Optical imaging system

Abstract

The present application relates to an optical imaging system, which includes a first lens, a second lens, a third lens with negative refractive power, a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object side. The optical imaging system has a field of view of 120 degrees or more, and a distortion aberration at the highest height of an imaging surface is +30% or more or -30% or less.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2019-0150652 filed on November 21, 2019, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety for all purposes by reference. Technical Field

[0003] The following description relates to optical imaging systems having a field of view of 100 degrees or greater. Background Art

[0004] A compact camera may be mounted on a wireless terminal device. For example, the compact camera may be mounted on each of the front surface and the rear surface of the wireless terminal device. Since such a compact camera may be used for various purposes, in order to obtain images of landscapes, indoor portraits, etc., such a compact camera needs to have performance similar to that of a general camera. However, due to the limited size of the wireless terminal device, resulting in limited installation space, it may be difficult for the compact camera to achieve high performance. Therefore, it is necessary to develop an imaging lens system that can improve the performance of the compact camera without increasing the size of the compact camera. Summary of the invention

[0005] The purpose of providing this summary is to introduce a selection of inventive concepts in a concise form, and these inventive concepts will be further described in the following detailed description. This summary is not intended to identify the key features or essential features of the subject matter claimed, nor is it intended to help determine the scope of the subject matter claimed.

[0006] An optical imaging system with a wide field of view and a low F number.

[0007] In a general aspect, an optical imaging system includes a first lens, a second lens, a third lens having a negative refractive power, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from an object side. The optical imaging system has a field of view of 120 degrees or more, and a distortion aberration at a maximum height of an imaging plane is +30% or more or -30% or less.

[0008] The optical imaging system can satisfy 0.1<DS1S3 / 2IMGHT<0.2, wherein DS1S3 is the distance from the object side surface of the first lens to the object side surface of the second lens, and 2IMGHT is the diagonal length of the imaging surface.

[0009] The optical imaging system can satisfy 0.2<L1S1E / 2IMGHT<2.0, wherein L1S1E is the effective radius of the object side surface of the first lens, and 2IMGHT is the diagonal length of the imaging surface.

[0010] The Abbe number of the third lens may be less than 20.

[0011] The optical imaging system can satisfy TTL / 2IMGHT<0.9, wherein TTL is the distance from the object side surface of the first lens to the imaging surface, and 2IMGHT is the diagonal length of the imaging surface.

[0012] The F number of the optical imaging system may be 2.2 or less.

[0013] The optical imaging system may satisfy 0.8<DL2 / DL4<1.2, wherein DL2 is the thickness of the second lens at the center of the optical axis, and DL4 is the thickness of the fourth lens at the center of the optical axis.

[0014] The second lens may have positive refractive power.

[0015] An effective radius of the object-side surface of the third lens may be greater than an effective radius of the object-side surface of the second lens.

[0016] In another general aspect, an optical imaging system includes a first lens having a concave object side surface, a second lens, a third lens having a negative refractive power and a convex object side surface, a fourth lens, a fifth lens, and a sixth lens, which are sequentially arranged from the object side. The optical imaging system has a field of view of 120 degrees or more.

[0017] The second lens may have a convex object-side surface.

[0018] The fourth lens may have a concave object-side surface.

[0019] One of the object-side surface and the image-side surface of the fifth lens may be concave.

[0020] The sixth lens may have a concave image-side surface.

[0021] The second lens may have a convex image-side surface.

[0022] The third lens may have a concave image-side surface.

[0023] The first lens may have a concave image-side surface.

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

[0025] Figure 1 is a diagram showing a first example of an optical imaging system.

[0026] Figure 2 yes Figure 1 Aberration curves of the optical imaging system shown in .

[0027] Figure 3 is a diagram showing a second example of the optical imaging system.

[0028] Figure 4 yes Figure 3 Aberration curves of the optical imaging system shown in .

[0029] Figure 5 is a diagram showing a third example of the optical imaging system.

[0030] Figure 6 yes Figure 5 Aberration curves of the optical imaging system shown in .

[0031] Figure 7 is a diagram showing a fourth example of the optical imaging system.

[0032] Figure 8 yes Figure 7 Aberration curves of the optical imaging system shown in .

[0033] Fig. 9 is a diagram showing a fifth example of the optical imaging system.

[0034] Fig.10 yes Fig. 9 Aberration curves of the optical imaging system shown in .

[0035] Fig.11 is a diagram showing a sixth example of the optical imaging system.

[0036] Fig.12 yes Fig.11 Aberration curves of the optical imaging system shown in .

[0037] Throughout the drawings and detailed description, the same reference numerals refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative sizes, proportions, and depictions of elements in the drawings may be exaggerated. DETAILED DESCRIPTION

[0038] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described in this application. However, various changes, modifications and equivalents of the methods, devices and / or systems described in this application will be apparent to those of ordinary skill in the art. The sequence of operations described in this application is merely an example, and except for operations that must occur in a particular order, it is not limited to the order set forth in this application, but can be changed, which will be apparent to those of ordinary skill in the art. In addition, for greater clarity and brevity, the description of functions and structures known to those of ordinary skill in the art may be omitted.

[0039] The features described in this application may be implemented in different forms and should not be understood as being limited to the examples described in this application. Rather, the examples described in this application are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those of ordinary skill in the art.

[0040] It should be noted that in this application, the use of the word "may" with respect to examples or embodiments, for example, regarding what an example or embodiment may include or implement, means that there is at least one example or embodiment that includes or implements such features, and all examples and embodiments are not limited thereto.

[0041] 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, the element may be directly “on,” “connected to,” or “coupled to” the other element, or one or more other elements may be present between the element and the other element. Conversely, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, there may be no other elements between the element and the other element.

[0042] As used in this application, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0043] Although the terms "first", "second" and "third" may be used in this application to describe various members, components, regions, layers or parts, these members, components, regions, layers or parts are not limited by these terms. More specifically, these terms are only used to distinguish one member, component, region, layer or part from another member, component, region, layer or part. Therefore, without departing from the teachings of the examples described in this application, the first member, first component, first region, first layer or first part mentioned in these examples may also be referred to as the second member, second component, second region, second layer or second part.

[0044] Spatially relative terms such as "above", "higher", "below", and "lower" may be used in this application for descriptive convenience to describe the relationship of one element relative to another element as shown in the accompanying drawings. In addition to covering the orientations depicted in the accompanying drawings, these spatially relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the accompanying drawings is flipped, an element described as being "above" or "higher" relative to another element will be "below" or "lower" relative to the other element. Therefore, depending on the spatial orientation of the device, the term "above" covers both orientations of "above" and "below". The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used in this application should be interpreted accordingly.

[0045] The terms used in this application are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the articles "a", "an" and "the" are intended to also include plural forms. The words "include", "comprise" and "have" indicate the presence of the features, numbers, operations, components, elements and / or their combinations, but do not exclude the presence or addition of one or more other features, numbers, operations, components, elements and / or their combinations.

[0046] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described in the present application are not limited to the specific shapes shown in the drawings, but include variations in shapes that occur during manufacturing.

[0047] The features of the examples described in this application can be combined in various ways that will be apparent after understanding the disclosure of this application. In addition, although the examples described in this application have multiple configurations, other configurations that will be apparent after understanding the disclosure of this application are also possible.

[0048] The drawings may not be drawn to scale, and the relative sizes, proportions, and depictions of elements in the drawings may be exaggerated for clarity, illustration, and convenience.

[0049] In the examples, the first lens refers to a lens closest to the object (or subject), and the sixth lens refers to a lens closest to the imaging plane (or image sensor). In the examples, the units of the radius of curvature, thickness, TTL (the distance from the object side of the first lens to the imaging plane), 2IMGHT (the diagonal length of the imaging plane), and focal length are expressed in millimeters (mm).

[0050] The thickness of the lens, the gap between the lenses, and the TTL refer to the distance of the lenses on the optical axis. In addition, in the description of the shape of the lens, a configuration in which one face is convex means that the optical axis area of ​​the face is convex, and a configuration in which one face is concave means that the optical axis area of ​​the face is concave. Therefore, even when one face of the lens is described as convex, the edge of the lens may be concave. Similarly, even when one face of the lens is described as concave, the edge of the lens may be convex.

[0051] The optical imaging system may include six lenses. For example, the optical imaging system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence. The first lens to the sixth lens may be arranged with a predetermined gap therebetween. For example, a certain gap may be formed between the image side surface of the front lens and the object side surface of the rear lens.

[0052] The first lens may have a refractive power. One surface of the first lens may be concave. For example, the first lens may have a concave object-side surface. The first lens may include an aspherical surface. For example, both surfaces of the first lens may be aspherical. The first lens may be formed of a material having high light transmittance and excellent processability. For example, the first lens may be manufactured using a plastic material. However, the material of the first lens is not limited to a plastic material. For example, the first lens may be manufactured using a glass material.

[0053] The first lens has a predetermined refractive index. For example, the refractive index of the first lens may be less than 1.6. The first lens may have a predetermined Abbe number. For example, the Abbe number of the first lens may be 50 or greater.

[0054] The second lens may have refractive power. For example, the second lens may have positive refractive power.

[0055] One surface of the second lens may be convex. For example, the second lens may have a convex object side surface. The second lens may include an aspherical surface. For example, both surfaces of the second lens may be aspherical. The second lens may be formed of a material having high light transmittance and excellent processability. For example, the second lens may be manufactured using a plastic material. However, the material of the second lens is not limited to a plastic material. For example, the second lens may be manufactured using a glass material.

[0056] The second lens may have a refractive index similar to that of the first lens. For example, the refractive index of the second lens may be less than 1.6. The second lens may have a predetermined Abbe number. For example, the Abbe number of the second lens may be 50 or greater.

[0057] The third lens may have refractive power. For example, the third lens may have negative refractive power.

[0058] One surface of the third lens may be convex. For example, the third lens may have a convex object side surface. The third lens may include an aspherical surface. For example, both surfaces of the third lens may be aspherical. The third lens may be formed of a material having high light transmittance and excellent processability. For example, the third lens may be manufactured using a plastic material. However, the material of the third lens is not limited to a plastic material. For example, the third lens may be manufactured using a glass material.

[0059] The third lens may have a refractive index greater than that of the other lenses. The refractive index of the third lens may be 1.65 or greater. The third lens may have an Abbe number lower than that of the other lenses. The Abbe number of the third lens may be less than 20.

[0060] The fourth lens may have a refractive power. One surface of the fourth lens may be concave. For example, the fourth lens may have a concave object-side surface. The fourth lens may include an aspherical surface. For example, both surfaces of the fourth lens may be aspherical. The fourth lens may be formed of a material having high light transmittance and excellent processability. For example, the fourth lens may be manufactured using a plastic material. However, the material of the fourth lens is not limited to the plastic material. For example, the fourth lens may be manufactured using a glass material.

[0061] The fourth lens may have a predetermined refractive index. For example, the refractive index of the fourth lens may be less than 1.6. The fourth lens may have a predetermined Abbe number. For example, the Abbe number of the fourth lens may be 50 or greater.

[0062] The fifth lens may have a refractive power. One surface of the fifth lens may be concave. For example, the object side surface or the image side surface of the fifth lens may be concave. However, the shape of the fifth lens is not limited to the above examples. For example, both surfaces of the fifth lens may be convex. The fifth lens may include an aspherical surface. For example, both surfaces of the fifth lens may be aspherical. The fifth lens may have a shape with an inflection point. For example, the object side surface or the image side surface of the fifth lens may have an inflection point.

[0063] The fifth lens may be formed of a material having high light transmittance and excellent processability. For example, the fifth lens may be manufactured using a plastic material. However, the material of the fifth lens is not limited to the plastic material. For example, the fifth lens may be manufactured using a glass material.

[0064] The fifth lens may have a refractive index lower than that of the third lens. For example, the fifth lens may have a refractive index less than 1.65. The fifth lens may have an Abbe number greater than that of the third lens. For example, the Abbe number of the fifth lens may be 20 or greater.

[0065] The sixth lens may have refractive power. One surface of the sixth lens may be concave. For example, the sixth lens may have a concave image side surface. The sixth lens may have a shape with an inflection point. For example, two surfaces of the sixth lens may have one or more inflection points. The sixth lens may include an aspherical surface. For example, two surfaces of the sixth lens may be aspherical.

[0066] The sixth lens may be formed of a material having high light transmittance and excellent processability. For example, the sixth lens may be made of a plastic material. However, the material of the sixth lens is not limited to the plastic material. For example, the sixth lens may be made of a glass material.

[0067] The sixth lens may have a refractive index lower than that of the third lens. For example, the refractive index of the sixth lens may be less than 1.65. The sixth lens may have an Abbe number greater than that of the third lens. For example, the Abbe number of the sixth lens may be 20 or greater.

[0068] Each of the first to sixth lenses may have an aspherical shape. For example, at least one surface of the first to sixth lenses may be aspherical. The aspherical surface of each lens may be represented by Equation 1.

[0069] Equation 1:

[0070]

[0071] In Equation 1, "c" is the inverse of the radius of curvature of each lens, "k" is the cone constant, "r" is the distance from a specific point on the aspheric surface of the lens to the optical axis, "A to J" is the aspheric constant, and "Z" (or SAG) is the height from a specific point on the aspheric surface to the vertex of the aspheric surface in the direction of the optical axis.

[0072] The optical imaging system may further include an aperture stop, which may be disposed between the first lens and the second lens.

[0073] The optical imaging system may further include a filter. The filter may block some wavelengths of incident light from being incident through the first lens to the sixth lens. For example, the filter may block infrared wavelengths of the incident light.

[0074] The optical imaging system may further include an image sensor. The image sensor may provide an imaging surface, and the light refracted by the lens may be formed on the imaging surface. For example, the surface of the image sensor may form the imaging surface. The image sensor may be configured to achieve high resolution.

[0075] The optical imaging system may satisfy one or more of the following conditional expressions 1 to 8:

[0076] Conditional expression 1: 120°≤FOV

[0077] Conditional expression 2: 0.1<DS1S3 / 2IMGHT<0.2

[0078] Conditional expression 3: 0.2<L1S1E / 2IMGHT<2.0

[0079] Conditional expression 4: V3<20

[0080] Conditional expression 5: TTL / 2IMGHT<0.9

[0081] Conditional expression 6: F number < 2.2

[0082] Conditional expression 7: 0.8<DL2 / DL4<1.2

[0083] Conditional expression 8: L2S1E<L3S1E

[0084] In the above conditional expressions, FOV is the field of view of the optical imaging system, DS1S3 is the distance from the object side surface of the first lens to the object side surface of the second lens, 2IMGHT is the diagonal length of the imaging plane, L1S1E is the effective radius of the object side surface of the first lens, V3 is the Abbe number of the third lens, TTL is the distance from the object side surface of the first lens to the imaging plane, DL2 is the thickness of the second lens at the center of the optical axis, DL4 is the thickness of the fourth lens at the center of the optical axis, L2S1E is the effective radius of the object side surface of the second lens, and L3S1E is the effective radius of the object side surface of the third lens.

[0085] The optical imaging system may also satisfy one or more of the following conditional expressions 9 and 10:

[0086] Conditional expression 9: 2.0<TTL / f<3.0

[0087] Conditional expression 10: 1.6<SL / f<2.2

[0088] In the conditional expression, f is the focal length of the optical imaging system, and SL is the distance from the aperture to the imaging plane.

[0089] The optical imaging system may have a distortion aberration of considerable size at the highest height of the imaging plane. For example, the optical imaging system may have a distortion aberration of +30% or more or -30% or less at the highest height of the imaging plane.

[0090] The optical imaging system and the first to sixth lenses may have predetermined focal lengths. For example, the focal length (f) of the optical imaging system may be in the range of 2.4 mm to 2.9 mm, the focal length (f1) of the first lens may be in the range of -10 mm to -3.5 mm, the focal length (f2) of the second lens may be in the range of 2.0 mm to 2.5 mm, the focal length (f3) of the third lens may be in the range of -8.0 mm to -4.5 mm, the focal length (f4) of the fourth lens may be in the range of 2.0 mm to 4.0 mm, the focal length (f5) of the fifth lens may be in the range of less than -20 mm or 8 mm or more, and the focal length (f6) of the sixth lens may be in the range of -4.0 mm to -1.2 mm.

[0091] The first to sixth lenses have an effective area for refracting light. The diameter and radius of the effective area may vary for each lens. For example, the effective radius of the object side of the third lens may be greater than the effective radius of the object side of the second lens.

[0092] In the following description, various examples of optical imaging systems will be described.

[0093] Will refer to Figure 1 A first example of an optical imaging system is described.

[0094] The optical imaging system 100 may include a plurality of lenses, each of which has a refractive power. For example, the optical imaging system 100 may include a first lens 110 , a second lens 120 , a third lens 130 , a fourth lens 140 , a fifth lens 150 , and a sixth lens 160 .

[0095] The first lens 110 may have a negative refractive power and may have a concave object-side surface and a concave image-side surface. The second lens 120 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The third lens 130 may have a negative refractive power and may have a convex object-side surface and a concave image-side surface. The fourth lens 140 may have a positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 150 may have a negative refractive power and may have a convex object-side surface and a concave image-side surface. The fifth lens 150 may have a shape with an inflection point. For example, an inflection point may be formed on at least one of the object-side surface and the image-side surface of the fifth lens 150. The sixth lens 160 may have a negative refractive power and may have a convex object-side surface and a concave image-side surface. The sixth lens 160 may have a shape with an inflection point. For example, an inflection point may be formed on at least one of the object-side surface and the image-side surface of the sixth lens 160. One surface of the sixth lens 160 may have both a concave shape and a convex shape. For example, the object side surface of the sixth lens may be convex at the paraxial region and concave around the paraxial region, and the image side surface of the sixth lens may be concave at the paraxial region and convex around the paraxial region.

[0096] The third lens 130 may have the largest refractive index among the first to sixth lenses 110 to 160. For example, the third lens 130 may have a refractive index of 1.65 or more, and the other lenses may have a refractive index less than 1.65.

[0097] The third lens 130 may have the smallest Abbe number among the first to sixth lenses 110 to 160. For example, the third lens 130 may have an Abbe number less than 20, but the other lenses may have an Abbe number of 20 or more.

[0098] The optical imaging system 100 may include a stop ST. For example, the stop ST may be disposed between the first lens 110 and the second lens 120. The stop ST may adjust the amount of light incident on the imaging surface 180.

[0099] The optical imaging system 100 may include a filter 170. For example, the filter 170 may be disposed between the sixth lens 160 and the imaging surface 180. The filter 170 may block light of a specific wavelength from entering. For example, the filter 170 of the exemplary embodiment may block infrared light from being incident on the imaging surface 180.

[0100] The optical imaging system 100 may include an image sensor. The image sensor provides an imaging surface 180, and light refracted by a lens is formed on the imaging surface 180. The image sensor may convert an optical signal formed on the imaging surface 180 into an electrical signal.

[0101] The optical imaging system 100 can present Figure 2The following Table 1 shows lens characteristics of the optical imaging system 100, and Table 2 shows aspherical surface characteristics of the optical imaging system 100.

[0102] The optical imaging system 100 may have a distortion aberration of a considerable size at the highest height of the imaging plane. For example, the optical imaging system 100 may have a distortion aberration of about -40% at the highest height of the imaging plane.

[0103] Table 1

[0104]

[0105] Table 2

[0106] Face number r K A B C D E F G H J S1 -8.8875 2.043 0.215 -0.174 0.152 -0.113 0.062 -0.024 0.006 -0.001 0.000 S2 3.6126 11.760 0.191 1.144 -7.589 27.924 -63.726 92.239 -82.149 40.989 -8.804 S3 3.7477 -3.104 -0.127 2.187 -19.857 112.497 -414.0 982.9 -1451.0 1209.3 -434.4 S4 -1.5308 -1.784 -0.130 1.088 -5.678 17.437 -35.316 46.950 -39.413 18.937 -3.976 S5 3.0558 -3.664 -0.349 1.336 -4.511 10.579 -17.293 19.155 -13.702 5.702 -1.046 S6 1.7680 -1.634 -0.335 0.730 -1.408 1.988 -2.016 1.444 -0.709 0.219 -0.032 S7 -11.5612 70.689 0.001 0.083 -0.299 0.584 -0.733 0.584 -0.283 0.076 -0.009 S8 -1.6555 -0.586 0.119 -0.376 0.750 -0.960 0.780 -0.402 0.126 -0.022 0.002 S9 9.6839 -74.916 0.128 -0.451 0.704 -0.748 0.530 -0.246 0.070 -0.011 0.001 S10 9.3906 12.571 0.081 -0.237 0.227 -0.125 0.043 -0.010 0.001 0.000 0.000 S11 4.6765 -27.074 -0.141 -0.062 0.093 -0.040 0.009 -0.001 0.000 0.000 0.000 S12 1.3598 -0.821 -0.296 0.139 -0.051 0.014 -0.003 0.000 0.000 0.000 0.000

[0107] Will refer to Figure 3 A second example of an optical imaging system is described.

[0108] The optical imaging system 200 may include a plurality of lenses, each of which has a refractive power. For example, the optical imaging system 200 may include a first lens 210 , a second lens 220 , a third lens 230 , a fourth lens 240 , a fifth lens 250 , and a sixth lens 260 .

[0109] The first lens 210 may have a negative refractive power and may have a concave object-side surface and a concave image-side surface. The second lens 220 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The third lens 230 may have a negative refractive power and may have a convex object-side surface and a concave image-side surface. The fourth lens 240 may have a positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 250 may have a negative refractive power and may have a convex object-side surface and a concave image-side surface. The fifth lens 250 may have a shape with an inflection point. For example, an inflection point may be formed on at least one of the object-side surface and the image-side surface of the fifth lens 250. The sixth lens 260 may have a negative refractive power and may have a convex object-side surface and a concave image-side surface. The sixth lens 260 may have a shape with an inflection point. For example, an inflection point may be formed on at least one of the object-side surface and the image-side surface of the sixth lens 260. One surface of the sixth lens 260 may have both a concave shape and a convex shape. For example, the object side surface of the sixth lens may be convex at the paraxial region and concave around the paraxial region, and the image side surface of the sixth lens may be concave at the paraxial region and convex around the paraxial region.

[0110] The third lens 230 may have the largest refractive index among the first to sixth lenses 210 to 260. For example, the third lens 230 may have a refractive index of 1.65 or more, and the other lenses may have a refractive index less than 1.65.

[0111] The third lens 230 may have the smallest Abbe number among the first to sixth lenses 210 to 260. For example, the third lens 230 may have an Abbe number less than 20, and the other lenses may have an Abbe number of 20 or more.

[0112] The optical imaging system 200 may include a stop ST. For example, the stop ST may be disposed between the first lens 210 and the second lens 220. The stop ST may adjust the amount of light incident on the imaging surface 280.

[0113] The optical imaging system 200 may include a filter 270. For example, the filter 270 may be disposed between the sixth lens 260 and the imaging surface 280. The filter 270 may block light of a specific wavelength from entering. For example, the filter 270 of the exemplary embodiment may block infrared light from being incident on the imaging surface 280.

[0114] The optical imaging system 200 may include an image sensor. The image sensor may provide an imaging surface 280, and light refracted by the lens is formed on the imaging surface 280. The image sensor may convert the optical signal formed on the imaging surface 280 into an electrical signal.

[0115] The optical imaging system 200 can present Figure 4 The following Table 3 shows the lens characteristics of the optical imaging system 200, and Table 4 shows the aspherical surface characteristics of the optical imaging system 200.

[0116] The optical imaging system 200 may have a distortion aberration of a considerable size at the highest height of the imaging plane. For example, the optical imaging system 200 may have a distortion aberration of about -40% at the highest height of the imaging plane.

[0117] Table 3

[0118]

[0119] Table 4

[0120] Face number r K A B C D E F G H J S1 -10.3584 11.815 0.242 -0.203 0.181 -0.136 0.076 -0.031 0.008 -0.001 0.000 S2 3.4195 10.543 0.222 1.125 -7.742 29.032 -67.347 99.211 -90.082 45.930 -10.122 S3 4.1502 -7.801 -0.134 2.268 -21.016 121.494 -457.3 1112.6 -1685.1 1442.0 -532.1 S4 -1.5052 -1.392 -0.180 1.181 -5.663 16.973 -34.192 45.484 -38.272 18.441 -3.886 S5 4.2325 0.011 -0.275 0.996 -3.235 7.171 -10.986 11.373 -7.634 3.011 -0.531 S6 2.1214 -0.918 -0.210 0.307 -0.394 0.306 -0.092 -0.048 0.046 -0.009 -0.001 S7 -12.2048 74.489 0.014 0.020 -0.117 0.252 -0.345 0.294 -0.149 0.041 -0.005 S8 -1.6005 -0.917 0.178 -0.508 0.913 -1.101 0.868 -0.442 0.139 -0.024 0.002 S9 14.5143 42.436 0.164 -0.527 0.811 -0.851 0.594 -0.271 0.076 -0.012 0.001 S10 11.2378 -4.159 0.065 -0.186 0.179 -0.098 0.033 -0.007 0.001 0.000 0.000 S11 4.1654 -4.973 -0.198 -0.025 0.095 -0.051 0.015 -0.003 0.000 0.000 0.000 S12 1.3068 -0.808 -0.330 0.172 -0.071 0.022 -0.005 0.001 0.000 0.000 0.000

[0121] Will refer to Figure 5 A third example of an optical imaging system is described.

[0122] The optical imaging system 300 may include a plurality of lenses, each of which has a refractive power. For example, the optical imaging system 300 may include a first lens 310 , a second lens 320 , a third lens 330 , a fourth lens 340 , a fifth lens 350 , and a sixth lens 360 .

[0123] The first lens 310 may have a negative refractive power and may have a concave object-side surface and a concave image-side surface. The second lens 320 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The third lens 330 may have a negative refractive power and may have a convex object-side surface and a concave image-side surface. The fourth lens 340 may have a positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 350 may have a positive refractive power and may have a convex object-side surface and a concave image-side surface. The fifth lens 350 may have a shape with an inflection point. For example, an inflection point may be formed on at least one of the object-side surface and the image-side surface of the fifth lens 350. The sixth lens 360 may have a negative refractive power and may have a convex object-side surface and a concave image-side surface. The sixth lens 360 may have a shape with an inflection point. For example, an inflection point may be formed on at least one of the object-side surface and the image-side surface of the sixth lens 360. One surface of the sixth lens 360 may have both a concave shape and a convex shape. For example, the object side surface of the sixth lens may be convex at the paraxial region and concave around the paraxial region, and the image side surface of the sixth lens may be concave at the paraxial region and convex around the paraxial region.

[0124] The third lens 330 may have the largest refractive index among the first to sixth lenses 310 to 360. For example, the third lens 330 may have a refractive index of 1.65 or more, but the other lenses may have a refractive index less than 1.65.

[0125] The third lens 330 may have the smallest Abbe number among the first to sixth lenses 310 to 360. For example, the third lens 330 may have an Abbe number less than 20, and the other lenses may have an Abbe number of 20 or more.

[0126] The optical imaging system 300 may include a stop ST. For example, the stop ST may be disposed between the first lens 310 and the second lens 320. The stop ST may adjust the amount of light incident on the imaging surface 380.

[0127] The optical imaging system 300 may include a filter 370. For example, the filter 370 may be disposed between the sixth lens 360 and the imaging surface 380. The filter 370 may block light of a specific wavelength from entering. For example, the filter 370 of the exemplary embodiment may block infrared light from being incident on the imaging surface 380.

[0128] The optical imaging system 300 may include an image sensor. The image sensor may provide an imaging surface 380, and light refracted by the lens is formed on the imaging surface 380. The image sensor may convert the optical signal formed on the imaging surface 380 into an electrical signal.

[0129] The optical imaging system 300 can present Figure 6The following Table 5 shows the lens characteristics of the optical imaging system 300, and Table 6 shows the aspherical surface characteristics of the optical imaging system 300.

[0130] The optical imaging system 300 may have a distortion aberration of a considerable size at the highest height of the imaging plane. For example, the optical imaging system 300 may have a distortion aberration of about -40% at the highest height of the imaging plane.

[0131] Table 5

[0132]

[0133] Table 6

[0134]

[0135]

[0136] Will refer to Figure 7 A fourth example of an optical imaging system is described.

[0137] The optical imaging system 400 may include a plurality of lenses, each of which has a refractive power. For example, the optical imaging system 400 may include a first lens 410 , a second lens 420 , a third lens 430 , a fourth lens 440 , a fifth lens 450 , and a sixth lens 460 .

[0138] The first lens 410 may have a negative refractive power and may have a concave object-side surface and a concave image-side surface. The second lens 420 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The third lens 430 may have a negative refractive power and may have a convex object-side surface and a concave image-side surface. The fourth lens 440 may have a positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 450 may have a positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 450 may have a shape with an inflection point. For example, an inflection point may be formed on at least one of the object-side surface and the image-side surface of the fifth lens 450. The sixth lens 460 may have a negative refractive power and may have a concave object-side surface and a concave image-side surface. The sixth lens 460 may have a shape with an inflection point. For example, an inflection point may be formed on at least one of the object-side surface and the image-side surface of the sixth lens 460. One surface of the sixth lens 460 may have both a concave shape and a convex shape. For example, the image side surface of the sixth lens may be concave at the paraxial region, and may be convex around the paraxial region.

[0139] The third lens 430 may have the largest refractive index among the first to sixth lenses 410 to 460. For example, the third lens 430 may have a refractive index of 1.65 or more, and the other lenses may have a refractive index less than 1.65.

[0140] The third lens 430 may have the smallest Abbe number among the first to sixth lenses 410 to 460. For example, the third lens 430 may have an Abbe number less than 20, and the other lenses may have an Abbe number of 20 or more.

[0141] The optical imaging system 400 may include a stop ST. For example, the stop ST may be disposed between the first lens 410 and the second lens 420. The stop ST may adjust the amount of light incident on the imaging surface 480.

[0142] The optical imaging system 400 may include a filter 470. For example, the filter 470 may be disposed between the sixth lens 460 and the imaging surface 480. The filter 470 may block light of a specific wavelength from entering. For example, the filter 470 of the exemplary embodiment may block infrared light from being incident on the imaging surface 480.

[0143] The optical imaging system 400 may include an image sensor. The image sensor may provide an imaging surface 480, and light refracted by the lens is formed on the imaging surface 480. The image sensor may convert the optical signal formed on the imaging surface 480 into an electrical signal.

[0144] The optical imaging system 400 can present Figure 8 The aberration characteristics shown in . The following Table 7 shows the lens characteristics of the optical imaging system 400, and Table 8 shows the aspherical surface characteristics of the optical imaging system 400.

[0145] The optical imaging system 400 may have a distortion aberration of a considerable size at the highest height of the imaging plane. For example, the optical imaging system 400 may have a distortion aberration of about -35% at the highest height of the imaging plane.

[0146] Table 7

[0147]

[0148] Table 8

[0149]

[0150]

[0151] Will refer to Fig. 9 A fifth example of an optical imaging system is described.

[0152] The optical imaging system 500 may include a plurality of lenses, each of which has a refractive power. For example, the optical imaging system 500 may include a first lens 510 , a second lens 520 , a third lens 530 , a fourth lens 540 , a fifth lens 550 , and a sixth lens 560 .

[0153] The first lens 510 may have a negative refractive power and may have a concave object-side surface and a concave image-side surface. The second lens 520 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The third lens 530 may have a negative refractive power and may have a convex object-side surface and a concave image-side surface. The fourth lens 540 may have a positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 550 may have a positive refractive power and may have a convex object-side surface and a convex image-side surface. The fifth lens 550 may have a shape with an inflection point. For example, an inflection point may be formed on at least one of the object-side surface and the image-side surface of the fifth lens 550. The sixth lens 560 may have a negative refractive power and may have a concave object-side surface and a concave image-side surface. The sixth lens 560 may have a shape with an inflection point. For example, an inflection point may be formed on at least one of the object-side surface and the image-side surface of the sixth lens 560. One surface of the sixth lens 560 may have both a concave shape and a convex shape. For example, the object side surface of the sixth lens may be concave at the paraxial region and may be convex around the paraxial region, and the image side surface of the sixth lens may be concave at the paraxial region and may be convex around the paraxial region.

[0154] The third lens 530 may have the largest refractive index among the first to sixth lenses 510 to 560. For example, the third lens 530 may have a refractive index of 1.65 or more, and the other lenses may have a refractive index less than 1.65.

[0155] The third lens 530 may have the smallest Abbe number among the first to sixth lenses 510 to 560. For example, the third lens 530 may have an Abbe number less than 20, and the other lenses may have an Abbe number of 20 or more.

[0156] The optical imaging system 500 may include an aperture ST. For example, the aperture ST may be disposed between the first lens 510 and the second lens 520. The aperture ST may adjust the amount of light incident on the imaging surface 580.

[0157] The optical imaging system 500 may include a filter 570. For example, the filter 570 may be disposed between the sixth lens 560 and the imaging surface 580. The filter 570 may block light of a specific wavelength from entering. For example, the filter 570 of the exemplary embodiment may block infrared light from being incident on the imaging surface 580.

[0158] The optical imaging system 500 may include an image sensor. The image sensor may provide an imaging surface 580, and light refracted by the lens is formed on the imaging surface 580. The image sensor may convert the optical signal formed on the imaging surface 580 into an electrical signal.

[0159] The optical imaging system 500 can present Fig.10 The aberration characteristics shown in . The following Table 9 shows the lens characteristics of the optical imaging system 500, and Table 10 shows the aspherical surface characteristics of the optical imaging system 500.

[0160] The optical imaging system 500 may have a distortion aberration of a considerable size at the highest height of the imaging plane. For example, the optical imaging system 500 may have a distortion aberration of about -35% at the highest height of the imaging plane.

[0161] Table 9

[0162]

[0163] Table 10

[0164]

[0165]

[0166] Will refer to Fig.11 A sixth example of an optical imaging system is described.

[0167] The optical imaging system 600 may include a plurality of lenses, each of which has a refractive power. For example, the optical imaging system 600 may include a first lens 610 , a second lens 620 , a third lens 630 , a fourth lens 640 , a fifth lens 650 , and a sixth lens 660 .

[0168] The first lens 610 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The second lens 620 may have a positive refractive power and may have a convex object side surface and a convex image side surface. The third lens 630 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The fourth lens 640 may have a positive refractive power and may have a concave object side surface and a convex image side surface. The fifth lens 650 may have a negative refractive power and may have a concave object side surface and a concave image side surface. The fifth lens 650 may have a shape with an inflection point. For example, an inflection point may be formed on at least one of the object side surface and the image side surface of the fifth lens 650. The sixth lens 660 may have a negative refractive power and may have a convex object side surface and a concave image side surface. The sixth lens 660 may have a shape with an inflection point. For example, an inflection point may be formed on at least one of the object side surface and the image side surface of the sixth lens 660. One surface of the sixth lens 660 may have both a concave shape and a convex shape. For example, the object side surface of the sixth lens may be convex at the paraxial region and concave around the paraxial region, and the image side surface of the sixth lens may be concave at the paraxial region and convex around the paraxial region.

[0169] The third lens 630 may have the largest refractive index among the first to sixth lenses 610 to 660. For example, the third lens 630 may have a refractive index of 1.65 or more, and the other lenses may have a refractive index less than 1.65.

[0170] The third lens 630 may have the smallest Abbe number among the first to sixth lenses 610 to 660. For example, the third lens 630 may have an Abbe number less than 20, and the other lenses may have an Abbe number of 20 or more.

[0171] The optical imaging system 600 may include an aperture ST. For example, the aperture ST may be disposed between the first lens 610 and the second lens 620. The aperture ST may adjust the amount of light incident on the imaging surface 680.

[0172] The optical imaging system 600 may include a filter 670. For example, the filter 670 may be disposed between the sixth lens 660 and the imaging surface 680. The filter 670 may block light of a specific wavelength from entering. For example, the filter 670 of the exemplary embodiment may block infrared light from being incident on the imaging surface 680.

[0173] The optical imaging system 600 may include an image sensor. The image sensor may provide an imaging surface 680, and light refracted by the lens is formed on the imaging surface 680. The image sensor may convert the optical signal formed on the imaging surface 680 into an electrical signal.

[0174] The optical imaging system 600 can present Fig.11The following Table 11 shows the lens characteristics of the optical imaging system 600, and Table 12 shows the aspherical surface characteristics of the optical imaging system 600.

[0175] The optical imaging system 600 may have a relatively large distortion aberration at the highest height of the imaging plane. For example, the optical imaging system 600 may have a distortion aberration of about -35% at the highest height of the imaging plane.

[0176] Table 11

[0177]

[0178] Table 12

[0179] Face number r K A B C D E F G H J S1 -5.6645 -6.817 0.197 -0.122 0.072 -0.020 -0.009 0.012 -0.005 0.001 0.000 S2 14.5459 -99.000 0.275 -0.129 0.303 -0.996 2.474 -3.627 3.094 -1.412 0.262 S3 4.3848 -13.513 -0.007 0.063 -0.905 3.915 -11.140 22.579 -42.015 62.423 -43.822 S4 -1.6066 -1.546 -0.043 0.333 -2.652 9.223 -19.937 27.635 -24.138 12.124 -2.691 S5 4.3362 1.843 -0.201 0.644 -2.584 6.676 -11.394 12.720 -8.924 3.567 -0.619 S6 2.1666 -0.834 -0.234 0.508 -1.175 1.999 -2.390 1.948 -1.025 0.314 -0.042 S7 -10.7495 54.243 -0.038 0.057 -0.007 -0.067 0.106 -0.080 0.034 -0.007 0.001 S8 -1.1315 -1.043 0.070 0.116 -0.258 0.229 -0.109 0.029 -0.004 0.000 0.000 S9 -21.4222 62.653 0.007 0.221 -0.448 0.398 -0.218 0.079 -0.018 0.002 0.000 S10 40.1732 85.631 0.260 -0.264 0.107 -0.010 -0.008 0.004 -0.001 0.000 0.000 S11 12.5173 -75.714 0.199 -0.487 0.422 -0.197 0.056 -0.010 0.001 0.000 0.000 S12 1.1334 -1.059 -0.268 0.078 -0.003 -0.006 0.002 0.000 0.000 0.000 0.000

[0180] Table 13 and Table 14 list the optical characteristic values ​​and the values ​​of the conditional expressions of the optical imaging systems of the first example to the sixth example.

[0181] Table 13

[0182] mark First example Second example Third Example Fourth Example Fifth example Sixth Example F-number 2.2000 2.2411 2.2269 2.4518 2.4025 2.4393 TTL 6.1760 6.1750 6.1750 6.1276 6.1900 6.1750 SL 5.1245 5.8118 5.1412 4.8288 4.9026 4.8780 IMGHT 3.6280 3.6280 3.6280 3.6280 3.6280 3.6280 FOV 128.40 128.40 128.45 120.56 127.48 123.39 f 2.677 2.677 2.677 2.800 2.680 2.690 f1 -4.647 -4.661 -4.753 -9.316 -7.786 -7.413 f2 2.136 2.161 2.171 2.367 2.347 2.270 f3 -6.655 -6.709 -6.706 -6.965 -6.811 -6.665 f4 3.417 3.270 3.497 2.358 2.892 2.225 f5 -1003.7 -80.824 67.538 35.858 8.204 -21.577 f6 -3.138 -3.146 -3.112 -1.985 -1.779 -2.207

[0183] Table 14

[0184]

[0185]

[0186] According to the above examples, an optical imaging system having a field of view of 100 degrees or more and an f-number of 2.2 or less can be provided.

[0187] Although the present disclosure includes specific examples, it will be apparent after understanding the disclosure of the present application 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 should be understood in a descriptive sense only, and not for limiting purposes. The description of the features or aspects in each example should be understood to be applicable to similar features or aspects in other examples. 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, appropriate results can still be achieved. Therefore, the scope of the present disclosure is not limited by specific embodiments, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be interpreted as included in the present disclosure.

Claims

1. An optical imaging system, comprising: A first lens having a negative refractive power; A second lens having a positive refractive power; A third lens having a negative refractive power and a convex object side; A fourth lens having a positive refractive power; A fifth lens having a negative refractive power; And A sixth lens having a negative refractive power and a convex object side, Wherein, the first lens to the sixth lens are sequentially arranged from the object side in order, Wherein, the optical imaging system has a total of six lenses with refractive power, Wherein, at least one of the first lens to the sixth lens has an aspherical surface, Wherein, 0.1 < DS1S3 / 2IMGHT < 0.2, and 0.8 < DL2 / DL4 < 1.2, where DS1S3 is the distance from the object side of the first lens to the object side of the second lens, 2IMGHT is the diagonal length of the imaging surface, DL2 is the thickness of the second lens at the center of the optical axis, and DL4 is the thickness of the fourth lens at the center of the optical axis, Wherein, the field of view of the optical imaging system is 120 degrees or greater and 128.4 degrees or less, and Wherein, the focal length of the optical imaging system is in the range of 2.4 mm to 2.9 mm, and the focal length of the sixth lens is in the range of -3.146 mm to -1.2 mm.

2. The optical imaging system according to claim 1, wherein: The first lens has a concave object side.

3. The optical imaging system according to claim 1, wherein: The second lens has a convex object side.

4. The optical imaging system according to claim 1, wherein: The fourth lens has a convex image side.

5. The optical imaging system according to claim 1, wherein: The sixth lens has a concave image side.

6. The optical imaging system according to claim 1, wherein: The F-number is 2.2 or less.

7. The optical imaging system according to claim 1, wherein: The refractive index of the first lens is less than 1.

6.

8. The optical imaging system according to claim 1, wherein: The refractive index of the fourth lens is less than 1.

6.

9. The optical imaging system according to claim 1, wherein: The focal length of the fourth lens is in the range of 2.0 mm to 4.0 mm.

10. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies 0.2 < L1S1E / 2IMGHT < 2.0, where L1S1E is the effective radius of the object side of the first lens.

11. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies 1.6 < SL / f < 2.2, where f is the focal length of the optical imaging system, and SL is the distance from the diaphragm to the imaging surface.

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