Optical imaging system

Abstract

An optical imaging system includes a first lens having a refractive power, a second lens having a refractive power and a convex object side, a third lens having a refractive power and a convex object side, a fourth lens having a refractive power, a fifth lens having a refractive power, and a sixth lens having a negative refractive power. The optical imaging system satisfies 100° ≤ FOV and -2.0 < {IMGHT / (f*tan(FOV / 2)) - 1} * 100 < 2.0, where FOV is a field of view of the optical imaging system, IMGHT is half of a diagonal length of an imaging surface, and f is a focal length of the optical imaging system.

Description

[0001] Cross-references to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2020-0120733, filed on September 18, 2020, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. Technical Field

[0003] This disclosure relates to an optical imaging system having a wide field of view of 100 degrees or more. Background Technology

[0004] Small cameras can be mounted on wireless terminal devices. For example, a small camera can be mounted on each of the front and rear surfaces of a wireless terminal device. Since such small cameras can be used for various purposes, such as obtaining images of landscapes, indoor portraits, etc., they need to have a performance level similar to that of ordinary cameras. However, due to the limited size of wireless terminal devices, installation space may be limited, making it difficult for small cameras to achieve high performance. Therefore, it is necessary to develop an optical imaging system that can improve the performance of small cameras without increasing their size.

[0005] The above information is presented as background information only to aid in understanding this disclosure. No determination or assertion is made as to whether any of the above content can be used as prior art with respect to this disclosure. Summary of the Invention

[0006] The summary portion of this invention is intended to provide a brief overview of the chosen inventive concepts, which will be further described in the detailed description portion below. This summary portion is not intended to identify key or essential features of the claimed subject matter, nor to help determine the scope of the claimed subject matter.

[0007] In one general aspect, the optical imaging system includes: a first lens with refractive power, a second lens with refractive power and a convex object-side surface, a third lens with refractive power and a convex object-side surface, a fourth lens with refractive power, a fifth lens with refractive power, and a sixth lens with negative refractive power, wherein the first to sixth lenses are arranged sequentially from the object side. The optical imaging system satisfies 100°≤FOV and -2.0<{IMGHT / (f*tan(FOV / 2))-1}*100<2.0, where FOV is the field of view of the optical imaging system, IMGHT is half the diagonal length of the imaging plane, and f is the focal length of the optical imaging system.

[0008] The first lens may have a concave object side or a concave image side.

[0009] The fourth lens can have a concave object side surface.

[0010] The fifth lens can have a convex object side surface or a convex image side surface.

[0011] The sixth lens can have a convex object side surface.

[0012] The sixth lens can have a concave image side surface.

[0013] The optical imaging system can satisfy -1.5 < f3 / f4 < -0.7, where f3 is a focal length of the third lens, and f4 is a focal length of the fourth lens.

[0014] The optical imaging system can satisfy 0.6 < |f4 / f6| < 1.8, where f4 is a focal length of the fourth lens, and f6 is a focal length of the sixth lens.

[0015] The optical imaging system can satisfy 1.3 < TTL / IMGHT < 1.4, where TTL is a distance from an object side surface of the first lens to an image plane.

[0016] The optical imaging system can satisfy 1.8 < f-number < 2.3.

[0017] In another general aspect, an optical imaging system includes a first lens having a refractive power, a second lens having a refractive power and having a convex object side surface, a third lens having a refractive power and having a convex object side surface, a fourth lens having a refractive power, a fifth lens having a refractive power, and a sixth lens having a refractive power, wherein the first lens through the sixth lens are sequentially arranged from an object side, and wherein 100° ≤ FOV, -2.0 < {IMGHT / (f*tan(FOV / 2))-1}*100 < 2.0, and TTL / IMGHT < 1.4.

[0018] A sign of the refractive power of the first lens can be different from a sign of the refractive power of the second lens.

[0019] A sign of the refractive power of the fourth lens can be different from a sign of the refractive power of the fifth lens.

[0020] The sixth lens can have a negative refractive power.

[0021] The optical imaging system can satisfy 1.0 < f1 / f3 < 3.0, where f1 is a focal length of the first lens.

[0022] The optical imaging system can satisfy 0.2 < f3 / f5 < 2.0, where f5 is a focal length of the fifth lens.

[0023] Other features and aspects will become apparent from the following specific description, drawings and appended claims. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a graph illustrating a first example of an optical imaging system.

[0025] Figure 2 presented Figure 1 aberration curves of the optical imaging system illustrated in

[0026] Figure 3 is a graph illustrating a second example of an optical imaging system.

[0027] Figure 4 presented Figure 3 aberration curves of the optical imaging system illustrated in

[0028] Figure 5 is a graph illustrating a third example of an optical imaging system.

[0029] Figure 6 presented Figure 5 aberration curves of the optical imaging system illustrated in

[0030] Figure 7 is a graph illustrating a fourth example of an optical imaging system.

[0031] Figure 8 presented Figure 7 aberration curves of the optical imaging system illustrated in

[0032] Figure 9 is a graph illustrating a fifth example of an optical imaging system.

[0033] Figure 10 presented Figure 9 aberration curves of the optical imaging system illustrated in

[0034] Throughout the drawings and specific embodiments, identical reference numerals refer to like elements. The drawings can not be to scale and the dimensions, proportions, and shapes of parts can be exaggerated for clarity, illustration and convenience. DETAILED DESCRIPTION

[0035] The following detailed description is provided to help the reader understand the methods, apparatus and / or systems described in this application. However, various changes, modifications and equivalents can be resorted to by those skilled in the art after understanding the nature of the methods, apparatus and / or systems described in this application. For example, the order of the operations described in this application can be varied, except those operations which must occur in a specific order, without departing from the application, and the sequences can be changed, which will be apparent to those skilled in the art after understanding the present disclosure. Also, descriptions of features that would be known in the art have been omitted for the sake of clarity and conciseness.

[0036] The features described in this application can be implemented in different forms and should not be construed as limited to the examples described in this application. Rather, these examples are provided as illustrative of a number of possible ways to implement the methods, devices, and / or systems described in this application, which become apparent after understanding the present disclosure.

[0037] It should be noted that in this application, the use of the phrase “may”, for example with respect to what an example or embodiment can include or implement, means that there is at least one example or embodiment in which the feature is included or implemented, and that all examples and embodiments are not limited to this.

[0038] Throughout the specification, when an element such as a layer, region, or substrate is referred to as being “on”, “connected to”, or “coupled to” another element, it can be directly on, directly connected to, or directly coupled to the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is referred to as being “directly on”, “directly connected to”, or “directly coupled to” another element, then there are no other elements interposed therebetween.

[0039] As used in this application, the term “and / or” includes any one of the associated listed items, as well as any combination of any two or more of the associated listed items.

[0040] Although the terms such as “first”, “second”, and “third” can be used in this application to describe various components, members, regions, layers, or parts, these components, members, regions, layers, or parts are not limited by the terms. Rather, these terms are used only to distinguish one component, member, region, layer, or part from another component, member, region, layer, or part. Therefore, the first component, first member, first region, first layer, or first part mentioned in these examples can also be called the second component, second member, second region, second layer, or second part, without departing from the teachings of the examples described in this application.

[0041] Spatially relative terms, such as "on", "upper", "lower", "above", and "below", can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Such spatially relative terms can be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "on" or "upper" relative to other elements or features can then be oriented "below" or "lower" relative to the other elements or features. Accordingly, the spatially relative terminology can be interpreted differently depending on the orientation of the device in use or operation. The terms "on", "above", "under", and "below" are used in relation to the device as shown in the figures, and are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures were turned over, elements described as "on" or "above" relative to other elements or features would then be oriented "below" or "under" relative to the other elements or features. Accordingly, the terms "on", "above", "under", and "below" used in this application are to be interpreted in the context of the specific application in which they are used.

[0042] The terminology used in this application is for the purpose of describing various examples only and is not intended to be limiting. The use of the singular herein includes the plural unless the context clearly dictates otherwise. The use of the term "at least" with respect to a feature, a number, an operation, a component, an element, and / or the like means that the feature, the number, the operation, the component, the element, and / or the like includes at least one of the particular feature, the particular number, the particular operation, the particular component, the particular element, and / or the like.

[0043] Variations can occur in the shapes of the elements shown in the figures due to differences in the manufacturing process and / or tolerances. Thus, the examples described herein are not limited to the precise shapes shown in the figures, but include variations in shapes that would result from any of the differences in the manufacturing process and / or tolerances.

[0044] The features of the examples described in this application can be combined in various ways. In addition, although examples described in this application have a variety of configurations, other configurations are possible in accordance with the disclosure of this application.

[0045] One aspect of the disclosure is to provide an optical imaging system with a wide field of view.

[0046] In an example, the first lens of the optical imaging system refers to the lens nearest to an object (or a subject), and the sixth lens refers to the lens nearest to an imaging surface (or an image sensor). An image sensor having an imaging surface can be disposed on the imaging surface of the optical imaging system. The image sensor converts an image of an object formed on an effective imaging area of the imaging surface by the lenses of the optical imaging system into an electrical signal. In an example, the radius of curvature, the thickness, the TTL (a distance from an object side surface of the first lens to the imaging surface along an optical axis), the IMGHT (a maximum effective image height of the optical imaging system, and equal to half of a diagonal length of the effective imaging area of the imaging surface of the image sensor or half of a diagonal length of the imaging surface), and the focal length are expressed in millimeters (mm). The thickness of the lens, the gap between the lenses, and the TTL refer to a distance of the lens on the optical axis. Also, in the description of the shape of the lens, a configuration that one surface is convex means that an optical axis area of the surface is convex, and a configuration that one surface is concave means that an optical axis area of the surface is concave. Thus, even when it is described that one surface of the lens is convex, an edge of the lens can be concave. Similarly, even when it is described that one surface of the lens is concave, an edge of the lens can be convex.

[0047] The optical imaging system according to the disclosure can have a distortion characteristic of less than 2% when implementing a wide field of view. Thus, the optical imaging system according to the disclosure can reduce image quality deterioration caused by spherical aberration and distortion while capturing an image at a wide viewing angle of 100 degrees (100°) or more. For example, the optical imaging system according to the disclosure can reduce severe distortion at an image edge. Thus, a camera module including the optical imaging system according to the disclosure can omit or reduce a software operation for image correction.

[0048] The optical imaging system according to the example can include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens disposed in order from an object side. In the optical imaging system, an object side of the second lens and an object side of the third lens can be convex. The sixth lens can have a predetermined refractive power. For example, the sixth lens can have a negative refractive power. The optical imaging system can have a wide field of view. For example, a field of view (FOV) of the optical imaging system can be 100 degrees or more. The optical imaging system can have a significant distortion aberration at a maximum height of the imaging surface. For example, the optical imaging system can have a distortion aberration of less than +2% or less than -2% at the maximum height of the imaging surface. The following conditional expression shows one form of a constraint condition for representing the FOV and the distortion characteristic of the optical imaging system.

[0049] -2.0 < {IMGHT / (f*tan(FOV / 2))-1} * 100 < 2.0

[0050] In the above conditional expression, FOV is a field of view of the optical imaging system, IMGHT is half of a diagonal length of an imaging surface, and f is a focal length of the optical imaging system.

[0051] An optical imaging system according to another example can include, disposed in order from an object side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. In the optical imaging system, an object side of the second lens and an object side of the third lens can be convex. The optical imaging system can have a wide field of view. For example, a field of view (FOV) of the optical imaging system can be 100 degrees or more. The optical imaging system can have a significant distortion aberration at a maximum height of an imaging surface. For example, the optical imaging system can have a distortion aberration of less than +2% or less than -2% at the maximum height of the imaging surface. The following conditional expression shows another form of a constraint condition for representing FOV and distortion characteristics of the optical imaging system.

[0052] -2.0 < {IMGHT / (f*tan(FOV / 2))-1} * 100 < 2.0

[0053] TTL / IMGHT < 1.4

[0054] In the above conditional expression, TTL is a distance (mm) from an object side surface of the first lens to the imaging surface.

[0055] In the following description, a detailed configuration of the optical imaging system will be described.

[0056] The optical imaging system can include six lenses disposed in order from an object side in a direction of an optical axis. For example, the optical imaging system can include, disposed in order, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens to the sixth lens can be disposed at a predetermined interval. For example, a predetermined interval can be formed between an image side surface of a front lens and an object side surface of a rear lens.

[0057] The first lens can have a refractive power. For example, the first lens can have a positive refractive power or a negative refractive power. One surface of the first lens can be concave. For example, the first lens can have a concave object side surface or a concave image side surface. The first lens can include an aspheric surface. For example, both surfaces of the first lens are aspheric. An inflection point can be formed on one surface of the first lens. For example, the inflection point can be formed on the object side surface or the image side surface of the first lens. However, the inflection point is not necessarily formed on one surface of the first lens. The first lens can be formed of a material having high light transmittance and excellent workability. For example, the first lens can be manufactured using a plastic material. However, the material of the first lens is not limited to the plastic material. For example, the first lens can be manufactured using a glass material. The first lens has a predetermined refractive index. For example, the refractive index of the first lens can be greater than 1.5 to less than 1.6.

[0058] The second lens can have a refractive power. For example, the second lens can have a positive refractive power or a negative refractive power. The second lens can have a refractive power having a different sign from a sign of a refractive power of the first lens. For example, when the first lens has a positive refractive power, the second lens can have a negative refractive power. In contrast, when the first lens has a negative refractive power, the second lens can have a positive refractive power. One surface of the second lens can be convex. For example, the second lens can have a convex object-side surface. The second lens can have an aspheric surface. For example, both surfaces of the second lens can be aspheric. The second lens can be formed of a material having high light transmittance and excellent processability. For example, the second lens can be manufactured using a plastic material. However, the material of the second lens is not limited to the plastic material. For example, the second lens can be manufactured using a glass material. The second lens can have a predetermined refractive index. For example, the refractive index of the second lens can be greater than 1.5 to less than 1.7.

[0059] The third lens can have a refractive power. For example, the third lens can have a positive refractive power or a negative refractive power. One surface of the third lens can be convex. For example, the third lens can have a convex object-side surface. The third lens can have an aspheric surface. For example, both surfaces of the third lens can be aspheric. The third lens can be formed of a material having high light transmittance and excellent processability. For example, the third lens can be manufactured using a plastic material. However, the material of the third lens is not limited to the plastic material. For example, the third lens can be manufactured using a glass material. The third lens can have a predetermined refractive index. For example, the refractive index of the third lens can be greater than 1.5 to less than 1.7.

[0060] The fourth lens can have a refractive power. For example, the fourth lens can have a positive refractive power or a negative refractive power. One surface of the fourth lens can be concave. For example, the fourth lens can have a concave object-side surface. The fourth lens can have an aspheric surface. For example, both surfaces of the fourth lens can be aspheric. The fourth lens can be manufactured using a material having high light transmittance and excellent processability. For example, the fourth lens can 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 can be manufactured using a glass material. The fourth lens can have a predetermined refractive index. For example, the refractive index of the fourth lens can be greater than 1.5 to less than 1.7.

[0061] The fifth lens can have a refractive power. For example, the fifth lens can have a positive refractive power or a negative refractive power. The fifth lens can have a refractive power having a different sign from a sign of a refractive power of the fourth lens. For example, when the fourth lens has a positive refractive power, the fifth lens can have a negative refractive power. Conversely, when the fourth lens has a negative refractive power, the fifth lens can have a positive refractive power. One surface of the fifth lens can be convex. For example, the fifth lens can have a convex object side surface or a convex image side surface. The fifth lens can have an aspheric surface. For example, both surfaces of the fifth lens can be aspheric. An inflection point can be formed on one surface of the fifth lens. For example, inflection points can be formed on the object side surface and the image side surface of the fifth lens. The fifth lens can be formed of a material having high light transmittance and excellent processability. For example, the fifth lens can be manufactured using a plastic material. However, the material of the fifth lens is not limited to a plastic material. For example, the fifth lens can be manufactured using a glass material. The fifth lens can have a predetermined refractive index. For example, the refractive index of the fifth lens can be greater than 1.5 to less than 1.6.

[0062] The sixth lens can have a refractive power. For example, the sixth lens can have a negative refractive power. One surface of the sixth lens can be convex. For example, the sixth lens can have a convex object side surface. The sixth lens can have an aspheric surface. For example, both surfaces of the sixth lens can be aspheric. An inflection point can be formed on one surface of the sixth lens. For example, inflection points can be formed on the object side surface and the image side surface of the sixth lens. The sixth lens can be formed of a material having high light transmittance and excellent processability. For example, the sixth lens can be manufactured using a plastic material. However, the material of the sixth lens is not limited to a plastic material. For example, the sixth lens can be manufactured using a glass material. The sixth lens can have a predetermined refractive index. For example, the refractive index of the sixth lens can be greater than 1.5 and less than 1.65.

[0063] Each of the first lens to the sixth lens can have an aspheric surface. For example, at least one surface of the first lens to the sixth lens can be aspheric. The aspheric surface of each of the first lens to the sixth lens can be represented by Equation 1 as follows:

[0064] (Equation 1)

[0065]

[0066] In Equation 1, "c" is the reciprocal of the radius of curvature of the corresponding lens, "k" is a conic constant, "r" is the distance from a certain point on the aspheric surface of the lens to the optical axis, "A" to "H" and "J" are aspheric constants, and "Z" (or SAG) is the height in the direction of the optical axis from a certain point on the aspheric surface to the vertex of the aspheric surface.

[0067] The optical imaging system can further include a diaphragm. The diaphragm can be disposed between the first lens and the second lens, or between the second lens and the third lens. The optical imaging system can further include a filter. The filter can be configured to block light of a specific wavelength from being incident through the first lens to the sixth lens. For example, the filter can block incident light of an infrared wavelength. The optical imaging system can further include an image sensor. The image sensor can be configured to convert the optical signal into an electrical signal. The image sensor can provide an area (an imaging surface) in which an image of an object can be formed by light refracted by the lenses. For example, a surface of the image sensor can form an imaging plane. The image sensor can include a charge-coupled device (CCD), or the like.

[0068] The optical imaging system can satisfy one or more of the following conditional expressions.

[0069] 1.0 < f1 / f3 < 3.0

[0070] -1.5 < f3 / f4 < -0.7

[0071] 0.6 < |f4 / f6| < 1.8

[0072] 0.2 < f3 / f5 < 2.0

[0073] 1.3 < TTL / IMGHT < 1.4

[0074] 1.8 < fnumber < 2.3

[0075] In this document and in the above conditional expressions, f1 is a focal length of the first lens, f2 is a focal length of the second lens, f3 is a focal length of the third lens, f4 is a focal length of the fourth lens, f5 is a focal length of the fifth lens, f6 is a focal length of the sixth lens, TTL is a distance from an object side surface of the first lens to an imaging plane, and IMGHT is half of a diagonal length of the imaging plane.

[0076] In the following description, various examples of the optical imaging system will be described.

[0077] Hereinafter, an optical imaging system according to a first example will be described with reference to Figure 1 An optical imaging system according to a first example will be described.

[0078] The optical imaging system 100 can include lenses each having a refractive power. For example, the optical imaging system 100 can include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, and a sixth lens 160.

[0079] The first lens 110 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The second lens 120 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The third lens 130 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The fourth lens 140 may have negative refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 150 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The fifth lens 150 may have a shape with a curvature point. For example, a curvature point may be formed on the object-side surface and the image-side surface of the fifth lens 150. The sixth lens 160 may have 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 a curvature point. For example, a curvature point may be formed on the object-side surface and the image-side surface of the sixth lens 160.

[0080] The optical imaging system 100 may include an aperture stop ST. For example, the aperture stop ST may be disposed between the second lens 120 and the third lens 130. The optical imaging system 100 may include a filter IF. For example, the filter IF may be disposed between the sixth lens 160 and the imaging surface IP. The filter IF can block light of a specific wavelength from incident. For example, the filter IF according to the first example can block infrared light incident on the imaging surface IP.

[0081] The optical imaging system 100 presents as Figure 2 The aberration characteristics are shown in Table 1. The lens characteristics of the optical imaging system 100 are listed in Table 1, and the aspherical characteristics of the optical imaging system 100 are listed in Table 2.

[0082] Table 1

[0083]

[0084]

[0085] Table 2

[0086] Face Number S1 S2 S3 S4 S6 S7 K -2.499.E+01 -5.610.E+01 -4.792.E+00 -2.878.E+00 1.498.E+01 5.945.E+00 4th 9.832.E-02 2.811.E-01 2.174.E-01 -1.456.E-01 -6.067.E-02 4.130.E-02 6th -6.866.E-02 -8.944.E-01 -1.089.E+00 2.031.E+00 9.494.E-01 -1.421.E+00 8th 4.654.E-02 2.631.E+00 4.861.E+00 -2.563.E+01 -1.133.E+01 1.305.E+01 10th 5.972.E-02 -5.986.E+00 -1.877.E+01 2.147.E+02 8.332.E+01 -7.529.E+01 12th -3.018.E-01 1.029.E+01 5.765.E+01 -1.220.E+03 -4.077.E+02 2.910.E+02 14th 5.784.E-01 -1.325.E+01 -1.348.E+02 4.854.E+03 1.385.E+03 -7.845.E+02 16th -6.804.E-01 1.275.E+01 2.356.E+02 -1.384.E+04 -3.353.E+03 1.512.E+03 18th 5.388.E-01 -9.116.E+00 -3.048.E+02 2.858.E+04 5.859.E+03 -2.111.E+03 20th -2.961.E-01 4.801.E+00 2.895.E+02 -4.278.E+04 -7.404.E+03 2.138.E+03 22nd 1.134.E-01 -1.830.E+00 -1.988.E+02 4.593.E+04 6.699.E+03 -1.554.E+03 24th -2.971.E-02 4.894.E-01 9.591.E+01 -3.445.E+04 -4.228.E+03 7.901.E+02 26th 5.081.E-03 -8.692.E-02 -3.081.E+01 1.712.E+04 1.767.E+03 -2.666.E+02 28th -5.113.E-04 9.188.E-03 5.914.E+00 -5.068.E+03 -4.392.E+02 5.358.E+01 30th 2.296.E-05 -4.366.E-04 -5.131.E-01 6.756.E+02 4.914.E+01 -4.853.E+00 Face Number S8 S9 S10 S11 S12 S13 K 4.1728.E-01 -5.2170.E+01 -9.9000.E+01 -2.2230.E+00 -1.6821.E+01 -4.1905.E+00 4th -1.2526.E-01 -1.0374.E-01 -3.9596.E-02 -6.2950.E-02 -7.2814.E-02 -4.1414.E-02 6th 2.5403.E-02 3.0336.E-02 1.3069.E-01 1.3651.E-01 1.3846.E-02 1.1426.E-02 8th -3.7442.E-02 -1.4304.E-02 -2.7209.E-01 -1.7050.E-01 3.1226.E-03 -2.3057.E-03 10th 6.8485.E-02 1.1445.E-02 3.4143.E-01 1.4245.E-01 -3.7139.E-03 3.5016.E-04 12th -3.9811.E-02 -4.4408.E-03 -2.7678.E-01 -7.8748.E-02 1.6591.E-03 -5.2052.E-05 14th 8.6156.E-03 6.5468.E-04 1.4654.E-01 2.7723.E-02 -4.7048.E-04 9.8103.E-06 16th 0 0 -4.8202.E-02 -5.2526.E-03 9.2608.E-05 -1.8253.E-06 18th 0 0 7.6255.E-03 -2.5270.E-05 -1.3025.E-05 2.5572.E-07 20th 0 0 7.8870.E-04 3.0053.E-04 1.3172.E-06 -2.5068.E-08 22nd 0 0 -7.1261.E-04 -8.5342.E-05 -9.4949.E-08 1.6968.E-09 24th 0 0 1.7242.E-04 1.2787.E-05 4.7572.E-09 -7.8009.E-11 26th 0 0 -2.2190.E-05 -1.1352.E-06 -1.5736.E-10 2.3328.E-12 28th 0 0 1.5318.E-06 5.6651.E-08 3.0895.E-12 -4.1013.E-14 30th 0 0 -4.4712.E-08 -1.2329.E-09 -2.7268.E-14 3.2202.E-16

[0087] In the following text, reference will be made to Figure 3 Describe the optical imaging system according to the second example.

[0088] The optical imaging system 200 may include lenses, each having 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.

[0089] The first lens 210 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The second lens 220 may have negative refractive power and may have a convex object-side surface and a concave image-side surface. The third lens 230 may have positive refractive power and may have a convex object-side surface and a convex image-side surface. The fourth lens 240 may have negative refractive power and may have a concave object-side surface and a concave image-side surface. The fifth lens 250 may have positive refractive power and may have a concave object-side surface and a convex image-side surface. The fifth lens 250 may have a shape with a curvature point. For example, a curvature point may be formed on the object-side surface and the image-side surface of the fifth lens 250. The sixth lens 260 may have 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 a curvature point. For example, a curvature point may be formed on the object-side surface and the image-side surface of the sixth lens 260.

[0090] The optical imaging system 200 may include an aperture stop ST. For example, the aperture stop ST may be disposed between the second lens 220 and the third lens 230. The optical imaging system 200 may include a filter IF. For example, the filter IF may be disposed between the sixth lens 260 and the imaging surface IP. The filter IF can block light of a specific wavelength from incident. For example, the filter IF according to the second example can block infrared light incident on the imaging surface IP.

[0091] Optical imaging system 200 presents as Figure 4 The aberration characteristics are shown in Table 3. The lens characteristics of the optical imaging system 200 are listed in Table 4.

[0092] Table 3

[0093]

[0094]

[0095] Table 4

[0096] Face Number S1 S2 S3 S4 S6 S7 K -9.735.E+01 -3.095.E+01 -1.583.E+01 -8.952.E+00 6.624.E+01 6.621.E+00 4th 6.022.E-02 2.318.E-01 2.121.E-01 -1.089.E-01 -1.003.E-01 -1.287.E-02 6th -1.073.E-01 -7.448.E-01 -1.338.E+00 9.016.E-01 1.709.E+00 -1.148.E+00 8th 3.871.E-01 2.169.E+00 6.668.E+00 -1.029.E+01 -2.080.E+01 1.342.E+01 10th -9.714.E-01 -4.885.E+00 -2.629.E+01 7.357.E+01 1.569.E+02 -9.532.E+01 12th 1.653.E+00 8.350.E+00 7.595.E+01 -3.504.E+02 -7.894.E+02 4.493.E+02 14th -1.964.E+00 -1.076.E+01 -1.592.E+02 1.164.E+03 2.768.E+03 -1.471.E+03 16th 1.669.E+00 1.042.E+01 2.427.E+02 -2.771.E+03 -6.939.E+03 3.431.E+03 18th -1.028.E+00 -7.531.E+00 -2.701.E+02 4.790.E+03 1.258.E+04 -5.785.E+03 20th 4.595.E-01 4.025.E+00 2.187.E+02 -6.023.E+03 -1.653.E+04 7.062.E+03 22nd -1.478.E-01 -1.563.E+00 -1.272.E+02 5.452.E+03 1.554.E+04 -6.181.E+03 24th 3.333.E-02 4.278.E-01 5.169.E+01 -3.460.E+03 -1.018.E+04 3.779.E+03 26th -5.004.E-03 -7.809.E-02 -1.393.E+01 1.460.E+03 4.396.E+03 -1.532.E+03 28th 4.494.E-04 8.525.E-03 2.235.E+00 -3.679.E+02 -1.122.E+03 3.699.E+02 30th -1.827.E-05 -4.208.E-04 -1.616.E-01 4.188.E+01 1.277.E+02 -4.026.E+01 Face Number S8 S9 S10 S11 S12 S13 K 6.8441.E+00 0.0000.E+00 -9.6397.E+01 -1.3902.E+00 -3.0871.E+01 -3.8948.E+00 4th -2.6771.E-01 -1.4929.E-01 -3.7976.E-02 -3.3006.E-02 -9.9112.E-02 -6.9275.E-02 6th 9.7244.E-01 -1.5532.E-02 4.9147.E-02 4.9625.E-02 1.1029.E-02 3.2178.E-02 8th -6.5187.E+00 7.3596.E-01 -1.4616.E-01 -4.6451.E-02 3.0253.E-02 -9.9349.E-03 10th 2.8769.E+01 -3.3048.E+00 2.9712.E-01 2.2723.E-02 -2.9993.E-02 1.7021.E-03 12th -8.0200.E+01 8.9188.E+00 -4.1096.E-01 2.5066.E-03 1.5276.E-02 -3.0121.E-05 14th 1.3648.E+02 -1.6272.E+01 3.9819.E-01 -1.2544.E-02 -5.0119.E-03 -6.3322.E-05 16th -1.1367.E+02 2.0965.E+01 -2.7449.E-01 9.6184.E-03 1.1369.E-03 1.7741.E-05 18th -4.6055.E+01 -1.9443.E+01 1.3628.E-01 -4.1341.E-03 -1.8370.E-04 -2.7077.E-06 20th 2.5169.E+02 1.3035.E+01 -4.8953.E-02 1.1444.E-03 2.1341.E-05 2.7069.E-07 22nd -3.3157.E+02 -6.2633.E+00 1.2626.E-02 -2.1176.E-04 -1.7716.E-06 -1.8466.E-08 24th 2.4448.E+02 2.1033.E+00 -2.2814.E-03 2.6090.E-05 1.0262.E-07 8.5477.E-10 26th -1.0842.E+02 -4.6880.E-01 2.7421.E-04 -2.0543.E-06 -3.9414.E-09 -2.5733.E-11 28th 2.7121.E+01 6.2316.E-02 -1.9682.E-05 9.3357.E-08 9.0239.E-11 4.5491.E-13 30th -2.9542.E+00 -3.7388.E-03 6.3777.E-07 -1.8558.E-09 -9.3231.E-13 -3.5846.E-15

[0097] In the following text, reference will be made to Figure 5 Describe the optical imaging system according to the third example.

[0098] The optical imaging system 300 may include lenses, each having refractive power. For example, the optical imaging system 300 includes 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.

[0099] The first lens 310 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The second lens 320 can have a negative refractive power, and can have a convex object side surface and a concave image side surface. The third lens 330 can have a positive refractive power, and can have a convex object side surface and a convex image side surface. The fourth lens 340 can have a negative refractive power, and can have a concave object side surface and a concave image side surface. The fifth lens 350 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The fifth lens 350 can have a shape with an inflection point. For example, an inflection point can be formed on the object side surface and the image side surface of the fifth lens 350. The sixth lens 360 can have a negative refractive power, and can have a convex object side surface and a concave image side surface. The sixth lens 360 can have a shape with an inflection point. For example, an inflection point can be formed on the object side surface and the image side surface of the sixth lens 360.

[0100] The optical imaging system 300 can include a stop ST. For example, the stop ST can be disposed between the second lens 320 and the third lens 330. The optical imaging system 300 can include an optical filter IF. For example, the optical filter IF can be disposed between the sixth lens 360 and the imaging plane IP. The optical filter IF can block the incidence of light of a specific wavelength. For example, the optical filter IF according to the third example can block the incidence of infrared light to the imaging plane IP.

[0101] The optical imaging system 300 exhibits aberration characteristics as shown in Figure 6 Table 5. The aspheric surface characteristics of the optical imaging system 300 are listed in Table 6.

[0102] Table 5

[0103] Face Number Label Radius of Curvature Thickness / Distance Refractive Index Abbe Number Effective Radius S1 First Lens -143.7315 0.4454 1.5459 56.0948 1.7217 S2 -4.7085 0.0500 1.5667 S3 Second Lens 4.1326 0.3000 1.6440 23.5076 1.3240 S4 3.0576 0.3293 1.0987 S5 Stop Infinity 0.0829 0.9100 S6 Third Lens 51.8872 0.5788 1.5366 55.7103 0.9770 S7 -3.5038 0.3968 1.1429 S8 Fourth Lens -5.0165 0.4200 1.6769 19.2306 1.2770 S9 83.3767 0.4496 1.6203 S10 Fifth Lens -11.9515 1.0700 1.5366 55.7103 1.9689 S11 -1.6277 0.5938 2.2500 S12 Sixth Lens 2.8210 0.7211 1.5366 55.7103 3.8193 S13 1.1273 0.6259 4.3382 S14 Filter Infinity 0.2100 1.5183 64.1973 4.8067 S15 Infinity 0.6567 4.8798 S16 Imaging Surface Infinity 0.0200 5.1200

[0104] Table 6

[0105] Face Number S1 S2 S3 S4 S6 S7 K -9.900.E+01 -2.704.E+01 -1.635.E+01 -7.782.E+00 9.069.E+01 6.399.E+00 4th 4.338.E-02 2.202.E-01 1.495.E-01 -8.482.E-02 -4.272.E-02 -6.039.E-02 6th -4.152.E-02 -6.588.E-01 -9.020.E-01 3.099.E-01 4.193.E-01 -3.680.E-02 8th 1.639.E-01 1.927.E+00 4.186.E+00 -3.352.E+00 -6.912.E+00 1.087.E+00 10th -4.729.E-01 -4.452.E+00 -1.578.E+01 2.421.E+01 6.723.E+01 -1.015.E+01 12th 9.264.E-01 7.765.E+00 4.444.E+01 -1.161.E+02 -4.249.E+02 5.548.E+01 14th -1.270.E+00 -1.011.E+01 -9.192.E+01 3.875.E+02 1.835.E+03 -1.983.E+02 16th 1.247.E+00 9.796.E+00 1.396.E+02 -9.282.E+02 -5.579.E+03 4.880.E+02 18th -8.882.E-01 -7.051.E+00 -1.556.E+02 1.621.E+03 1.214.E+04 -8.473.E+02 20th 4.596.E-01 3.742.E+00 1.267.E+02 -2.068.E+03 -1.897.E+04 1.047.E+03 22nd -1.708.E-01 -1.442.E+00 -7.428.E+01 1.908.E+03 2.111.E+04 -9.153.E+02 24th 4.443.E-02 3.916.E-01 3.048.E+01 -1.239.E+03 -1.631.E+04 5.534.E+02 26th -7.670.E-03 -7.108.E-02 -8.300.E+00 5.366.E+02 8.311.E+03 -2.202.E+02 28th 7.892.E-04 7.732.E-03 1.346.E+00 -1.391.E+02 -2.510.E+03 5.185.E+01 30th -3.662.E-05 -3.811.E-04 -9.825.E-02 1.631.E+01 3.401.E+02 -5.480.E+00 Face Number S8 S9 S10 S11 S12 S13 K 2.5315.E+00 -8.3994.E+00 3.5316.E+01 -1.1411.E+00 -2.6644.E+01 -3.4149.E+00 4th -2.1113.E-01 -9.1572.E-02 2.6473.E-04 6.5968.E-03 -4.6938.E-02 -6.3480.E-02 6th 7.0295.E-01 -1.7205.E-01 -2.9070.E-02 -9.1384.E-02 -4.0735.E-02 2.2220.E-02 8th -5.5194.E+00 9.4994.E-01 -3.6259.E-02 3.2411.E-01 5.9983.E-02 -3.3105.E-03 10th 2.7490.E+01 -2.8564.E+00 1.9398.E-01 -6.6035.E-01 -4.0062.E-02 -9.1946.E-04 12th -8.9797.E+01 5.8614.E+00 -3.8099.E-01 8.5908.E-01 1.6981.E-02 6.4874.E-04 14th 2.0227.E+02 -8.5364.E+00 4.5855.E-01 -7.6038.E-01 -4.9165.E-03 -1.8203.E-04 16th -3.2342.E+02 9.0107.E+00 -3.7637.E-01 4.7322.E-01 1.0054.E-03 3.1823.E-05 18th 3.7239.E+02 -6.9611.E+00 2.1996.E-01 -2.1053.E-01 -1.4772.E-04 -3.8085.E-06 20th -3.0937.E+02 3.9349.E+00 -9.2752.E-02 6.7222.E-02 1.5668.E-05 3.2131.E-07 22nd 1.8338.E+02 -1.6093.E+00 2.8034.E-02 -1.5265.E-02 -1.1899.E-06 -1.9135.E-08 24th -7.5426.E+01 4.6367.E-01 -5.9204.E-03 2.4035.E-03 6.3149.E-08 7.8815.E-10 26th 2.0379.E+01 -8.9299.E-02 8.2884.E-04 -2.4916.E-04 -2.2248.E-09 -2.1372.E-11 28th -3.2364.E+00 1.0322.E-02 -6.9065.E-05 1.5285.E-05 4.6770.E-11 3.4330.E-13 30th 2.2738.E-01 -5.4176.E-04 2.5919.E-06 -4.2023.E-07 -4.4411.E-13 -2.4746.E-15

[0106] An optical imaging system according to a fourth example will be described with reference to Figure 7

[0107] The optical imaging system 400 can include lenses each having a refractive power. For example, the optical imaging system 400 includes 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.

[0108] ​The first lens 410 can have a negative refractive power, and can have a convex object side surface and a concave image side surface. The second lens 420 can have a positive refractive power, and can have a convex object side surface and a convex image side surface. The third lens 430 can have a negative refractive power, and can have a convex object side surface and a concave image side surface. The fourth lens 440 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The fifth lens 450 can have a negative refractive power, and can have a convex object side surface and a concave image side surface. The fifth lens 450 can have a shape with an inflection point. For example, an inflection point can be formed on the object side surface and the image side surface of the fifth lens 450. The sixth lens 460 can have a negative refractive power, and can have a convex object side surface and a concave image side surface. The sixth lens 460 can have a shape with an inflection point. For example, an inflection point can be formed on the object side surface and the image side surface of the sixth lens 460.

[0109] The optical imaging system 400 can include a stop ST. For example, the stop ST can be disposed between the first lens 410 and the second lens 420. The optical imaging system 400 can include an optical filter IF. For example, the optical filter IF can be disposed between the sixth lens 460 and the imaging plane IP. The optical filter IF can block the incidence of light of a specific wavelength. For example, the optical filter IF according to the fourth example can block the incidence of infrared light to the imaging plane IP.

[0110] The optical imaging system 400 exhibits an aberration characteristic as shown in FIG. 13. Figure 8 The lens characteristics of the optical imaging system 400 are listed in Table 7, and the aspheric surface characteristics of the optical imaging system 400 are listed in Table 8.

[0111] Table 7

[0112] Face Number Label Radius of Curvature Thickness / Distance Refractive Index Abbe Number Effective Radius S1 First Lens 30.5364 0.2600 1.5459 56.1138 1.4700 S2 6.2121 0.6694 1.2185 S3 Second Lens 3.9885 1.0695 1.5459 56.1138 0.9500 S4 -2.5329 0.1093 1.1200 S5 Third Lens 7.6667 0.2600 1.6776 19.2459 1.2467 S6 2.8571 0.8919 1.3649 S7 Fourth Lens -5.9311 0.7729 1.5459 56.1138 1.7500 S8 -2.1066 0.3313 1.9996 S9 Fifth Lens 5.2286 0.4000 1.5703 37.3571 2.5834 S10 3.7002 0.4345 3.3568 S11 Sixth Lens 1.5138 0.4502 1.6193 25.9599 3.9938 S12 1.0265 0.4340 4.2191 S13 Filter Infinity 0.2100 1.5183 64.1973 4.7516 S14 Infinity 0.6668 4.8320 S15 Imaging Surface Infinity 0.0200 5.1200

[0113] Table 8

[0114]

[0115]

[0116] An optical imaging system according to a fifth example will be described with reference to Figure 9

[0117] The optical imaging system 500 can include lenses each having a refractive power. For example, the optical imaging system 500 includes 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.

[0118] ​The first lens 510 can have a negative refractive power, and can have a convex object side surface and a concave image side surface. The second lens 520 can have a positive refractive power, and can have a convex object side surface and a convex image side surface. The third lens 530 can have a negative refractive power, and can have a convex object side surface and a concave image side surface. The fourth lens 540 can have a positive refractive power, and can have a concave object side surface and a convex image side surface. The fifth lens 550 can have a negative refractive power, and can have a convex object side surface and a concave image side surface. The fifth lens 550 can have a shape with an inflection point. For example, an inflection point can be formed on the object side surface and the image side surface of the fifth lens 550. The sixth lens 560 can have a negative refractive power, and can have a convex object side surface and a concave image side surface. The sixth lens 560 can have a shape with an inflection point. For example, an inflection point can be formed on the object side surface and the image side surface of the sixth lens 560.

[0119] The optical imaging system 500 can include a stop ST. For example, the stop ST can be disposed between the first lens 510 and the second lens 520. The optical imaging system 500 can include an optical filter IF. For example, the optical filter IF can be disposed between the sixth lens 560 and the imaging plane IP. The optical filter IF can block the incidence of light of a specific wavelength. For example, the optical filter IF according to the fifth example can block the incidence of infrared light to the imaging plane IP.

[0120] The optical imaging system 500 exhibits aberration characteristics as shown in Figure 10 Table 9, and the aspherical surface characteristics of the optical imaging system 500 are listed in Table 10.

[0121] Table 9

[0122] Face Number Label Radius of Curvature Thickness / Distance Refractive Index Abbe Number Effective Radius S1 First Lens 26.8543 0.2600 1.5459 56.1138 1.4700 S2 6.6911 0.6469 1.2287 S3 Second Lens 4.1358 1.0556 1.5459 56.1138 0.9600 S4 -2.6137 0.0935 1.1200 S5 Third Lens 6.6378 0.2600 1.6776 19.2459 1.2395 S6 2.7410 0.9337 1.3498 S7 Fourth Lens -5.7522 0.7537 1.5459 56.1138 1.7500 S8 -2.0430 0.3140 1.9966 S9 Fifth Lens 4.7954 0.4038 1.5703 37.3571 2.5562 S10 3.3664 0.5373 3.3236 S11 Sixth Lens 1.7301 0.4500 1.6193 25.9599 4.0434 S12 1.0955 0.3744 4.2712 S13 Filter Infinity 0.2100 1.5183 64.1973 4.7666 S14 Infinity 0.6705 4.8452 S15 Imaging Surface Infinity 0.0160 5.1200

[0123] Table 10

[0124]

[0125]

[0126] The optical characteristic values and the conditional expression values of the optical imaging systems according to the first to fifth examples are listed in Tables 11 and 12.

[0127] Table 11

[0128] Label First Example Second Example Third Example Fourth Example Fifth Example F-number 2.250 2.250 2.240 2.250 2.280 TTL 7.000 7.000 7.000 7.000 7.000 IMGHT 5.120 5.120 5.120 5.120 5.120 FOV 100.027 100.135 100.132 102.967 101.026 f 4.3025 4.2926 4.2930 4.0212 4.1651 f1 14.0834 8.7426 8.9069 -14.3391 -16.3982 f2 -27.9775 -20.5946 -20.4912 3.0120 3.1052 f3 4.7498 5.7278 6.1396 -6.8717 -7.0818 f4 -6.4570 -6.4150 -6.9766 5.5856 5.4151 f5 4.091 3.414 3.389 -24.525 -22.073 f6 -5.2470 -3.8402 -4.1105 -7.9617 -6.6168

[0129] Table 12

[0130]

[0131]

[0132] As described above, an optical imaging system having a field of view of 100 degrees or more and an f-number of 2.3 or less can be implemented.

[0133] While specific examples have been shown and described, it will be apparent to those skilled in the art having the benefit of this disclosure that many changes can be made in the form, details, and uses of these examples without departing from the spirit and scope of the claims and their equivalents. The examples described in this application should be understood as being illustrative only and not limiting in purpose. The description of features or aspects in each example should be understood as applicable to similar features or aspects in other examples. Proper results can still be achieved if the described techniques are performed in a different order, and / or if the components of the described systems, architectures, devices, or circuits are combined in different ways, and / or replaced or supplemented by other components or equivalents thereof. Therefore, the scope of the disclosure is not limited by the specific embodiments described but only by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are to be construed as being included in the disclosure.

Claims

1. An optical imaging system, including: The first lens has positive refractive power, a concave object-side surface, and a convex image-side surface; The second lens has negative refractive power, a convex object side, and a concave image side; The third lens has positive refractive power, a convex object side, and a convex image side; The fourth lens has negative refractive power and a concave object-side surface; The fifth lens has positive refractive power and a convex image-side surface; as well as The sixth lens has negative refractive power, a convex object-side surface, and a concave image-side surface. The first lens to the sixth lens are arranged sequentially from the object side. The optical imaging system has a total of six lenses. Wherein, at least one of the first to sixth lenses includes an aspherical surface, and in, 100° ≤ FOV -2.0 < {IMGHT / (f×tan(FOV / 2))-1}×100 < 2.0, 0.6 < |f4 / f6| < 1.8 0.2 < f3 / f5 < 2.0, and 1.3 < TTL / IMGHT < 1.4 Wherein, FOV is the field of view of the optical imaging system, IMGHT is half the diagonal length of the imaging surface, f is the focal length of the optical imaging system, f4 is the focal length of the fourth lens, f6 is the focal length of the sixth lens, f3 is the focal length of the third lens, f5 is the focal length of the fifth lens, and TTL is the distance from the object side of the first lens to the imaging surface.

2. The optical imaging system according to claim 1, wherein, The fourth lens has a convex image-side surface.

3. The optical imaging system according to claim 1, wherein, The fourth lens has a concave image-side surface.

4. The optical imaging system according to claim 1, wherein, The fifth lens has a convex object-side surface.

5. The optical imaging system according to claim 1, wherein, The fifth lens has a concave object-side surface.

6. The optical imaging system according to claim 1, wherein, 1.0 < f1 / f3 < 3.0, where f1 is the focal length of the first lens.

7. The optical imaging system according to claim 1, wherein, -1.5 < f3 / f4 < -0.

7.

8. The optical imaging system according to claim 1, wherein, 1.8 < f number < 2.

3.

9. An optical imaging system, including: The first lens has negative refractive power, a convex object side, and a concave image side; The second lens has positive refractive power, a convex object side surface, and a convex image side surface; The third lens has negative refractive power, a convex object side, and a concave image side; The fourth lens has positive refractive power, a concave object-side surface, and a convex image-side surface; The fifth lens has negative refractive power, a convex object-side surface, and a concave image-side surface; as well as The sixth lens has negative refractive power, a convex object-side surface, and a concave image-side surface. The first lens to the sixth lens are arranged sequentially from the object side. The optical imaging system has a total of six lenses. At least one of the first to sixth lenses includes an aspherical surface. The fifth lens has a refractive index greater than 1.5 and less than 1.

6. in, 100° ≤ FOV -2.0 < {IMGHT / (f×tan(FOV / 2))-1}×100 < 2.0, and 0.2 < f3 / f5 < 2.0, Wherein, FOV is the field of view of the optical imaging system, IMGHT is half the diagonal length of the imaging surface, f is the focal length of the optical imaging system, f3 is the focal length of the third lens, f5 is the focal length of the fifth lens, and TTL is the distance from the object side of the first lens to the imaging surface.

Images