Optical image capturing system

Abstract

The utility model relates to an optical imaging system. The optical image capturing system includes a first lens having a negative refractive power, a second lens, a third lens having a convex image-side surface, a fourth lens, a fifth lens having a negative refractive power, a sixth lens having a positive refractive power, and a seventh lens having a convex object-side surface. The first to seventh lenses are sequentially arranged from the object side and satisfy TTL / IMG HTlt; 1.2, where TTL is the distance on the optical axis from the object side of the first lens to the image plane, and IMG HT is the height of the image plane.

Description

[0001] Cross - reference to related applications

[0002] This application claims priority to Korean Patent Application No. 10 - 2023 - 0086727, filed with the Korean Intellectual Property Office on July 4, 2023, the entire disclosure of which is incorporated herein by reference for all purposes. Technical field

[0003] This disclosure relates to an optical imaging system. Background art

[0004] A portable terminal may include a wide - angle camera with a short focal length and a telephoto camera with a long focal length to provide images with various magnifications.

[0005] Large image sensors may be developed for high pixel counts, and an optical system with a low Fno value may be desired to obtain a bright image even when shooting under low - light conditions.

[0006] The above information is presented as background information only to assist in understanding this disclosure. No determination has been made, and no assertion is made, as to whether any of the above constitutes prior art with respect to this disclosure. Summary of the utility model

[0007] The summary of the utility model is provided to introduce a selection of concepts in a simplified form, which are further described in the detailed description below. The summary of the utility model is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to assist in determining the scope of the claimed subject matter.

[0008] In one general aspect, an optical imaging system includes a first lens having a negative refractive power, a second lens, a third lens having a convex image - side surface, a fourth lens, a fifth lens having a negative refractive power, a sixth lens having a positive refractive power, and a seventh lens having a convex object - side surface. The first lens to the seventh lens are sequentially arranged from the object side and satisfy TTL / IMGHT < 1.2, where TTL is the distance on the optical axis from the object - side surface of the first lens to the image plane, and IMG HT is the height of the image plane.

[0009] The second lens may have a positive refractive power, and the image - side surface of the second lens may be concave.

[0010] The object - side surface of the sixth lens may be concave.

[0011] It may satisfy 50 < FOV / f, where FOV is the field of view of the optical imaging system and f is the focal length of the optical imaging system.

[0012] It can satisfy f / EPD < 1.8, where f is the focal length of the optical imaging system and EPD is the diameter of the entrance pupil.

[0013] It can satisfy L6R1 / CT6 < -3, where L6R1 is the radius of curvature of the object side surface of the sixth lens and CT6 is the central thickness of the sixth lens.

[0014] It can satisfy 15 < v1 - v2 < 40 and 0 < v1 - v5 < 45, where v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, and v5 is the Abbe number of the fifth lens.

[0015] It can satisfy 1.6 < ET1 / CT1, where ET1 is the edge thickness of the first lens and CT1 is the central thickness of the first lens.

[0016] The object side surface of the first lens can be concave, and the fourth lens can have a positive refractive power.

[0017] The image side surface of the fifth lens can be concave, and the seventh lens can have a negative refractive power.

[0018] In another general aspect, the optical imaging system includes a first lens, a second lens, a third lens with a positive refractive power, a fourth lens with a positive refractive power, a fifth lens, a sixth lens with a concave object side surface, and a seventh lens with a convex object side surface. Both the object side surface and the image side surface of the first lens are concave. The first lens to the seventh lens can be arranged in sequence from the object side. Any one surface or any combination of any two or more surfaces of the first lens and the seventh lens can include one or more anaclastic points, and it can satisfy f / EPD < 1.8, where f is the focal length of the optical imaging system and EPD is the diameter of the entrance pupil.

[0019] It can satisfy SD6 / SD14 < 0.5, where SD6 is the effective diameter of the image side surface of the third lens and SD14 is the effective diameter of the image side surface of the seventh lens.

[0020] The first lens can have a negative refractive power, and it can satisfy -4 < f1 / f < 0, where f1 is the focal length of the first lens.

[0021] The image side surface of the fifth lens can be convex, and the seventh lens can have a positive refractive power.

[0022] The image side surface of the fifth lens can be concave, and the seventh lens can have a negative refractive power.

[0023] It can satisfy TTL / IMG HT < 1.2, where TTL is the distance on the optical axis from the object side surface of the first lens to the image plane, and IMG HT is the height of the image plane.

[0024] Other features and aspects will be apparent from the following detailed description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a configuration diagram of an optical imaging system according to a first embodiment of the present disclosure.

[0026] Figure 2 It is shown Figure 1 Graph of the aberration characteristics of the optical imaging system shown in .

[0027] Figure 3 is a configuration diagram of an optical imaging system according to a second embodiment of the present disclosure.

[0028] Figure 4 It is shown Figure 3 Graph of the aberration characteristics of the optical imaging system shown in .

[0029] Figure 5 is a configuration diagram of an optical imaging system according to a third embodiment of the present disclosure.

[0030] Figure 6 It is shown Figure 5 Graph of the aberration characteristics of the optical imaging system shown in .

[0031] Figure 7 is a configuration diagram of an optical imaging system according to a fourth embodiment of the present disclosure.

[0032] Figure 8 It is shown Figure 7 Graph of the aberration characteristics of the optical imaging system shown in .

[0033] Fig. 9 is a configuration diagram of an optical imaging system according to a fifth embodiment of the present disclosure.

[0034] Fig.10 It is shown Fig. 9 Graph of the aberration characteristics of the optical imaging system shown in .

[0035] Fig.11 is a configuration diagram of an optical imaging system according to a sixth embodiment of the present disclosure.

[0036] Fig.12 It is shown Fig.11 Graph of the aberration characteristics of the optical imaging system shown in .

[0037] Fig.13 is a configuration diagram of an optical imaging system according to a seventh embodiment of the present disclosure.

[0038] Fig.14 It is shown Fig.13 Graph of the aberration characteristics of the optical imaging system shown in .

[0039] Fig.15 is a configuration diagram of an optical imaging system according to an eighth embodiment of the present disclosure.

[0040] Fig.16 It is shown Fig.15 Graph of the aberration characteristics of the optical imaging system shown in .

[0041] Throughout the drawings and detailed description, unless otherwise described, the same reference numerals refer to the same elements. For clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative sizes, proportions, and descriptions of the elements in the drawings may be exaggerated. DETAILED DESCRIPTION

[0042] Hereinafter, although examples of the present disclosure will be described in detail with reference to the accompanying drawings, it should be noted that the examples are not limited thereto.

[0043] The following specific embodiments are provided to help the reader gain a comprehensive understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent after understanding the present disclosure. For example, the order of operations described herein is merely an example and is not limited to the order set forth herein, but may be changed as will be apparent after understanding the present disclosure, except for operations that must occur in a certain order. In addition, descriptions of features known in the art may be omitted for clarity and brevity.

[0044] The features described herein may be implemented in different forms and are not to be construed as being limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent after understanding the present disclosure.

[0045] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, or “coupled to” another element, it may be directly “on”, directly “connected to”, or directly “coupled to” the other element, or one or more other elements may be present between them. Conversely, when an element is described as being “directly” “on”, “directly connected to”, or “directly coupled to” another element, there are no other elements present between them.

[0046] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more of the associated listed items; similarly, "at least one of..." includes any one of the associated listed items and any combination of any two or more of the associated listed items.

[0047] Although terms such as "first", "second", and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Instead, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, the first member, first component, first region, first layer, or first portion mentioned in the examples described herein may also be referred to as the second member, second component, second region, second layer, or second portion without departing from the teachings of the examples.

[0048] For ease of description, spatially relative terms such as "above", "upper", "below", "lower", etc. may be used herein to describe the relationship of one element to another element as shown in the drawings. In addition to the orientation depicted in the drawings, such spatially relative terms are intended to also include different orientations of the device in use or operation. For example, if the device in the drawings is turned over, an element described as being "above" or "upper" relative to another element will then be "below" or "lower" relative to the other element. Therefore, the term "above" includes both the orientation of the above and below, depending on the spatial orientation of the device. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein will be interpreted accordingly.

[0049] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. The words "a", "an" and "the" are intended to include plural forms as well, unless the context clearly indicates otherwise. The terms "include", "comprises" and "have" specify the presence of stated features, quantities, operations, components, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements and / or combinations thereof.

[0050] Due to manufacturing techniques and / or tolerances, the shapes shown in the drawings may vary. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include shape variations that occur during manufacturing.

[0051] Herein, it is noted that the use of the term “may” with respect to an example, such as with respect to what an example may include or implement, means that there is at least one example that includes or implements this feature, and all examples are not limited thereto.

[0052] As will be apparent after understanding the present disclosure, the features of the examples described herein may be combined in various ways. In addition, although the examples described herein have multiple configurations, other configurations are also possible, as will be apparent after understanding the present disclosure.

[0053] In this specification, in the description of the lens shape, a configuration in which one surface is convex means that the paraxial region (or paraxial portion) of the surface is convex, and a configuration in which one surface is concave means that the paraxial region of the surface is concave. Therefore, even when one surface of a lens is described as convex, the edge of the lens may be concave. Similarly, even when one surface of a lens is described as concave, the edge of the lens may be convex.

[0054] According to the present disclosure, the optical imaging system may include seven lenses arranged along the optical axis. For example, the optical imaging system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, which may be arranged in sequence from the object side along the optical axis. According to the present disclosure, in the optical imaging system, the first lens refers to the lens closest to the object (or the photographed subject), and the seventh lens refers to the lens closest to the image sensor.

[0055] According to the present disclosure, an optical imaging system may include an image sensor for converting light passing through a lens into an electrical signal and an infrared (IR) cut-off filter for blocking light in an infrared region of the light passing through the lens. The image sensor may include an image plane on which an image of an object is formed, and the infrared cut-off filter may be disposed between a lens that is most adjacent to the image sensor and the image sensor.

[0056] According to the present disclosure, the optical imaging system may include an aperture stop for adjusting the amount of light. For example, the optical imaging system may include an aperture stop between the second lens and the third lens.

[0057] According to the present disclosure, the optical imaging system may include a lens formed of a plastic material. For example, at least one of the first to seventh lenses may be a lens formed of a plastic material, and preferably, all of the first to seventh lenses may be lenses formed of a plastic material. In addition, at least some of the first to seventh lenses may be formed of different plastic materials having different refractive indices and / or Abbe numbers.

[0058] According to the present disclosure, the optical imaging system may include an aspherical lens. For example, at least one of the first lens to the seventh lens may have an aspherical surface, for example, at least one of its object side surface and image side surface may be an aspherical surface. The aspherical surfaces of the first lens to the seventh lens may be represented by the following formula 1.

[0059] [Formula 1]

[0060]

[0061] In Formula 1, c is the reciprocal of the curvature radius of the lens, K is the conic constant, Y is the distance from any point on the aspherical surface of the lens to the optical axis, A to H, J, and L to P are the aspherical coefficients from the 4th order to the 30th order in sequence, and Z is the distance from any point on the aspherical surface to the vertex of the corresponding aspherical surface in the optical axis direction.

[0062] In addition, according to the present disclosure, the optical imaging system may satisfy at least one of the following conditional expressions.

[0063] [Conditional Expression 1] -4 < f1 / f < 0

[0064] [Conditional Expression 2] f / EPD < 1.8

[0065] [Conditional Expression 3] 15 < v1 - v2 < 40

[0066] [Conditional Expression 4] 0 < v1 - v5 < 45

[0067] [Conditional Expression 5] 0 < v1 - v7 < 40

[0068] [Conditional Expression 6] TTL / IMG HT < 1.2

[0069] [Conditional Expression 7] 50 < FOV / f (unit: °·mm -1 )

[0070] [Conditional Expression 8] L6R1 / CT6 < -3

[0071] [Conditional Expression 9] 1.6 < ET1 / CT1

[0072] [Conditional Expression 10] 2.5 < SD1 / SD5 < 4

[0073] [Conditional Expression 11] SD6 / SD14 < 0.5

[0074] In [Conditional Expression 1], f1 is the focal length of the first lens, and f is the focal length of the optical imaging system. Only when the range according to [Conditional Expression 1] is satisfied, a wide field of view (a field of view applicable to an ultra-wide-angle lens) can be ensured.

[0075] In [Conditional Expression 2], f is the focal length of the optical imaging system, and EPD is the diameter of the entrance pupil. [Conditional Expression 2] shows the conditional formula (F value) that defines the brightness of the optical imaging system, and only when the range according to [Conditional Expression 2] is satisfied, a desired bright optical system can be achieved.

[0076] In [Conditional Expression 3] to [Conditional Expression 5], v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, v5 is the Abbe number of the fifth lens, and v7 is the Abbe number of the seventh lens. Only when the ranges according to [Conditional Expression 3] to [Conditional Expression 5] are satisfied, chromatic aberration can be minimized.

[0077] In [Conditional Expression 6], TTL is the distance from the object side surface of the first lens to the image plane on the optical axis, and IMG HT is the height of the image plane (half the diagonal length). Only when the range according to [Conditional Expression 6] is satisfied, miniaturization can be achieved.

[0078] In [Conditional Expression 7], FOV is the field of view of the optical imaging system, and f is the focal length of the optical imaging system. Only when the range according to [Conditional Expression 7] is satisfied, the purpose of the wide-angle lens can be achieved.

[0079] In [Conditional Expression 8], L6R1 is the curvature radius of the object-side surface of the sixth lens, and CT6 is the center thickness of the sixth lens. When it exceeds the range according to [Conditional Expression 8], it becomes difficult to correct the light blur phenomenon.

[0080] In [Conditional Expression 9], ET1 is the edge thickness of the first lens, and CT1 is the center thickness of the first lens. When the range according to [Conditional Expression 9] is exceeded, it becomes difficult to ensure the ambient light ratio and correct aberrations.

[0081] In [Conditional Expression 10], SD1 is an effective diameter of the object side surface of the first lens, and SD5 is an effective diameter of the object side surface of the third lens. When the range according to [Conditional Expression 10] is exceeded, it becomes difficult to achieve a wide field of view.

[0082] In [Conditional Expression 11], SD6 is an effective diameter of the image side surface of the third lens, and SD14 is an effective diameter of the image side surface of the seventh lens. When the range according to [Conditional Expression 11] is exceeded, it becomes difficult to achieve high resolution.

[0083] Hereinafter, various embodiments of the optical imaging system according to the present disclosure will be described.

[0084] First embodiment

[0085] Figure 1 is a configuration diagram of an optical imaging system according to a first embodiment of the present disclosure, and Figure 2 It is shown Figure 1 Graph of the aberration characteristics of the optical imaging system shown in .

[0086] The optical imaging system 100 according to the first embodiment of the present disclosure 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 .

[0087] The first lens 110 may have negative refractive power, and both the object-side surface and the image-side surface of the first lens 110 may be concave. In addition, the object-side surface of the first lens 110 may include at least one inflection point. That is, the object-side surface of the first lens 110 may be concave in the paraxial portion, but may be convex in the edge portion. The second lens 120 may have positive refractive power, the object-side surface of the second lens 120 may be convex, and the image-side surface of the second lens 120 may be concave. The third lens 130 may have positive refractive power, and both the object-side surface and the image-side surface of the third lens 130 may be convex. The fourth lens 140 may have positive refractive power, and both the object-side surface and the image-side surface of the fourth lens 140 may be convex. The fifth lens 150 may have negative refractive power, the object-side surface of the fifth lens 150 may be concave, and the image-side surface of the fifth lens 150 may be convex. The sixth lens 160 may have positive refractive power, the object-side surface of the sixth lens 160 may be concave, and the image-side surface of the sixth lens 160 may be convex. The seventh lens 170 may have positive refractive power, the object-side surface of the seventh lens 170 may be convex, and the image-side surface of the seventh lens 170 may be concave. In addition, each of the object-side surface and the image-side surface of the seventh lens 170 may include at least one inflection point. That is, the object-side surface of the seventh lens 170 may be convex in the paraxial portion but may be concave in the edge portion, and the image-side surface of the seventh lens 170 may be concave in the paraxial portion but may be convex in the edge portion.

[0088] The optical imaging system 100 according to the first embodiment of the present disclosure may include the infrared cut filter 180 and the image sensor 190 after the seventh lens 170 , and may further include a stop between the second lens 120 and the third lens 130 .

[0089] Table 1 shows the characteristics of the optical imaging system 100 according to the first embodiment of the present disclosure. The optical imaging system 100 according to the first embodiment of the present disclosure has a focal length of 2.0 mm, a field of view of 125.0 degrees, a height of an image plane of 7.0 mm, and an F value of 1.7.

[0090] [Table 1]

[0091]

[0092]

[0093] Table 2 shows the aspheric surface values ​​of the optical imaging system 100 according to the first embodiment of the present disclosure.

[0094] [Table 2]

[0095]

[0096]

[0097] Second embodiment

[0098] Figure 3 is a configuration diagram of an optical imaging system according to a second embodiment of the present disclosure, and Figure 4 It is shown Figure 3 Graph of the aberration characteristics of the optical imaging system shown in .

[0099] The optical imaging system 200 according to the second embodiment of the present disclosure may 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 .

[0100] The first lens 210 may have negative refractive power, and both the object side surface and the image side surface of the first lens 210 may be concave. In addition, the object side surface of the first lens 210 may include at least one inflection point. That is, the object side surface of the first lens 210 may be concave in the paraxial portion, but may be convex in the edge portion. The second lens 220 may have positive refractive power, the object side surface of the second lens 220 may be convex, and the image side surface of the second lens 220 may be concave. The third lens 230 may have positive refractive power, and both the object side surface and the image side surface of the third lens 230 may be convex. The fourth lens 240 may have positive refractive power, and both the object side surface and the image side surface of the fourth lens 240 may be convex. The fifth lens 250 may have negative refractive power, and both the object side surface and the image side surface of the fifth lens 250 may be concave. In addition, the image side surface of the fifth lens 250 may include at least one inflection point. That is, the image side surface of the fifth lens 250 may be concave in the paraxial portion, but may be convex in the edge portion. The sixth lens 260 may have positive refractive power, the object side surface of the sixth lens 260 may be concave, and the image side surface of the sixth lens 260 may be convex. The seventh lens 270 may have negative refractive power, the object side surface of the seventh lens 270 may be convex, and the image side surface of the seventh lens 270 may be concave. In addition, each of the object side surface and the image side surface of the seventh lens 270 may include at least one inflection point. That is, the object side surface of the seventh lens 270 may be convex in the paraxial portion, but may be concave in the edge portion, and the image side surface of the seventh lens 270 may be concave in the paraxial portion, but may be convex in the edge portion.

[0101] The optical imaging system 200 according to the second embodiment of the present disclosure may include an infrared cut filter 280 and an image sensor 290 after the seventh lens 270 , and may further include a stop between the second lens 220 and the third lens 230 .

[0102] Table 3 shows the characteristics of the optical imaging system 200 according to the second embodiment of the present disclosure. The optical imaging system 200 according to the second embodiment of the present disclosure has a focal length of 2.0 mm, a field of view of 125.0 degrees, a height of an image plane of 7.0 mm, and an F value of 1.7.

[0103] [Table 3]

[0104]

[0105]

[0106] Table 4 shows aspheric surface values ​​of the optical imaging system 200 according to the second embodiment of the present disclosure.

[0107] [Table 4]

[0108]

[0109]

[0110]

[0111] Third embodiment

[0112] Figure 5 is a configuration diagram of an optical imaging system according to a third embodiment of the present disclosure, and Figure 6 It is shown Figure 5 Graph of the aberration characteristics of the optical imaging system shown in .

[0113] The optical imaging system 300 according to the third embodiment of the present disclosure may 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 .

[0114] The first lens 310 may have a negative refractive power, and both the object side surface and the image side surface of the first lens 310 may be concave. In addition, the object side surface of the first lens 310 may include at least one inflection point. That is, the object side surface of the first lens 310 may be concave in the paraxial portion, but may be convex in the edge portion. The second lens 320 may have a positive refractive power, the object side surface of the second lens 320 may be convex, and the image side surface of the second lens 320 may be concave. The third lens 330 may have a positive refractive power, and both the object side surface and the image side surface of the third lens 330 may be convex. The fourth lens 340 may have a positive refractive power, and both the object side surface and the image side surface of the fourth lens 340 may be convex. The fifth lens 350 may have a negative refractive power, and both the object side surface and the image side surface of the fifth lens 350 may be concave. In addition, the image side surface of the fifth lens 350 may include at least one inflection point. That is, the image side surface of the fifth lens 350 may be concave in the paraxial portion, but may be convex in the edge portion. The sixth lens 360 may have positive refractive power, the object side surface of the sixth lens 360 may be concave, and the image side surface of the sixth lens 360 may be convex. The seventh lens 370 may have negative refractive power, the object side surface of the seventh lens 370 may be convex, and the image side surface of the seventh lens 370 may be concave. In addition, each of the object side surface and the image side surface of the seventh lens 370 may include at least one inflection point. That is, the object side surface of the seventh lens 370 may be convex in the paraxial portion, but may be concave in the edge portion, and the image side surface of the seventh lens 370 may be concave in the paraxial portion, but may be convex in the edge portion.

[0115] The optical imaging system 300 according to the third embodiment of the present disclosure may include an infrared cut filter 380 and an image sensor 390 after the seventh lens 370 , and may further include a stop between the second lens 320 and the third lens 330 .

[0116] Table 5 shows the characteristics of the optical imaging system 300 according to the third embodiment of the present disclosure. The optical imaging system 300 according to the third embodiment of the present disclosure has a focal length of 2.0 mm, a field of view of 125.2 degrees, a height of an image plane of 7.0 mm, and an F value of 1.7.

[0117] [Table 5]

[0118]

[0119]

[0120] Table 6 is a table showing aspherical surface values ​​of the optical imaging system 300 according to the third embodiment of the present disclosure.

[0121] [Table 6]

[0122]

[0123]

[0124] Fourth embodiment

[0125] Figure 7 is a configuration diagram of an optical imaging system according to a fourth embodiment of the present disclosure, and Figure 8 It is shown Figure 7 Graph of the aberration characteristics of the optical imaging system shown in .

[0126] The optical imaging system 400 according to the fourth embodiment of the present disclosure may 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 .

[0127] The first lens 410 may have a negative refractive power, and both the object side surface and the image side surface of the first lens 410 may be concave. In addition, the object side surface of the first lens 410 may include at least one inflection point. That is, the object side surface of the first lens 410 may be concave in the paraxial portion, but may be convex in the edge portion. The second lens 420 may have a positive refractive power, the object side surface of the second lens 420 may be convex, and the image side surface of the second lens 420 may be concave. The third lens 430 may have a positive refractive power, and both the object side surface and the image side surface of the third lens 430 may be convex. The fourth lens 440 may have a positive refractive power, and both the object side surface and the image side surface of the fourth lens 440 may be convex. The fifth lens 450 may have a negative refractive power, and both the object side surface and the image side surface of the fifth lens 450 may be concave. In addition, the image side surface of the fifth lens 450 may include at least one inflection point. That is, the image side surface of the fifth lens 450 may be concave in the paraxial portion, but may be convex in the edge portion. The sixth lens 460 may have positive refractive power, the object side surface of the sixth lens 460 may be concave, and the image side surface of the sixth lens 460 may be convex. The seventh lens 470 may have negative refractive power, the object side surface of the seventh lens 470 may be convex, and the image side surface of the seventh lens 470 may be concave. In addition, each of the object side surface and the image side surface of the seventh lens 470 may include at least one inflection point. That is, the object side surface of the seventh lens 470 may be convex in the paraxial portion, but may be concave in the edge portion, and the image side surface of the seventh lens 470 may be concave in the paraxial portion, but may be convex in the edge portion.

[0128] The optical imaging system 400 according to the fourth embodiment of the present disclosure may include an infrared cut filter 480 and an image sensor 490 after the seventh lens 470 , and may further include a stop between the second lens 420 and the third lens 430 .

[0129] Table 7 shows the characteristics of the optical imaging system 400 according to the fourth embodiment of the present disclosure. The optical imaging system 400 according to the fourth embodiment of the present disclosure has a focal length of 2.0 mm, a field of view of 125.0 degrees, a height of an image plane of 7.0 mm, and an F value of 1.7.

[0130] [Table 7]

[0131]

[0132]

[0133] Table 8 is a table showing aspherical surface values ​​of the optical imaging system 400 according to the fourth embodiment of the present disclosure.

[0134] [Table 8]

[0135]

[0136]

[0137] Fifth embodiment

[0138] Fig. 9 is a configuration diagram of an optical imaging system according to a fifth embodiment of the present disclosure, and Fig.10 It is shown Fig. 9 Graph of the aberration characteristics of the optical imaging system shown in .

[0139] The optical imaging system 500 according to the fifth embodiment of the present disclosure may 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 .

[0140] The first lens 510 may have a negative refractive power, and both the object side surface and the image side surface of the first lens 510 may be concave. In addition, the object side surface of the first lens 510 may include at least one inflection point. That is, the object side surface of the first lens 510 may be concave in the paraxial portion, but may be convex in the edge portion. The second lens 520 may have a positive refractive power, the object side surface of the second lens 520 may be convex, and the image side surface of the second lens 520 may be concave. The third lens 530 may have a positive refractive power, and both the object side surface and the image side surface of the third lens 530 may be convex. The fourth lens 540 may have a positive refractive power, and both the object side surface and the image side surface of the fourth lens 540 may be convex. The fifth lens 550 may have a negative refractive power, and both the object side surface and the image side surface of the fifth lens 550 may be concave. In addition, the image side surface of the fifth lens 550 may include at least one inflection point. That is, the image side surface of the fifth lens 550 may be concave in the paraxial portion, but may be convex in the edge portion. The sixth lens 560 may have positive refractive power, the object side surface of the sixth lens 560 may be concave, and the image side surface of the sixth lens 560 may be convex. The seventh lens 570 may have negative refractive power, the object side surface of the seventh lens 570 may be convex, and the image side surface of the seventh lens 570 may be concave. In addition, each of the object side surface and the image side surface of the seventh lens 570 may include at least one inflection point. That is, the object side surface of the seventh lens 570 may be convex in the paraxial portion, but may be concave in the edge portion, and the image side surface of the seventh lens 570 may be concave in the paraxial portion, but may be convex in the edge portion.

[0141] The optical imaging system 500 according to the fifth embodiment of the present disclosure may include an infrared cut filter 580 and an image sensor 590 after the seventh lens 570 , and may further include a stop between the second lens 520 and the third lens 530 .

[0142] Table 9 shows the characteristics of the optical imaging system 500 according to the fifth embodiment of the present disclosure. The optical imaging system 500 according to the fifth embodiment of the present disclosure has a focal length of 2.0 mm, a field of view of 125.2 degrees, a height of an image plane of 7.0 mm, and an F value of 1.7.

[0143] [Table 9]

[0144]

[0145]

[0146] Table 10 is a table showing aspherical surface values ​​of the optical imaging system 500 according to the fifth embodiment of the present disclosure.

[0147] [Table 10]

[0148]

[0149]

[0150]

[0151] Sixth Embodiment

[0152] Fig.11 is a configuration diagram of an optical imaging system according to a sixth embodiment of the present disclosure, and Fig.12 It is shown Fig.11 Graph of the aberration characteristics of the optical imaging system shown in .

[0153] The optical imaging system 600 according to the sixth embodiment of the present disclosure 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 .

[0154] The first lens 610 may have a negative refractive power, and both the object side surface and the image side surface of the first lens 610 may be concave. In addition, the object side surface of the first lens 610 may include at least one inflection point. That is, the object side surface of the first lens 610 may be concave in the paraxial portion, but may be convex in the edge portion. The second lens 620 may have a positive refractive power, the object side surface of the second lens 620 may be convex, and the image side surface of the second lens 620 may be concave. The third lens 630 may have a positive refractive power, and both the object side surface and the image side surface of the third lens 630 may be convex. The fourth lens 640 may have a positive refractive power, and the object side surface of the fourth lens 640 may be concave, and the image side surface of the fourth lens 640 may be convex. The fifth lens 650 may have a negative refractive power, and both the object side surface and the image side surface of the fifth lens 650 may be concave. In addition, the image side surface of the fifth lens 650 may include at least one inflection point. That is, the image side surface of the fifth lens 650 may be concave in the paraxial portion, but may be convex in the edge portion. The sixth lens 660 may have positive refractive power, the object side surface of the sixth lens 660 may be concave, and the image side surface of the sixth lens 660 may be convex. The seventh lens 670 may have negative refractive power, the object side surface of the seventh lens 670 may be convex, and the image side surface of the seventh lens 670 may be concave. In addition, each of the object side surface and the image side surface of the seventh lens 670 may include at least one inflection point. That is, the object side surface of the seventh lens 670 may be convex in the paraxial portion, but may be concave in the edge portion, and the image side surface of the seventh lens 670 may be concave in the paraxial portion, but may be convex in the edge portion.

[0155] The optical imaging system 600 according to the sixth embodiment of the present disclosure may include an infrared cut filter 680 and an image sensor 690 after the seventh lens 670 , and may further include a stop between the second lens 620 and the third lens 630 .

[0156] Table 11 shows the characteristics of the optical imaging system 600 according to the sixth embodiment of the present disclosure. The optical imaging system 600 according to the sixth embodiment of the present disclosure has a focal length of 1.9 mm, a field of view of 124.5 degrees, a height of an image plane of 7.0 mm, and an F value of 1.7.

[0157] [Table 11]

[0158]

[0159]

[0160] Table 12 shows aspherical surface values ​​of the optical imaging system 600 according to the sixth embodiment of the present disclosure.

[0161] [Table 12]

[0162]

[0163]

[0164] Seventh embodiment

[0165] Fig.13 is a configuration diagram of an optical imaging system according to a seventh embodiment of the present disclosure, and Fig.14 It is shown Fig.13 Graph of the aberration characteristics of the optical imaging system shown in .

[0166] The optical imaging system 700 according to the seventh embodiment of the present disclosure may 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 .

[0167] The first lens 710 may have a negative refractive power, and both the object side surface and the image side surface of the first lens 710 may be concave. In addition, the object side surface of the first lens 710 may include at least one inflection point. That is, the object side surface of the first lens 710 may be concave in the paraxial region, but may be convex in the edge portion. The second lens 720 may have a positive refractive power, the object side surface of the second lens 720 may be convex, and the image side surface of the second lens 720 may be concave. The third lens 730 may have a positive refractive power, and both the object side surface and the image side surface of the third lens 730 may be convex. The fourth lens 740 may have a positive refractive power, and both the object side surface and the image side surface of the fourth lens 740 may be convex. The fifth lens 750 may have a negative refractive power, and both the object side surface and the image side surface of the fifth lens 750 may be concave. In addition, the image side surface of the fifth lens 750 may include at least one inflection point. That is, the image side surface of the fifth lens 750 may be concave in the paraxial region, but may be convex in the edge portion. The sixth lens 760 may have positive refractive power, the object side surface of the sixth lens 760 may be concave, and the image side surface of the sixth lens 760 may be convex. The seventh lens 770 may have negative refractive power, the object side surface of the seventh lens 770 may be convex, and the image side surface of the seventh lens 770 may be concave. In addition, each of the object side surface and the image side surface of the seventh lens 770 may include at least one inflection point. That is, the object side surface of the seventh lens 770 may be convex in the paraxial portion, but may be concave in the edge portion, and the image side surface of the seventh lens 770 may be concave in the paraxial portion, but may be convex in the edge portion.

[0168] The optical imaging system 700 according to the seventh embodiment of the present disclosure may include an infrared cut filter 780 and an image sensor 790 after the seventh lens 770 , and may further include a stop between the second lens 720 and the third lens 730 .

[0169] Table 13 shows the characteristics of the optical imaging system 700 according to the seventh embodiment of the present disclosure. The optical imaging system 700 according to the seventh embodiment of the present disclosure has a focal length of 2.0 mm, a field of view of 124.1 degrees, a height of an image plane of 7.0 mm, and an F value of 1.7.

[0170] [Table 13]

[0171]

[0172]

[0173] Table 14 shows aspherical surface values ​​of the optical imaging system 700 according to the seventh embodiment of the present disclosure.

[0174] [Table 14]

[0175]

[0176]

[0177] Eighth Embodiment

[0178] Fig.15 is a configuration diagram of an optical imaging system according to an eighth embodiment of the present disclosure. Fig.16 It is shown Fig.15 Graph of the aberration characteristics of the optical imaging system shown in .

[0179] The optical imaging system 800 according to the eighth embodiment of the present disclosure may 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 .

[0180] The first lens 810 may have a negative refractive power, and both the object side surface and the image side surface of the first lens 810 may be concave. In addition, the object side surface of the first lens 810 may include at least one inflection point. That is, the object side surface of the first lens 810 may be concave in the paraxial portion, but may be convex in the edge portion. The second lens 820 may have a positive refractive power, the object side surface of the second lens 820 may be convex, and the image side surface of the second lens 820 may be concave. The third lens 830 may have a positive refractive power, and both the object side surface and the image side surface of the third lens 830 may be convex. The fourth lens 840 may have a positive refractive power, and both the object side surface and the image side surface of the fourth lens 840 may be convex. The fifth lens 850 may have a negative refractive power, and both the object side surface and the image side surface of the fifth lens 850 may be concave. In addition, the image side surface of the fifth lens 850 may include at least one inflection point. That is, the image side surface of the fifth lens 850 may be concave in the paraxial portion, but may be convex in the edge portion. The sixth lens 860 may have positive refractive power, the object side surface of the sixth lens 860 may be concave, and the image side surface of the sixth lens 860 may be convex. The seventh lens 870 may have negative refractive power, the object side surface of the seventh lens 870 may be convex, and the image side surface of the seventh lens 870 may be concave. In addition, each of the object side surface and the image side surface of the seventh lens 870 may include at least one inflection point. That is, the object side surface of the seventh lens 870 may be convex in the paraxial portion, but may be concave in the edge portion, and the image side surface of the seventh lens 870 may be concave in the paraxial portion, but may be convex in the edge portion.

[0181] The optical imaging system 800 according to the eighth embodiment of the present disclosure may include an infrared cut filter 880 and an image sensor 890 after the seventh lens 870 , and may further include a stop between the second lens 820 and the third lens 830 .

[0182] Table 15 shows the characteristics of the optical imaging system 800 according to the eighth embodiment of the present disclosure. The optical imaging system 800 according to the eighth embodiment of the present disclosure has a focal length of 2.0 mm, a field of view of 124.3 degrees, a height of an image plane of 7.0 mm, and an F value of 1.7.

[0183] [Table 15]

[0184]

[0185]

[0186] Table 16 shows aspherical surface values ​​of the optical imaging system 800 according to the eighth embodiment of the present disclosure.

[0187] [Table 16]

[0188]

[0189]

[0190]

[0191] Table 17 is a table showing values ​​associated with Conditional Expression 9 to Conditional Expression 11 according to an embodiment of the present disclosure.

[0192] [Table 17]

[0193]

[0194] One aspect of the present disclosure is to provide an optical imaging system that can obtain a bright image while satisfying a high resolution requirement.

[0195] As described above, according to the embodiments of the present disclosure, the optical imaging system can provide clear and bright images.

[0196] Although specific examples have been shown and described above, it will be apparent after understanding the present disclosure that various changes in form and detail may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are considered to be illustrative only and not for limiting purposes. The description of the features or aspects in each example is considered to be applicable to similar features or aspects in other examples. Suitable results may also be obtained if the described techniques are performed in a different order, and / or if the components in the described systems, architectures, devices, or circuits are combined in different ways and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of the present disclosure is not limited by specific embodiments, but by the claims and their equivalents, and all changes within the scope of the claims and their equivalents will be interpreted as included in the present disclosure.

Claims

1. An optical imaging system, characterized in that: Comprising: A first lens having a negative refractive power; A second lens; A third lens having a convex image side; A fourth lens; A fifth lens having a negative refractive power; A sixth lens having a positive refractive power; And A seventh lens having a convex object side, wherein, the first lens to the seventh lens are arranged in sequence from the object side, and satisfy TTL / IMG HT < 1.2, wherein, TTL is the distance on the optical axis from the object side of the first lens to the image plane, and IMG HT is the height of the image plane.

2. The optical imaging system according to claim 1, characterized in that: The second lens has a positive refractive power, and the image side of the second lens is concave.

3. The optical imaging system according to claim 1, characterized in that: The object side of the sixth lens is concave.

4. The optical imaging system according to claim 1, characterized in that: Satisfy 50 < FOV / f, wherein, FOV is the field of view of the optical imaging system, and f is the focal length of the optical imaging system.

5. The optical imaging system according to claim 1, characterized in that: Satisfy f / EPD < 1.8, wherein, f is the focal length of the optical imaging system, and EPD is the diameter of the entrance pupil.

6. The optical imaging system according to claim 1, characterized in that: Satisfy L6R1 / CT6 < -3, wherein, L6R1 is the radius of curvature of the object side of the sixth lens, and CT6 is the central thickness of the sixth lens.

7. The optical imaging system according to claim 1, characterized in that: Satisfy 15 < v1 - v2 < 40 and 0 < v1 - v5 < 45, wherein, v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, and v5 is the Abbe number of the fifth lens.

8. The optical imaging system according to claim 1, characterized in that: Satisfy 1.6 < ET1 / CT1, wherein, ET1 is the edge thickness of the first lens, and CT1 is the central thickness of the first lens.

9. The optical imaging system according to claim 1, characterized in that: The object side of the first lens is concave, and the fourth lens has a positive refractive power.

10. The optical imaging system according to claim 1, characterized in that: The image side of the fifth lens is concave, and the seventh lens has a negative refractive power.

11. An optical imaging system, characterized in that: Comprising: A first lens, both the object side and the image side of the first lens are concave; A second lens; A third lens having a positive refractive power; A fourth lens having a positive refractive power; A fifth lens; A sixth lens having a concave object side; And A seventh lens having a convex object side, wherein, the first lens to the seventh lens are arranged in sequence from the object side, and wherein, any one surface or any combination of any two or more surfaces of the first lens and the seventh lens includes one or more inflection points, and satisfy f / EPD < 1.8, wherein, f is the focal length of the optical imaging system, and EPD is the diameter of the entrance pupil.

12. The optical imaging system according to claim 11, characterized in that: Satisfy SD6 / SD14 < 0.5, wherein, SD6 is the effective diameter of the image side of the third lens, and SD14 is the effective diameter of the image side of the seventh lens.

13. The optical imaging system according to claim 11, characterized in that: The first lens has a negative refractive power, and satisfy -4 < f1 / f < 0, wherein, f1 is the focal length of the first lens.

14. The optical imaging system according to claim 11, characterized in that: The image side of the fifth lens is convex, and the seventh lens has a positive refractive power.

15. The optical imaging system according to claim 11, characterized in that: The image side of the fifth lens is concave, and the seventh lens has a negative refractive power.

16. The optical imaging system according to claim 11, characterized in that: Satisfy TTL / IMG HT < 1.2, wherein, TTL is the distance on the optical axis from the object side of the first lens to the image plane, and IMG HT is the height of the image plane.

Images