Optical image capturing system

Abstract

The optical image capturing system includes, in order from an object side, a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a negative refractive power, a fifth lens having a positive refractive power, and a sixth lens having a negative refractive power, the first lens and the second lens or the third lens and the fourth lens are arranged to be a bonding lens.

Description

[0001] Cross-references to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0072321, filed on June 3, 2024, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. Technical Field

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

[0004] The camera can be mounted on a mobile device.

[0005] For example, a high-resolution image sensor can be used in a camera for a mobile device, and an optical imaging system can be used accordingly.

[0006] Typically, as the size of an image sensor increases, the total optical length of an optical imaging system also increases. However, since mobile devices aim for small size, the goal is to develop optical imaging systems that can address the performance degradation caused by miniaturization and achieve high resolution.

[0007] The above information is presented as background information and is intended to aid in understanding this disclosure. No determination or assertion is made as to whether any of the above content can be used as prior art with respect to this disclosure. Summary of the Invention

[0008] The summary portion of this invention is intended to provide a brief overview of the chosen concepts, which will be further described in the detailed description portion below. This summary portion is not intended to identify key or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter.

[0009] In one general aspect, the optical imaging system includes a first lens having positive refractive power, a second lens having negative refractive power, a third lens having positive refractive power, a fourth lens having negative refractive power, a fifth lens having positive refractive power, and a sixth lens having negative refractive power, arranged sequentially from the object side, wherein the first lens and the second lens or the third lens and the fourth lens are configured as cemented lenses.

[0010] A cemented lens may include a first lens and a second lens, and the object side of the second lens may be convex in the paraxial region.

[0011] Cemented lenses may include a third lens and a fourth lens, and the object side of the fourth lens may be concave in the paraxial region.

[0012] The cemented lens can satisfy the following conditional expression: 0 ≤ |fa / Va - fb / Vb| < 2, where fa and Va are a focal length and an Abbe number of a lens disposed on an object side in the cemented lens, and fb and Vb are a focal length and an Abbe number of a lens disposed on an image side in the cemented lens.

[0013] An object side surface of the fifth lens can be concave in a paraxial region.

[0014] An image side surface of the second lens can be concave in a paraxial region.

[0015] An image side surface of the sixth lens can be concave in a paraxial region.

[0016] The optical imaging system can satisfy the following conditional expression: 1.0 < TTL / f < 1.3, where TTL is a distance from an object side surface of the first lens to an image plane along an optical axis, and f is a total focal length of the optical imaging system.

[0017] The first lens through the sixth lens can be formed of a plastic material.

[0018] In another general aspect, an optical imaging system includes, in order from an object side, a first lens, a second lens, a third lens having a positive refractive power, a fourth lens having a negative refractive power and a convex object side surface, a fifth lens having a positive refractive power, and a sixth lens having a negative refractive power, wherein the optical imaging system satisfies the following conditional expression: 0.5 < TTL / (2 x IMG HT) < 0.8, 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.

[0019] The optical imaging system can satisfy the following conditional expression: -5 < f4 / f < 0, where f4 is a focal length of the fourth lens, and f is a total focal length of the optical imaging system.

[0020] The optical imaging system can satisfy the following conditional expression: -2 < f6 / f < 0, where f6 is a focal length of the sixth lens, and f is a total focal length of the optical imaging system.

[0021] The optical imaging system can satisfy the following conditional expression: 1 < f3 / f < 8, where f3 is a focal length of the third lens, and f is a total focal length of the optical imaging system.

[0022] The first lens and the second lens can be disposed as a cemented lens, wherein an image side surface of the first lens can be concave in a paraxial region.

[0023] The third lens and the fourth lens can be disposed as a cemented lens, wherein an image side surface of the third lens can be convex in a paraxial region.

[0024] The image-side surface of the second lens can be concave in the paraxial region, and the image-side surface of the fifth lens can be convex in the paraxial region.

[0025] Other features and aspects will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the application. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1A is a configuration diagram illustrating an optical imaging system according to a first embodiment of the present disclosure.

[0027] Figure 1B is a configuration diagram illustrating Figure 1A is a graph illustrating an aberration characteristic of the optical imaging system illustrated in

[0028] Figure 2A is a configuration diagram illustrating an optical imaging system according to a second embodiment of the present disclosure.

[0029] Figure 2B is a configuration diagram illustrating Figure 2A is a graph illustrating an aberration characteristic of the optical imaging system illustrated in

[0030] Figure 3A is a configuration diagram illustrating an optical imaging system according to a third embodiment of the present disclosure.

[0031] Figure 3B is a configuration diagram illustrating Figure 3A is a graph illustrating an aberration characteristic of the optical imaging system illustrated in

[0032] Figure 4A is a configuration diagram illustrating an optical imaging system according to a fourth embodiment of the present disclosure.

[0033] Figure 4B is a configuration diagram illustrating Figure 4A is a graph illustrating an aberration characteristic of the optical imaging system illustrated in

[0034] Figure 5A is a configuration diagram illustrating an optical imaging system according to a fifth embodiment of the present disclosure.

[0035] Figure 5B is a configuration diagram illustrating Figure 5A is a graph illustrating an aberration characteristic of the optical imaging system illustrated in

[0036] Figure 6A is a configuration diagram illustrating an optical imaging system according to a sixth embodiment of the present disclosure.

[0037] Figure 6B is a configuration diagram illustrating Figure 6A is a graph illustrating an aberration characteristic of the optical imaging system illustrated in

[0038] Figure 7Ais a configuration diagram illustrating an optical imaging system according to a seventh embodiment of the present disclosure.

[0039] Figure 7B is a configuration diagram illustrating Figure 7A is a graph illustrating an aberration characteristic of the optical imaging system illustrated in

[0040] Figure 8A is a configuration diagram illustrating an optical imaging system according to an eighth embodiment of the present disclosure.

[0041] Figure 8B is a configuration diagram illustrating Figure 8A is a graph illustrating an aberration characteristic of the optical imaging system illustrated in

[0042] Throughout the drawings and detailed description, unless otherwise described, like reference characters refer to like elements. The drawings can not be to scale, and the relative dimensions, proportions, and depiction of elements in the drawings can be exaggerated for purpose of clarity, illustration, and convenience. DETAILED DESCRIPTION

[0043] Hereinafter, while examples of the present disclosure will be described in detail with reference to the accompanying drawings, it should be noted that the examples are not limited thereto.

[0044] The following detailed description is provided to help the reader obtain a thorough understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents thereof will become apparent to those skilled in the art after an understanding of 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, except for operations that must occur in a specific order, and can be changed, which will be apparent after an understanding of the present disclosure. Also, descriptions of features that are well known in the art can be omitted for the sake of clarity and conciseness.

[0045] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, these examples are provided so that this disclosure will be thorough and complete, and fully convey the concept of implementing the methods, devices, and / or systems described herein to those skilled in the art after an understanding of the present disclosure. The examples described herein are to be considered in a descriptive sense only and not intended to limit the scope of the present disclosure.

[0046] Throughout this specification, where an element such as a layer, region, or substrate is described as being "on" or "connected to" another element, it can be directly on or connected to the other element, or intervening elements can be present. In contrast, where an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. It will be understood that when an element described herein is a means plus function, e.g., "a means for" or "a step for," the element can be embodied in many alternative forms including, for example, a circuit, a

[0047] 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; similarly, "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.

[0048] Although terminology can be used in this document, such as "first," "second," and "third," names of components, members, regions, layers, or parts, the components, members, regions, layers, or parts are not limited by the terminology. Rather, the terminology is used only for the purpose of distinguishing one component, member, region, layer, or part from another component, member, region, layer, or part. Therefore, the first component, first member, first region, first layer, or first part mentioned in the examples described herein can also be called the second component, second member, second region, second layer, or second part without departing from the teachings of the examples described herein.

[0049] Spatially relative terms such as "on", "above", "under", "below", and the like can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms can be intended to encompass 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 turned over, elements described as "above" or "on" other elements or features would then be oriented "below" or "on" the other elements or features. Thus, the term "above" encompasses both an orientation of above and below. The device can be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0050] 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 singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has", "having" as used herein, specify the presence of stated features, numbers, operations, members, elements, and / or groups thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, members, elements, and / or groups thereof.

[0051] The shapes shown in the drawings can vary due to manufacturing techniques and / or tolerances. Thus, the examples described herein are not limited to the specific shapes shown in the drawings, but include variations of the shapes that occur during manufacturing.

[0052] It should be noted that, in this document, the word "comprise", or variations such as "comprises" or "comprising", will be understood to mean the inclusion of a stated feature, integer or step, but not the exclusion of one or more other features, integers or steps. It is also noted that, in this document, the word "may" is used in its permissive sense (i.e. meaning having the potential to), rather than in its mandatory sense (i.e. meaning must).

[0053] Features of the examples described herein can be combined in a variety of ways as will be apparent after the disclosure is understood. Also, although the examples described herein have a variety of configurations, other configurations are possible in light of the disclosure.

[0054] One aspect of the disclosure can provide an optical imaging system having a small size in which a high-resolution image can be obtained.

[0055] In an embodiment, the first lens can denote a lens closest to the object side, and the sixth lens can denote a lens closest to the image sensor side (or image side).

[0056] Also, in each lens, the first surface can denote a surface closest to the object side (or object side surface), and the second surface can denote a surface closest to the image sensor side (or image side surface).

[0057] In the description related to the shape of the lens of the embodiment, a convex surface can denote that a paraxial region portion of the surface can be convex, and a concave surface can denote that a paraxial region portion of the surface can be concave. The paraxial region of the lens surface is a central portion of the lens surface surrounding and including an 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 approximations of sinθ ≈ θ, tanθ ≈ θ, and cosθ ≈ 1 are valid. Thus, even when one surface of the lens is described as having a convex shape, an edge portion of the surface can be concave. Similarly, even when one surface of the lens is described as having a concave shape, an edge portion of the surface can be convex.

[0058] In an embodiment, units of parameters related to length, including a radius of curvature, a thickness, a distance, and a focal length of the lenses, can be millimeters (mm), and units of a field of view (FOV) can be degrees (°).

[0059] An optical imaging system according to an embodiment can include six lenses. For example, the optical imaging system can include, disposed in order from an object side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens.

[0060] However, an optical imaging system according to an embodiment can not include only six lenses.

[0061] For example, the optical imaging system can further include an image sensor configured to convert an image of an incident object into an electrical signal.

[0062] Further, for example, the optical imaging system can further include an infrared blocking filter (hereinafter referred to as a "filter") configured to block infrared light among light incident to the image sensor. For example, the filter can be disposed between the sixth lens and the image sensor.

[0063] Further, for example, the optical imaging system can further include a diaphragm configured to adjust an amount of light.

[0064] An optical imaging system according to an embodiment can include cemented lenses. For example, two lenses disposed adjacent to each other among the first lens to the sixth lens can be disposed as cemented lenses.

[0065] Specifically, the cemented lenses can be disposed in a form in which an image side surface of a lens disposed closer to the object side and an object side surface of a lens disposed closer to the image side among the two lenses disposed adjacent to each other are joined to each other. In this case, the two surfaces joined to each other can be the same aspherical surfaces or the same spherical surfaces.

[0066] According to an embodiment, the two lenses disposed adjacent to each other and disposed as the cemented lenses can be joined by an adhesive. For example, an adhesive satisfying predetermined conditions of a refractive index and an Abbe number can be used for lens joining, and the adhesive can be applied between the two lenses disposed adjacent to each other at a thickness of about 1 to 50 µm (micrometers).

[0067] According to an embodiment, powers of the two lenses disposed adjacent to each other and disposed as the cemented lenses can be opposite to each other. For example, among the two lenses disposed as the cemented lenses, the lens disposed closer to the object side can have a positive power or a negative power, and the lens disposed closer to the image side can have a negative power or a positive power.

[0068] The optical imaging system according to the embodiment can include lenses formed of a plastic material. For example, the first to sixth lenses included in the optical imaging system can all be formed of a plastic material.

[0069] Further, each lens can have optical characteristics different from those of an adjacently disposed lens. For example, adjacently disposed lenses can have different refractive indices and Abbe numbers.

[0070] The optical imaging system according to the embodiment can include an aspherical surface lens. That is, at least one surface of at least one of the first to sixth lenses included in the optical imaging system can be an aspherical surface. For example, at least one surface of each of the first to sixth lenses can be an aspherical surface.

[0071] Here, the aspherical surface can be expressed as Equation 1 below.

[0072] Equation 1:

[0073]

[0074] In Equation 1, c is a curvature of the lens (an inverse of a radius of curvature), K is a conic constant, Y is a distance from an arbitrary point on the aspherical surface of the lens to an optical axis, A H, J, and L to P are aspherical constants, and Z (or SAG) can be a distance from the arbitrary point on the aspherical surface of the lens to a vertex of the aspherical surface in the direction of the optical axis.

[0075] The optical imaging system according to the embodiment can satisfy the following conditional expressions.

[0076] Conditional Expression 1: 0 ≤ |fa / Va-fb / Vb| < 2

[0077] Conditional Expression 2: 10 < Vc < 80

[0078] Conditional Expression 3: Nb < Nc < Na

[0079] In Conditional Expression 1, fa, Va, and Na can be a focal length, an Abbe number, and a refractive index of a lens disposed on an object side among two lenses that are bonded to each other, respectively, and fb, Vb, and Nb can be a focal length, an Abbe number, and a refractive index of a lens disposed on an image side among the two lenses that are bonded to each other, respectively. Further, in Conditional Expression 2 and Conditional Expression 3, Vc can be an Abbe number of an adhesive, and Nc can be a refractive index of the adhesive.

[0080] The conditional expression 1 to the conditional expression 3 are related to the optical property conditions of the adhesive used in the cemented lens and the lens bonded for chromatic aberration correction. Specifically, the conditional expression 1 can be a condition expression related to the chromatic aberration elimination of the optical imaging system, and when the conditional expression range is satisfied, chromatic aberration can be less likely to occur.

[0081] In addition, the optical imaging system according to the embodiments can satisfy at least one of the following conditional expressions.

[0082] Conditional expression 4: 0.5 < f1 / f < 2

[0083] Conditional expression 5: -3 < f2 / f < -1

[0084] Conditional expression 6: 1 < f3 / f < 8

[0085] Conditional expression 7: -5 < f4 / f < -1

[0086] Conditional expression 8: 0 < f5 / f < 2

[0087] Conditional expression 9: -2 < f6 / f < 0

[0088] Conditional expression 10: 1.0 < TTL / f < 1.3

[0089] Conditional expression 11: 0 < BFL / f < 0.3

[0090] Conditional expression 12: 0.5 < TTL / (2 x IMG HT) < 0.8

[0091] Conditional expression 13: 1 < f / EPD < 3

[0092] In the conditional expression 4 to the conditional expression 13, 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, TTL is the distance from the object side surface of the first lens to the image plane on the optical axis, BFL is the distance from the image side surface of the sixth lens to the image plane on the optical axis, 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 EPD is the diameter of the entrance pupil.

[0093] The conditional expression 4 to the conditional expression 9 can be the ratio of the focal length of each lens to the total focal length of the optical imaging system, and can be related to the appropriate refractive power of each lens for aberration correction. In addition, the conditional expression 10 to the conditional expression 12 are related to the miniaturization of the optical imaging system, and the conditional expression 13 is related to the brightness performance of the optical imaging system.

[0094] First embodiment

[0095] Figure 1A is a configuration diagram illustrating an optical imaging system according to a first embodiment. Figure 1B is a configuration diagram illustrating Figure 1A is a graph illustrating an aberration characteristic of the optical imaging system illustrated in

[0096] The optical imaging system 100 according to the first embodiment can include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, and a sixth lens 160. A stop can be disposed between the second lens 120 and the third lens 130.

[0097] Further, the optical imaging system 100 can include a filter F and an imaging plane IP disposed on an image side of the sixth lens 160. The imaging plane IP can be a portion of an image sensor in which light is received.

[0098] The total focal length of the optical imaging system 100 according to the first embodiment can be 6.13 mm, the IMG HT can be 6.00 mm, and the FOV can be 85.90 degrees (°).

[0099] The characteristics of each lens of the optical imaging system 100 according to the first embodiment can be as illustrated in Table 1 below.

[0100] Table 1

[0101]

[0102]

[0103] According to the first embodiment, the first lens 110 can have a positive refractive power, a first surface (object side surface) of the first lens 110 can be convex in a paraxial region, and a second surface (image side surface) of the first lens 110 can be concave in the paraxial region.

[0104] The second lens 120 can have a negative refractive power, a first surface (object side surface) of the second lens 120 can be convex in a paraxial region, and a second surface (image side surface) of the second lens 120 can be concave in the paraxial region.

[0105] The third lens 130 can have a positive refractive power, and a first surface (object side surface) of the third lens 130 can be convex in a paraxial region, and a second surface (image side surface) of the third lens 130 can be concave in the paraxial region.

[0106] The fourth lens 140 can have a negative refractive power, and a first surface (object side surface) of the fourth lens 140 can be convex in a paraxial region, and a second surface (image side surface) of the fourth lens 140 can be concave in the paraxial region.

[0107] The fifth lens 150 can have a positive refractive power, and a first surface (object side surface) of the fifth lens 150 can be concave in a paraxial region, and a second surface (image side surface) of the fifth lens 150 can be convex in the paraxial region.

[0108] The sixth lens 160 can have a negative refractive power, and both a first surface (object side surface) of the sixth lens 160 and a second surface (image side surface) of the sixth lens 160 can be concave in a paraxial region.

[0109] According to the first embodiment, the first lens 110 and the second lens 120 can be configured as cemented lenses.

[0110] For example, the second surface (image side surface) of the first lens 110 and the first surface (object side surface) of the second lens 120 which is bonded to the second surface (image side surface) of the first lens 110 can be spherical surfaces.

[0111] According to the first embodiment, at least one surface of each of the first lens 110 to the sixth lens 160 can be an aspherical surface.

[0112] The aspherical constant of each lens of the optical imaging system 100 according to the first embodiment can be as shown in Table 2 below.

[0113] Table 2

[0114] S1 S2 S3 S4 S5 S6 K 0.026 0.000 0.000 -44.813 -61.018 -6.566 A -5.330E-03 0.00E+00 0.00E+00 3.738E-02 -8.885E-02 -8.900E-02 B 2.257E-02 0.00E+00 0.00E+00 8.701E-02 5.905E-01 4.046E-01 C -4.225E-02 0.00E+00 0.00E+00 -6.245E-01 -2.902E+00 -1.797E+00 D 2.355E-02 0.00E+00 0.00E+00 2.121E+00 9.288E+00 5.451E+00 E 6.709E-02 0.00E+00 0.00E+00 -4.467E+00 -2.056E+01 -1.157E+01 F -1.718E-01 0.00E+00 0.00E+00 5.838E+00 3.251E+01 1.752E+01 G 1.963E-01 0.00E+00 0.00E+00 -3.812E+00 -3.756E+01 -1.917E+01 H -1.362E-01 0.00E+00 0.00E+00 -1.237E+00 3.202E+01 1.528E+01 J 6.172E-02 0.00E+00 0.00E+00 5.445E+00 -2.013E+01 -8.855E+00 L -1.861E-02 0.00E+00 0.00E+00 -5.822E+00 9.212E+00 3.685E+00 M 3.681E-06 0.00E+00 0.00E+00 3.491E+00 -2.988E+00 -1.072E+00 N -4.548E-04 0.00E+00 0.00E+00 -1.257E+00 6.512E-01 2.065E-01 O 3.141E-05 0.00E+00 0.00E+00 2.542E-01 -8.562E-02 -2.368E-02 P -9.052E-07 0.00E+00 0.00E+00 -2.227E-02 5.139E-03 1.221E-03 S7 S8 S9 S10 S11 S12 K -31.915 5.109 41.128 -6.151 10.490 -7.075 A -6.283E-02 -5.695E-02 2.752E-02 -9.141E-03 -6.346E-02 -3.429E-02 B -1.027E-01 -6.729E-02 -1.058E-01 -6.259E-02 4.563E-02 1.159E-02 C 4.323E-01 1.819E-01 1.822E-01 1.111E-01 -4.728E-02 -6.562E-03 D -1.009E+00 -2.752E-01 -2.196E-01 -1.117E-01 2.973E-02 2.923E-03 E 1.562E+00 2.797E-01 1.788E-01 7.152E-02 -1.124E-02 -8.426E-04 F -1.663E+00 -1.939E-01 -9.966E-02 -3.073E-02 2.771E-03 1.627E-04 G 1.241E+00 9.114E-02 3.900E-02 9.224E-03 -4.688E-04 -2.191E-05 H -6.549E-01 -2.801E-02 -1.089E-02 -1.981E-03 5.594E-05 2.103E-06 J 2.435E-01 4.971E-03 2.178E-03 3.070E-04 -4.761E-06 -1.448E-07 L -6.270E-02 -2.139E-04 -3.092E-04 -3.410E-05 2.878E-07 7.091E-09 M 1.078E-02 -1.140E-04 3.038E-05 2.651E-06 -1.208E-08 -2.413E-10 N -1.156E-03 2.758E-05 -1.963E-06 -1.369E-07 3.352E-10 5.428E-12 O 6.684E-05 -2.688E-06 7.494E-08 4.223E-09 -5.529E-12 -7.263E-14 P -1.435E-06 1.020E-07 -1.281E-09 -5.882E-11 4.109E-14 4.388E-16

[0115] Second embodiment

[0116] Figure 2A is a configuration diagram illustrating an optical imaging system according to a second embodiment. Figure 2B is a configuration diagram illustrating Figure 2A is a graph illustrating an aberration characteristic of the optical imaging system shown in FIG. 8.

[0117] The optical imaging system 200 according to the second embodiment can include a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, and a sixth lens 260. A stop can be disposed between the second lens 220 and the third lens 230.

[0118] Further, the optical imaging system 200 can include a filter F disposed on an image side of the sixth lens 260 and an imaging plane IP. The imaging plane IP can be a portion of an image sensor in which light is received.

[0119] The total focal length of the optical imaging system 200 according to the second embodiment can be 6.11 mm, the IMG HT can be 6.00 mm, and the FOV can be 86.80 degrees (°).

[0120] The characteristics of each lens of the optical imaging system 200 according to the second embodiment can be as shown in Table 3 below.

[0121] Table 3

[0122] Face number Label Radius of curvature Thickness / distance Refractive index Abbe number Focal length S1 First lens 2.527 1.045 1.559 58.98 5.66 S2 10.559 0.000 S3 Second lens 10.559 0.344 1.690 22.04 -13.58 S4 4.926 0.584 S5 Third lens 17.010 0.434 1.544 55.99 40.04 S6 75.803 0.465 S7 Fourth lens 12.380 0.367 1.661 20.38 -21.91 S8 6.629 0.459 S9 Fifth lens -28.402 0.919 1.544 55.99 4.22 S10 -2.156 0.763 S11 Sixth lens -14.481 0.490 1.535 55.74 -4.20 S12 2.705 0.329 S13 Filter Infinity 0.246 1.517 64.20 S14 Infinity 1.014 S15 Imaging surface Infinity

[0123] According to the second embodiment, the first lens 210 can have a positive refractive power, the first surface (object side surface) of the first lens 210 can be convex in the paraxial region, and the second surface (image side surface) of the first lens 210 can be concave in the paraxial region.

[0124] The second lens 220 can have a negative refractive power, the first surface (object side surface) of the second lens 220 can be convex in the paraxial region, and the second surface (image side surface) of the second lens 220 can be concave in the paraxial region.

[0125] The third lens 230 can have a positive refractive power, the first surface (object side surface) of the third lens 230 can be convex in the paraxial region, and the second surface (image side surface) of the third lens 230 can be concave in the paraxial region.

[0126] The fourth lens 240 can have a negative refractive power, the first surface (object side surface) of the fourth lens 240 can be convex in the paraxial region, and the second surface (image side surface) of the fourth lens 240 can be concave in the paraxial region.

[0127] The fifth lens 250 can have a positive refractive power, the first surface (object side surface) of the fifth lens 250 can be concave in the paraxial region, and the second surface (image side surface) of the fifth lens 250 can be convex in the paraxial region.

[0128] The sixth lens 260 can have a negative refractive power, and both the first surface (object side surface) of the sixth lens 260 and the second surface (image side surface) of the sixth lens 260 can be concave in the paraxial region.

[0129] According to the second embodiment, the first lens 210 and the second lens 220 can be configured as a cemented lens.

[0130] For example, the second surface (image side surface) of the first lens 210 and the first surface (object side surface) of the second lens 220 which is bonded to the second surface (image side surface) of the first lens 210 can be aspherical surfaces.

[0131] According to the second embodiment, at least one surface of each of the first lens 210 to the sixth lens 260 can be an aspherical surface.

[0132] The aspherical constant of each lens of the optical imaging system 200 according to the second embodiment can be as shown in Table 4 below.

[0133] Table 4

[0134]

[0135]

[0136] Third embodiment

[0137] Figure 3A is a configuration diagram illustrating an optical imaging system according to a third embodiment. Figure 3B is a configuration diagram illustrating Figure 3A is a graph illustrating an aberration characteristic of the optical imaging system illustrated in

[0138] The optical imaging system 300 according to the third embodiment can include a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, and a sixth lens 360. A stop can be disposed on an object side of the first lens 310.

[0139] Further, the optical imaging system 300 can include a filter F and an imaging plane IP disposed on an image side of the sixth lens 360. The imaging plane IP can be a portion of an image sensor in which light is received.

[0140] The total focal length of the optical imaging system 300 according to the third embodiment can be 6.70 mm, the IMG HT can be 6.00 mm, and the FOV can be 81.20 degrees (°).

[0141] The characteristics of each lens of the optical imaging system 300 according to the third embodiment can be as shown in Table 5 below.

[0142] Table 5

[0143]

[0144]

[0145] According to the third embodiment, the first lens 310 can have a positive refractive power, a first surface (object side surface) of the first lens 310 can be convex in a paraxial region, and a second surface (image side surface) of the first lens 310 can be concave in the paraxial region.

[0146] The second lens 320 can have a negative refractive power, a first surface (object side surface) of the second lens 320 can be convex in a paraxial region, and a second surface (image side surface) of the second lens 320 can be concave in the paraxial region.

[0147] The third lens 330 can have a positive refractive power, a first surface (object side surface) of the third lens 330 can be concave in a paraxial region, and a second surface (image side surface) of the third lens 330 can be convex in the paraxial region.

[0148] The fourth lens 340 can have a negative refractive power, a first surface (object side surface) of the fourth lens 340 can be concave in a paraxial region, and a second surface (image side surface) of the fourth lens 340 can be convex in the paraxial region.

[0149] The fifth lens 350 can have a positive refractive power, and both a first surface (object side surface) of the fifth lens 350 and a second surface (image side surface) of the fifth lens 350 can be convex in a paraxial region.

[0150] The sixth lens 360 can have a negative refractive power, a first surface (object side surface) of the sixth lens 360 can be convex in a paraxial region, and a second surface (image side surface) of the sixth lens 360 can be concave in the paraxial region.

[0151] According to the third embodiment, the third lens 330 and the fourth lens 340 can be configured as a cemented lens.

[0152] For example, the second surface (image side surface) of the third lens 330 and the first surface (object side surface) of the fourth lens 340 which is bonded to the second surface (image side surface) of the third lens 330 can be spherical surfaces.

[0153] According to the third embodiment, at least one surface of each of the first lens 310 to the sixth lens 360 can be an aspherical surface.

[0154] The aspherical constant of each lens of the optical imaging system 300 according to the third embodiment can be as shown in Table 6 below.

[0155] Table 6

[0156]

[0157]

[0158] Fourth embodiment

[0159] Figure 4A is a configuration diagram illustrating an optical imaging system according to a fourth embodiment. Figure 4B is a configuration diagram illustratingFigure 4A a graph of aberration characteristics of the optical imaging system shown in FIG. 1.

[0160] An optical imaging system 400 according to a fourth embodiment can include a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, and a sixth lens 460. A stop can be disposed on an object side of the first lens 410.

[0161] In addition, the optical imaging system 400 can include a filter F and an imaging plane IP disposed on an image side of the sixth lens 460. The imaging plane IP can be a portion of an image sensor in which light is received.

[0162] A total focal length of the optical imaging system 400 according to the fourth embodiment can be 6.71 mm, an IMG HT can be 6.00 mm, and a FOV can be 80.90 degrees (°).

[0163] The characteristics of each lens of the optical imaging system 400 according to the fourth embodiment can be as shown in Table 7 below.

[0164] Table 7

[0165]

[0166]

[0167] According to the fourth embodiment, the first lens 410 can have a positive refractive power, a first surface (object side surface) of the first lens 410 can be convex in a paraxial region, and a second surface (image side surface) of the first lens 410 can be concave in the paraxial region.

[0168] The second lens 420 can have a negative refractive power, a first surface (object side surface) of the second lens 420 can be convex in a paraxial region, and a second surface (image side surface) of the second lens 420 can be concave in the paraxial region.

[0169] The third lens 430 can have a positive refractive power, a first surface (object side surface) of the third lens 430 can be concave in a paraxial region, and a second surface (image side surface) of the third lens 430 can be convex in the paraxial region.

[0170] The fourth lens 440 can have a negative refractive power, a first surface (object side surface) of the fourth lens 440 can be concave in a paraxial region, and a second surface (image side surface) of the fourth lens 440 can be convex in the paraxial region.

[0171] The fifth lens 450 can have a negative refractive power, and both the first surface (object side surface) of the fifth lens 450 and the second surface (image side surface) of the fifth lens 450 can be convex in the paraxial region.

[0172] The sixth lens 460 can have a negative refractive power, the first surface (object side surface) of the sixth lens 460 can be convex in the paraxial region, and the second surface (image side surface) of the sixth lens 460 can be concave in the paraxial region.

[0173] According to the fourth embodiment, the third lens 430 and the fourth lens 440 can be configured as a cemented lens.

[0174] For example, the second surface (image side surface) of the third lens 430 and the first surface (object side surface) of the fourth lens 440 which is bonded to the second surface (image side surface) of the third lens 430 can be aspherical surfaces.

[0175] According to the fourth embodiment, at least one surface of each of the first lens 410 to the sixth lens 460 can be an aspherical surface.

[0176] The aspherical constant of each lens of the optical imaging system 400 according to the fourth embodiment can be as shown in Table 8 below.

[0177] Table 8

[0178]

[0179]

[0180] Fifth embodiment

[0181] Figure 5A is a configuration diagram illustrating an optical imaging system according to a fifth embodiment. Figure 5B is a configuration diagram illustrating Figure 5A is a graph illustrating an aberration characteristic of the optical imaging system illustrated in FIG. 11.

[0182] The optical imaging system 500 according to the fifth embodiment can include a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, and a sixth lens 560. A stop can be disposed between the second lens 520 and the third lens 530.

[0183] In addition, the optical imaging system 500 can include a filter F disposed on the image side of the sixth lens 560 and an imaging plane IP. The imaging plane IP can be a portion of an image sensor in which light is received.

[0184] The total focal length of the optical imaging system 500 according to the fifth embodiment can be 6.94 mm, the IMG HT can be 6.00 mm, and the FOV can be 78.90 degrees (°).

[0185] The characteristics of each lens of the optical imaging system 500 according to the fifth embodiment can be as shown in Table 9 below.

[0186] Table 9

[0187] Face number Label Radius of curvature Thickness / distance Refractive index Abbe number Focal length S1 First lens 2.908 1.190 1.566 60.05 6.33 S2 13.002 0.000 S3 Second lens 13.002 0.394 1.710 22.49 -14.36 S4 5.673 0.667 S5 Third lens 18.846 0.490 1.544 55.99 44.77 S6 81.351 0.530 S7 Fourth lens 14.410 0.424 1.661 20.38 -24.79 S8 7.616 0.521 S9 Fifth lens -31.829 1.039 1.544 55.99 4.77 S10 -2.437 0.910 S11 Sixth lens -16.453 0.596 1.535 55.74 -4.62 S12 2.956 0.378 S13 Filter Infinity 0.283 1.517 64.20 S14 Infinity 1.079 S15 Imaging surface Infinity

[0188] According to the fifth embodiment, the first lens 510 can have a positive refractive power, the first surface (object side surface) of the first lens 510 can be convex in the paraxial region, and the second surface (image side surface) of the first lens 510 can be concave in the paraxial region.

[0189] The second lens 520 can have a negative refractive power, the first surface (object side surface) of the second lens 520 can be convex in the paraxial region, and the second surface (image side surface) of the second lens 520 can be concave in the paraxial region.

[0190] The third lens 530 can have a positive refractive power, the first surface (object side surface) of the third lens 530 can be convex in the paraxial region, and the second surface (image side surface) of the third lens 530 can be concave in the paraxial region.

[0191] The fourth lens 540 can have a negative refractive power, the first surface (object side surface) of the fourth lens 540 can be convex in the paraxial region, and the second surface (image side surface) of the fourth lens 540 can be concave in the paraxial region.

[0192] The fifth lens 550 can have a positive refractive power, the first surface (object side surface) of the fifth lens 550 can be concave in the paraxial region, and the second surface (image side surface) of the fifth lens 550 can be convex in the paraxial region.

[0193] The sixth lens 560 can have a negative refractive power, and both the first surface (object side surface) of the sixth lens 560 and the second surface (image side surface) of the sixth lens 560 can be concave in the paraxial region.

[0194] According to the fifth embodiment, the first lens 510 and the second lens 520 can be configured as a cemented lens.

[0195] For example, the second surface (image side surface) of the first lens 510 and the first surface (object side surface) of the second lens 520 which is bonded to the second surface (image side surface) of the first lens 510 can be spherical surfaces.

[0196] According to the fifth embodiment, at least one surface of each of the first lens 510 through the sixth lens 560 can be an aspheric surface.

[0197] The aspheric constant of each lens of the optical imaging system 500 according to the fifth embodiment can be as shown in Table 10 below.

[0198] Table 10

[0199]

[0200]

[0201] Sixth embodiment

[0202] Figure 6A is a configuration diagram illustrating an optical imaging system according to a sixth embodiment. Figure 6B is a configuration diagram illustrating Figure 6A is a graph illustrating an aberration characteristic of the optical imaging system shown in

[0203] The optical imaging system 600 according to the sixth embodiment can include a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, a fifth lens 650, and a sixth lens 660. A stop can be disposed between the second lens 620 and the third lens 630.

[0204] Further, the optical imaging system 600 can include a filter F and an imaging plane IP disposed on an image side of the sixth lens 660. The imaging plane IP can be a portion of an image sensor in which light is received.

[0205] The optical imaging system 600 according to the sixth embodiment can have a total focal length of 6.97 mm, an IMGHT of 6.00 mm, and a FOV of 79.00 degrees (°).

[0206] The characteristics of each lens of the optical imaging system 600 according to the sixth embodiment can be as shown in Table 11 below.

[0207] Table 11

[0208]

[0209]

[0210] According to the sixth embodiment, the first lens 610 can have a positive refractive power, a first surface (object side surface) of the first lens 610 can be convex in a paraxial region, and a second surface (image side surface) of the first lens 610 can be concave in the paraxial region.

[0211] The second lens 620 can have a negative refractive power, a first surface (object side surface) of the second lens 620 can be convex in a paraxial region, and a second surface (image side surface) of the second lens 620 can be concave in the paraxial region.

[0212] The third lens 630 can have a positive refractive power, a first surface (object side surface) of the third lens 630 can be convex in a paraxial region, and a second surface (image side surface) of the third lens 630 can be concave in the paraxial region.

[0213] The fourth lens 640 can have a negative refractive power, a first surface (object side surface) of the fourth lens 640 can be convex in a paraxial region, and a second surface (image side surface) of the fourth lens 640 can be concave in the paraxial region.

[0214] The fifth lens 650 can have a positive refractive power, a first surface (object side surface) of the fifth lens 650 can be concave in a paraxial region, and a second surface (image side surface) of the fifth lens 650 can be convex in the paraxial region.

[0215] The sixth lens 660 can have a negative refractive power, and both a first surface (object side surface) of the sixth lens 660 and a second surface (image side surface) of the sixth lens 660 can be concave in a paraxial region.

[0216] According to the sixth embodiment, the first lens 610 and the second lens 620 can be configured as a cemented lens.

[0217] For example, the second surface (image side surface) of the first lens 610 and the first surface (object side surface) of the second lens 620 which is bonded to the second surface (image side surface) of the first lens 610 can be aspherical surfaces.

[0218] According to the sixth embodiment, at least one surface of each of the first lens 610 to the sixth lens 660 can be an aspherical surface.

[0219] The aspherical constant of each lens of the optical imaging system 600 according to the sixth embodiment can be as shown in Table 12 below.

[0220] Table 12

[0221] S1 S2 S3 S4 S5 S6 K 0.029 1.216 1.216 -44.489 -61.814 81.874 A -2.654E-03 -4.493E-03 -4.493E-03 2.560E-02 -5.799E-02 -6.153E-02 B 1.393E-03 1.119E-01 1.119E-01 1.538E-02 3.280E-01 2.176E-01 C 2.522E-02 -7.797E-01 -7.797E-01 7.526E-03 -1.380E+00 -7.123E-01 D -7.955E-02 2.758E+00 2.758E+00 -5.477E-01 3.758E+00 1.580E+00 E 1.226E-01 -5.922E+00 -5.922E+00 2.450E+00 -6.984E+00 -2.457E+00 F -1.164E-01 8.393E+00 8.393E+00 -5.757E+00 9.138E+00 2.736E+00 G 7.377E-02 -8.217E+00 -8.217E+00 8.594E+00 -8.587E+00 -2.215E+00 H -3.220E-02 5.694E+00 5.694E+00 -8.702E+00 5.858E+00 1.312E+00 J 9.791E-03 -2.817E+00 -2.817E+00 6.130E+00 -2.903E+00 -5.675E-01 L -2.060E-03 9.900E-01 9.900E-01 -3.012E+00 1.034E+00 1.770E-01 M 2.925E-04 -2.416E-01 -2.416E-01 1.013E+00 -2.581E-01 -3.868E-02 N -2.657E-05 3.894E-02 3.894E-02 -2.223E-01 4.286E-02 5.616E-03 O 1.383E-06 -3.733E-03 -3.733E-03 2.871E-02 -4.254E-03 -4.861E-04 P -3.096E-08 1.614E-04 1.614E-04 -1.654E-03 1.912E-04 1.895E-05 S7 S8 S9 S10 S11 S12 K -33.397 5.234 44.438 -6.180 10.456 -6.791 A -4.472E-02 -3.422E-02 2.202E-02 6.726E-03 -5.482E-02 -1.287E-02 B -3.640E-02 -5.672E-02 -6.733E-02 -7.207E-02 3.965E-02 -7.732E-03 C 1.414E-01 1.308E-01 9.237E-02 9.894E-02 -2.816E-02 5.597E-03 D -2.831E-01 -1.709E-01 -8.463E-02 -7.650E-02 1.225E-02 -1.964E-03 E 3.635E-01 1.478E-01 5.153E-02 3.746E-02 -3.332E-03 4.452E-04 F -3.145E-01 -8.817E-02 -2.140E-02 -1.233E-02 6.041E-04 -6.952E-05 G 1.884E-01 3.711E-02 6.232E-03 2.835E-03 -7.609E-05 7.681E-06 H -7.931E-02 -1.114E-02 -1.295E-03 -4.654E-04 6.813E-06 -6.083E-07 J 2.351E-02 2.382E-03 1.929E-04 5.492E-05 -4.372E-07 3.462E-08 L -4.856E-03 -3.579E-04 -2.042E-05 -4.625E-06 1.999E-08 -1.403E-09 M 6.793E-04 3.664E-05 1.499E-06 2.714E-07 -6.361E-10 3.946E-11 N -6.087E-05 -2.407E-06 -7.242E-08 -1.054E-08 1.340E-11 -7.312E-13 O 3.117E-06 9.020E-08 2.071E-09 2.435E-10 -1.680E-13 8.024E-15 P -6.812E-08 -1.429E-09 -2.655E-11 -2.534E-12 9.492E-16 -3.946E-17

[0222] Seventh embodiment

[0223] Figure 7A FIG. 7 is a configuration diagram illustrating an optical imaging system according to a seventh embodiment. Figure 7B FIG. 7 is a configuration diagram illustrating an optical imaging system according to a seventh embodiment. Figure 7A FIG. 8 is a graph illustrating an aberration characteristic of the optical imaging system illustrated in FIG. 7.

[0224] The optical imaging system 700 according to the seventh embodiment can include a first lens 710, a second lens 720, a third lens 730, a fourth lens 740, a fifth lens 750, and a sixth lens 760. A stop can be disposed on an object side of the first lens 710.

[0225] Further, the optical imaging system 700 can include a filter F and an imaging plane IP disposed on an image side of the sixth lens 760. The imaging plane IP can be a portion of an image sensor in which light is received.

[0226] The total focal length of the optical imaging system 700 according to the seventh embodiment can be 7.59 mm, the IMG HT can be 6.00 mm, and the FOV can be 74.20 degrees (°).

[0227] The characteristics of each lens of the optical imaging system 700 according to the seventh embodiment can be as shown in Table 13 below.

[0228] Table 13

[0229] Face number Label Radius of curvature Thickness / distance Refractive index Abbe number Focal length S1 First lens 3.327 1.362 1.561 59.50 6.49 S2 31.366 0.307 S3 Second lens 137.398 0.627 1.710 22.61 -14.33 S4 9.549 0.868 S5 Third lens -28.828 0.589 1.570 56.91 10.17 S6 -4.878 0.000 S7 Fourth lens -4.878 0.352 1.700 30.41 -9.57 S8 -18.164 0.768 S9 Fifth lens 20.603 0.963 1.567 37.40 7.56 S10 -5.364 1.389 S11 Sixth lens 12.620 0.580 1.535 55.74 -5.87 S12 2.482 0.935 S13 Filter Infinity 0.260 1.517 64.17 S14 Infinity 0.260 S15 Imaging surface Infinity

[0230] According to the seventh embodiment, the first lens 710 can have a positive refractive power, the first surface (object side surface) of the first lens 710 can be convex in the paraxial region, and the second surface (image side surface) of the first lens 710 can be concave in the paraxial region.

[0231] The second lens 720 can have a negative refractive power, the first surface (object side surface) of the second lens 720 can be convex in the paraxial region, and the second surface (image side surface) of the second lens 720 can be concave in the paraxial region.

[0232] The third lens 730 can have a positive refractive power, the first surface (object side surface) of the third lens 730 can be concave in the paraxial region, and the second surface (image side surface) of the third lens 730 can be convex in the paraxial region.

[0233] The fourth lens 740 can have a negative refractive power, the first surface (object side surface) of the fourth lens 740 can be concave in the paraxial region, and the second surface (image side surface) of the fourth lens 740 can be convex in the paraxial region.

[0234] The fifth lens 750 can have a positive refractive power, and both the first surface (object side surface) of the fifth lens 750 and the second surface (image side surface) of the fifth lens 750 can be convex in the paraxial region.

[0235] The sixth lens 760 can have a negative refractive power, a first surface (object side surface) of the sixth lens 760 can be convex in a paraxial region, and a second surface (image side surface) of the sixth lens 760 can be concave in the paraxial region.

[0236] According to the seventh embodiment, the third lens 730 and the fourth lens 740 can be configured as cemented lenses.

[0237] For example, the second surface (image side surface) of the third lens 730 and the first surface (object side surface) of the fourth lens 740 which is joined with the second surface (image side surface) of the third lens 730 can be spherical surfaces.

[0238] According to the seventh embodiment, at least one surface of each of the first lens 710 to the sixth lens 760 can be an aspherical surface.

[0239] The aspherical constant of each lens of the optical imaging system 700 according to the seventh embodiment can be as shown in Table 14 below.

[0240] Table 14

[0241]

[0242]

[0243] Eighth embodiment

[0244] Figure 8A is a configuration diagram illustrating an optical imaging system according to an eighth embodiment. Figure 8B is a configuration diagram illustrating Figure 8A is a graph illustrating an aberration characteristic of the optical imaging system illustrated in FIG. 8B.

[0245] The optical imaging system 800 according to the eighth embodiment can include a first lens 810, a second lens 820, a third lens 830, a fourth lens 840, a fifth lens 850, and a sixth lens 860. A stop can be disposed on an object side of the first lens 810.

[0246] Further, the optical imaging system 800 can include a filter F disposed on an image side of the sixth lens 860 and an imaging plane IP. The imaging plane IP can be a portion of an image sensor in which light is received.

[0247] The total focal length of the optical imaging system 800 according to the eighth embodiment can be 7.48 mm, the IMG HT can be 6.00 mm, and the FOV can be 75.00 degrees (°).

[0248] The characteristics of each lens of the optical imaging system 800 according to the eighth embodiment can be as shown in Table 15 below.

[0249] Table 15

[0250] Face number Label Radius of curvature Thickness / distance Refractive index Abbe number Focal length S1 First lens 3.323 1.372 1.570 60.67 6.58 S2 24.190 0.304 S3 Second lens 58.806 0.627 1.710 21.42 -15.81 S4 9.468 0.845 S5 Third lens -20.344 0.548 1.567 61.33 11.99 S6 -5.161 0.000 S7 Fourth lens -5.161 0.362 1.705 29.93 -11.44 S8 -14.539 0.765 S9 Fifth lens 21.996 0.947 1.567 37.40 7.62 S10 -5.332 1.363 S11 Sixth lens 13.460 0.556 1.535 55.74 -5.67 S12 2.447 0.927 S13 Filter Infinity 0.260 1.517 64.17 S14 Infinity 0.227 S15 Imaging surface Infinity

[0251] According to the eighth embodiment, the first lens 810 can have a positive refractive power, the first surface (object side surface) of the first lens 810 can be convex in the paraxial region, and the second surface (image side surface) of the first lens 810 can be concave in the paraxial region.

[0252] The second lens 820 can have a negative refractive power, the first surface (object side surface) of the second lens 820 can be convex in the paraxial region, and the second surface (image side surface) of the second lens 820 can be concave in the paraxial region.

[0253] The third lens 830 can have a positive refractive power, the first surface (object side surface) of the third lens 830 can be concave in the paraxial region, and the second surface (image side surface) of the third lens 830 can be convex in the paraxial region.

[0254] The fourth lens 840 can have a negative refractive power, the first surface (object side surface) of the fourth lens 840 can be concave in the paraxial region, and the second surface (image side surface) of the fourth lens 840 can be convex in the paraxial region.

[0255] The fifth lens 850 can have a positive refractive power, and both the first surface (object side surface) of the fifth lens 850 and the second surface (image side surface) of the fifth lens 850 can be convex in the paraxial region.

[0256] The sixth lens 860 can have a negative refractive power, the first surface (object side surface) of the sixth lens 860 can be convex in the paraxial region, and the second surface (image side surface) of the sixth lens 860 can be concave in the paraxial region.

[0257] According to the eighth embodiment, the third lens 830 and the fourth lens 840 can be configured as a cemented lens.

[0258] For example, the second surface (image side surface) of the third lens 830 and the first surface (object side surface) of the fourth lens 840 which is joined with the second surface (image side surface) of the third lens 830 can be aspherical surfaces.

[0259] According to the eighth embodiment, at least one surface of each of the first lens 810 to the sixth lens 860 can be an aspherical surface.

[0260] The aspherical constant of each lens of the optical imaging system 800 according to the eighth embodiment can be as shown in Table 16 below.

[0261] Table 16

[0262]

[0263]

[0264] The conditional expression data according to the embodiments are shown in Table 17 below.

[0265] Table 17

[0266] Conditional expression Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 |fa / Va-fb / Vb| 0.721 0.712 0.607 0.564 f1 / f 0.927 0.926 0.894 0.891 f2 / f -2.240 -2.223 -2.149 -2.198 f3 / f 6.458 6.553 1.857 1.733 f4 / f -3.560 -3.586 -1.776 -1.683 f5 / f 0.688 0.691 1.015 1.031 f6 / f -0.677 -0.687 -0.779 -0.745 TTL / f 1.217 1.221 1.223 1.221 BFL / f 0.262 0.260 0.196 0.184 TTL / (2xIMG HT) 0.622 0.622 0.683 0.683 f / EPD 1.969 1.893 2.269 2.271 Conditional expression Embodiment 5 Embodiment 6 Embodiment 7 Embodiment 8 |fa / Va-fb / Vb| 0.744 0.691 0.493 0.578 f1 / f 0.912 0.908 0.855 0.880 f2 / f -2.069 -2.121 -1.888 -2.114 f3 / f 6.451 6.519 1.340 1.603 f4 / f -3.572 -3.521 -1.261 -1.529 f5 / f 0.687 0.693 0.996 1.019 f6 / f -0.666 -0.676 -0.773 -0.758 TTL / f 1.225 1.224 1.220 1.217 BFL / f 0.251 0.249 0.192 0.189 TTL / (2xIMG HT) 0.708 0.711 0.772 0.759 f / EPD 1.969 1.892 2.290 2.270

[0267] According to the above-described embodiments, the optical imaging system can image a high-resolution image by reducing the total optical length and improving chromatic aberration.

[0268] While specific examples have been shown and described, it will be understood that various changes in form and details can be made without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be understood as descriptive only and not limiting. The description of features or aspects within each example should be considered as applicable to similar features or aspects within other examples. Proper results can still be achieved if the described techniques are performed in a different order, and / or if the systems, architectures, devices or circuitry described are combined or substituted with other components or their equivalents, or if other components are used instead of, or in addition to, the described systems, architectures, devices or circuitry. Thus, the scope of the disclosure is not limited by the specific embodiments described, 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, including: The following lenses are arranged sequentially from the object side: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with negative refractive power, a fifth lens with positive refractive power, and a sixth lens with negative refractive power. Wherein, the first lens and the second lens, or the third lens and the fourth lens, are configured as cemented lenses, and The optical imaging system has a total of six lenses.

2. The optical imaging system according to claim 1, in, The cemented lens includes the first lens and the second lens, and The object-side surface of the second lens is convex in the paraxial region.

3. The optical imaging system according to claim 1, in, The cemented lens includes the third lens and the fourth lens, and The object-side surface of the fourth lens is concave in the paraxial region.

4. The optical imaging system according to claim 1, in, The cemented lens satisfies the following conditional expression: 0≤|fa / Va-fb / Vb|<2, Wherein, fa and Va are the focal length and Abbe number of the lens disposed on the object side of the cemented lens, respectively, and fb and Vb are the focal length and Abbe number of the lens disposed on the image side of the cemented lens, respectively.

5. The optical imaging system according to claim 1, wherein, The object-side surface of the fifth lens is concave in the paraxial region.

6. The optical imaging system according to claim 1, wherein, The image-side surface of the second lens is concave in the paraxial region.

7. The optical imaging system according to claim 1, wherein, The image-side surface of the sixth lens is concave in the paraxial region.

8. The optical imaging system according to claim 1, wherein, The optical imaging system satisfies the following conditional expression: 1.0 <TTL / f<1.3, Where TTL is the distance along the optical axis from the object side of the first lens to the imaging surface, and f is the total focal length of the optical imaging system.

9. The optical imaging system according to claim 1, wherein, The first lens through the sixth lens are made of plastic material.

10. An optical imaging system, including: The lenses arranged sequentially from the object side are: a first lens, a second lens, a third lens with positive refractive power, a fourth lens with negative refractive power and a convex object-side surface, a fifth lens with positive refractive power, and a sixth lens with negative refractive power. The optical imaging system satisfies the following conditional expression: 0.5 <TTL / (2×IMG HT)<0.8, Where TTL is the distance along the optical axis from the object side of the first lens to the imaging plane, and IMG HT is half the diagonal length of the imaging plane, and The optical imaging system has a total of six lenses.

11. The optical imaging system according to claim 10, wherein, The optical imaging system satisfies the following conditional expression: -5 <f4 / f<0, Where f4 is the focal length of the fourth lens, and f is the total focal length of the optical imaging system.

12. The optical imaging system according to claim 10, wherein, The optical imaging system satisfies the following conditional expression: -2 <f6 / f<0, Where f6 is the focal length of the sixth lens, and f is the total focal length of the optical imaging system.

13. The optical imaging system according to claim 10, wherein, The optical imaging system satisfies the following conditional expression: 1 <f3 / f<8, Where f3 is the focal length of the third lens, and f is the total focal length of the optical imaging system.

14. The optical imaging system according to claim 10, wherein, The first lens and the second lens are configured as cemented lenses, and The image-side surface of the first lens is concave in the paraxial region.

15. The optical imaging system according to claim 10, wherein, The third lens and the fourth lens are configured as cemented lenses, and The image-side surface of the third lens is convex in the paraxial region.

16. The optical imaging system according to claim 10, wherein, The image-side surface of the second lens is concave in the paraxial region, and the image-side surface of the fifth lens is convex in the paraxial region.

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