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-reference 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. Utility Model Content

[0008] This summary portion is provided to briefly introduce the selection of 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] A cemented lens 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 the focal length and Abbe number of the lens disposed on the object side in the cemented lens, and fb and Vb are the focal length and Abbe number of the lens disposed on the image side in the cemented lens.

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

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

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

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

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

[0018] In another general aspect, the optical imaging system includes 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 sequentially disposed from the object side, wherein 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 surface of the first lens to the imaging surface, and IMG HT is half of the diagonal length of the imaging surface.

[0019] The optical imaging system can satisfy 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.

[0020] The optical imaging system can satisfy 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.

[0021] The optical imaging system can satisfy 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.

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

[0023] The third lens and the fourth lens can be set as a cemented lens, wherein the image side surface of the third lens can be convex in the 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 accompanying drawings and the detailed description below. Attached Figure Description

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

[0027] Figure 1B It is shown Figure 1A The graph shows the aberration characteristics of the optical imaging system.

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

[0029] Figure 2B It is shown Figure 2A The graph shows the aberration characteristics of the optical imaging system.

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

[0031] Figure 3B It is shown Figure 3A The graph shows the aberration characteristics of the optical imaging system.

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

[0033] Figure 4B It is shown Figure 4A The graph shows the aberration characteristics of the optical imaging system.

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

[0035] Figure 5B It is shown Figure 5A The graph shows the aberration characteristics of the optical imaging system.

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

[0037] Figure 6B It is shown Figure 6A The graph shows the aberration characteristics of the optical imaging system.

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

[0039] Figure 7B It is shown Figure 7A The graph shows the aberration characteristics of the optical imaging system.

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

[0041] Figure 8B It is shown Figure 8A The graph shows the aberration characteristics of the optical imaging system.

[0042] Throughout the accompanying drawings and detailed embodiments, unless otherwise described, the same reference numerals refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative dimensions, scale, and depiction of elements in the drawings may be exaggerated. Detailed Implementation

[0043] In the following description, although examples of this 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 embodiments are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein, except for operations that must occur in a specific order, as will become apparent upon understanding this disclosure. Furthermore, for clarity and brevity, descriptions of features well-known in the art may be omitted.

[0045] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein are provided merely to illustrate some of the many possible ways in which the methods, apparatuses, and / or systems described herein will become apparent upon understanding this disclosure.

[0046] Throughout this specification, when an element such as a layer, region, or substrate is described as being "on," "connected to," or "attached to" another element, the element may be directly "on," directly "connected to," or directly "attached to" the other element, or there may be one or more other elements between the element and the other element. Conversely, when an element is described as being "directly on," "directly connected to," or "directly attached to" another element, there are no other elements between the element and the other element.

[0047] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more items; similarly, “at least one” includes any one of the associated listed items and any combination of any two or more items.

[0048] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited by these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or section from another. Therefore, without departing from the teachings of the examples described herein, the first component, first part, first region, first layer, or first section mentioned in these examples may also be referred to as a second component, second part, second region, second layer, or second section.

[0049] Spatial relative terms such as “above,” “above,” “below,” and “under” may be used herein for descriptive convenience to describe the relationship of one element relative to another, as shown in the accompanying drawings. In addition to covering the orientation depicted in the drawings, these spatial relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “above” another element would be located “below” or “under” that other element. Thus, depending on the spatial orientation of the device, the term “above” covers both orientations of “above” and “below”. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0050] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the terms “a,” “an,” and “the” are intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0051] Due to manufacturing techniques and / or tolerances, the shapes shown in the accompanying drawings may vary. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include shape variations that occur during manufacturing.

[0052] It should be noted that in this document, the term "may" is used relative to examples, such as regarding what an example may include or implement, meaning that there exists at least one example that includes or implements such a feature, but not all examples are limited to this.

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

[0054] One aspect of this disclosure is to provide a small-sized optical imaging system capable of acquiring high-resolution images.

[0055] In an implementation, the first lens may refer to the lens closest to the object side, and the sixth lens may refer to the lens closest to the image sensor side (or image side).

[0056] Furthermore, in each lens, the first surface may represent the surface closest to the object side (or the object side surface), and the second surface may represent the surface closest to the image sensor side (or the image side surface).

[0057] In the description relating to the shape of the lens in the embodiments, a convex surface can mean that the paraxial region of the surface is convex, and a concave surface can mean that the paraxial region of the surface is concave. The paraxial region of the lens surface is the central portion of the lens surface surrounding and including the optical axis of the lens surface. In the paraxial region of the lens surface, light rays incident on the lens surface form a small angle θ with the optical axis, and approximations such as sinθ≈θ, tanθ≈θ, and cosθ≈1 are valid. Therefore, even when a surface of the lens is described as having a convex shape, the edge portion of that surface can be concave. Similarly, even when a surface of the lens is described as having a concave shape, the edge portion of that surface can be convex.

[0058] In implementation, the units for length-related parameters (including the radius of curvature, thickness, distance, and focal length of the lens) may be millimeters (mm), and the units for field of view (FOV) may be degrees (°).

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

[0060] However, the optical imaging system according to the implementation may include more than six lenses.

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

[0062] Furthermore, for example, the optical imaging system may also include an infrared blocking filter (hereinafter referred to as a "filter") configured to block infrared light from entering the light incident on the image sensor. For example, the filter may be positioned between the sixth lens and the image sensor.

[0063] In addition, for example, an optical imaging system may also include an aperture configured to adjust the amount of light.

[0064] The optical imaging system according to the embodiments may include cemented lenses. For example, two lenses arranged adjacent to each other among the first to sixth lenses may be cemented lenses.

[0065] Specifically, cemented lenses can be arranged in such a way that the image-side surface of the lens positioned closer to the object side and the object-side surface of the lens positioned closer to the image side of two adjacent lenses are joined together. In this case, the two joined surfaces can be either the same aspherical surface or the same spherical surface.

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

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

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

[0069] Furthermore, each lens can have optical properties different from those of adjacent lenses. For example, adjacent lenses can have different refractive indices and Abbe numbers.

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

[0071] Here, an aspherical surface can be represented by the following equation 1.

[0072] Equation 1:

[0073]

[0074] In Equation 1, c is the curvature of the lens (the reciprocal of the radius of curvature), K is the quadratic constant, Y is the distance from any point on the aspherical surface of the lens to the optical axis, AH, J and L to P are aspherical constants, and Z (or SAG) can be the distance from any point on the aspherical surface of the lens to the 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 expression.

[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 the focal length, Abbe number, and refractive index of the lens disposed on the object side of the two joined lenses, respectively; and fb, Vb, and Nb can be the focal length, Abbe number, and refractive index of the lens disposed on the image side of the two joined lenses, respectively. Furthermore, in conditional expressions 2 and 3, Vc can be the Abbe number of the adhesive, and Nc can be the refractive index of the adhesive.

[0080] Conditional expressions 1 through 3 relate to the adhesive used in cemented lenses and the optical properties of the lenses bonded for chromatic aberration correction. Specifically, conditional expression 1 may be a conditional expression related to chromatic aberration elimination in an optical imaging system, and when the range of conditional expressions is met, chromatic aberration may be less likely to occur.

[0081] Furthermore, the optical imaging system according to the embodiment 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×IMG HT)<0.8

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

[0092] In conditional expressions 4 to 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 on the optical axis from the object side of the first lens to the imaging plane, BFL is the distance on the optical axis from the image side of the sixth lens to the imaging plane, IMG HT is half the diagonal length of the imaging plane (i.e., 2×IMG HT is the diagonal length of the imaging plane), and EPD is the diameter of the entrance pupil.

[0093] Conditional expressions 4 through 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. Furthermore, conditional expressions 10 through 12 relate to the miniaturization of the optical imaging system, and conditional expression 13 relates to the brightness performance of the optical imaging system.

[0094] First Implementation Method

[0095] Figure 1A This is a configuration diagram showing the optical imaging system according to the first embodiment. Figure 1B It is shown Figure 1A The graph shows the aberration characteristics of the optical imaging system.

[0096] The optical imaging system 100 according to the first embodiment may 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. An aperture stop may be disposed between the second lens 120 and the third lens 130.

[0097] Furthermore, the optical imaging system 100 may include a filter F and an imaging surface IP disposed on the image side of the sixth lens 160. The imaging surface IP may be the light-receiving portion of an image sensor.

[0098] According to the first embodiment, the total focal length of the optical imaging system 100 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 in the optical imaging system 100 according to the first embodiment can be shown in Table 1 below.

[0100] Table 1

[0101]

[0102]

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

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

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

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

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

[0108] The sixth lens 160 may have negative refractive power, and both the first surface (object side) and the second surface (image side) of the sixth lens 160 may be concave in the 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) of the first lens 110 and the first surface (object side) of the second lens 120 that is engaged with the second surface (image side) 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 may be an aspherical surface.

[0112] The aspherical constants of each lens in the optical imaging system 100 according to the first embodiment can be 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 Implementation Method

[0116] Figure 2A This is a configuration diagram showing the optical imaging system according to the second embodiment. Figure 2B It is shown Figure 2A The graph shows the aberration characteristics of the optical imaging system.

[0117] The optical imaging system 200 according to the second embodiment may 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. An aperture stop may be disposed between the second lens 220 and the third lens 230.

[0118] Furthermore, the optical imaging system 200 may include a filter F and an imaging surface IP disposed on the image side of the sixth lens 260. The imaging surface IP may be the light-receiving portion of an image sensor.

[0119] According to the second embodiment, the total focal length of the optical imaging system 200 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 in the optical imaging system 200 according to the second embodiment can be 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 may have positive refractive power, the first surface (object side) of the first lens 210 may be convex in the paraxial region, and the second surface (image side) of the first lens 210 may be concave in the paraxial region.

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

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

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

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

[0128] The sixth lens 260 may have negative refractive power, and both the first surface (object side) and the second surface (image side) of the sixth lens 260 may 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 cemented lenses.

[0130] For example, the second surface (image side) of the first lens 210 and the first surface (object side) of the second lens 220 that is engaged with the second surface (image side) 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 may be an aspherical surface.

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

[0133] Table 4

[0134]

[0135]

[0136] Third Implementation Method

[0137] Figure 3A This is a configuration diagram showing an optical imaging system according to a third embodiment. Figure 3B It is shown Figure 3A The graph shows the aberration characteristics of the optical imaging system.

[0138] The optical imaging system 300 according to the third embodiment may 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. An aperture stop may be disposed on the object side of the first lens 310.

[0139] Furthermore, the optical imaging system 300 may include a filter F and an imaging surface IP disposed on the image side of the sixth lens 360. The imaging surface IP may be the light-receiving portion of an image sensor.

[0140] According to the third embodiment, the total focal length of the optical imaging system 300 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 in the optical imaging system 300 according to the third embodiment can be shown in Table 5 below.

[0142] Table 5

[0143]

[0144]

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

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

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

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

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

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

[0152] For example, the second surface (image side) of the third lens 330 and the first surface (object side) of the fourth lens 340 which is engaged with the second surface (image side) 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 may be an aspherical surface.

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

[0155] Table 6

[0156]

[0157]

[0158] Fourth Implementation Method

[0159] Figure 4A This is a configuration diagram showing an optical imaging system according to a fourth embodiment. Figure 4B It is shown Figure 4A The graph shows the aberration characteristics of the optical imaging system.

[0160] The optical imaging system 400 according to the fourth embodiment may 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. An aperture stop may be disposed on the object side of the first lens 410.

[0161] Furthermore, the optical imaging system 400 may include a filter F and an imaging surface IP disposed on the image side of the sixth lens 460. The imaging surface IP may be the light-receiving portion of an image sensor.

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

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

[0164] Table 7

[0165]

[0166]

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

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

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

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

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

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

[0174] For example, the second surface (image side) of the third lens 430 and the first surface (object side) of the fourth lens 440, which is engaged with the second surface (image side) 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 may be an aspherical surface.

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

[0177] Table 8

[0178]

[0179]

[0180] Fifth Implementation Method

[0181] Figure 5A This is a configuration diagram showing an optical imaging system according to a fifth embodiment. Figure 5B It is shown Figure 5A The graph shows the aberration characteristics of the optical imaging system.

[0182] The optical imaging system 500 according to the fifth embodiment may 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. An aperture stop may be disposed between the second lens 520 and the third lens 530.

[0183] Furthermore, the optical imaging system 500 may include a filter F and an imaging surface IP disposed on the image side of the sixth lens 560. The imaging surface IP may be the light-receiving portion of an image sensor.

[0184] According to the fifth embodiment, the total focal length of the optical imaging system 500 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 in the optical imaging system 500 according to the fifth embodiment can be 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 may have positive refractive power, the first surface (object side) of the first lens 510 may be convex in the paraxial region, and the second surface (image side) of the first lens 510 may be concave in the paraxial region.

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

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

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

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

[0193] The sixth lens 560 may have negative refractive power, and both the first surface (object side) and the second surface (image side) of the sixth lens 560 may 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 cemented lenses.

[0195] For example, the second surface (image side) of the first lens 510 and the first surface (object side) of the second lens 520 that is engaged with the second surface (image side) 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 to the sixth lens 560 may be an aspherical surface.

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

[0198] Table 10

[0199]

[0200]

[0201] Sixth Implementation Method

[0202] Figure 6A This is a configuration diagram showing the optical imaging system according to the sixth embodiment. Figure 6B It is shown Figure 6A The graph shows the aberration characteristics of the optical imaging system.

[0203] The optical imaging system 600 according to the sixth embodiment may 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. An aperture stop may be disposed between the second lens 620 and the third lens 630.

[0204] Furthermore, the optical imaging system 600 may include a filter F and an imaging surface IP disposed on the image side of the sixth lens 660. The imaging surface IP may be the light-receiving portion of an image sensor.

[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 in the optical imaging system 600 according to the sixth embodiment can be shown in Table 11 below.

[0207] Table 11

[0208]

[0209]

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

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

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

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

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

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

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

[0217] For example, the second surface (image side) of the first lens 610 and the first surface (object side) of the second lens 620 that is engaged with the second surface (image side) 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 may be an aspherical surface.

[0219] The aspherical constant of each lens in the optical imaging system 600 according to the sixth embodiment can be 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 Implementation Method

[0223] Figure 7A This is a configuration diagram showing the optical imaging system according to the seventh embodiment. Figure 7B It is shown Figure 7A The graph shows the aberration characteristics of the optical imaging system.

[0224] The optical imaging system 700 according to the seventh embodiment may 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. An aperture stop may be disposed on the object side of the first lens 710.

[0225] Furthermore, the optical imaging system 700 may include a filter F and an imaging surface IP disposed on the image side of the sixth lens 760. The imaging surface IP may be the light-receiving portion of an image sensor.

[0226] According to the seventh embodiment, the total focal length of the optical imaging system 700 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 in the optical imaging system 700 according to the seventh embodiment can be 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 may have positive refractive power, the first surface (object side) of the first lens 710 may be convex in the paraxial region, and the second surface (image side) of the first lens 710 may be concave in the paraxial region.

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

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

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

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

[0235] The sixth lens 760 may have negative refractive power, the first surface (object side) of the sixth lens 760 may be convex in the paraxial region, and the second surface (image side) of the sixth lens 760 may 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) of the third lens 730 and the first surface (object side) of the fourth lens 740, which is engaged with the second surface (image side) 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 may be an aspherical surface.

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

[0240] Table 14

[0241]

[0242]

[0243] Eighth Implementation Method

[0244] Figure 8A This is a configuration diagram showing the optical imaging system according to the eighth embodiment. Figure 8B It is shown Figure 8A The graph shows the aberration characteristics of the optical imaging system.

[0245] The optical imaging system 800 according to the eighth embodiment may 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. An aperture stop may be disposed on the object side of the first lens 810.

[0246] Furthermore, the optical imaging system 800 may include a filter F and an imaging surface IP disposed on the image side of the sixth lens 860. The imaging surface IP may be the light-receiving portion of an image sensor.

[0247] According to the eighth embodiment, the total focal length of the optical imaging system 800 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 in the optical imaging system 800 according to the eighth embodiment can be 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 may have positive refractive power, the first surface (object side) of the first lens 810 may be convex in the paraxial region, and the second surface (image side) of the first lens 810 may be concave in the paraxial region.

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

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

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

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

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

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

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

[0261] Table 16

[0262]

[0263]

[0264] The conditional expression data according to the implementation method is shown in Table 17 below.

[0265] Table 17

[0266] conditional expression Implementation Method 1 Implementation Method 2 Implementation Method 3 Implementation Method 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 / (2×IMG HT) 0.622 0.622 0.683 0.683 f / EPD 1.969 1.893 2.269 2.271 conditional expression Implementation Method 5 Implementation Method 6 Implementation Method 7 Implementation Method 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 / (2×IMG HT) 0.708 0.711 0.772 0.759 f / EPD 1.969 1.892 2.290 2.270

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

[0268] While specific examples have been shown and described above, it will be apparent upon understanding this disclosure that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be understood in a descriptive sense only and not for limiting purposes. The description of features or aspects in each example should be considered applicable to similar features or aspects in other examples. Suitable results may still be achieved if the described techniques are performed in a different order, and / or if components in the described system, architecture, device, or circuit are combined in different ways and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of this disclosure is not limited by the specific embodiments but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in this disclosure.

Claims

1. An optical imaging system, characterized in that, The optical imaging system includes: 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. The first lens and the second lens, or the third lens and the fourth lens, are configured as cemented lenses.

2. The optical imaging system according to claim 1, Its features are, 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, Its features are, 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, Its features are, 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, characterized in that, The object-side surface of the fifth lens is concave in the paraxial region.

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

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

8. The optical imaging system according to claim 1, characterized in that, 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, characterized in that, The first lens through the sixth lens are made of plastic material.

10. An optical imaging system, characterized in that, The optical imaging system includes: 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, Wherein, TTL is the distance along the optical axis from the object side of the first lens to the imaging surface, and IMG HT is half the diagonal length of the imaging surface.

11. The optical imaging system according to claim 10, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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.

Images