plastic material. For example, the third lens 230 can be formed of a plastic material having optical characteristics (e.g., refractive index and Abbe number) identical to those of the second lens 220. The Abbe number of the third lens 230 can be less than 20. The third lens 230 can be configured as an aspherical lens. For example, the object side surface and the image side surface of the third lens 230 can be aspherical.

[0125] The fourth lens 240 can have a negative refractive power. The focal length of the fourth lens 240 can be -10.0 mm or less. The object side surface of the fourth lens 240 can be convex in the paraxial region, and the image side surface of the fourth lens 240 can be concave in the paraxial region. The fourth lens 240 can be formed of a plastic material. For example, the fourth lens 240 can be formed of a plastic material having optical properties (e.g., refractive index and Abbe number) different from those of the third lens 230. The Abbe number of the fourth lens 240 can be 10 or more and can be less than that of the first lens 210. The fourth lens 240 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the fourth lens 240 can be aspheric.

[0126] The fifth lens 250 can have a negative refractive power. The focal length of the fifth lens 250 can be less than -1.0 mm. The object side surface of the fifth lens 250 can be convex, and the image side surface of the fifth lens 250 can be concave. The fifth lens 250 can be formed of a plastic material. For example, the fifth lens 250 can be formed of a plastic material having optical properties (e.g., refractive index and Abbe number) different from those of the fourth lens 240. The Abbe number of the fifth lens 250 can be 50 or more. The fifth lens 250 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the fifth lens 250 can be aspheric.

[0127] The focal length of the optical imaging system 200 according to the second embodiment can be 2.898 mm, the Fno can be 2.300, the FOV can be 85.897°, and the TTL can be 3.150 mm.

[0128] Table 3 below lists optical and physical parameters of the optical imaging system 200 according to the second embodiment.

[0129] [Table 3]

[0130]

[0131] Table 4 below lists aspheric data of the optical imaging system 200 according to the second embodiment.

[0132] [Table 4]

[0133]

[0134]

[0135] [Third Embodiment]

[0136] Figure 3A FIG. 1 is a configuration diagram illustrating an optical imaging system according to a third embodiment. Figure 3Bis a graph showing an aberration characteristic of the optical imaging system according to the third embodiment.

[0137] According to the third embodiment, the optical imaging system 300 can include a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, and a fifth lens 350 disposed in this order from an object side, and can further include an infrared blocking filter F and an image sensor IP disposed on an image side of the fifth lens 350.

[0138] Further, although not shown in the drawings, a diaphragm can be disposed on the object side of the first lens 310, and a spacer can be disposed between the second lens 320 and the third lens 330.

[0139] The first lens 310 can have a positive refractive power. The focal length of the first lens 310 can be 2.0 mm or more. The object side surface of the first lens 310 can be convex in the paraxial region, and the image side surface of the first lens 310 can be concave in the paraxial region. The first lens 310 can be formed of a plastic material. The Abbe number of the first lens 310 can be 50 or more. The first lens 310 can be configured as an aspherical lens. For example, the object side surface and the image side surface of the first lens 310 can be aspherical.

[0140] The second lens 320 can have a negative refractive power. The focal length of the second lens 320 can be -6.0 mm or less. The object side surface of the second lens 320 can be convex in the paraxial region, and the image side surface of the second lens 320 can be concave in the paraxial region. The second lens 320 can be formed of a plastic material. For example, the second lens 320 can be formed of a plastic material having optical characteristics (e.g., refractive index and Abbe number) different from those of the first lens 310. The Abbe number of the second lens 320 can be less than 20. The second lens 320 can be configured as an aspherical lens. For example, the object side surface and the image side surface of the second lens 320 can be aspherical.

[0141] The third lens 330 can have a negative refractive power. The focal length of the third lens 330 can be -40.0 mm or less. The object side surface of the third lens 330 can be concave in the paraxial region, and the image side surface of the third lens 330 can be convex in the paraxial region. The third lens 330 can be formed of a plastic material. For example, the third lens 330 can be formed of a plastic material having optical characteristics (e.g., refractive index and Abbe number) identical to those of the second lens 320. The Abbe number of the third lens 330 can be less than 20. The third lens 330 can be configured as an aspherical lens. For example, the object side surface and the image side surface of the third lens 330 can be aspherical.

[0142] The fourth lens 340 can have a positive refractive power. The focal length of the fourth lens 340 can be 10.0 mm or more. The object side surface of the fourth lens 340 can be concave in a paraxial region, and the image side surface of the fourth lens 340 can be convex in the paraxial region. The fourth lens 340 can be formed of a plastic material. For example, the fourth lens 340 can be formed of a plastic material having optical properties (e.g., refractive index and Abbe number) different from those of the third lens 330. The Abbe number of the fourth lens 340 can be 10 or more and can be less than that of the first lens 310. The fourth lens 340 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the fourth lens 340 can be aspheric.

[0143] The fifth lens 350 can have a negative refractive power. The focal length of the fifth lens 350 can be less than -1.0 mm. The object side surface of the fifth lens 350 can be convex, and the image side surface of the fifth lens 350 can be concave. The fifth lens 350 can be formed of a plastic material. For example, the fifth lens 350 can be formed of a plastic material having optical properties (e.g., refractive index and Abbe number) different from those of the fourth lens 340. The Abbe number of the fifth lens 350 can be 50 or more. The fifth lens 350 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the fifth lens 350 can be aspheric.

[0144] The focal length of the optical imaging system 300 according to the third embodiment can be 2.927 mm, the Fno can be 2.320, the FOV can be 85.480°, and the TTL can be 3.150 mm.

[0145] Table 5 below lists optical and physical parameters of the optical imaging system 300 according to the third embodiment.

[0146] [Table 5]

[0147]

[0148]

[0149] Table 6 below lists aspheric data of the optical imaging system 300 according to the third embodiment.

[0150] [Table 6]

[0151]

[0152]

[0153] <Fourth Embodiment>

[0154] Figure 4Ais a configuration diagram illustrating an optical imaging system according to a fourth embodiment. Figure 4B is a graph representing an aberration characteristic of the optical imaging system according to the fourth embodiment.

[0155] According to the fourth embodiment, the optical imaging system 400 can include a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, and a fifth lens 450 disposed in this order from an object side, and can further include an infrared blocking filter F and an image sensor IP disposed on an image side of the fifth lens 450.

[0156] Further, a diaphragm can be disposed between an object side surface and an image side surface of the first lens 410, and a spacer can be disposed between the second lens 420 and the third lens 430.

[0157] The first lens 410 can have a positive refractive power. The focal length of the first lens 410 can be 2.0 mm or more. The object side surface of the first lens 410 can be convex in a paraxial region, and the image side surface of the first lens 410 can be concave in the paraxial region. The first lens 410 can be formed of a plastic material. The Abbe number of the first lens 410 can be 50 or more. The first lens 410 can be configured as an aspherical lens. For example, the object side surface and the image side surface of the first lens 410 can be aspherical.

[0158] The second lens 420 can have a negative refractive power. The focal length of the second lens 420 can be -6.0 mm or less. The object side surface and the image side surface of the second lens 420 can be concave in a paraxial region. The second lens 420 can be formed of a plastic material. For example, the second lens 420 can be formed of a plastic material having optical characteristics (e.g., refractive index and Abbe number) different from those of the first lens 410. The Abbe number of the second lens 420 can be less than 20. The second lens 420 can be configured as an aspherical lens. For example, the object side surface and the image side surface of the second lens 420 can be aspherical.

[0159] The third lens 430 can have a positive refractive power. The focal length of the third lens 430 can be 18.0 mm or more. The object side surface of the third lens 430 can be convex in a paraxial region, and the image side surface of the third lens 430 can be concave in the paraxial region. The third lens 430 can be formed of a plastic material. For example, the third lens 430 can be formed of a plastic material having optical characteristics (e.g., refractive index and Abbe number) identical to those of the second lens 420. The Abbe number of the third lens 430 can be less than 20. The third lens 430 can be configured as an aspherical lens. For example, the object side surface and the image side surface of the third lens 430 can be aspherical.

[0160] The fourth lens 440 can have a positive refractive power. The focal length of the fourth lens 440 can be 10.0 mm or more. The object side surface of the fourth lens 440 can be concave in a paraxial region, and the image side surface of the fourth lens 440 can be convex in the paraxial region. The fourth lens 440 can be formed of a plastic material. For example, the fourth lens 440 can be formed of a plastic material having optical properties (e.g., refractive index and Abbe number) different from those of the third lens 430. The Abbe number of the fourth lens 440 can be 10 or more and can be less than that of the first lens 410. The fourth lens 440 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the fourth lens 440 can be aspheric.

[0161] The fifth lens 450 can have a negative refractive power. The focal length of the fifth lens 450 can be less than -1.0 mm. The object side surface of the fifth lens 450 can be convex, and the image side surface of the fifth lens 450 can be concave. The fifth lens 450 can be formed of a plastic material. For example, the fifth lens 450 can be formed of a plastic material having optical properties (e.g., refractive index and Abbe number) different from those of the fourth lens 440. The Abbe number of the fifth lens 450 can be 50 or more. The fifth lens 450 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the fifth lens 450 can be aspheric.

[0162] The focal length of the optical imaging system 400 according to the fourth embodiment can be 2.927 mm, the Fno can be 2.282, the FOV can be 85.479°, and the TTL can be 3.060 mm.

[0163] Table 7 below lists optical and physical parameters of the optical imaging system 400 according to the fourth embodiment.

[0164] [Table 7]

[0165] Face No. Radius of Curvature Thickness / Distance Refractive Index Abbe Number Focal Length Effective Radius Object Infinity Infinity 1 Infinity -0.251 2 0.872 0.409 1.544 56.00 2.317 0.641 3 2.339 0.077 0.584 4 -72.247 0.151 1.671 19.40 -6.445 0.562 5 4.661 0.090 0.504 6 Infinity 0.067 7 10.235 0.176 1.671 19.40 23.722 0.579 8 27.889 0.420 0.718 9 -21.922 0.210 1.567 37.40 26.285 0.981 10 -8.938 0.234 1.166 11 1.564 0.383 1.535 55.70 -5.724 1.813 12 0.948 0.224 1.972 13 Infinity 0.110 1.517 64.20 14 Infinity 0.509 Image Plane Infinity

[0166] Table 8 below lists aspheric data of the optical imaging system 400 according to the fourth embodiment.

[0167] [Table 8]

[0168]

[0169]

[0170] [Fifth Embodiment]

[0171] Figure 5A FIG. 1 is a configuration diagram illustrating an optical imaging system according to a fifth embodiment. Figure 5Bis a graph showing an aberration characteristic of the optical imaging system according to the fifth embodiment.

[0172] According to the fifth embodiment, the optical imaging system 500 can include a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, and a fifth lens 550 disposed in this order from an object side, and can further include an infrared blocking filter F and an image sensor IP disposed on an image side of the fifth lens 550.

[0173] Further, a diaphragm can be disposed between an object side surface and an image side surface of the first lens 510, and a spacer can be disposed between the second lens 520 and the third lens 530.

[0174] The first lens 510 can have a positive refractive power. The focal length of the first lens 510 can be 2.0 mm or more. The object side surface of the first lens 510 can be convex in a paraxial region, and the image side surface of the first lens 510 can be concave in the paraxial region. The first lens 510 can be formed of a plastic material. The Abbe number of the first lens 510 can be 50 or more. The first lens 510 can be configured as an aspherical lens. For example, the object side surface and the image side surface of the first lens 510 can be aspherical.

[0175] The second lens 520 can have a negative refractive power. The focal length of the second lens 520 can be -6.0 mm or less. The object side surface and the image side surface of the second lens 520 can be concave in a paraxial region. The second lens 520 can be formed of a plastic material. For example, the second lens 520 can be formed of a plastic material having optical characteristics (e.g., refractive index and Abbe number) different from those of the first lens 510. The Abbe number of the second lens 520 can be less than 20. The second lens 520 can be configured as an aspherical lens. For example, the object side surface and the image side surface of the second lens 520 can be aspherical.

[0176] The third lens 530 can have a positive refractive power. The focal length of the third lens 530 can be 18.0 mm or more. The object side surface of the third lens 530 can be convex in a paraxial region, and the image side surface of the third lens 530 can be concave in the paraxial region. The third lens 530 can be formed of a plastic material. For example, the third lens 530 can be formed of a plastic material having optical characteristics (e.g., refractive index and Abbe number) identical to those of the second lens 520. The Abbe number of the third lens 530 can be less than 20. The third lens 530 can be configured as an aspherical lens. For example, the object side surface and the image side surface of the third lens 530 can be aspherical.

[0177] The fourth lens 540 can have a positive refractive power. The focal length of the fourth lens 540 can be 10.0 mm or more. The object side surface of the fourth lens 540 can be concave in a paraxial region, and the image side surface of the fourth lens 540 can be convex in the paraxial region. The fourth lens 540 can be formed of a plastic material. For example, the fourth lens 540 can be formed of a plastic material having optical properties (e.g., refractive index and Abbe number) different from those of the third lens 530. The Abbe number of the fourth lens 540 can be 10 or more and can be less than that of the first lens 510. The fourth lens 540 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the fourth lens 540 can be aspheric.

[0178] The fifth lens 550 can have a negative refractive power. The focal length of the fifth lens 550 can be less than -1.0 mm. The object side surface of the fifth lens 550 can be convex, and the image side surface of the fifth lens 550 can be concave. The fifth lens 550 can be formed of a plastic material. For example, the fifth lens 550 can be formed of a plastic material having optical properties (e.g., refractive index and Abbe number) different from those of the fourth lens 540. The Abbe number of the fifth lens 550 can be 50 or more. The fifth lens 550 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the fifth lens 550 can be aspheric.

[0179] The focal length of the optical imaging system 500 according to the fifth embodiment can be 2.927 mm, the Fno can be 2.289, the FOV can be 85.498°, and the TTL can be 3.050 mm.

[0180] Table 9 below lists optical and physical parameters of the optical imaging system 500 according to the fifth embodiment.

[0181] [Table 9]

[0182]

[0183] Table 10 below lists aspheric data of the optical imaging system 500 according to the fifth embodiment.

[0184] [Table 10]

[0185]

[0186]

[0187] <SIXTH EMBODIMENT>

[0188] Figure 6A FIG. 6 is a configuration diagram illustrating an optical imaging system according to a sixth embodiment. Figure 6Bis a graph showing an aberration characteristic of the optical imaging system according to the sixth embodiment.

[0189] According to the sixth embodiment, the optical imaging system 600 can include a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, and a fifth lens 650 disposed in this order from an object side, and can further include an infrared blocking filter F and an image sensor IP disposed on an image side of the fifth lens 650.

[0190] Further, a diaphragm can be disposed between the object side surface and the image side surface of the first lens 610, and a spacer can be disposed between the second lens 620 and the third lens 630.

[0191] The first lens 610 can have a positive refractive power. The focal length of the first lens 610 can be 2.0 mm or more. The object side surface of the first lens 610 can be convex in a paraxial region, and the image side surface of the first lens 610 can be concave in the paraxial region. The first lens 610 can be formed of a plastic material. The Abbe number of the first lens 610 can be 50 or more. The first lens 610 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the first lens 610 can be aspheric.

[0192] The second lens 620 can have a negative refractive power. The focal length of the second lens 620 can be -6.0 mm or less. The object side surface and the image side surface of the second lens 620 can be concave in a paraxial region. The second lens 620 can be formed of a plastic material. For example, the second lens 620 can be formed of a plastic material having optical characteristics (e.g., refractive index and Abbe number) different from those of the first lens 610. The Abbe number of the second lens 620 can be less than 20. The second lens 620 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the second lens 620 can be aspheric.

[0193] The third lens 630 can have a positive refractive power. The focal length of the third lens 630 can be 18.0 mm or more. The object side surface of the third lens 630 can be convex in a paraxial region, and the image side surface of the third lens 630 can be concave in the paraxial region. The third lens 630 can be formed of a plastic material. For example, the third lens 630 can be formed of a plastic material having optical characteristics (e.g., refractive index and Abbe number) identical to those of the second lens 620. The Abbe number of the third lens 630 can be less than 20. The third lens 630 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the third lens 630 can be aspheric.

[0194] The fourth lens 640 can have a positive refractive power. The focal length of the fourth lens 640 can be 10.0 mm or more. The object side surface of the fourth lens 640 can be concave in a paraxial region, and the image side surface of the fourth lens 640 can be convex in the paraxial region. The fourth lens 640 can be formed of a plastic material. For example, the fourth lens 640 can be formed of a plastic material having optical properties (e.g., refractive index and Abbe number) different from those of the third lens 630. The Abbe number of the fourth lens 640 can be 10 or more and can be less than that of the first lens 610. The fourth lens 640 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the fourth lens 640 can be aspheric.

[0195] The fifth lens 650 can have a negative refractive power. The focal length of the fifth lens 650 can be less than -1.0 mm. The object side surface of the fifth lens 650 can be convex, and the image side surface of the fifth lens 650 can be concave. The fifth lens 650 can be formed of a plastic material. For example, the fifth lens 650 can be formed of a plastic material having optical properties (e.g., refractive index and Abbe number) different from those of the fourth lens 640. The Abbe number of the fifth lens 650 can be 50 or more. The fifth lens 650 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the fifth lens 650 can be aspheric.

[0196] The focal length of the optical imaging system 600 according to the sixth embodiment can be 2.927 mm, the Fno can be 2.289, the FOV can be 85.499°, and the TTL can be 3.040 mm.

[0197] Table 11 below lists the optical and physical parameters of the optical imaging system 600 according to the sixth embodiment.

[0198] [Table 11]

[0199]

[0200]

[0201] Table 12 below lists the aspheric data of the optical imaging system 600 according to the sixth embodiment.

[0202] [Table 12]

[0203]

[0204]

[0205] <Seventh Embodiment>

[0206] Figure 7Ais a configuration diagram illustrating an optical imaging system according to a seventh embodiment. Figure 7B is a graph representing an aberration characteristic of the optical imaging system according to the seventh embodiment.

[0207] According to the seventh embodiment, the optical imaging system 700 can include a first lens 710, a second lens 720, a third lens 730, a fourth lens 740, and a fifth lens 750 disposed in this order from an object side, and can further include an infrared blocking filter F and an image sensor IP disposed on an image side of the fifth lens 750.

[0208] Further, a diaphragm can be disposed between an object side surface and an image side surface of the first lens 710, and a spacer can be disposed between the second lens 720 and the third lens 730.

[0209] The first lens 710 can have a positive refractive power. The focal length of the first lens 710 can be 2.0 mm or more. The object side surface of the first lens 710 can be convex in a paraxial region, and the image side surface of the first lens 710 can be concave in the paraxial region. The first lens 710 can be formed of a plastic material. The Abbe number of the first lens 710 can be 50 or more. The first lens 710 can be configured as an aspherical lens. For example, the object side surface and the image side surface of the first lens 710 can be aspherical.

[0210] The second lens 720 can have a negative refractive power. The focal length of the second lens 720 can be -6.0 mm or less. The object side surface and the image side surface of the second lens 720 can be concave in a paraxial region. The second lens 720 can be formed of a plastic material. For example, the second lens 720 can be formed of a plastic material having optical characteristics (e.g., refractive index and Abbe number) different from those of the first lens 710. The Abbe number of the second lens 720 can be less than 20. The second lens 720 can be configured as an aspherical lens. For example, the object side surface and the image side surface of the second lens 720 can be aspherical.

[0211] The third lens 730 can have a positive refractive power. The focal length of the third lens 730 can be 18.0 mm or more. The object side surface and the image side surface of the third lens 730 can be convex in a paraxial region. The third lens 730 can be formed of a plastic material. For example, the third lens 730 can be formed of a plastic material having optical characteristics (e.g., refractive index and Abbe number) identical to those of the second lens 720. The Abbe number of the third lens 730 can be less than 20. The third lens 730 can be configured as an aspherical lens. For example, the object side surface and the image side surface of the third lens 730 can be aspherical.

[0212] The fourth lens 740 can have a positive refractive power. The focal length of the fourth lens 740 can be 10.0 mm or more. The object side surface of the fourth lens 740 can be concave in a paraxial region, and the image side surface of the fourth lens 740 can be convex in the paraxial region. The fourth lens 740 can be formed of a plastic material. For example, the fourth lens 740 can be formed of a plastic material having optical properties (e.g., refractive index and Abbe number) different from those of the third lens 730. The Abbe number of the fourth lens 740 can be 10 or more and can be less than that of the first lens 710. The fourth lens 740 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the fourth lens 740 can be aspheric.

[0213] The fifth lens 750 can have a negative refractive power. The focal length of the fifth lens 750 can be less than -1.0 mm. The object side surface of the fifth lens 750 can be convex, and the image side surface of the fifth lens 750 can be concave. The fifth lens 750 can be formed of a plastic material. For example, the fifth lens 750 can be formed of a plastic material having optical properties (e.g., refractive index and Abbe number) different from those of the fourth lens 740. The Abbe number of the fifth lens 750 can be 50 or more. The fifth lens 750 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the fifth lens 750 can be aspheric.

[0214] The optical imaging system 700 according to the seventh embodiment can have a focal length of 2.915 mm, an Fno of 2.289, a FOV of 85.496°, and a TTL of 3.090 mm.

[0215] Table 13 below lists optical and physical parameters of the optical imaging system 700 according to the seventh embodiment.

[0216] [Table 13]

[0217]

[0218] Table 14 below lists aspheric data of the optical imaging system 700 according to the seventh embodiment.

[0219] [Table 14]

[0220]

[0221]

[0222] <Eighth Embodiment>

[0223] Figure 8A FIG. 1 is a configuration diagram illustrating an optical imaging system according to an eighth embodiment. Figure 8Bis a graph showing an aberration characteristic of an optical imaging system according to the eighth embodiment.

[0224] According to the eighth embodiment, the optical imaging system 800 can include a first lens 810, a second lens 820, a third lens 830, a fourth lens 840, and a fifth lens 850 disposed in this order from an object side, and can further include an infrared blocking filter F and an image sensor IP disposed on an image side of the fifth lens 850.

[0225] Further, a stop can be disposed between the object side surface and the image side surface of the first lens 810, and a spacer can be disposed between the second lens 820 and the third lens 830.

[0226] The first lens 810 can have a positive refractive power. The focal length of the first lens 810 can be 2.0 mm or more. The object side surface of the first lens 810 can be convex in a paraxial region, and the image side surface of the first lens 810 can be concave in the paraxial region. The first lens 810 can be formed of a plastic material. The Abbe number of the first lens 810 can be 50 or more. The first lens 810 can be configured as an aspherical lens. For example, the object side surface and the image side surface of the first lens 810 can be aspherical.

[0227] The second lens 820 can have a negative refractive power. The focal length of the second lens 820 can be -6.0 mm or less. The object side surface of the second lens 820 can be convex in a paraxial region, and the image side surface of the second lens 820 can be concave in the paraxial region. The second lens 820 can be formed of a plastic material. For example, the second lens 820 can be formed of a plastic material having optical characteristics (e.g., refractive index and Abbe number) different from those of the first lens 810. The Abbe number of the second lens 820 can be less than 20. The second lens 820 can be configured as an aspherical lens. For example, the object side surface and the image side surface of the second lens 820 can be aspherical.

[0228] The third lens 830 can have a positive refractive power. The focal length of the third lens 830 can be 18.0 mm or more. The object side surface of the third lens 830 can be convex in a paraxial region, and the image side surface of the third lens 830 can be concave in the paraxial region. The third lens 830 can be formed of a plastic material. For example, the third lens 830 can be formed of a plastic material having optical characteristics (e.g., refractive index and Abbe number) identical to those of the second lens 820. The Abbe number of the third lens 830 can be less than 20. The third lens 830 can be configured as an aspherical lens. For example, the object side surface and the image side surface of the third lens 830 can be aspherical.

[0229] The fourth lens 840 can have a positive refractive power. The focal length of the fourth lens 840 can be 10.0 mm or more. The object side surface and the image side surface of the fourth lens 840 can be convex in a paraxial region. The fourth lens 840 can be formed of a plastic material. For example, the fourth lens 840 can be formed of a plastic material having optical properties (e.g., refractive index and Abbe number) different from those of the third lens 830. The Abbe number of the fourth lens 840 can be 10 or more and can be less than that of the first lens 810. The fourth lens 840 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the fourth lens 840 can be aspheric.

[0230] The fifth lens 850 can have a negative refractive power. The focal length of the fifth lens 850 can be less than -1.0 mm. The object side surface of the fifth lens 850 can be convex, and the image side surface of the fifth lens 850 can be concave. The fifth lens 850 can be formed of a plastic material. For example, the fifth lens 850 can be formed of a plastic material having optical properties (e.g., refractive index and Abbe number) different from those of the fourth lens 840. The Abbe number of the fifth lens 850 can be 50 or more. The fifth lens 850 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the fifth lens 850 can be aspheric.

[0231] The optical imaging system 800 according to the eighth embodiment can have a focal length of 2.927 mm, an Fno of 2.290, a FOV of 85.488°, and a TTL of 3.060 mm.

[0232] Table 15 below lists optical and physical parameters of the optical imaging system 800 according to the eighth embodiment.

[0233] [Table 15]

[0234] Face No. Radius of Curvature Thickness / Distance Refractive Index Abbe Number Focal Length Effective Radius Object Infinity Infinity 1 Infinity -0.255 2 0.893 0.397 1.544 56.00 2.341 0.639 3 2.492 0.068 0.593 4 26.971 0.170 1.671 19.40 -7.005 0.570 5 4.033 0.094 0.501 6 Infinity 0.081 7 18.351 0.175 1.671 19.40 34.958 0.568 8 80.610 0.435 0.693 9 14.860 0.210 1.567 37.40 12.650 1.014 10 -13.971 0.273 1.193 11 1.811 0.352 1.535 55.70 -4.399 1.828 12 0.955 0.182 1.973 13 Infinity 0.110 1.517 64.20 14 Infinity 0.514 Image Plane Infinity

[0235] Table 16 below lists aspheric data of the optical imaging system 800 according to the eighth embodiment.

[0236] [Table 16]

[0237]

[0238] <Ninth Embodiment>

[0239] Figure 9A FIG. 9 is a configuration diagram illustrating an optical imaging system according to a ninth embodiment. Figure 9B FIG. 10 is a graph representing aberration characteristics of the optical imaging system according to the ninth embodiment.

[0240] According to a ninth embodiment, the optical imaging system 900 can include a first lens 910, a second lens 920, a third lens 930, a fourth lens 940, and a fifth lens 950 disposed in order from an object side, and can further include an infrared blocking filter F and an image sensor IP disposed on an image side of the fifth lens 950.

[0241] Further, although not shown in the drawings, a diaphragm can be disposed between the object side and the image side of the first lens 910, and a spacer can be disposed between the second lens 920 and the third lens 930.

[0242] The first lens 910 can have a positive refractive power. The focal length of the first lens 910 can be 2.0 mm or more. The object side surface of the first lens 910 can be convex in a paraxial region, and the image side surface of the first lens 910 can be concave in the paraxial region. The first lens 910 can be formed of a plastic material. The Abbe number of the first lens 910 can be 50 or more. The first lens 910 can be configured as an aspherical lens. For example, the object side surface and the image side surface of the first lens 910 can be aspherical.

[0243] The second lens 920 can have a negative refractive power. The focal length of the second lens 920 can be -6.0 mm or less. The object side surface of the second lens 920 can be convex in a paraxial region, and the image side surface of the second lens 920 can be concave in the paraxial region. The second lens 920 can be formed of a plastic material. For example, the second lens 920 can be formed of a plastic material having optical properties (e.g., refractive index and Abbe number) different from those of the first lens 910. The Abbe number of the second lens 920 can be less than 20. The second lens 920 can be configured as an aspherical lens. For example, the object side surface and the image side surface of the second lens 920 can be aspherical.

[0244] The third lens 930 can have a positive refractive power. The focal length of the third lens 930 can be 18.0 mm or more. The object side surface of the third lens 930 can be convex in a paraxial region, and the image side surface of the third lens 930 can be concave in the paraxial region. The third lens 930 can be formed of a plastic material. For example, the third lens 930 can be formed of a plastic material having optical properties (e.g., refractive index and Abbe number) identical to those of the second lens 920. The Abbe number of the third lens 930 can be less than 20. The third lens 930 can be configured as an aspherical lens. For example, the object side surface and the image side surface of the third lens 930 can be aspherical.

[0245] The fourth lens 940 can have a positive refractive power. The focal length of the fourth lens 940 can be 10.0 mm or more. The object side surface of the fourth lens 940 can be concave in a paraxial region, and the image side surface of the fourth lens 940 can be convex in the paraxial region. The fourth lens 940 can be formed of a plastic material. For example, the fourth lens 940 can be formed of a plastic material having optical properties (e.g., refractive index and Abbe number) different from those of the third lens 930. The Abbe number of the fourth lens 940 can be 10 or more and can be less than that of the first lens 910. The fourth lens 940 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the fourth lens 940 can be aspheric.

[0246] The fifth lens 950 can have a negative refractive power. The focal length of the fifth lens 950 can be less than -1.0 mm. The object side surface of the fifth lens 950 can be convex, and the image side surface of the fifth lens 950 can be concave. The fifth lens 950 can be formed of a plastic material. For example, the fifth lens 950 can be formed of a plastic material having optical properties (e.g., refractive index and Abbe number) different from those of the fourth lens 940. The Abbe number of the fifth lens 950 can be 50 or more. The fifth lens 950 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the fifth lens 950 can be aspheric.

[0247] The focal length of the optical imaging system 900 according to the ninth embodiment can be 2.937 mm, the Fno can be 2.288, the FOV can be 85.487°, and the TTL can be 3.110 mm.

[0248] Table 17 below lists optical and physical parameters of the optical imaging system 900 according to the ninth embodiment.

[0249] [Table 17]

[0250]

[0251]

[0252] Table 18 below lists aspheric data of the optical imaging system 900 according to the ninth embodiment.

[0253] [Table 18]

[0254]

[0255]

[0256] <TENTH EMBODIMENT>

[0257] Figure 10Ais a configuration diagram illustrating an optical imaging system according to the tenth embodiment. Figure 10B is a graph representing an aberration characteristic of the optical imaging system according to the tenth embodiment.

[0258] According to the tenth embodiment, the optical imaging system 1000 can include a first lens 1010, a second lens 1020, a third lens 1030, a fourth lens 1040, and a fifth lens 1050 disposed in this order from an object side, and can further include an infrared cut filter F and an image sensor IP disposed on an image side of the fifth lens 1050.

[0259] Further, although not illustrated in the drawings, a diaphragm can be disposed between the object side surface and the image side surface of the first lens 1010, and a spacer can be disposed between the second lens 1020 and the third lens 1030.

[0260] The first lens 1010 can have a positive refractive power. The focal length of the first lens 1010 can be 2.0 mm or more. The object side surface of the first lens 1010 can be convex in a paraxial region, and the image side surface of the first lens 1010 can be concave in the paraxial region. The first lens 1010 can be formed of a plastic material. The Abbe number of the first lens 1010 can be 50 or more. The first lens 1010 can be configured as an aspherical lens. For example, the object side surface and the image side surface of the first lens 1010 can be aspherical.

[0261] The second lens 1020 can have a negative refractive power. The focal length of the second lens 1020 can be -6.0 mm or less. The object side surface of the second lens 1020 can be convex in a paraxial region, and the image side surface of the second lens 1020 can be concave in the paraxial region. The second lens 1020 can be formed of a plastic material. For example, the second lens 1020 can be formed of a plastic material having optical characteristics (e.g., refractive index and Abbe number) different from those of the first lens 1010. The Abbe number of the second lens 1020 can be less than 20. The second lens 1020 can be configured as an aspherical lens. For example, the object side surface and the image side surface of the second lens 1020 can be aspherical.

[0262] The third lens 1030 can have a positive refractive power. The focal length of the third lens 1030 can be 18.0 mm or more. The object side surface of the third lens 1030 can be convex in the paraxial region, and the image side surface of the third lens 1030 can be concave in the paraxial region. The third lens 1030 can be formed of a plastic material. For example, the third lens 1030 can be formed of a plastic material having the same optical characteristics (e.g., refractive index and Abbe number) as the optical characteristics of the second lens 1020. The Abbe number of the third lens 1030 can be less than 20. The third lens 1030 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the third lens 1030 can be aspheric.

[0263] The fourth lens 1040 can have a positive refractive power. The focal length of the fourth lens 1040 can be 10.0 mm or more. The object side surface of the fourth lens 1040 can be concave in the paraxial region, and the image side surface of the fourth lens 1040 can be convex in the paraxial region. The fourth lens 1040 can be formed of a plastic material. For example, the fourth lens 1040 can be formed of a plastic material having different optical characteristics (e.g., refractive index and Abbe number) from the optical characteristics of the third lens 1030. The Abbe number of the fourth lens 1040 can be 10 or more and can be less than the Abbe number of the first lens 1010. The fourth lens 1040 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the fourth lens 1040 can be aspheric.

[0264] The fifth lens 1050 can have a negative refractive power. The focal length of the fifth lens 1050 can be less than -1.0 mm. The object side surface of the fifth lens 1050 can be convex, and the image side surface of the fifth lens 1050 can be concave. The fifth lens 1050 can be formed of a plastic material. For example, the fifth lens 1050 can be formed of a plastic material having different optical characteristics (e.g., refractive index and Abbe number) from the optical characteristics of the fourth lens 1040. The Abbe number of the fifth lens 1050 can be 50 or more. The fifth lens 1050 can be configured as an aspheric lens. For example, the object side surface and the image side surface of the fifth lens 1050 can be aspheric.

[0265] The focal length of the optical imaging system 1000 according to the tenth embodiment can be 2.929 mm, the Fno can be 2.297, the FOV can be 85.100°, and the TTL can be 3.110 mm.

[0266] Table 19 below lists the optical and physical parameters of the optical imaging system 1000 according to the tenth embodiment.

[0267] [Table 19]

[0268] Face No. Radius of Curvature Thickness / Distance Refractive Index Abbe Number Focal Length Effective Radius Object Infinity Infinity 1 Infinity -0.265 2 0.900 0.398 1.544 56.00 2.311 0.645 3 2.648 0.068 0.594 4 15.741 0.163 1.671 19.40 -6.443 0.573 5 3.408 0.094 0.506 6 Infinity 0.090 7 12.009 0.173 1.671 19.40 29.563 0.603 8 29.724 0.435 0.722 9 -45.055 0.223 1.567 37.40 45.903 1.032 10 -16.596 0.223 1.238 11 1.415 0.392 1.535 55.70 -6.660 1.833 12 0.916 0.147 1.965 13 Infinity 0.110 1.517 64.20 14 Infinity 0.593 Image Plane Infinity

[0269] Table 20 below lists aspherical surface data of the optical imaging system 1000 according to the tenth embodiment.

[0270] [Table 20]

[0271]

[0272]

[0273] Table 21 below lists values of optical and physical parameters related to conditional expressions of the optical imaging system according to the embodiments.

[0274] [Table 21]

[0275]

[0276]

[0277] According to the foregoing embodiments, the optical imaging system can be slim.

[0278] While specific examples have been shown and described, it will be apparent to those of ordinary skill in the art having the benefit of this disclosure that changes in form and detail can be made without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects in each example are to be considered as being applicable to similar features or aspects in other examples. Suitable results can be achieved if the described techniques are performed in a different order, and / or if 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. Therefore, the scope of the disclosure is not limited to the specific embodiments described herein, but only by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are to be construed as being included in the disclosure.

Claims

1. An optical imaging system, characterized in that, include: The first lens, second lens, third lens, fourth lens, and fifth lens are arranged sequentially from the object side. Among them, the condition TTL / (2×IMG HT)≤0.57 is satisfied. Wherein, TTL is the distance along the optical axis from the object side of the first lens to the image plane, and IMG HT is half the diagonal length of the image plane.

2. The optical imaging system according to claim 1, characterized in that, The condition expression -0.1 is satisfied. <f1 / f3<1.0, Where f1 is the focal length of the first lens and f3 is the focal length of the third lens.

3. The optical imaging system according to claim 1, characterized in that, The conditional expression -0.6 is satisfied. <f1 / f2<0, Where f1 is the focal length of the first lens and f2 is the focal length of the second lens.

4. The optical imaging system according to claim 1, characterized in that, The object-side surface of the second lens is concave.

5. The optical imaging system according to claim 1, characterized in that, The condition expression 0 is satisfied <v1-v4<45, Wherein, v1 is the Abbe number of the first lens, and v4 is the Abbe number of the fourth lens.

6. The optical imaging system according to claim 1, characterized in that, The condition expression 70° is satisfied <FOV×(2×IMG HT) / f, Wherein, FOV is the field of view of the optical imaging system, and f is the focal length of the optical imaging system.

7. The optical imaging system according to claim 1, characterized in that, The object-side surface of the fourth lens is convex.

8. The optical imaging system according to claim 1, characterized in that, The image-side surface of the third lens is convex.

9. The optical imaging system according to claim 1, characterized in that, The conditional expression Fno×{TTL / (2×IMG HT)}≤1.4 is satisfied. Wherein, Fno is the F-number of the optical imaging system.

10. An optical imaging system, characterized in that, include: The first lens has positive refractive power; The second lens has negative refractive power; The third lens has refractive power; The fourth lens has refractive power; as well as The fifth lens has negative refractive power. The first lens to the fifth lens are arranged sequentially from the object side. Among them, the conditional expression -0.1 is satisfied. <f1 / f3<1.0, Where f1 is the focal length of the first lens and f3 is the focal length of the third lens.

11. The optical imaging system according to claim 10, characterized in that, The image-side surface of the first lens is concave, and Among them, the conditional expression 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, and f is the focal length of the optical imaging system.

12. The optical imaging system according to claim 10, characterized in that, The object-side surface of the second lens is concave.

13. The optical imaging system according to claim 10, characterized in that, The condition 80° ≤ FOV must be satisfied. Wherein, FOV is the field of view of the optical imaging system.

14. The optical imaging system according to claim 10, characterized in that, The condition TTL / (2×IMGHT) ≤ 0.57 is satisfied. Wherein, TTL is the distance from the object side of the first lens to the image plane on the optical axis, and IMG HT is half the diagonal length of the image plane.

15. The optical imaging system according to claim 10, characterized in that, The third lens has negative refractive power and a concave object-side surface.

16. The optical imaging system according to claim 10, characterized in that, The conditional expression 3 < |f4 / f| is satisfied. Where f4 is the focal length of the fourth lens, and f is the focal length of the optical imaging system.

Images