Optical image capturing system

Abstract

An optical imaging system is provided. The optical image capturing system includes 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 refractive power, a sixth lens having a positive refractive power, and a seventh lens having a negative refractive power, wherein the first to seventh lenses are disposed in order from the object side, and wherein the first to seventh lenses include a cemented lens formed by bonding adjacent surfaces of two lenses disposed adjacent to each other, and wherein the two lenses forming the cemented lens have opposite refractive powers.

Description

[0001] Cross Reference to Related Applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0072303, filed on June 3, 2024, in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety for all purposes. TECHNICAL FIELD

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

[0004] Recently, the performance of a camera mounted on a mobile device has been improved.

[0005] For example, a high-resolution image sensor is employed in a camera for a mobile device, and an optical system has also been developed accordingly.

[0006] Generally, as the size of an image sensor increases, the total optical length of an optical system increases. However, since it can be desirable for a mobile device to have a slim size, it can be desirable to develop an optical system that can solve a problem of performance reduction due to slimming and that can achieve high resolution. SUMMARY

[0007] The purpose of the summary is to introduce in a simplified form the selection of concepts made by the inventor(s) for the claimed subject matter, which will be further described in the DETAILED DESCRIPTION section. The purpose of the summary is not to identify key or essential features of the claimed subject matter, nor is it intended to be used to determine the scope of the claimed subject matter.

[0008] In a general aspect, an optical imaging system includes a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a negative refractive power, a fifth lens having a refractive power, a sixth lens having a positive refractive power, and a seventh lens having a negative refractive power, wherein the first lens to the seventh lens are sequentially disposed from an object side, wherein the first lens to the seventh lens include a cemented lens formed by combining adjacent surfaces of two lenses disposed adjacent to each other, and wherein the two lenses forming the cemented lens have opposite refractive powers.

[0009] The first lens and the second lens or the second lens and the third lens can be disposed as a cemented lens.

[0010] The cemented lens can satisfy a 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 among two lenses combined with each other, and fb and Vb are a focal length and an Abbe number of a lens disposed on an image side among the two lenses combined with each other.

[0011] The third lens can have a convex object side surface in a paraxial region.

[0012] The fourth lens can have a concave object side surface in a paraxial region.

[0013] The object side surface of the sixth lens and the image side surface of the sixth lens can both be convex in a paraxial region.

[0014] The seventh lens can have a convex object side surface in a paraxial region.

[0015] A conditional expression: 1.0 < TTL / f < 1.3 can be satisfied, where TTL is a distance on an optical axis from an object side surface of the first lens to an image plane, and f is a total focal length of the optical imaging system.

[0016] The fifth lens can have a negative refractive power.

[0017] In a general aspect, an 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 refractive power, a sixth lens having a positive refractive power, and a seventh lens having a negative refractive power, wherein the first lens to the seventh lens are sequentially disposed from an object side, wherein a conditional expression: 0.5 < TTL / (2 x IMG HT) < 0.8 is satisfied, where TTL is a distance on an optical axis from an object side surface of the first lens to an image plane, and IMG HT is half of a diagonal length of the image plane.

[0018] A conditional expression: 5 < |f5 / f| < 10 can be satisfied, where f5 is a focal length of the fifth lens, and f is a total focal length of the optical imaging system.

[0019] A conditional expression: 0.5 < f6 / f < 3 can be satisfied, where f6 is a focal length of the sixth lens, and f is a total focal length of the optical imaging system.

[0020] A conditional expression: 1 < f3 / f < 3 can be satisfied, where f3 is a focal length of the third lens, and f is a total focal length of the optical imaging system.

[0021] The third lens can have a convex object side surface in a paraxial region.

[0022] The object side surface of the second lens can be cemented to the image side surface of the first lens, or the image side surface of the second lens can be cemented to the object side surface of the third lens.

[0023] The first lens can have a positive refractive power, and the second lens can have a negative refractive power.

[0024] In a general aspect, an 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 refractive power, a sixth lens having a positive refractive power, and a seventh lens having a negative refractive power, wherein the first lens to the seventh lens are sequentially arranged from an object side, wherein a condition expression -10 < f4 / f < -1 is satisfied, where f4 is a focal length of the fourth lens, and f is a total focal length of the optical imaging system.

[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 exemplary optical imaging system according to a first embodiment.

[0027] Figure 1B is a configuration diagram illustrating an exemplary optical imaging system according to a second embodiment. Figure 1A is a graph representing aberration characteristics of the exemplary optical imaging system illustrated in FIG. 2.

[0028] Figure 2A is a configuration diagram illustrating an exemplary optical imaging system according to a third embodiment.

[0029] Figure 2B is a configuration diagram illustrating an exemplary optical imaging system according to a fourth embodiment. Figure 2A is a graph representing aberration characteristics of the exemplary optical imaging system illustrated in FIG. 4.

[0030] Figure 3A is a configuration diagram illustrating an exemplary optical imaging system according to a fifth embodiment.

[0031] Figure 3B is a graph representing aberration characteristics of the exemplary optical imaging system illustrated in FIG. 6. Figure 3A

[0032] is a configuration diagram illustrating an exemplary optical imaging system according to a sixth embodiment. Figure 4A

[0033] is a graph representing aberration characteristics of the exemplary optical imaging system illustrated in FIG. 8. Figure 4B Figure 4A is a configuration diagram illustrating an exemplary optical imaging system according to a seventh embodiment.

[0034] Figure 5A is a graph representing aberration characteristics of the exemplary optical imaging system illustrated in FIG. 10.

[0035] Figure 5B Figure 5A ​​A graph showing aberration characteristics of an exemplary optical imaging system according to the first embodiment.

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

[0037] Figure 6B is a graph showing aberration characteristics of an exemplary optical imaging system according to the sixth embodiment. Figure 6A

[0038] Figure 7A is a configuration diagram showing an exemplary optical imaging system according to the seventh embodiment.

[0039] Figure 7B is a graph showing aberration characteristics of an exemplary optical imaging system according to the seventh embodiment. Figure 7A

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

[0041] Figure 8B is a graph showing aberration characteristics of an exemplary optical imaging system according to the eighth embodiment. Figure 8A

[0042] Throughout the drawings and specific embodiments, identical reference numerals direct to identical elements. The drawings can not be to scale and the dimensions, proportions, and shapes of the elements in the drawings can be exaggerated for clarity, illustration and convenience. DETAILED DESCRIPTION

[0043] The following detailed description is provided to help the reader understand the methods, apparatus and / or systems described herein. However, various changes, modifications and equivalents can be resorted to by those skilled in the art after understanding the nature of the application disclosed herein. For example, the order of the operations described herein and / or the order of the operations described herein is merely exemplary and is not limited to the order described herein except when the order of the operations described herein and / or the order of the operations is essential to the operation of the application, which will be apparent to one of ordinary skill in the art having the benefit of the present disclosure. As another example, at least a portion of the order of the operations and / or the order of the operations can be performed in parallel except when the order of the operations described herein and / or the order of the operations is essential to the operation of the application. In addition, descriptions of features known to one of ordinary skill in the art after understanding the present disclosure can be omitted for the sake of clarity and conciseness.

[0044] ​​​Although terms such as “first,” “second,” and “third,” or A, B, (a), (b), 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. Each of these terms is not intended to define, for example, the importance, sequence, or order of the corresponding component, part, region, layer, or section, but only to distinguish the corresponding component, part, region, layer, or section from other components, parts, regions, layers, or sections. 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 the second component, second part, second region, second layer, or second section.

[0045] Throughout this specification, when a component, element, or layer is described as "on another component, element, or layer," "connected to," "attached to," or "joined to" another component, element, or layer, it may be directly "on another component, element, or layer," directly "connected to," "attached to," or "joined to" another component, element, or layer (e.g., in contact with another component, element, or layer), or one or more other components, elements, or layers may reasonably be present between that component, element, or layer and that other component, element, or layer. When a component, element, or layer is described as "directly on another component, element, or layer," "directly connected to," "directly attached to," or "directly joined to" another component, element, or layer, then there are no other components, elements, or layers between that component, element, or layer and that other component, element, or layer. Similarly, expressions such as "between" and "directly between," and "adjacent" and "directly adjacent" may also be interpreted as described above.

[0046] The terminology used herein is for 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 equally include the plural forms. As non-limiting examples, 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, or alternatives to the stated features, quantities, operations, components, elements, and / or combinations thereof. Furthermore, while one embodiment may describe the presence of the stated features, quantities, operations, components, elements, and / or combinations thereof using the terms “comprising,” “including,” and “having,” other embodiments may exist in which one or more of the stated features, quantities, operations, components, elements, and / or combinations thereof are absent.

[0047] As used herein, the term "and / or," includes any one of the listed items, as well as any combination of any of the listed items. The phrase "at least one of A, B, and C," among others, is intended to have the meaning ascribed to it in the above paragraph, and is also intended to include any of the examples of A, B, and C individually, as well as any combination with any of the examples of A, B, and C other than the combinations already specificed in the above paragraph.

[0048] The features described herein can be embodied in different forms, and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely for the purpose of illustration so that those skilled in the art will understand how the methods, apparatuses, and / or systems described herein can be implemented in a number of possible ways. In the description herein, the use of the phrase "may" (e.g., with respect to what an example or embodiment can include or implement) means that there is at least one example or embodiment for which the feature is included or implemented, and that not all examples or embodiments are limited to this. The phrase "example" or "embodiment" as used herein has the same meaning (e.g., the phrase "in one example" has the same meaning as "in one embodiment," and "in one or more examples" has the same meaning as "in one or more embodiments").

[0049] One or more embodiments can provide an optical imaging system having a small size, which can obtain a high resolution image.

[0050] In the drawings, the thickness, size, and shape of the lenses can be exaggerated to facilitate description, and the spherical shape or aspherical shape of the lenses is merely an example, and is not limited thereto.

[0051] In an embodiment, the first lens can represent a lens closest to the object side, and the seventh lens can represent a lens closest to the image sensor side (or image side).

[0052] Further, in each lens, the first surface can represent a surface closest to the object side (or object side surface), and the second surface can represent a surface closest to the image sensor side (or image side surface).

[0053] In the description related to the shape of the lens of the embodiments, a convex surface can mean that a paraxial region (a narrow region near the optical axis) portion of the lens surface can be convex, and a concave surface can mean that a paraxial region portion of the lens surface can be concave. Thus, even when one surface of the lens is described as having a convex shape, an edge portion of the lens can be concave. Similarly, although one surface of the lens is described as having a concave shape, an edge portion of the lens can be convex.

[0054] In the embodiments, the unit of the length-related parameters, including the radius of curvature, the thickness, the distance, and the focal length of the lens, can be millimeters (mm), and the unit of the field of view can be degrees (°).

[0055] The optical imaging system according to the embodiments can include seven lenses. For example, the optical imaging system can include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, which are sequentially disposed from the object side.

[0056] However, the optical imaging system according to the embodiments can not include only seven lenses.

[0057] 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.

[0058] 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. In an example, the filter can be disposed between the seventh lens and the image sensor.

[0059] In addition, in an example, the optical imaging system can further include a diaphragm configured to adjust the amount of light.

[0060] The optical imaging system according to the embodiments can include a cemented lens. For example, two lenses disposed adjacent to each other among the first lens to the seventh lens can be provided as a cemented lens.

[0061] Specifically, the cemented lens can be provided 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 combined with each other. In this example, the two surfaces combined with each other can preferably be the same aspherical surfaces or the same spherical surfaces.

[0062] According to the embodiments, the two lenses disposed adjacent to each other provided as the cemented lens can be combined by an adhesive. For example, an adhesive satisfying a predetermined condition of refractive index and Abbe number can be used for the lens combination, and the adhesive can be applied between the two lenses disposed adjacent to each other in a thickness of about 1 μm to 50 μm.

[0063] According to the embodiment, in the example, the refractive powers of two lenses arranged adjacent to each other and configured as cemented lenses can be opposite to each other. In a non-limiting example, among the two lenses configured as cemented lenses, the lens arranged closer to the object side can have positive or negative refractive power, and the lens arranged closer to the image side can have negative or positive refractive power.

[0064] An optical imaging system according to an embodiment may include lenses formed of a plastic material. In a non-limiting example, all of the first to seventh lenses included in the optical imaging system may be formed of a plastic material.

[0065] Furthermore, each lens can have different optical properties than adjacent lenses. For example, adjacent lenses can have different refractive indices and Abbe numbers.

[0066] The optical imaging system according to the embodiment may include an aspherical surface lens. That is, at least one surface of at least one of the first to seventh lenses included in the optical imaging system may be an aspherical surface. Preferably, at least one surface of each of the first to seventh lenses may be an aspherical surface.

[0067] In the example, the aspherical surface of each lens can be represented by Equation 1 below.

[0068] Equation 1:

[0069]

[0070] In Equation 1, c is the curvature of the lens (the reciprocal of the radius of curvature), K is the conic constant, Y is the distance from any point on the aspherical surface of the lens to the optical axis, AH, J and LP 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.

[0071] The optical imaging system according to the embodiment can satisfy the following conditional expression:

[0072] Conditional expression 1: 0 ≤ |fa / Va - fb / Vb| < 2

[0073] Conditional expression 2: 10 <Vc<80

[0074] Conditional expression 3: Nb <Nc<Na

[0075] In the conditional expression 1, fa and Va can be a focal length and an Abbe number of a lens disposed on an object side among two lenses combined with each other, respectively, and fb and Vb can be a focal length and an Abbe number of a lens disposed on an image side among the two lenses combined with each other, respectively. Also, in the conditional expression 2 and the conditional expression 3, Vc can be an Abbe number of an adhesive, and Nc can be a refractive index of the adhesive.

[0076] The conditional expressions 1 to 3 can be related to an optical property condition of an adhesive used in the cemented lens and an optical property condition of the lens combined for chromatic aberration correction. In particular, the conditional expression 1 can be a condition expression related to chromatic aberration elimination of the optical imaging system, and when the conditional expression range is satisfied, it is less likely that chromatic aberration occurs.

[0077] Also, the optical imaging system according to the embodiment can satisfy at least one of the following conditional expressions:

[0078] Conditional expression 4: 0.5 < f1 / f < 2

[0079] Conditional expression 5: -3 < f2 / f < -1

[0080] Conditional expression 6: 1 < f3 / f < 3

[0081] Conditional expression 7: -10 < f4 / f < -1

[0082] Conditional expression 8: 5 < |f5 / f| < 10

[0083] Conditional expression 9: 0.5 < f6 / f < 3

[0084] Conditional expression 10: -1 < f7 / f < 0

[0085] Conditional expression 11: 1.0 < TTL / f < 1.3

[0086] Conditional expression 12: 0 < BFL / f < 0.3

[0087] Conditional expression 13: 0.5 < TTL / (2 x IMG HT) < 0.8

[0088] Conditional expression 14: 1 < f / EPD < 3

[0089] 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 seventh 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 can be the diameter of the entrance pupil.

[0090] 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. Additionally, conditional expressions 10 through 12 can be related to the miniaturization of the optical imaging system, and conditional expression 13 can be related to the brightness performance of the optical imaging system.

[0091] First Implementation Method

[0092] Figure 1A This is a configuration diagram illustrating an exemplary optical imaging system according to a first embodiment. Figure 1B It means Figure 1A The graph shows the aberration characteristics of the exemplary optical imaging system.

[0093] 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, a sixth lens 160, and a seventh lens 170. An aperture stop may be provided between the second lens 120 and the third lens 130.

[0094] Additionally, the optical imaging system 100 may include a filter F and an imaging surface IP disposed on the image side of the seventh lens 170. The imaging surface IP may be part of an image sensor in which light is received.

[0095] The optical imaging system 100 according to the first embodiment may have a total focal length of 5.90 mm, an IMGHT of 6.00 mm, and a FOV of 88.727 degrees (°).

[0096] The characteristics of each lens in the optical imaging system 100 according to the first embodiment can have the values ​​shown in Table 1 below.

[0097] Table 1

[0098] Face No. Label Radius of curvature Thickness / distance Refractive index Abbe number Focal length S1 First lens 2.583 0.996 1.519 59.98 6.06 S2 12.294 0.000 S3 Second lens 12.294 0.312 1.710 19.73 -15.45 S4 5.769 0.198 S5 Third lens 16.492 0.397 1.587 61.47 13.74 S6 -15.756 0.391 S7 Fourth lens -10.993 0.263 1.686 31.41 -23.38 S8 -34.749 0.214 S9 Fifth lens 6.610 0.564 1.635 23.96 -55.34 S10 5.386 0.361 S11 Sixth lens 6.090 0.653 1.567 37.40 7.90 S12 -16.652 1.288 S13 Seventh lens 45.780 0.470 1.535 55.74 -4.67 S14 2.371 0.254 S15 Filter Infinity 0.140 1.517 64.20 S16 Infinity 0.498 S17 Imaging surface Infinity

[0099] According to the first embodiment, the first lens 110 can have a positive refractive power, the first surface (object side surface) of the first lens 110 can be convex in the paraxial region, and the second surface (image side surface) of the first lens 110 can be concave in the paraxial region.

[0100] The second lens 120 can have a negative refractive power, the first surface (object side surface) of the second lens 120 can be convex in the paraxial region, and the second surface (image side surface) of the second lens 120 can be concave in the paraxial region.

[0101] The third lens 130 can have a positive refractive power, and both the first surface (object side surface) of the third lens 130 and the second surface (image side surface) of the third lens 130 can be convex in the paraxial region.

[0102] The fourth lens 140 can have a negative refractive power, the first surface (object side surface) of the fourth lens 140 can be concave in the paraxial region, and the second surface (image side surface) of the fourth lens 140 can be convex in the paraxial region.

[0103] The fifth lens 150 can have a negative refractive power, the first surface (object side surface) of the fifth lens 150 can be convex in the paraxial region, and the second surface (image side surface) of the fifth lens 150 can be concave in the paraxial region.

[0104] The sixth lens 160 can have a positive refractive power, the first surface (object side surface) of the sixth lens 160 can be convex in the paraxial region, and the second surface (image side surface) of the sixth lens 160 can be concave in the paraxial region.

[0105] The seventh lens 170 can have a negative refractive power, the first surface (object side surface) of the seventh lens 170 can be convex in the paraxial region, and the second surface (image side surface) of the seventh lens 170 can be concave in the paraxial region.

[0106] According to the first embodiment, the first lens 110 and the second lens 120 can be cemented lenses.

[0107] 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 bonded to the second surface (image side surface) of the first lens 110 can be spherical.

[0108] According to the first embodiment, at least one surface of each of the first lens 110 to the seventh lens 170 can be aspherical.

[0109] The aspherical constant of each lens of the optical imaging system 100 according to the first embodiment can have values as shown in Table 2 below.

[0110] Table 2

[0111]

[0112]

[0113] Second Embodiment

[0114] Figure 2A is a configuration diagram illustrating an exemplary optical imaging system according to the second embodiment. Figure 2B is a graph representing Figure 2A aberration characteristics of the exemplary optical imaging system shown in

[0115] 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, a sixth lens 260, and a seventh lens 270. A stop can be disposed between the second lens 220 and the third lens 230.

[0116] In addition, the optical imaging system 200 can include a filter F and an imaging plane IP disposed on an image side of the seventh lens 270. The imaging plane IP can be a portion of an image sensor in which light is received.

[0117] The optical imaging system 200 according to the second embodiment can have a total focal length of 5.89 mm, an IMGHT of 6.00 mm, and a FOV of 88.80 degrees (°).

[0118] The characteristics of each lens of the optical imaging system 200 according to the second embodiment can have values as shown in Table 3 below.

[0119] Table 3

[0120] Face No. Label Radius of curvature Thickness / distance Refractive index Abbe number Focal length S1 First lens 2.583 0.997 1.519 59.99 6.02 S2 12.624 0.000 S3 Second lens 12.624 0.313 1.709 19.60 -15.09 S4 5.769 0.197 S5 Third lens 16.489 0.396 1.588 61.78 13.72 S6 -15.751 0.391 S7 Fourth lens -10.956 0.263 1.686 31.63 -23.36 S8 -34.411 0.214 S9 Fifth lens 6.624 0.564 1.635 23.96 -55.52 S10 5.399 0.360 S11 Sixth lens 6.090 0.655 1.567 37.40 7.89 S12 -16.605 1.290 S13 Seventh lens 45.778 0.470 1.535 55.74 -4.72 S14 2.396 0.254 S15 Filter Infinity 0.140 1.517 64.20 S16 Infinity 0.503 S17 Imaging surface Infinity

[0121] According to the second embodiment, the first lens 210 can have a positive refractive power, a first surface (object side surface) of the first lens 210 can be convex in a paraxial region, and a second surface (image side surface) of the first lens 210 can be concave in the paraxial region.

[0122] The second lens 220 can have a negative refractive power, a first surface (object side surface) of the second lens 220 can be convex in a paraxial region, and a second surface (image side surface) of the second lens 220 can be concave in the paraxial region.

[0123] The third lens 230 can have a positive refractive power, and both a first surface (object side surface) of the third lens 230 and a second surface (image side surface) of the third lens 230 can be convex in a paraxial region.

[0124] The fourth lens 240 can have a negative refractive power, the first surface (object side surface) of the fourth lens 240 can be concave in the paraxial region, and the second surface (image side surface) of the fourth lens 240 can be convex in the paraxial region.

[0125] The fifth lens 250 can have a negative refractive power, the first surface (object side surface) of the fifth lens 250 can be convex in the paraxial region, and the second surface (image side surface) of the fifth lens 250 can be concave in the paraxial region.

[0126] The sixth lens 260 can have a positive 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 convex in the paraxial region.

[0127] The seventh lens 270 can have a negative refractive power, the first surface (object side surface) of the seventh lens 270 can be convex in the paraxial region, and the second surface (image side surface) of the seventh lens 270 can be concave in the paraxial region.

[0128] According to the second embodiment, the first lens 210 and the second lens 220 can be cemented lenses.

[0129] 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 combined to the second surface (image side surface) of the first lens 210 can be aspherical.

[0130] According to the second embodiment, at least one surface of each of the first lens 210 to the seventh lens 270 can be aspherical.

[0131] The aspherical constant of each lens of the optical imaging system 200 according to the second embodiment can have values as shown in Table 4 below.

[0132] Table 4

[0133]

[0134]

[0135] Third Embodiment

[0136] Figure 3A is a configuration diagram illustrating an exemplary optical imaging system according to the third embodiment. Figure 3B is a graph representing Figure 3A aberration characteristics of the exemplary optical imaging system shown in

[0137] 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, a sixth lens 360, and a seventh lens 370. A diaphragm can be disposed between the second lens 320 and the third lens 330.

[0138] In addition, the optical imaging system 300 can include a filter F and an imaging plane IP disposed on an image side of the seventh lens 370. The imaging plane IP can be a portion of an image sensor in which light is received.

[0139] The optical imaging system 300 according to the third embodiment can have a total focal length of 6.36 mm, an IMGHT of 6.00 mm, and a FOV of 84.00 degrees (°).

[0140] The characteristics of each lens of the optical imaging system 300 according to the third embodiment can have values as shown in Table 5 below.

[0141] Table 5

[0142] Face No. Label Radius of curvature Thickness / distance Refractive index Abbe number Focal length S1 First lens 2.670 1.018 1.565 59.95 6.19 S2 9.623 0.212 S3 Second lens 20.672 0.283 1.710 27.38 -7.32 S4 4.157 0.000 S5 Third lens 4.157 0.454 1.590 72.91 9.08 S6 17.614 0.461 S7 Fourth lens -25.211 0.388 1.702 24.47 -60.12 S8 -62.065 0.425 S9 Fifth lens 7.818 0.336 1.679 32.61 -53.15 S10 6.322 0.452 S11 Sixth lens 7.993 0.782 1.567 37.40 7.94 S12 -10.082 1.270 S13 Seventh lens 55.434 0.433 1.535 55.74 -5.90 S14 2.988 0.258 S15 Filter Infinity 0.142 1.517 64.20 S16 Infinity 0.577 S17 Imaging surface Infinity

[0143] 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.

[0144] 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.

[0145] The third lens 330 can have a positive refractive power, a first surface (object side surface) of the third lens 330 can be convex in a paraxial region, and a second surface (image side surface) of the third lens 330 can be concave in the paraxial region.

[0146] 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.

[0147] The fifth lens 350 can have a negative refractive power, a first surface (object side surface) of the fifth lens 350 can be convex in a paraxial region, and a second surface (image side surface) of the fifth lens 350 can be concave in the paraxial region.

[0148] The sixth lens 360 can have a positive refractive power, and both the first surface (object side surface) of the sixth lens 360 and the second surface (image side surface) of the sixth lens 360 can be convex in the paraxial region.

[0149] The seventh lens 370 can have a negative refractive power, the first surface (object side surface) of the seventh lens 370 can be convex in the paraxial region, and the second surface (image side surface) of the seventh lens 370 can be concave in the paraxial region.

[0150] According to the third embodiment, the second lens 320 and the third lens 330 can be cemented lenses.

[0151] For example, the second surface (image side surface) of the second lens 320 and the first surface (object side surface) of the third lens 330 bonded to the second surface (image side surface) of the second lens 320 can be spherical.

[0152] According to the third embodiment, at least one surface of each of the first lens 310 to the seventh lens 370 can be aspherical.

[0153] The aspherical constant of each lens of the optical imaging system 300 according to the third embodiment can have values as shown in Table 6 below.

[0154] Table 6

[0155]

[0156]

[0157] Fourth Embodiment

[0158] Figure 4A is a configuration diagram illustrating an exemplary optical imaging system according to the fourth embodiment. Figure 4B is a graph representing Figure 4A aberration characteristics of the exemplary optical imaging system shown in

[0159] The optical imaging system 400 according to the fourth embodiment can include a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, a sixth lens 460, and a seventh lens 470. A stop can be disposed between the second lens 420 and the third lens 430.

[0160] In addition, the optical imaging system 400 can include a filter F disposed on the image side of the seventh lens 470 and an imaging plane IP. The imaging plane IP can be a portion of an image sensor that receives light.

[0161] The optical imaging system 400 according to the fourth embodiment can have a total focal length of 6.32 mm, an IMGHT of 6.00 mm, and a FOV of 84.20 degrees (°).

[0162] The properties of each lens of the optical imaging system 400 according to the fourth embodiment can have values as shown in Table 7 below.

[0163] Table 7

[0164] Face No. Label Radius of curvature Thickness / distance Refractive index Abbe number Focal length S1 First lens 2.670 1.020 1.568 56.55 6.16 S2 9.584 0.211 S3 Second lens 20.428 0.282 1.707 24.55 -7.05 S4 4.017 0.000 S5 Third lens 4.017 0.452 1.590 55.55 8.67 S6 17.585 0.463 S7 Fourth lens -25.349 0.391 1.701 26.92 -60.12 S8 -63.224 0.424 S9 Fifth lens 7.852 0.333 1.676 33.04 -54.13 S10 6.361 0.454 S11 Sixth lens 7.989 0.813 1.567 37.40 7.95 S12 -10.113 1.274 S13 Seventh lens 55.651 0.417 1.535 55.74 -5.82 S14 2.952 0.258 S15 Filter Infinity 0.142 1.517 64.20 S16 Infinity 0.537 S17 Imaging surface Infinity

[0165] According to the fourth embodiment, the first lens 410 can have a positive refractive power, the first surface (object side surface) of the first lens 410 can be convex in the paraxial region, and the second surface (image side surface) of the first lens 410 can be concave in the paraxial region.

[0166] The second lens 420 can have a negative refractive power, the first surface (object side surface) of the second lens 420 can be convex in the paraxial region, and the second surface (image side surface) of the second lens 420 can be concave in the paraxial region.

[0167] The third lens 430 can have a positive refractive power, the first surface (object side surface) of the third lens 430 can be convex in the paraxial region, and the second surface (image side surface) of the third lens 430 can be concave in the paraxial region.

[0168] The fourth lens 440 can have a negative refractive power, the first surface (object side surface) of the fourth lens 440 can be concave in the paraxial region, and the second surface (image side surface) of the fourth lens 440 can be convex in the paraxial region.

[0169] The fifth lens 450 can have a negative refractive power, the first surface (object side surface) of the fifth lens 450 can be convex in the paraxial region, and the second surface (image side surface) of the fifth lens 450 can be concave in the paraxial region.

[0170] The sixth lens 460 can have a positive refractive power, and both the first surface (object side surface) of the sixth lens 460 and the second surface (image side surface) of the sixth lens 460 can be convex in the paraxial region.

[0171] The seventh lens 470 can have a negative refractive power, the first surface (object side surface) of the seventh lens 470 can be convex in the paraxial region, and the second surface (image side surface) of the seventh lens 470 can be concave in the paraxial region.

[0172] According to the fourth embodiment, the second lens 420 and the third lens 430 can be cemented lenses.

[0173] For example, the second surface (image side) of the second lens 420 and the first surface (object side) of the third lens 430 combined to the second surface (image side) of the second lens 420 can be aspherical.

[0174] According to the fourth embodiment, at least one surface of each of the first lens 410 to the seventh lens 470 can be aspherical.

[0175] The aspherical constant of each lens of the optical imaging system 400 according to the fourth embodiment can have values as shown in Table 8 below.

[0176] Table 8

[0177]

[0178]

[0179] Fifth Embodiment

[0180] Figure 5A is a configuration diagram illustrating an exemplary optical imaging system according to the fifth embodiment. Figure 5B is a graph representing Figure 5A aberration characteristics of the exemplary optical imaging system shown in

[0181] 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, a sixth lens 560, and a seventh lens 570. A stop can be disposed between the second lens 520 and the third lens 530.

[0182] In addition, the optical imaging system 500 can include a filter F disposed on the image side of the seventh lens 570 and an imaging plane IP. The imaging plane IP can be a portion of an image sensor that receives light.

[0183] The total focal length of the optical imaging system 500 according to the fifth embodiment can be 6.49 mm, the IMG HT can be 6.00 mm, and the FOV can be 83.20 degrees (°).

[0184] The characteristics of each lens of the optical imaging system 500 according to the fifth embodiment can have values as shown in Table 9 below.

[0185] Table 9

[0186] Face No. Label Radius of curvature Thickness / distance Refractive index Abbe number Focal length S1 First lens 2.841 1.096 1.519 59.98 6.67 S2 13.523 0.000 S3 Second lens 13.523 0.343 1.710 19.73 -16.99 S4 6.345 0.217 S5 Third lens 18.141 0.437 1.587 61.47 15.11 S6 -17.332 0.430 S7 Fourth lens -12.092 0.289 1.686 31.41 -25.71 S8 -38.224 0.235 S9 Fifth lens 7.271 0.620 1.635 23.96 -60.87 S10 5.925 0.397 S11 Sixth lens 6.699 0.718 1.567 37.40 8.69 S12 -18.318 1.417 S13 Seventh lens 50.358 0.517 1.535 55.74 -5.14 S14 2.608 0.280 S15 Filter Infinity 0.154 1.517 64.20 S16 Infinity 0.548 S17 Imaging surface Infinity

[0187] 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.

[0188] 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.

[0189] The third lens 530 can have a positive refractive power, and both the first surface (object side surface) of the third lens 530 and the second surface (image side surface) of the third lens 530 can be convex in the paraxial region.

[0190] The fourth lens 540 can have a negative refractive power, the first surface (object side surface) of the fourth lens 540 can be concave in the paraxial region, and the second surface (image side surface) of the fourth lens 540 can be convex in the paraxial region.

[0191] The fifth lens 550 can have a negative refractive power, the first surface (object side surface) of the fifth lens 550 can be convex in the paraxial region, and the second surface (image side surface) of the fifth lens 550 can be concave in the paraxial region.

[0192] The sixth lens 560 can have a positive 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 convex in the paraxial region.

[0193] The seventh lens 570 can have a negative refractive power, the first surface (object side surface) of the seventh lens 570 can be convex in the paraxial region, and the second surface (image side surface) of the seventh lens 570 can be concave in the paraxial region.

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

[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 combined to the second surface (image side surface) of the first lens 510 can be spherical.

[0196] According to the fifth embodiment, at least one surface of each of the first lens 510 to the seventh lens 570 can be aspherical.

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

[0198] Table 10

[0199]

[0200]

[0201] Sixth Implementation Method

[0202] Figure 6A This is a configuration diagram illustrating an exemplary optical imaging system according to a sixth embodiment. Figure 6B It means Figure 6A The graph shows the aberration characteristics of the exemplary 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, a sixth lens 660, and a seventh lens 670. An aperture stop may be disposed between the second lens 620 and the third lens 630.

[0204] Additionally, the optical imaging system 600 may include a filter F and an imaging surface IP disposed on the image side of the seventh lens 670. The imaging surface IP may be part of an image sensor in which light is received.

[0205] The optical imaging system 600 according to the sixth embodiment may have a total focal length of 6.48 mm, an IMGHT of 6.00 mm, and a FOV of 83.40 degrees (°).

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

[0207] Table 11

[0208] Face No. Label Radius of curvature Thickness / distance Refractive index Abbe number Focal length S1 First lens 2.841 1.096 1.519 59.99 6.63 S2 13.886 0.000 S3 Second lens 13.886 0.344 1.709 19.60 -16.60 S4 6.346 0.217 S5 Third lens 18.137 0.436 1.588 61.78 15.09 S6 -17.326 0.430 S7 Fourth lens -12.051 0.290 1.686 31.63 -25.70 S8 -37.852 0.236 S9 Fifth lens 7.286 0.620 1.635 23.96 -61.08 S10 5.939 0.396 S11 Sixth lens 6.699 0.721 1.567 37.40 8.68 S12 -18.265 1.419 S13 Seventh lens 50.356 0.517 1.535 55.74 -5.20 S14 2.636 0.280 S15 Filter Infinity 0.154 1.517 64.20 S16 Infinity 0.547 S17 Imaging surface Infinity

[0209] 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.

[0210] 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.

[0211] The third lens 630 can have positive refractive power, and both the first surface (object side) and the second surface (image side) of the third lens 630 can be convex in the paraxial region.

[0212] The fourth lens 640 can have a negative refractive power, the first surface (object side surface) of the fourth lens 640 can be concave in the paraxial region, and the second surface (image side surface) of the fourth lens 640 can be convex in the paraxial region.

[0213] The fifth lens 650 can have a negative refractive power, the first surface (object side surface) of the fifth lens 650 can be convex in the paraxial region, and the second surface (image side surface) of the fifth lens 650 can be concave in the paraxial region.

[0214] The sixth lens 660 can have a positive refractive power, and both the first surface (object side surface) of the sixth lens 660 and the second surface (image side surface) of the sixth lens 660 can be convex in the paraxial region.

[0215] The seventh lens 670 can have a negative refractive power, the first surface (object side surface) of the seventh lens 670 can be convex in the paraxial region, and the second surface (image side surface) of the seventh lens 670 can be concave in the paraxial region.

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

[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 combined to the second surface (image side surface) of the first lens 610 can be aspherical.

[0218] According to the sixth embodiment, at least one surface of each of the first lens 610 to the seventh lens 670 can be aspherical.

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

[0220] Table 12

[0221]

[0222]

[0223] Seventh Embodiment

[0224] Figure 7A is a configuration diagram illustrating an exemplary optical imaging system according to the seventh embodiment. Figure 7B is a graph representing Figure 7A is a graph representing aberration characteristics of the exemplary optical imaging system shown in FIG. 17.

[0225] 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, a sixth lens 760, and a seventh lens 770. A stop can be disposed between the second lens 720 and the third lens 730.

[0226] In addition, the optical imaging system 700 can include a filter F and an imaging plane IP disposed on an image side of the seventh lens 770. The imaging plane IP can be a portion of an image sensor that receives light.

[0227] The optical imaging system 700 according to the seventh embodiment can have a total focal length of 7.32 mm, an IMGHT of 6.00 mm, and a FOV of 76.13 degrees (°).

[0228] The properties of each lens of the optical imaging system 700 according to the seventh embodiment can have values as shown in Table 13 below.

[0229] Table 13

[0230] Face No. Label Radius of curvature Thickness / distance Refractive index Abbe number Focal length S1 First lens 3.070 1.171 1.565 59.95 7.11 S2 11.066 0.244 S3 Second lens 23.773 0.326 1.710 27.38 -8.41 S4 4.780 0.000 S5 Third lens 4.780 0.522 1.590 72.91 10.44 S6 20.256 0.531 S7 Fourth lens -28.992 0.447 1.702 24.47 -69.14 S8 -71.375 0.489 S9 Fifth lens 8.990 0.386 1.679 32.61 -61.13 S10 7.271 0.520 S11 Sixth lens 9.191 0.899 1.567 37.40 9.13 S12 -11.594 1.461 S13 Seventh lens 63.749 0.497 1.535 55.74 -6.78 S14 3.436 0.297 S15 Filter Infinity 0.163 1.517 64.20 S16 Infinity 0.664 S17 Imaging surface Infinity

[0231] According to the seventh embodiment, the first lens 710 can have a positive refractive power, a first surface (object side surface) of the first lens 710 can be convex in a paraxial region, and a second surface (image side surface) of the first lens 710 can be concave in the paraxial region.

[0232] The second lens 720 can have a negative refractive power, a first surface (object side surface) of the second lens 720 can be convex in a paraxial region, and a second surface (image side surface) of the second lens 720 can be concave in the paraxial region.

[0233] The third lens 730 can have a positive refractive power, a first surface (object side surface) of the third lens 730 can be convex in a paraxial region, and a second surface (image side surface) of the third lens 730 can be concave in the paraxial region.

[0234] The fourth lens 740 can have a negative refractive power, a first surface (object side surface) of the fourth lens 740 can be concave in a paraxial region, and a second surface (image side surface) of the fourth lens 740 can be convex in the paraxial region.

[0235] The fifth lens 750 can have a negative refractive power, a first surface (object side surface) of the fifth lens 750 can be convex in a paraxial region, and a second surface (image side surface) of the fifth lens 750 can be concave in the paraxial region.

[0236] The sixth lens 760 can have a positive refractive power, and both the first surface (object side surface) of the sixth lens 760 and the second surface (image side surface) of the sixth lens 760 can be convex in the paraxial region.

[0237] The seventh lens 770 can have a negative refractive power, the first surface (object side surface) of the seventh lens 770 can be convex in the paraxial region, and the second surface (image side surface) of the seventh lens 770 can be concave in the paraxial region.

[0238] According to the seventh embodiment, the second lens 720 and the third lens 730 can be cemented lenses.

[0239] For example, the second surface (image side surface) of the second lens 720 and the first surface (object side surface) of the third lens 730 bonded to the second surface (image side surface) of the second lens 720 can be spherical.

[0240] According to the seventh embodiment, at least one surface of each of the first lens 710 to the seventh lens 770 can be aspherical.

[0241] The aspherical constant of each lens of the optical imaging system 700 according to the seventh embodiment can have values as shown in Table 14 below.

[0242] Table 14

[0243]

[0244]

[0245] Eighth Embodiment

[0246] Figure 8A is a configuration diagram illustrating an exemplary optical imaging system according to the eighth embodiment. Figure 8B is a graph representing Figure 8A aberration characteristics of the exemplary optical imaging system shown in

[0247] 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, a sixth lens 860, and a seventh lens 870. A stop can be disposed between the second lens 820 and the third lens 830.

[0248] In addition, the optical imaging system 800 can include a filter F disposed on the image side of the seventh lens 870 and an imaging plane IP. The imaging plane IP can be a portion of an image sensor that receives light.

[0249] The optical imaging system 800 according to the eighth embodiment can have a total focal length of 7.27 mm, an IMG HT of 6.00 mm, and a FOV of 76.50 degrees (°).

[0250] The properties of each lens of the optical imaging system 800 according to the eighth embodiment can have values as shown in Table 15 below.

[0251] Table 15

[0252] Face No. Label Radius of curvature Thickness / distance Refractive index Abbe number Focal length S1 First lens 3.070 1.173 1.568 56.55 7.08 S2 11.022 0.243 S3 Second lens 23.492 0.324 1.707 24.55 -8.11 S4 4.619 0.000 S5 Third lens 4.619 0.520 1.590 55.55 9.97 S6 20.222 0.533 S7 Fourth lens -29.152 0.450 1.701 26.92 -69.14 S8 -72.708 0.488 S9 Fifth lens 9.030 0.383 1.676 33.04 -62.25 S10 7.315 0.522 S11 Sixth lens 9.187 0.935 1.567 37.40 9.14 S12 -11.630 1.465 S13 Seventh lens 63.998 0.480 1.535 55.74 -6.69 S14 3.395 0.297 S15 Filter Infinity 0.163 1.517 64.20 S16 Infinity 0.617 S17 Imaging surface Infinity

[0253] 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.

[0254] 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.

[0255] The third lens 830 can have a positive refractive power, the first surface (object side surface) of the third lens 830 can be convex in the paraxial region, and the second surface (image side surface) of the third lens 830 can be concave in the paraxial region.

[0256] 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.

[0257] The fifth lens 850 can have a negative refractive power, the first surface (object side surface) of the fifth lens 850 can be convex in the paraxial region, and the second surface (image side surface) of the fifth lens 850 can be concave in the paraxial region.

[0258] The sixth lens 860 can have a positive refractive power, and both the first surface (object side surface) of the sixth lens 860 and the second surface (image side surface) of the sixth lens 860 can be convex in the paraxial region.

[0259] The seventh lens 870 can have a negative refractive power, the first surface (object side surface) of the seventh lens 870 can be convex in the paraxial region, and the second surface (image side surface) of the seventh lens 870 can be concave in the paraxial region.

[0260] According to the eighth embodiment, the second lens 820 and the third lens 830 can be cemented lenses.

[0261] For example, the second surface (image side surface) of the second lens 820 and the first surface (object side surface) of the third lens 830 combined to the second surface (image side surface) of the second lens 820 can be aspherical.

[0262] According to the eighth embodiment, at least one surface of each of the first lens 810 to the seventh lens 870 can be aspherical.

[0263] The aspherical constant of each lens of the optical imaging system 800 according to the eighth embodiment can have values as shown in Table 16 below.

[0264] Table 16

[0265]

[0266]

[0267] Finally, the conditional expression data according to the embodiment can have values as shown in Table 17 below.

[0268] Table 17

[0269]

[0270]

[0271] According to the foregoing embodiments, the optical imaging system can obtain a high-resolution image by reducing the total optical length and improving chromatic aberration.

[0272] While the present disclosure includes specific examples, it will be apparent to those skilled in the art after understanding the disclosure provided herein that various changes in form and details can 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 to be descriptive in nature and not limiting in purpose. Descriptions of features or aspects in each example are to be considered as applicable to similar features or aspects in other examples. Proper results can be achieved if the described techniques are performed in a different order, and / or if components in the described systems, architectures, devices, or circuits are combined or substituted for one another or are supplemented, regardless of whether a proper result is achieved.

[0273] Accordingly, in addition to the disclosure set forth above and in all of the drawings, the scope of the disclosure encompasses all changes, alterations and modifications of the embodiments and their equivalents that fall within the true spirit and scope of the claims and their equivalents, i.e., all modifications and variations that would be or become apparent to the skilled artisan in light of the disclosure herein.

Claims

1. An optical imaging system, characterized by, 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 refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power, wherein the first lens to the seventh lens are sequentially arranged from an object side, wherein the first lens to the seventh lens include a cemented lens formed by combining adjacent surfaces of two lenses arranged adjacent to each other, and wherein the two lenses forming the cemented lens have opposite refractive powers.

2. The optical imaging system of claim 1, wherein, The first lens and the second lens or the second lens and the third lens are arranged as the cemented lens.

3. The optical imaging system of claim 1, wherein, The cemented lens satisfies a conditional expression: 0 < |fa / Va-fb / Vb| < 2, wherein fa and Va are a focal length and an Abbe number of a lens arranged on an object side among the two lenses combined with each other, and fb and Vb are a focal length and an Abbe number of a lens arranged on an image side among the two lenses combined with each other.

4. The optical imaging system of claim 1, wherein, The third lens has a convex object side surface in a paraxial region.

5. The optical imaging system of claim 1, wherein, The fourth lens has a concave object side surface in a paraxial region.

6. The optical imaging system of claim 1, wherein, An object side surface of the sixth lens and an image side surface of the sixth lens are both convex in a paraxial region.

7. The optical imaging system of claim 1, wherein, The seventh lens has a convex object side surface in a paraxial region.

8. The optical imaging system of claim 1, wherein, A conditional expression: 1.0 < TTL / f < 1.3 is satisfied, wherein TTL is a distance from an object side surface of the first lens to an image plane on an optical axis, and f is a total focal length of the optical imaging system.

9. The optical imaging system of claim 1, wherein, The fifth lens has negative refractive power.

10. An optical imaging system characterized by, The optical imaging system includes: a first lens, a second lens, a third lens having positive refractive power, a fourth lens having negative refractive power and a convex object side surface, a fifth lens having refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power, wherein the first lens to the seventh lens are sequentially arranged from an object side, and wherein a conditional expression: 0.5 < TTL / (2 x IMG HT) < 0.8 is satisfied, wherein TTL is a distance from an object side surface of the first lens to an image plane on an optical axis, and IMG HT is half of a diagonal length of the image plane.

11. The optical imaging system of claim 10, wherein, A conditional expression: 5 < |f5 / f| < 10 is satisfied, wherein f5 is a focal length of the fifth lens, and f is a total focal length of the optical imaging system.

12. The optical imaging system of claim 10, wherein, A conditional expression: 0.5 < f6 / f < 3 is satisfied, wherein f6 is a focal length of the sixth lens, and f is a total focal length of the optical imaging system.

13. The optical imaging system of claim 10, wherein, A conditional expression: 1 < f3 / f < 3 is satisfied, wherein f3 is a focal length of the third lens, and f is a total focal length of the optical imaging system.

14. The optical imaging system of claim 10, wherein, The third lens has a convex object side surface in a paraxial region.

15. The optical imaging system of claim 10, wherein, An object side surface of the second lens is combined to an image side surface of the first lens, or an image side surface of the second lens is combined to an object side surface of the third lens.

16. The optical imaging system of claim 10, wherein, The first lens has positive refractive power, and the second lens has negative refractive power.

17. An optical imaging system characterized by, The optical imaging system includes: a first lens, a second lens, a third lens having positive refractive power, a fourth lens having negative refractive power and a convex object side surface, a fifth lens having refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power, wherein the first lens to the seventh lens are sequentially arranged from an object side, and wherein a condition expression: -10 < f4 / f < -1 is satisfied, wherein f4 is a focal length of the fourth lens, and f is a total focal length of the optical imaging system.

Images