Optical image capturing system

Abstract

An optical imaging system is provided. The optical imaging system includes a first lens, a second lens, a third lens, and a fourth lens arranged in order from an object side toward an imaging plane, in which the first lens may be formed of glass, and in which conditional expressions may be satisfied: 70lt; v1 and 0.8 < = OAL / f < = 0.9, where v1 is the Abbe number of the first lens, OAL is the distance from the object-side surface to the imaging surface of the first lens, and f is the total focal length of the optical imaging system.

Description

[0001] Cross - reference to related applications

[0002] This application claims the benefit of priority of Korean Patent Application No. 10 - 2023 - 0121962, filed with the Korean Intellectual Property Office on September 13, 2023, the entire disclosure of which is incorporated herein by reference for all purposes. Technical Field

[0003] The following description relates to an optical imaging system, and more particularly, to a mobile telephoto optical imaging system. Background Art

[0004] There is an increasing desire for mobile devices to have a thin form factor and a telephoto camera module with a high magnification. Since a telephoto camera module with a high magnification may require a long focal length, there may be a problem that physically, the total length of the camera module must be increased. In addition, the shape of the image side of the lens arranged close to the imaging surface may cause a flare phenomenon, which may cause deterioration of image quality. Summary of the Utility Model

[0005] The Summary of the Utility Model section is intended to introduce a selection of concepts in a brief form, and these concepts will be further described in the Detailed Description section below. The Summary of the Utility Model section is not intended to identify the key features or essential features of the claimed subject matter, nor is it intended to assist in determining the scope of the claimed subject matter.

[0006] In general, an optical imaging system includes a first lens, a second lens, a third lens, and a fourth lens arranged in order from the object side to the imaging surface, wherein the first lens is formed of glass, and wherein the conditional expression 70 < v1 and 0.8 ≤ OAL / f ≤ 0.9 is satisfied, where v1 is the Abbe number of the first lens, OAL is the distance from the object side surface of the first lens to the imaging surface, and f is the total focal length of the optical imaging system.

[0007] The first lens may have a positive refractive power and may satisfy the conditional expression: 5 < f1 < 10, where f1 is the focal length of the first lens.

[0008] The fourth lens may have a convex image side surface in the paraxial region.

[0009] The fourth lens may have a concave image side surface in the paraxial region and a convex image side surface in the peripheral region.

[0010] The conditional expression: 3 < OAL / ∑CT < 6 may be satisfied, where ∑CT is the sum of the thicknesses of the first lens to the third lens.

[0011] The first lens can be a D-shaped cut lens and satisfy the conditional expression: 0.5 < AR1 < 1.0, where AR1 is the aspect ratio of the effective diameter of the first lens.

[0012] The conditional expression: 0.4 ≤ d2 / d1 ≤ 1.0 can be satisfied, where d1 is the gap between the first lens and the second lens, and d2 is the gap between the second lens and the third lens.

[0013] The second lens can have a negative refractive power, and the second lens can have a concave object side surface in the paraxial region.

[0014] The third lens can have a positive refractive power and satisfy the conditional expression: 1.3 < |f / f2 + f / f3| ≤ 2.3, where f2 is the focal length of the second lens, and f3 is the focal length of the third lens.

[0015] The conditional expression: 0.15 < R1 / f ≤ 0.25 can be satisfied, where R1 is the radius of curvature of the object side surface of the first lens.

[0016] Generally, the optical imaging system includes a first lens, a second lens, a third lens, and a fourth lens arranged in sequence from the object side to the imaging surface, where the conditional expression: 70 < v1 and 0 < v2 - v3 < 15 is satisfied, where v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, and v3 is the Abbe number of the third lens.

[0017] The conditional expression: 0.5 ≤ D4 / D1 ≤ 0.8 can be satisfied, where D1 is the maximum effective diameter of the first lens, and D4 is the maximum effective diameter of the fourth lens.

[0018] At least one of the object side surface and the image side surface of at least one of the second lens and the fourth lens can have a concave shape.

[0019] The second lens can have a convex image side surface, and the fourth lens can have a convex image side surface.

[0020] The conditional expression: 0.8 ≤ OAL / f ≤ 0.9 can be satisfied, where OAL is the distance from the object side surface of the first lens to the imaging surface, and f is the total focal length of the optical imaging system.

[0021] The conditional expression: 0.4 ≤ BFL / f ≤ 0.6 can be satisfied, where BFL is the distance from the image side surface of the fourth lens to the imaging surface, and f is the total focal length of the optical imaging system.

[0022] According to the accompanying drawings and the following detailed description, other features and aspects will become apparent. Description of the Drawings

[0023] Figure 1A An exemplary optical imaging system according to a first embodiment is shown.

[0024] Figure 1B : is a graph showing aberration characteristics of an exemplary optical imaging system according to the first embodiment.

[0025] Figure 2A An exemplary optical imaging system according to a second embodiment is shown.

[0026] Figure 2B : is a graph showing aberration characteristics of an exemplary optical imaging system according to the second embodiment.

[0027] Figure 3A An exemplary optical imaging system according to a third embodiment is shown.

[0028] Figure 3B : is a graph showing aberration characteristics of an exemplary optical imaging system according to the third embodiment.

[0029] Figure 4A An exemplary optical imaging system according to a fourth embodiment is shown.

[0030] Figure 4B : is a graph showing aberration characteristics of an exemplary optical imaging system according to the fourth embodiment.

[0031] Figure 5A An exemplary optical imaging system according to a fifth embodiment is shown.

[0032] Figure 5B : is a graph showing aberration characteristics of an exemplary optical imaging system according to the fifth embodiment.

[0033] Fig. 6A An exemplary optical imaging system according to a sixth embodiment is shown.

[0034] Figure 6B : is a graph showing aberration characteristics of an exemplary optical imaging system according to the sixth embodiment.

[0035] Fig. 7A An exemplary optical imaging system according to a seventh embodiment is shown.

[0036] Figure 7B : is a diagram showing aberration characteristics of an exemplary optical imaging system according to the seventh embodiment.

[0037] Fig. 8A An exemplary optical imaging system according to an eighth embodiment is shown.

[0038] Figure 8B: is a diagram showing aberration characteristics of an exemplary optical imaging system according to the eighth embodiment.

[0039] Fig. 9A An exemplary optical imaging system according to a ninth embodiment is shown.

[0040] Fig. 9B : is a diagram showing aberration characteristics of an exemplary optical imaging system according to the ninth embodiment.

[0041] Fig. 10A An exemplary optical imaging system according to a tenth embodiment is shown.

[0042] Fig. 10B : is a diagram showing aberration characteristics of an exemplary optical imaging system according to the tenth embodiment.

[0043] Throughout the drawings and detailed description, unless otherwise described, the same reference numerals refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative sizes, proportions, and descriptions of elements in the drawings may be exaggerated. DETAILED DESCRIPTION

[0044] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the method, device and / or system described herein. However, various changes, modifications and equivalents of the method, device and / or system described herein will be apparent after understanding the disclosure of the application. For example, the order in the operation described herein and / or the order of the operation described herein are merely examples, and except for the order and / or the order of operations in the operation that must occur in a specific sequence, it is not limited to the order set forth herein, but can be changed, which will be apparent after understanding the disclosure of the application. As another example, except for the order and / or the order of operations in the operation that must occur in a sequence (e.g., a specific sequence), the order of operations and / or the order in the operation can be performed in parallel. In addition, for greater clarity and brevity, the description of features known after understanding the disclosure of the application can be omitted.

[0045] Although terms such as "first", "second" and "third" or A, B, (a), (b), etc. may be used herein to describe various members, components, regions, layers or portions, these members, components, regions, layers or portions are not limited by these terms. Each of these terms is not used to define, for example, the importance, sequence or order of the corresponding member, component, region, layer or portion, but is only used to distinguish the corresponding member, component, region, layer or portion from other members, components, regions, layers or portions. Therefore, without departing from the teachings of the examples described herein, the first member, first component, first region, first layer or first portion mentioned in these examples may also be referred to as the second member, second component, second region, second layer or second portion.

[0046] Throughout the specification, when a component, element or layer is described as being "on another component, element or layer," "connected to," "coupled to," or "engaged to" another component, element or layer, it may be directly "on another component, element or layer," directly "connected to," "coupled to," or "engaged to" another component, element or layer (e.g., in contact with another component, element or layer), or there may reasonably be one or more other components, elements or layers between the component, element or layer and the other component, element or layer. When a component, element or layer is described as being "directly on another component, element or layer," "directly connected to," "directly coupled to," or "directly engaged to" another component, element or layer, there are no other components, elements or layers between the component, element or layer and the other component, element or layer. Similarly, expressions such as "between" and "directly between," as well as "adjacent" and "directly adjacent" may also be interpreted as described above.

[0047] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the words "one", "an" and "the" are intended to include plural forms as well. As non-limiting examples, the words "comprise", "include" and "have" illustrate the existence of the described features, quantities, operations, components, elements and / or their combinations, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations, or the replacement existence of the replaceable features, quantities, operations, components, elements and / or their combinations. In addition, although an embodiment can set forth the words "comprise", "include" and "have" to illustrate the existence of the described features, quantities, operations, components, elements and / or their combinations, other embodiments may exist, in which one or more of the described features, quantities, operations, components, elements and / or their combinations are not present.

[0048] In the drawings attached to this specification, the thickness, size, and shape of the lens are slightly exaggerated for explanation, and the spherical shape or aspherical shape of the lens is shown only as an example and is not limited to the shown shape.

[0049] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items. The phrases "at least one of A, B, and C," etc. are intended to have separate meanings, and these phrases "at least one of A, B, and C," etc. also include examples in which one or more of A, B, and C may be present (e.g., any combination of one or more of A, B, and C), unless the corresponding description and implementation require that the list (e.g., "at least one of A, B, and C") be interpreted as having a combined meaning.

[0050] The features described herein may be embodied in different forms and should not be construed as being limited to the examples described herein. On the contrary, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application. In this article, the use of the wording "may" relative to an example or implementation (e.g., content that may be included or implemented with respect to an example or implementation) means that there is at least one example or implementation that includes or implements such a feature, and all examples or implementations are not limited thereto. The words "example" or "implementation" used herein have the same meaning (e.g., the phrase "in one example" has the same meaning as "in one implementation", and "in one or more examples" has the same meaning as "in one or more implementations").

[0051] One or more examples may provide a compact, high magnification optical imaging system.

[0052] One or more examples may also provide an optical imaging system with reduced flare.

[0053] In one or more examples, the values ​​of the radius of curvature, thickness, gap or distance, focal length, and IMG HT (1 / 2 of the diagonal length of the imaging surface) of the lens are all in mm, and the unit of the field of view (FOV) can be degrees. In addition, the thickness of the lens and the gap between the lenses can refer to the thickness and gap on the optical axis, respectively.

[0054] In one or more examples, the object side may indicate a direction in which the object is disposed, and the image side may indicate, for example, a direction in which an imaging surface on which an image is formed is disposed or a direction in which an image sensor is disposed.

[0055] In the description related to the shape of the lens in one or more examples, the disclosure that a surface is convex means that the paraxial region of the corresponding surface is convex, and the disclosure that a surface is concave means that the paraxial region of the corresponding surface is concave. Therefore, even if a surface of a lens is described as having a convex shape, the edge of the lens may be concave. Similarly, even if a surface of a lens is described as having a concave shape, the edge of the lens may have a convex shape.

[0056] The optical imaging system according to the exemplary embodiment may form part of a camera module mounted on a mobile device. For example, the mobile device may be any type of portable electronic device, such as but not limited to a mobile communication terminal, a smart phone or a tablet personal computer.

[0057] In an exemplary embodiment, the optical imaging system may include four lenses. Specifically, the optical imaging system may include a first lens, a second lens, a third lens, and a fourth lens arranged in sequence from the object side to the imaging surface.

[0058] In an example, the optical imaging system according to an exemplary embodiment may not only consist of four lenses, but may also include an image sensor that converts incident light into an electrical signal, an infrared blocking filter that blocks light in the infrared region, and an aperture that adjusts the amount of light. In an exemplary embodiment, the infrared blocking filter may be provided between the fourth lens and the image sensor, and the aperture may be provided on the image side of the second lens.

[0059] In an exemplary embodiment, the optical imaging system may include at least one glass lens. Specifically, in a non-limiting example, the first lens may be formed of glass, and the second to fourth lenses may be formed of plastic.

[0060] In addition, at least one of the first to fourth lenses may be an aspherical lens. In other words, at least one of the object side surface and the image side surface of at least one of the first to fourth lenses may be an aspherical surface. The aspherical surface of the lens is represented by the following equation 1.

[0061] Equation 1:

[0062]

[0063] In Equation 1, c represents the inverse of the radius of curvature of the lens, K represents a quadratic constant, and Y represents the distance from an arbitrary point on the aspherical surface of the lens to the optical axis. In addition, constants A to H, J, and L to P are aspherical coefficients from the fourth to thirtieth order, and Z (or SAG) is the distance between an arbitrary point on the aspherical surface and the vertex of the corresponding aspherical surface in the optical axis direction.

[0064] An exemplary optical imaging system according to an exemplary embodiment may satisfy one or more of the following conditional expressions.

[0065] Conditional expression 1: 5 <f1<10

[0066] Conditional expression 2: 70 <v1

[0067] Conditional expression 3: 0.5 <AR1<1.0

[0068] Conditional expression 4: 0.4≤d2 / d1≤1.0

[0069] Conditional expression 5: 0.5 ≤ D4 / D1 ≤ 0.8

[0070] Conditional expression 6: 1.3<|f / f2+f / f3|≤2.3

[0071] Conditional expression 7: 0.8 ≤ OAL / f ≤ 0.9

[0072] Conditional expression 8: 0.4 ≤ BFL / f ≤ 0.6

[0073] Conditional expression 9: 0.15 <R1 / f≤0.25

[0074] Conditional expression 10:0 <v2-v3<15

[0075] Conditional expression 11: 1.7 ≤ OAL / f1 ≤ 2.5

[0076] Conditional expression 12: IMG HT / R8 ≤ 0.4

[0077] Conditional Expression 13:3 <OAL / ∑CT<6

[0078] In the conditional expression, f is the total focal length of the optical imaging system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, and f3 is the focal length of the third lens. v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, and v3 is the Abbe number of the third lens. AR1 is the aspect ratio of the effective diameter of the first lens, and R1 is the radius of curvature of the object side surface of the first lens. D1 is the maximum effective diameter of the first lens, D4 is the maximum effective diameter of the fourth lens, d1 is the gap between the first lens and the second lens, d2 is the gap between the second lens and the third lens, and ∑CT is the sum of the thicknesses of the first lens to the third lens. OAL is the distance from the object side surface of the first lens to the imaging plane, BFL is the distance from the image side surface of the fourth lens to the imaging plane, IMG HT is half the diagonal length of the sensor, and R8 is the radius of curvature of the image side surface of the fourth lens.

[0079] Conditional Expression 1, Conditional Expression 9, and Conditional Expression 11 are conditional expressions that limit the focal length of the first lens formed of glass. In an example that deviates from the conditional expressions, it may be difficult to form an appropriate focal length for the telephoto camera module.

[0080] Conditional Expression 2 is a conditional expression related to the Abbe number of the first lens formed of glass, and a glass lens has a property of having a larger Abbe number than a plastic lens, and if deviating from this conditional expression, chromatic aberration correction may be difficult.

[0081] In addition, Conditional Expression 10 is a conditional expression related to the difference in Abbe numbers of the second lens and the third lens, and in an example deviating from this conditional expression, it may be difficult to correct chromatic aberration.

[0082] Conditional Expression 3 is a conditional expression indicating that the first lens is a D-cut lens (aspect ratio of the effective diameter of the first lens), and in the case of deviating from this conditional expression, the size of the camera module increases.

[0083] Conditional Expression 5 is an effective diameter ratio of the fourth lens and the first lens, and in the case of deviating from this conditional expression, it may be difficult to assemble the lenses.

[0084] Conditional Expression 4 is a ratio of the gap between the second lens and the third lens to the gap between the first lens and the second lens, and when this conditional expression is satisfied, aberrations can be reduced.

[0085] Conditional Expression 6 is a conditional expression that limits appropriate refractive powers of the second lens and the third lens, and in the case of departing from this conditional expression, it may be difficult to perform aberration correction.

[0086] Conditional Expression 7, Conditional Expression 8, and Conditional Expression 13 are conditional expressions related to the characteristics of the telephoto camera module, and in the case of deviating from the conditional expressions, it may be difficult to ensure the performance.

[0087] Conditional Expression 12 is a conditional expression related to the shape of the paraxial region of the image-side surface of the fourth lens. In the case of deviating from this conditional expression, the flare reduction effect is reduced.

[0088] Hereinafter, an optical imaging system according to exemplary embodiments will be described with reference to the accompanying drawings.

[0089] First embodiment

[0090] Figure 1A An exemplary optical imaging system according to a first embodiment is shown, and Figure 1B : is a graph showing aberration characteristics of an exemplary optical imaging system according to the first embodiment.

[0091] According to the first embodiment, the optical imaging system 100 may include a first lens 110, a second lens 120, a third lens 130 and a fourth lens 140 arranged in sequence from the object side to the imaging plane, and may also include an infrared blocking filter 150 and an image sensor 160 on the image side of the fourth lens 140.

[0092] The first lens 110 may have a positive refractive power. The object side surface and the image side surface of the first lens 110 may have a convex shape in the paraxial region. The first lens 110 may be formed of glass. The object side surface and the image side surface of the first lens 110 may be spherical. The first lens 110 may be a D-cut lens. The D-cut lens may refer to a lens whose length in a first axis direction perpendicular to the optical axis direction is longer than its length in a second axis direction perpendicular to both the optical axis direction and the first axis direction. That is, the length of the first lens 110 in the first axis direction perpendicular to the optical axis direction may be longer than the length in the second axis direction perpendicular to both the optical axis direction and the first axis direction.

[0093] The second lens 120 may have negative refractive power. The object side surface of the second lens 120 may have a concave shape in the paraxial region, and the image side surface of the second lens 120 may have a convex shape in the paraxial region. The second lens 120 may be formed of plastic. The object side surface and the image side surface of the second lens 120 may be aspherical.

[0094] The third lens 130 may have a positive refractive power. The object side surface of the third lens 130 may have a concave shape in the paraxial region, and the image side surface of the third lens 130 may have a convex shape in the paraxial region. The third lens 130 may be formed of plastic. Specifically, the third lens 130 may be formed of a plastic material having optical properties different from those of the second lens 120 (e.g., different refractive index and Abbe number). The object side surface and the image side surface of the third lens 130 may be aspherical.

[0095] The fourth lens 140 may have a negative refractive power. The object side surface of the fourth lens 140 may have a concave shape in the paraxial region, and the image side surface of the fourth lens 140 may have a convex shape in the paraxial region. The fourth lens 140 may be formed of plastic. Specifically, the fourth lens 140 may be formed of a plastic material having optical properties different from those of the third lens 130 (e.g., different refractive index and Abbe number). The object side surface and the image side surface of the fourth lens 140 may be aspherical.

[0096] Table 1 shows optical parameters and physical parameters of the optical imaging system 100 according to the first embodiment.

[0097] Table 1

[0098] Face number Radius of curvature Thickness / distance Refractive Index Abbe number Half aperture object infinity infinity 1 infinity 0.000 2 4.200 2.220 1.437 95.0 3.00 3 -275.063 2.166 2.68 4 -6.000 0.882 1.614 25.9 1.88 5 -19.338 1.408 1.70 6 -8.389 1.161 1.671 19.2 1.62 7 -8.353 0.100 1.58 8 -10.520 0.732 1.544 56.0 1.53 9 -27.472 9.431 1.56 10 infinity 0.210 1.518 64.2 4.50 11 infinity 0.791 4.50 Imaging surface infinity 3.59

[0099] Table 2 shows aspherical surface data of the optical imaging system 100 according to the first embodiment.

[0100] Table 2

[0101]

[0102] Second embodiment

[0103] Figure 2A An exemplary optical imaging system according to a second embodiment is shown, and Figure 2B : is a graph showing aberration characteristics of an exemplary optical imaging system according to the second embodiment.

[0104] According to the second embodiment, the optical imaging system 200 may include a first lens 210, a second lens 220, a third lens 230 and a fourth lens 240 arranged in sequence from the object side to the imaging surface, and may also include an infrared blocking filter 250 and an image sensor 260 on the image side of the fourth lens 240.

[0105] The first lens 210 may have a positive refractive power. The object side surface of the first lens 210 may have a convex shape in the paraxial region, and the image side surface of the first lens 210 may have a concave shape in the paraxial region. The first lens 210 may be formed of glass. The object side surface and the image side surface of the first lens 210 may be spherical. The first lens 210 may be a D-cut lens. For example, the length of the first lens 210 in a first axis direction perpendicular to the optical axis direction may be longer than the length in a second axis direction perpendicular to both the optical axis direction and the first axis direction.

[0106] The second lens 220 may have a negative refractive power. The object side surface and the image side surface of the second lens 220 may have a concave shape in the paraxial region. The second lens 220 may be formed of plastic. The object side surface and the image side surface of the second lens 220 may be aspherical.

[0107] The third lens 230 may have a positive refractive power. The object side surface of the third lens 230 may have a concave shape in the paraxial region, and the image side surface of the third lens 230 may have a convex shape in the paraxial region. The third lens 230 may be formed of plastic. Specifically, the third lens 230 may be formed of a plastic material having optical properties different from those of the second lens 220 (e.g., different refractive index and Abbe number). The object side surface and the image side surface of the third lens 230 may be aspherical.

[0108] The fourth lens 240 may have a negative refractive power. The object side surface and the image side surface of the fourth lens 240 may have a concave shape in the paraxial region. The fourth lens 240 may be formed of plastic. Specifically, the fourth lens 240 may be formed of a plastic material having optical properties different from those of the third lens 230 (e.g., different refractive index and Abbe number). The object side surface and the image side surface of the fourth lens 240 may be aspherical. In addition, the image side surface of the fourth lens 240 may include an inflection point. For example, the image side surface of the fourth lens 240 may have a concave shape in the paraxial region, and may have a convex shape in the peripheral region.

[0109] Table 3 shows optical parameters and physical parameters of the optical imaging system 200 according to the second embodiment.

[0110] Table 3

[0111] Face number Radius of curvature Thickness / distance Refractive Index Abbe number Half aperture object infinity infinity 1 infinity 0.000 2 4.028 2.153 1.497 81.6 3.00 3 33.867 2.070 2.70 4 -6.913 0.998 1.614 25.9 1.90 5 12.121 1.210 1.76 6 -10.698 0.795 1.661 20.4 1.90 7 -5.267 0.225 1.87 8 -60.936 0.610 1.544 56.0 1.85 9 30.000 10.039 1.90 10 infinity 0.210 1.518 64.2 4.50 11 infinity 1.000 4.50 Imaging surface infinity 3.59

[0112] Table 4 shows aspherical surface data of the optical imaging system 200 according to the second embodiment.

[0113] Table 4

[0114]

[0115] Third embodiment

[0116] Figure 3A An exemplary optical imaging system according to a third embodiment is shown, and Figure 3B : is a graph showing aberration characteristics of an exemplary optical imaging system according to the third embodiment.

[0117] According to the third embodiment, the optical imaging system 300 may include a first lens 310, a second lens 320, a third lens 330 and a fourth lens 340 arranged in sequence from the object side to the imaging plane, and may also include an infrared blocking filter 350 and an image sensor 360 on the image side of the fourth lens 340.

[0118] The first lens 310 may have a positive refractive power. The object side surface of the first lens 310 may have a convex shape in the paraxial region, and the image side surface of the first lens 310 may have a concave shape in the paraxial region. The first lens 310 may be formed of glass. The object side surface and the image side surface of the first lens 310 may be spherical. The first lens 310 may be a D-cut lens. For example, the length of the first lens 310 in a first axis direction perpendicular to the optical axis direction may be longer than the length in a second axis direction perpendicular to both the optical axis direction and the first axis direction.

[0119] The second lens 320 may have negative refractive power. The object side surface and the image side surface of the second lens 320 may have a concave shape in the paraxial region. The second lens 320 may be formed of plastic. The object side surface and the image side surface of the second lens 320 may be aspherical.

[0120] The third lens 330 may have a positive refractive power. The object side surface of the third lens 330 may have a concave shape in the paraxial region, and the image side surface of the third lens 330 may have a convex shape in the paraxial region. The third lens 330 may be formed of plastic. Specifically, the third lens 330 may be formed of a plastic material having optical properties different from those of the second lens 320 (e.g., different refractive index and Abbe number). The object side surface and the image side surface of the third lens 330 may be aspherical.

[0121] The fourth lens 340 may have a negative refractive power. The object side surface and the image side surface of the fourth lens 340 may have a concave shape in the paraxial region. The fourth lens 340 may be formed of plastic. Specifically, the fourth lens 340 may be formed of a plastic material having optical properties different from those of the third lens 330 (e.g., different refractive index and Abbe number). The object side surface and the image side surface of the fourth lens 340 may be aspherical. In addition, the image side surface of the fourth lens 340 may include an inflection point. For example, the image side surface of the fourth lens 340 may have a concave shape in the paraxial region, and may have a convex shape in the peripheral region.

[0122] Table 5 shows optical parameters and physical parameters of the optical imaging system 300 according to the third embodiment.

[0123] Table 5

[0124]

[0125]

[0126] Table 6 shows aspherical surface data of the optical imaging system 300 according to the third embodiment.

[0127] Table 6

[0128] Face number 2 3 4 5 6 7 8 9 K 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A 0.00E+00 0.00E+00 -5.61E-03 -7.15E-03 -2.43E-03 -3.52E-03 -1.94E-02 -1.45E-02 B 0.00E+00 0.00E+00 1.13E-03 1.16E-03 -2.87E-04 5.77E-04 3.73E-04 2.30E-03 C 0.00E+00 0.00E+00 -4.81E-04 -1.13E-03 -4.26E-04 -2.01E-04 1.31E-03 -6.65E-04 D 0.00E+00 0.00E+00 2.97E-04 8.57E-04 1.84E-04 -6.22E-05 -8.98E-04 1.41E-04 E 0.00E+00 0.00E+00 -1.09E-04 -3.42E-04 -6.64E-05 3.80E-05 2.33E-04 -1.63E-05 F 0.00E+00 0.00E+00 2.01E-05 6.64E-05 9.74E-06 -1.61E-05 -2.27E-05 6.94E-07 G 0.00E+00 0.00E+00 -1.46E-06 -4.86E-06 0.00E+00 4.85E-06 0.00E+00 0.00E+00 H 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 -7.21E-07 0.00E+00 0.00E+00 J 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 4.10E-08 0.00E+00 0.00E+00 L 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 M 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 N 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 O 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 P 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0129] Fourth embodiment

[0130] Figure 4A An exemplary optical imaging system according to a fourth embodiment is shown, and Figure 4B : is a graph showing aberration characteristics of an exemplary optical imaging system according to the fourth embodiment.

[0131] According to the fourth embodiment, the optical imaging system 400 may include a first lens 410, a second lens 420, a third lens 430 and a fourth lens 440 arranged in sequence from the object side to the imaging plane, and may also include an infrared blocking filter 450 and an image sensor 460 on the image side of the fourth lens 440.

[0132] The first lens 410 may have a positive refractive power. The object side surface of the first lens 410 may have a convex shape in the paraxial region, and the image side surface of the first lens 410 may be flat. The first lens 410 may be formed of glass. The object side surface and the image side surface of the first lens 410 may be spherical. The first lens 410 may be a D-cut lens. For example, the length of the first lens 410 in a first axis direction perpendicular to the optical axis direction may be longer than the length in a second axis direction perpendicular to both the optical axis direction and the first axis direction.

[0133] The second lens 420 may have a negative refractive power. The object side surface and the image side surface of the second lens 420 may have a concave shape in the paraxial region. The second lens 420 may be formed of plastic. The object side surface and the image side surface of the second lens 420 may be aspherical.

[0134] The third lens 430 may have a positive refractive power. The object side surface and the image side surface of the third lens 430 may have a convex shape in the paraxial region. The third lens 430 may be formed of plastic. Specifically, the third lens 430 may be formed of a plastic material having optical properties different from those of the second lens 420 (e.g., different refractive index and Abbe number). The object side surface and the image side surface of the third lens 430 may be aspherical.

[0135] The fourth lens 440 may have a negative refractive power. The object side surface of the fourth lens 440 may have a convex shape in the paraxial region, and the image side surface of the fourth lens 440 may have a concave shape in the paraxial region. The fourth lens 440 may be formed of plastic. Specifically, the fourth lens 440 may be formed of a plastic material having optical properties different from those of the third lens 430 (e.g., different refractive index and Abbe number). The object side surface and the image side surface of the fourth lens 440 may be aspherical. In addition, the image side surface of the fourth lens 440 may include an inflection point. For example, the image side surface of the fourth lens 440 may have a concave shape in the paraxial region, and may have a convex shape in the peripheral region.

[0136] Table 7 shows optical parameters and physical parameters of the optical imaging system 400 according to the fourth embodiment.

[0137] Table 7

[0138]

[0139]

[0140] Table 8 shows aspherical surface data of the optical imaging system 400 according to the fourth embodiment.

[0141] Table 8

[0142]

[0143] Fifth embodiment

[0144] Figure 5A An exemplary optical imaging system according to a fifth embodiment is shown, and Figure 5B : is a graph showing aberration characteristics of an exemplary optical imaging system according to the fifth embodiment.

[0145] According to the fifth embodiment, the optical imaging system 500 may include a first lens 510, a second lens 520, a third lens 530 and a fourth lens 540 arranged in sequence from the object side to the imaging plane, and may also include an infrared blocking filter 550 and an image sensor 560 on the image side of the fourth lens 540.

[0146] The first lens 510 may have a positive refractive power. The object side surface of the first lens 510 may have a convex shape in the paraxial region, and the image side surface of the first lens 510 may have a concave shape in the paraxial region. The first lens 510 may be formed of glass. The object side surface and the image side surface of the first lens 510 may be spherical. The first lens 510 may be a D-cut lens. For example, the length of the first lens 510 in a first axis direction perpendicular to the optical axis direction may be longer than the length in a second axis direction perpendicular to both the optical axis direction and the first axis direction.

[0147] The second lens 520 may have a negative refractive power. The object side surface and the image side surface of the second lens 520 may have a concave shape in the paraxial region. The second lens 520 may be formed of plastic. The object side surface and the image side surface of the second lens 520 may be aspherical.

[0148] The third lens 530 may have a positive refractive power. The object side surface of the third lens 530 may have a concave shape in the paraxial region, and the image side surface of the third lens 530 may have a convex shape in the paraxial region. The third lens 530 may be formed of plastic. Specifically, the third lens 530 may be formed of a plastic material having optical properties different from those of the second lens 520 (e.g., different refractive index and Abbe number). The object side surface and the image side surface of the third lens 530 may be aspherical.

[0149] The fourth lens 540 may have a negative refractive power. The object side surface of the fourth lens 540 may have a convex shape in the paraxial region, and the image side surface of the fourth lens 540 may have a concave shape in the paraxial region. The fourth lens 540 may be formed of plastic. Specifically, the fourth lens 540 may be formed of a plastic material having optical properties different from those of the third lens 530 (e.g., different refractive index and Abbe number). The object side surface and the image side surface of the fourth lens 540 may be aspherical. In addition, the image side surface of the fourth lens 540 may include an inflection point. For example, the image side surface of the fourth lens 540 may have a concave shape in the paraxial region, and may have a convex shape in the peripheral region.

[0150] Table 9 shows optical parameters and physical parameters of the optical imaging system 500 according to the fifth embodiment.

[0151] Table 9

[0152]

[0153]

[0154] Table 10 shows aspherical surface data of the optical imaging system 500 according to the fifth embodiment.

[0155] Table 10

[0156]

[0157]

[0158] Sixth Embodiment

[0159] Fig. 6A An exemplary optical imaging system according to a sixth embodiment is shown, and Figure 6B : is a graph showing aberration characteristics of an exemplary optical imaging system according to the sixth embodiment.

[0160] According to the sixth embodiment, the optical imaging system 600 may include a first lens 610, a second lens 620, a third lens 630 and a fourth lens 640 arranged in sequence from the object side to the imaging surface, and may also include an infrared blocking filter 650 and an image sensor 660 on the image side of the fourth lens 640.

[0161] The first lens 610 may have a positive refractive power. The object side surface of the first lens 610 may have a convex shape in the paraxial region, and the image side surface of the first lens 610 may have a concave shape in the paraxial region. The first lens 610 may be formed of glass. The object side surface and the image side surface of the first lens 610 may be spherical. The first lens 610 may be a D-cut lens. For example, the length of the first lens 610 in a first axis direction perpendicular to the optical axis direction may be longer than the length in a second axis direction perpendicular to both the optical axis direction and the first axis direction.

[0162] The second lens 620 may have negative refractive power. The object side surface and the image side surface of the second lens 620 may have a concave shape in the paraxial region. The second lens 620 may be formed of plastic. The object side surface and the image side surface of the second lens 620 may be aspherical.

[0163] The third lens 630 may have a positive refractive power. The object side surface of the third lens 630 may have a concave shape in the paraxial region, and the image side surface of the third lens 630 may have a convex shape in the paraxial region. The third lens 630 may be formed of plastic. Specifically, the third lens 630 may be formed of a plastic material having optical properties different from those of the second lens 620 (e.g., different refractive index and Abbe number). The object side surface and the image side surface of the third lens 630 may be aspherical.

[0164] The fourth lens 640 may have a negative refractive power. The object side surface and the image side surface of the fourth lens 640 may have a concave shape in the paraxial region. The fourth lens 640 may be formed of plastic. In detail, the fourth lens 640 may be formed of a plastic material having optical properties different from those of the third lens 630 (e.g., different refractive index and Abbe number). The object side surface and the image side surface of the fourth lens 640 may be aspherical. In addition, the image side surface of the fourth lens 640 may include an inflection point. For example, the image side surface of the fourth lens 640 may have a concave shape in the paraxial region, and may have a convex shape in the peripheral region.

[0165] Table 11 shows optical parameters and physical parameters of the optical imaging system 600 according to the sixth embodiment.

[0166] Table 11

[0167] Face number Radius of curvature Thickness / distance Refractive Index Abbe number Half Aperture object infinity infinity 1 infinity 0.000 2 4.359 2.270 1.497 81.6 2.85 3 260.033 1.723 2.52 4 -12.128 0.997 1.614 25.9 1.90 5 7.038 1.100 1.71 6 -20.183 0.950 1.661 20.4 1.88 7 -6.962 0.600 1.79 8 -18.758 0.870 1.544 56.0 1.73 9 73.509 2.420 1.86 10 infinity 0.210 1.518 64.2 2.43 11 infinity 8.170 2.46 Imaging surface infinity 4.28

[0168] Table 12 shows aspherical surface data of the optical imaging system 600 according to the sixth embodiment.

[0169] Table 12

[0170]

[0171]

[0172] Seventh embodiment

[0173] Fig. 7A An exemplary optical imaging system according to a seventh embodiment is shown, and Figure 7B : is a diagram showing aberration characteristics of an exemplary optical imaging system according to the seventh embodiment.

[0174] According to the seventh embodiment, the optical imaging system 700 may include a first lens 710, a second lens 720, a third lens 730 and a fourth lens 740 arranged in sequence from the object side to the imaging plane, and may also include an infrared blocking filter 750 and an image sensor 760 on the image side of the fourth lens 740.

[0175] The first lens 710 may have a positive refractive power. The object side surface of the first lens 710 may have a convex shape in the paraxial region, and the image side surface of the first lens 710 may have a concave shape in the paraxial region. The first lens 710 may be formed of glass. The object side surface and the image side surface of the first lens 710 may be spherical. The first lens 710 may be a D-cut lens. For example, the length of the first lens 710 in a first axis direction perpendicular to the optical axis direction may be longer than the length in a second axis direction perpendicular to both the optical axis direction and the first axis direction.

[0176] The second lens 720 may have negative refractive power. The object side surface and the image side surface of the second lens 720 may have a concave shape in the paraxial region. The second lens 720 may be formed of plastic. The object side surface and the image side surface of the second lens 720 may be aspherical.

[0177] The third lens 730 may have a positive refractive power. The object side surface of the third lens 730 may have a concave shape in the paraxial region, and the image side surface of the third lens 730 may have a convex shape in the paraxial region. The third lens 730 may be formed of plastic. Specifically, the third lens 730 may be formed of a plastic material having optical properties different from those of the second lens 720 (e.g., different refractive index and Abbe number). The object side surface and the image side surface of the third lens 730 may be aspherical.

[0178] The fourth lens 740 may have a negative refractive power. The object side surface and the image side surface of the fourth lens 740 may have a concave shape in the paraxial region. The fourth lens 740 may be formed of plastic. Specifically, the fourth lens 740 may be formed of a plastic material having optical properties different from those of the third lens 730 (e.g., different refractive index and Abbe number). The object side surface and the image side surface of the fourth lens 740 may be aspherical. In addition, the image side surface of the fourth lens 740 may include an inflection point. For example, the image side surface of the fourth lens 740 may have a concave shape in the paraxial region, and may have a convex shape in the peripheral region.

[0179] Table 13 shows optical parameters and physical parameters of the optical imaging system 700 according to the seventh embodiment.

[0180] Table 13

[0181] Face number Radius of curvature Thickness / distance Refractive Index Abbe number Half Aperture object infinity infinity 1 infinity 0.000 2 4.389 2.270 1.497 81.6 2.85 3 373.620 1.735 2.53 4 -11.879 0.988 1.615 26.0 1.90 5 7.139 1.150 1.71 6 -16.901 0.916 1.661 20.4 1.72 7 -6.454 0.650 1.78 8 -21.860 0.800 1.544 56.0 1.69 9 42.575 5.000 1.78 10 infinity 0.210 1.518 64.2 4.50 11 infinity 5.590 4.50 Imaging surface infinity 4.28

[0182] Table 14 shows aspherical surface data of the optical imaging system 700 according to the seventh embodiment.

[0183] Table 14

[0184]

[0185] Eighth Embodiment

[0186] Fig. 8A An exemplary optical imaging system according to an eighth embodiment is shown, and Figure 8B : is a diagram showing aberration characteristics of an exemplary optical imaging system according to the eighth embodiment.

[0187] According to the eighth embodiment, the optical imaging system 800 may include a first lens 810, a second lens 820, a third lens 830 and a fourth lens 840 arranged in sequence from the object side to the imaging plane, and may also include an infrared blocking filter 850 and an image sensor 860 on the image side of the fourth lens 840.

[0188] The first lens 810 may have a positive refractive power. The object side surface of the first lens 810 may have a convex shape in the paraxial region, and the image side surface of the first lens 810 may be flat. The first lens 810 may be formed of glass. The object side surface and the image side surface of the first lens 810 may be spherical. The first lens 810 may be a D-cut lens. For example, the length of the first lens 810 in a first axis direction perpendicular to the optical axis direction may be longer than the length in a second axis direction perpendicular to both the optical axis direction and the first axis direction.

[0189] The second lens 820 may have negative refractive power. The object side surface and the image side surface of the second lens 820 may have a concave shape in the paraxial region. The second lens 820 may be formed of plastic. The object side surface and the image side surface of the second lens 820 may be aspherical.

[0190] The third lens 830 may have a positive refractive power. The object side surface and the image side surface of the third lens 830 may have a convex shape in the paraxial region. The third lens 830 may be formed of plastic. Specifically, the third lens 830 may be formed of a plastic material having optical properties different from those of the second lens 820 (e.g., different refractive index and Abbe number). The object side surface and the image side surface of the third lens 830 may be aspherical.

[0191] The fourth lens 840 may have a negative refractive power. The object side surface and the image side surface of the fourth lens 840 may have a concave shape in the paraxial region. The fourth lens 840 may be formed of plastic. Specifically, the fourth lens 840 may be formed of a plastic material having optical properties different from those of the third lens 830 (e.g., different refractive index and Abbe number). The object side surface and the image side surface of the fourth lens 840 may be aspherical. In addition, the image side surface of the fourth lens 840 may include an inflection point. For example, the image side surface of the fourth lens 840 may have a concave shape in the paraxial region, and may have a convex shape in the peripheral region.

[0192] Table 15 shows optical parameters and physical parameters of the optical imaging system 800 according to the eighth embodiment.

[0193] Table 15

[0194]

[0195]

[0196] Table 16 shows aspherical surface data of the optical imaging system 800 according to the eighth embodiment.

[0197] Table 16

[0198]

[0199] Ninth embodiment

[0200] Fig. 9A An exemplary optical imaging system according to a ninth embodiment is shown, and Fig. 9B : is a diagram showing aberration characteristics of an exemplary optical imaging system according to the ninth embodiment.

[0201] According to the ninth embodiment, the optical imaging system 900 may include a first lens 910, a second lens 920, a third lens 930 and a fourth lens 940 arranged in sequence from the object side to the imaging plane, and may also include an infrared blocking filter 950 and an image sensor 960 on the image side of the fourth lens 940.

[0202] The first lens 910 may have a positive refractive power. The object side surface of the first lens 910 may have a convex shape in the paraxial region, and the image side surface of the first lens 910 may have a concave shape in the paraxial region. The first lens 910 may be formed of glass. The object side surface and the image side surface of the first lens 910 may be spherical. The first lens 910 may be a D-cut lens. For example, the length of the first lens 910 in a first axis direction perpendicular to the optical axis direction may be longer than the length in a second axis direction perpendicular to both the optical axis direction and the first axis direction.

[0203] The second lens 920 may have negative refractive power. The object side surface and the image side surface of the second lens 920 may have a concave shape in the paraxial region. The second lens 920 may be formed of plastic. The object side surface and the image side surface of the second lens 920 may be aspherical.

[0204] The third lens 930 may have a positive refractive power. The object side surface of the third lens 930 may have a concave shape in the paraxial region, and the image side surface of the third lens 930 may have a convex shape in the paraxial region. The third lens 930 may be formed of plastic. Specifically, the third lens 930 may be formed of a plastic material having optical properties different from those of the second lens 920 (e.g., different refractive index and Abbe number). The object side surface and the image side surface of the third lens 930 may be aspherical.

[0205] The fourth lens 940 may have a negative refractive power. The object side surface of the fourth lens 940 may have a convex shape in the paraxial region, and the image side surface of the fourth lens 940 may have a concave shape in the paraxial region. The fourth lens 940 may be formed of plastic. Specifically, the fourth lens 940 may be formed of a plastic material having optical properties different from those of the third lens 930 (e.g., different refractive index and Abbe number). The object side surface and the image side surface of the fourth lens 940 may be aspherical. In addition, the image side surface of the fourth lens 940 may include an inflection point. For example, the image side surface of the fourth lens 940 may have a concave shape in the paraxial region, and may have a convex shape in the peripheral region.

[0206] Table 17 shows optical parameters and physical parameters of the optical imaging system 900 according to the ninth embodiment.

[0207] Table 17

[0208]

[0209]

[0210] Table 18 shows aspherical surface data of the optical imaging system 900 according to the ninth embodiment.

[0211] Table 18

[0212]

[0213]

[0214] Tenth embodiment

[0215] Fig. 10A An exemplary optical imaging system according to a tenth embodiment is shown, and Fig. 10B is a diagram showing aberration characteristics of an exemplary optical imaging system according to a tenth embodiment of the present disclosure.

[0216] According to the tenth embodiment, the optical imaging system 1000 may include a first lens 1010, a second lens 1020, a third lens 1030 and a fourth lens 1040 arranged in sequence from the object side to the imaging plane, and may also include an infrared blocking filter 1050 and an image sensor 1060 on the image side of the fourth lens 1040.

[0217] The first lens 1010 may have a positive refractive power. The object side surface of the first lens 1010 may have a convex shape in a paraxial region, and the image side surface of the first lens 1010 may be flat. The first lens 1010 may be formed of glass. The object side surface and the image side surface of the first lens 1010 may be spherical. The first lens 1010 may be a D-cut lens. For example, the length of the first lens 1010 in a first axis direction perpendicular to the optical axis direction may be longer than the length in a second axis direction perpendicular to both the optical axis direction and the first axis direction.

[0218] The second lens 1020 may have negative refractive power. The object-side surface and the image-side surface of the second lens 1020 may have a concave shape in a paraxial region. The second lens 1020 may be formed of plastic. The object-side surface and the image-side surface of the second lens 1020 may be aspherical.

[0219] The third lens 1030 may have a positive refractive power. The object side surface and the image side surface of the third lens 1030 may have a convex shape in the paraxial region. The third lens 1030 may be formed of plastic. Specifically, the third lens 1030 may be formed of a plastic material having optical properties different from those of the second lens 1020 (e.g., different refractive index and Abbe number). The object side surface and the image side surface of the third lens 1030 may be aspherical.

[0220] The fourth lens 1040 may have a negative refractive power. The object side surface and the image side surface of the fourth lens 1040 may have a concave shape in the paraxial region. The fourth lens 1040 may be formed of plastic. Specifically, the fourth lens 1040 may be formed of a plastic material having optical properties different from those of the third lens 1030 (e.g., different refractive index and Abbe number). The object side surface and the image side surface of the fourth lens 1040 may be aspherical. In addition, the image side surface of the fourth lens 1040 may include an inflection point. For example, the image side surface of the fourth lens 1040 may have a concave shape in the paraxial region, and may have a convex shape in the peripheral region.

[0221] Table 19 shows optical parameters and physical parameters of the optical imaging system 1000 according to the tenth embodiment.

[0222] Table 19

[0223] Face number Radius of curvature Thickness / distance Refractive Index Abbe number Half aperture object infinity infinity 1 infinity 0.000 2 4.489 2.298 1.497 81.6 2.90 3 infinity 1.595 2.54 4 -18.000 1.050 1.615 26.0 1.90 5 5.774 1.140 1.70 6 16.508 1.200 1.661 20.4 1.75 7 -22.796 0.400 1.63 8 -19.081 0.682 1.544 56.0 1.62 9 68.381 9.735 1.74 10 infinity 0.210 1.518 64.2 4.50 11 infinity 1.000 4.50 Imaging surface infinity 3.59

[0224] Table 20 shows aspherical surface data of the optical imaging system 1000 according to the tenth embodiment.

[0225] Table 20

[0226]

[0227]

[0228] Table 21 shows optical parameters and physical parameters related to focal length and conditional expressions of the optical imaging system according to the exemplary embodiment.

[0229] Table 21

[0230]

[0231] The optical imaging system according to the above-described exemplary embodiments may be manufactured to be slim, and the flare phenomenon may be reduced.

[0232] 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 to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are understood in a descriptive sense only and not for limiting purposes. The description of the features or aspects in each example should be considered 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 system, architecture, device, or circuit are combined in a different manner and / or replaced or supplemented by other components or their equivalents, appropriate results can still be achieved.

[0233] Therefore, the scope of the present disclosure includes the claims and their equivalents in addition to the above disclosure and all the accompanying drawings, that is, all modifications within the scope of the claims and their equivalents should be construed as being included in the present disclosure.

Claims

1. An optical imaging system, characterized in that: The optical imaging system includes: A first lens, a second lens, a third lens, and a fourth lens arranged in sequence from the object side toward the imaging surface, wherein, the first lens is formed of glass, and wherein, the conditional expression is satisfied: 70 < v1 and 0.8 ≤ OAL / f ≤ 0.9, wherein, v1 is the Abbe number of the first lens, OAL is the distance from the object side surface of the first lens to the imaging surface, and f is the total focal length of the optical imaging system.

2. The optical imaging system according to claim 1, It is characterized in that The first lens has a positive refractive power, and wherein, the conditional expression is satisfied: 5 < f1 < 10, wherein, f1 is the focal length of the first lens.

3. The optical imaging system according to claim 1, It is characterized in that The fourth lens has a convex image side surface in the paraxial region.

4. The optical imaging system according to claim 1, It is characterized in that The fourth lens has a concave image side surface in the paraxial region and a convex image side surface in the peripheral region.

5. The optical imaging system according to claim 1, It is characterized in that The conditional expression is satisfied: 3 < OAL / ∑CT < 6, wherein, ∑CT is the sum of the thicknesses of the first lens to the third lens.

6. The optical imaging system according to claim 1, It is characterized in that The first lens is a D-shaped cutting lens, and the conditional expression is satisfied: 0.5 < AR1 < 1.0, wherein, AR1 is the aspect ratio of the effective diameter of the first lens.

7. The optical imaging system according to claim 1, It is characterized in that The conditional expression is satisfied: 0.4 ≤ d2 / d1 ≤ 1.0, wherein, d1 is the gap between the first lens and the second lens, and d2 is the gap between the second lens and the third lens.

8. The optical imaging system according to claim 1, It is characterized in that The second lens has a negative refractive power, and the second lens has a concave object side surface in the paraxial region.

9. The optical imaging system according to claim 1, It is characterized in that The third lens has a positive refractive power, and the conditional expression is satisfied: 1.3 < |f / f2 + f / f3| ≤ 2.3, wherein, f2 is the focal length of the second lens, and f3 is the focal length of the third lens.

10. The optical imaging system according to claim 1, It is characterized in that The conditional expression is satisfied: 0.15 < R1 / f ≤ 0.25, wherein, R1 is the radius of curvature of the object side surface of the first lens.

11. An optical imaging system, characterized in that The optical imaging system includes: A first lens, a second lens, a third lens, and a fourth lens arranged in sequence from the object side toward the imaging surface, wherein, the conditional expression is satisfied: 70 < v1 and 0 < v2 - v3 < 15, wherein, v1 is the Abbe number of the first lens, v2 is the Abbe number of the second lens, and v3 is the Abbe number of the third lens.

12. The optical imaging system according to claim 11, It is characterized in that The conditional expression is satisfied: 0.5 ≤ D4 / D1 ≤ 0.8, wherein, D1 is the maximum effective diameter of the first lens, and D4 is the maximum effective diameter of the fourth lens.

13. The optical imaging system according to claim 11, It is characterized in that At least one of an object-side surface and an image-side surface of at least one of the second lens and the fourth lens has a concave shape.

14. The optical imaging system according to claim 11, It is characterized in that The second lens has a convex image-side surface, and The fourth lens has a convex image-side surface.

15. The optical imaging system according to claim 11, It is characterized in that Satisfy the conditional expression: 0.8≤OAL / f≤0.9, Wherein, OAL is the distance from the object side of the first lens to the imaging plane, and f is the total focal length of the optical imaging system.

16. The optical imaging system according to claim 11, It is characterized in that Satisfy the conditional expression: 0.4≤BFL / f≤0.6, Wherein, BFL is the distance from the image side surface of the fourth lens to the imaging surface, and f is the total focal length of the optical imaging system.

Images