Optical imaging system

Abstract

An optical imaging system according to an embodiment of the present disclosure includes a first lens, a second lens, and a third lens sequentially arranged from the object side. In the optical imaging system according to the present embodiment, the air gap between the first lens and the second lens is larger than the air gap between the second lens and the third lens. In addition, in the optical imaging system according to the present embodiment, the first lens is formed of a glass material, and the length of the first lens in a first direction intersecting the optical axis is different from the length of the first lens in a second direction intersecting the optical axis.

Description

[0001] Cross - reference to related applications

[0002] This application claims the benefit of priority to Korean Patent Application Nos. 10 - 2021 - 0044410, filed on April 6, 2021, and 10 - 2021 - 0072168, filed on June 3, 2021, with the Korean Intellectual Property Office, the entire disclosures of which are incorporated herein by reference for all purposes. Technical field

[0003] The present disclosure relates to an optical imaging system including a D - cut lens. Background art

[0004] As the performance of cameras for portable terminals has been gradually enhanced, the demand and need for an optical imaging system (for telephoto imaging) with a high magnification have also increased. However, since an optical imaging system with a high magnification has a considerably large size to achieve a long focal length, it may be difficult to install in a small portable terminal (especially a thin - type terminal).

[0005] An optical imaging system including an optical path conversion device (e.g., a prism) is considered as a method for solving the above - mentioned problem. As another method for solving the above - mentioned problem, an optical imaging system including a lens (referred to as a D - cut lens) in which one side surface and another side surface opposite to the one side surface are cut is being considered. According to the latter optical imaging system, its size in the direction intersecting the optical axis (i.e., in the radial direction of the lens) can be reduced, and thus it can be applied to a thin - type terminal.

[0006] However, since the D - cut lens has different sizes in the horizontal direction (X - axis) and the vertical direction (Y - axis) of the lens, the resolution or performance of the optical imaging system may deteriorate. For example, in an optical imaging system including a D - cut lens, due to X - Y imbalance (a phenomenon in which the deformation in the X - axis and the Y - axis changes), it may be difficult to ensure the reliability regarding the optical performance.

[0007] The above information is presented only as background information to assist in understanding the present disclosure. No determination has been made, and no assertion is made as to whether any of the above constitutes prior art with respect to the present disclosure. Summary of the invention

[0008] The Summary of the Invention section is intended to introduce, in a brief form, a selection of inventive concepts, which will be further described in the Detailed Description section below. The Summary of the Invention section is not intended to identify 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.

[0009] In one general aspect, an optical imaging system includes a first lens, a second lens, and a third lens sequentially arranged from the object side, wherein the first lens has a positive refractive power, wherein the Abbe number (V1) of the first lens is greater than 70, and wherein the distance (D12) from the image side surface of the first lens to the object side surface of the second lens is 2 mm or greater.

[0010] The Abbe number of the first lens may be greater than 70 and less than 96.

[0011] The following conditional expression may be satisfied: 2.0 mm < D12 < 4.0 mm.

[0012] The focal length of the first lens may be greater than 8.0 mm and less than 16.0 mm.

[0013] The following conditional expression may be satisfied: 1.5 < f / f1 < 3.0, where f is the focal length of the optical imaging system and f1 is the focal length of the first lens.

[0014] The following conditional expression may be satisfied: 0 ≤ D12 / f ≤ 0.2, where f is the focal length of the optical imaging system.

[0015] The following conditional expression may be satisfied: 1.0 ≤ |f1 / f2| ≤ 3.0, where f1 is the focal length of the first lens and f2 is the focal length of the second lens.

[0016] The following conditional expression may be satisfied: 90 < V1 + V2, where V2 is the Abbe number of the second lens.

[0017] The effective radius of the first lens in a first direction intersecting the optical axis may be different from the effective radius in a second direction intersecting the optical axis.

[0018] The following conditional expression may be satisfied: 0.5 < ARL1 < 1.0, where ARL1 is the ratio (L1Ry / L1Rx) of the effective radius (L1Ry, minimum effective radius) of the first lens in the second direction to the effective radius (L1Rx, maximum effective radius) of the first lens in the first direction.

[0019] The following conditional expression may be satisfied: 1.3 ≤ Dmax1 / Dmax2 ≤ 2.0, where Dmax1 is the maximum effective radius of the first lens and Dmax2 is the maximum effective radius of the second lens.

[0020] The optical imaging system may further include an optical path conversion member disposed on the object side of the first lens.

[0021] The optical imaging system may further include a fourth lens sequentially arranged on the image side of the third lens, or a fourth lens and a fifth lens sequentially arranged on the image side of the third lens.

[0022] In another general aspect, an optical imaging system includes a plurality of lenses sequentially arranged with air gaps from the object side. Among the plurality of lenses, a first lens disposed closest to the object side has a positive refractive power, an Abbe number of the first lens is greater than 70, and the following conditional expression is satisfied: 0.8 < TTL / f < 1.0, where TTL is the distance from the object surface of the first lens to the imaging surface, and f is the focal length of the optical imaging system.

[0023] The following conditional expression may be satisfied: 48 < NminV - NmaxV < 76, where NminV is the Abbe number of the lens having the minimum refractive index among the plurality of lenses, and NmaxV is the Abbe number of the lens having the maximum refractive index among the plurality of lenses.

[0024] The following conditional expression may be satisfied: 8.0 mm < BFL < 18.0 mm, where BFL is the distance from the image surface of the last lens closest to the imaging surface among the plurality of lenses to the imaging surface.

[0025] The following conditional expression may be satisfied: 0.5 < CT1 / D12 < 0.9, where CT1 is the thickness at the center of the first lens along the optical axis, and D12 is the distance from the image surface of the first lens to the object surface of the second lens among the plurality of lenses.

[0026] In another general aspect, an optical imaging system includes a first lens disposed closest to the object side among a plurality of sequentially arranged lenses. The first lens has a positive refractive power, an Abbe number (V1) greater than 70, and a D-shaped cutting shape, where the effective radius in a first direction intersecting the optical axis is different from the effective radius in a second direction intersecting the optical axis, and two or more lenses among the sequentially arranged lenses are disposed on the image side of the first lens.

[0027] Other features and aspects will become apparent in accordance with the appended claims, the drawings, and the following detailed description. Description of the Drawings

[0028] Figure 1 is a configuration diagram of an optical imaging system according to a first embodiment.

[0029] Figure 2 is Figure 1 the aberration curve of the optical imaging system shown.

[0030] Figure 3It is a configuration diagram of an optical imaging system according to the second embodiment.

[0031] Figure 4 It is Figure 3 the aberration curve of the optical imaging system shown.

[0032] Figure 5 It is a configuration diagram of an optical imaging system according to the third embodiment.

[0033] Figure 6 It is Figure 5 the aberration curve of the optical imaging system shown.

[0034] Figure 7 It is a configuration diagram of an optical imaging system according to the fourth embodiment.

[0035] Figure 8 It is Figure 7 the aberration curve of the optical imaging system shown.

[0036] Figure 9 It is a configuration diagram of an optical imaging system according to the fifth embodiment.

[0037] Figure 10 It is Figure 9 the aberration curve of the optical imaging system shown.

[0038] Figure 11 It is a configuration diagram of an optical imaging system according to the sixth embodiment.

[0039] Figure 12 It is Figure 11 the aberration curve of the optical imaging system shown.

[0040] Figure 13 It is a configuration diagram of an optical imaging system according to the seventh embodiment.

[0041] Figure 14 It is Figure 13 the aberration curve of the optical imaging system shown.

[0042] Figure 15 It is a configuration diagram of an optical imaging system according to the eighth embodiment.

[0043] Figure 16 It is Figure 15 the aberration curve of the optical imaging system shown.

[0044] Figure 17 It is a configuration diagram of an optical imaging system according to the ninth embodiment.

[0045] Figure 18 It is Figure 17 the aberration curve of the optical imaging system shown.

[0046] Figure 19 It is a configuration diagram of an optical imaging system according to another embodiment of the present disclosure.

[0047] Figure 20 It is a plan view of the first lens constituting the optical imaging system according to the first to ninth embodiments.

[0048] Throughout the drawings and the detailed description, the same reference numerals refer to the same elements. For clarity, illustration, and convenience purposes, the drawings may not be drawn to scale, and the relative dimensions, proportions, and depictions of elements in the drawings may be exaggerated. Detailed Description

[0049] Hereinafter, although examples of the present disclosure will be described in detail with reference to the drawings, it should be noted that the examples are not limited thereto.

[0050] The following detailed description is provided to assist the reader in obtaining a comprehensive understanding of the methods, apparatuses, and / or systems described in this application. However, various changes, modifications, and equivalents of the methods, apparatuses, and / or systems described in this application will be apparent after understanding the present disclosure. For example, the order of operations described in this application is merely an example, and except for operations that must occur in a specific order, it is not limited to the order set forth in this application but can be changed, which will be apparent after understanding the present disclosure. Additionally, descriptions of features known in the art may be omitted for greater clarity and conciseness.

[0051] The features described in this application may be implemented in different forms and should not be construed as limited to the examples described in this application. Rather, the examples described in this application are provided merely to illustrate some of the many possible ways of implementing the methods, apparatuses, and / or systems described in this application that will be apparent after understanding the present disclosure.

[0052] Throughout the specification, when an element such as a layer, region, or substrate is described as being "on," "connected to," or "coupled to" another element, the element may be directly "on," directly "connected to," or directly "coupled to" the other element, or there may be one or more other elements between the element and the other element. Conversely, when an element is described as being "directly on," "directly connected to," or "directly coupled to" another element, there are no other elements between the element and the other element.

[0053] As used in this application, the phrase "and / or" includes any one of the associated listed items and any combination of any two or more of them; similarly, "at least one" includes any one of the associated listed items and any combination of any two or more of them.

[0054] Although the terms such as "first", "second", and "third" may be used in this application to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited by these terms. Rather, these terms are only used to distinguish one component, part, region, layer, or section from another. Thus, without departing from the teachings of the examples described in this application, the first component, first part, first region, first layer, or first section mentioned in these examples may also be referred to as the second component, second part, second region, second layer, or second section.

[0055] Spatial relative terms such as "above", "upper", "below", "lower", etc. may be used in this application for convenience of description to describe the relationship of one element relative to another as shown in the drawings. In addition to covering the orientations depicted in the drawings, these spatial relative terms are intended to also cover different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as "above" or "upper" relative to another element will be "below" or "lower" relative to that another element. Thus, depending on the spatial orientation of the device, the term "above" covers both the orientations of "above" and "below". The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used in this application should be interpreted accordingly.

[0056] The terms used in this application are only for describing various examples and are not used to limit the disclosure. Unless the context clearly indicates otherwise, the articles "a", "an", and "the" are intended to also include the plural forms. The terms "comprising", "including", and "having" specify the presence of the stated features, numbers, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, components, elements, and / or combinations thereof.

[0057] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Thus, the examples described in this application are not limited to the specific shapes shown in the drawings, but include shape variations that occur during manufacturing.

[0058] It should be noted that in this application, the term "may" is used with respect to an example, such as with respect to what an example may include or implement, meaning that there is at least one example in which such a feature is included or implemented, while not all examples are limited thereto.

[0059] The features of the examples described in this application can be combined in various ways that will be apparent after understanding the present disclosure. In addition, although the examples described in this application have various configurations, other configurations that will be apparent after understanding the present disclosure are also feasible.

[0060] The effective semi-aperture of a lens surface is the radius of the portion of the lens surface through which light actually passes, and is not necessarily the radius of the outer edge of the lens surface. The object side surface and the image side surface of the lens may have different effective semi-apertures.

[0061] In other words, the effective semi-aperture of a lens surface is the distance between the optical axis of the lens surface and the edge line of the light passing through the lens surface in a direction perpendicular to the optical axis of the lens surface.

[0062] One aspect of the present disclosure is to provide an optical imaging system configured to be miniaturized and thinned while ensuring reliability regarding optical performance.

[0063] In addition, in this specification, the first lens refers to the lens closest to the object (or subject), and the third lens, the fourth lens, or the fifth lens refers to the lens closest to the imaging surface (or image sensor). In this specification, the units of the radius of curvature, thickness, TTL (the distance along the optical axis from the object side surface of the first lens to the imaging surface), IMG_HT (half of the diagonal length of the imaging surface), and focal length are expressed in millimeters (mm). The thickness of the lens, the gap between the lenses, and the TTL refer to the distance along the optical axis of the lens. In addition, in the description of the shape of the lens, a configuration in which one surface bulges means that the optical axis region of the surface bulges, and a configuration in which one surface is recessed means that the optical axis region of the surface is recessed. Therefore, even when it is described that one surface of the lens is bulging, the edge of the lens may be recessed. Similarly, even when it is described that one surface of the lens is recessed, the edge of the lens may be bulging. In this specification, the imaging surface refers to the plane on which the lens is focused or one surface of the image sensor.

[0064] The optical imaging system may include an optical system having a plurality of lenses. For example, the optical system of the optical imaging system may include a plurality of lenses having refractive power. However, the optical imaging system is not limited to lenses having refractive power. For example, the optical imaging system may include a prism for refracting incident light and a diaphragm for adjusting the amount of light. In addition, the optical imaging system may include an infrared cut-off filter for blocking infrared rays.

[0065] The lens may be formed of a material having a refractive index different from that of air. For example, the lens may be formed of a plastic or glass material. At least one lens may have an aspherical shape. The aspherical surface of the lens may be represented by Equation 1.

[0066] Equation 1

[0067]

[0068] In Equation 1, c is the reciprocal of the radius of curvature of the corresponding lens, k is the conic constant, r is the distance from an arbitrary point on the aspherical surface to the optical axis, A to H and J are aspherical surface constants, and Z (or SAG) is the height in the optical axis direction from a certain point on the aspherical surface to the vertex of the corresponding aspherical surface.

[0069] The optical imaging system according to an embodiment of the present disclosure may include a plurality of lenses arranged in order from the object side. For example, the optical imaging system may include a first lens, a second lens, and a third lens arranged in order from the object side. The configuration of the optical imaging system is not limited to the first lens to the third lens. For example, the optical imaging system may include a first lens, a second lens, a third lens, and a fourth lens arranged in order from the object side. As another example, the optical imaging system may include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in order from the object side.

[0070] The optical imaging system according to an embodiment may include a lens having a positive refractive power. For example, the first lens may have a positive refractive power. The optical imaging system may include a lens having a large Abbe number. For example, the optical imaging system may include a lens having an Abbe number greater than 70. As a specific example, the Abbe number of the first lens in the optical imaging system may be greater than 70. In the optical imaging system, an air gap may be formed between the lenses. For example, a plurality of lenses arranged in order from the object side may be arranged so as not to contact adjacent lenses. In the optical imaging system, the air gap between the first lens and the second lens may be greater than the air gaps between other lenses. For example, the air gap between the first lens and the second lens (the distance from the image side surface of the first lens to the object side surface of the second lens) may be greater than 2.0 mm.

[0071] The optical imaging system according to another embodiment of the present disclosure may include a lens having a positive refractive power. For example, the first lens may have a positive refractive power. In addition, the optical imaging system may include a lens having a negative refractive power. For example, the second lens may have a negative refractive power. The optical imaging system may include a lens in which the object side surface is recessed. For example, the object side surface of the second lens may be recessed.

[0072] The optical imaging system according to the present specification may include lenses of different materials. For example, the optical imaging system may include a lens formed of a glass material and a lens formed of a plastic material. Compared with lenses formed of other materials, the lens formed of a glass material may have a larger Abbe number. For example, the lens formed of a glass material may have an Abbe number of 70 or greater. The lens formed of a glass material may be configured such that the length (or effective radius) in a first direction intersecting the optical axis is different from the length (or effective radius) in a second direction intersecting the optical axis. For example, the lens formed of a glass material may be manufactured in the form of cutting at least one side surface (D-shaped cutting shape). The lens formed of a glass material may be configured to have a predetermined refractive power. For example, the lens formed of a glass material may have a positive refractive power. The lens formed of a glass material may be arranged closest to the object side. For example, the first lens may be formed of a glass material.

[0073] The optical imaging system according to the present specification may include only one D-shaped cutting lens. For example, as described above, the optical imaging system may configure only the first lens formed of a glass material into a D-shaped cutting shape while being arranged closest to the object side. Therefore, the optical imaging system according to the present specification may minimize the problem of deterioration of optical performance due to the X-Y imbalance of the D-shaped cutting lens.

[0074] The optical imaging system according to the present specification may be configured such that an air gap is formed between the first lens and the second lens. For example, the air gap between the first lens and the second lens (the distance from the image side surface of the first lens to the object side surface of the second lens) may be 2.0 mm or greater. As another example, the air gap between the first lens and the second lens may be greater than the air gaps between other lenses.

[0075] The above limiting conditions may reduce the effective radius of the lens provided on the image side surface of the first lens and may minimize the influence of the X-Y imbalance of the first lens on the second lens.

[0076] The optical imaging system may satisfy one or more of the following conditional expressions:

[0077] 0 mm < f1

[0078] 70 < V1

[0079] 2 mm < D12

[0080] 0.5 mm < ARL1 < 1.0 mm

[0081] 1.5 < f / f1 < 3.0

[0082] 0 ≤ D12 / f ≤ 0.2

[0083] 1.3 ≤ Dmax1 / Dmax2 ≤ 2.0

[0084] 1.0 ≤ |f1 / f2| ≤ 3.0

[0085] 90 < V1 + V2

[0086] In the above conditional expressions, f is the 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, V1 is the Abbe number of the first lens, V2 is the Abbe number of the second lens, D12 is the distance from the image side surface of the first lens to the object side surface of the second lens, ARL1 is the ratio (L1Ry / L1Rx) between the effective radius (L1Ry or minimum effective radius) of the first lens in the short axis direction and the effective radius (L1Rx or maximum effective radius) of the first lens in the long axis direction, Dmax1 is the maximum effective radius of the first lens, and Dmax2 is the maximum effective radius of the second lens.

[0087] In addition, the optical imaging system may satisfy one or more of the following conditional expressions:

[0088] 8.0 mm < f1 < 16 mm

[0089] 70 < V1 < 96

[0090] 2.0 mm < D12 < 4.0 mm

[0091] 0.10 ≤ D12 / f ≤ 0.20

[0092] 90 < V1 + V2 < 120

[0093] 0.3 < BFL / TTL < 0.7

[0094] 8.0 mm < BFL < 18.0 mm

[0095] 0.5 < CT1 / D12 < 0.9

[0096] 48 < NminV - NmaxV < 76

[0097] 43 < V1 / Nd1 < 65

[0098] 10 < V2 / Nd2 < 38

[0099] 10 < V3 / Nd3 < 38

[0100] 0.8 < TTL / f < 1.0

[0101] In the above conditional expression, BFL is the distance from the image side of the lens closest to the imaging plane to the imaging plane, TTL is the distance from the object side of the first lens to the imaging plane, CT1 is the thickness at the center of the first lens along the optical axis, NminV is the Abbe number of the lens with the minimum refractive index, NmaxV is the Abbe number of the lens with the maximum refractive index, Nd1 is the refractive index of the first lens, Nd2 is the refractive index of the second lens, Nd3 is the refractive index of the third lens, V2 is the Abbe number of the second lens, and V3 is the Abbe number of the third lens.

[0102] Hereinafter, embodiments of the present disclosure will be described in detail based on the accompanying illustrative drawings.

[0103] First, reference will be made to Figure 1 describe an optical imaging system according to a first embodiment.

[0104] 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 order from the object side. The first lens 110 may have a positive refractive power and may have a shape with a convex object side and a convex image side. The second lens 120 may have a negative refractive power and may have a shape with a concave object side and a concave image side. The third lens 130 may have a positive refractive power and may have a shape with a convex object side and a convex image side. The fourth lens 140 may have a negative refractive power and may have a shape with a convex object side and a concave image side.

[0105] The optical imaging system 100 may include lenses formed of a plastic material and lenses formed of a glass material. For example, the first lens 110 may be formed of a glass material, and the remaining lenses may be formed of a plastic material.

[0106] The optical imaging system 100 may further include a filter IF and an imaging plane IP.

[0107] The filter IF may be disposed in front of the imaging plane IP to block infrared rays included in the incident light. The imaging plane IP may provide a space for imaging the light refracted by the lens. The imaging plane IP may be formed on the image sensor IS. For example, the imaging plane IP may be formed on one surface of the image sensor IS. The imaging plane IP does not necessarily have to be formed on the image sensor IS. For example, the imaging plane IP may be formed on any type of member or device capable of converging optical signals, such as an image film or the like.

[0108] Table 1 shows the properties of the lenses of the optical imaging system according to the present embodiment, and Table 2 shows the aspherical surface values of the optical imaging system according to the present embodiment.

[0109] Table 1

[0110]

[0111] Table 2

[0112] Surface number 2 3 4 5 6 7 8 9 K 0.000E+00 0.000E+00 -9.528E-01 -3.10E+00 0.000E+00 0.000E+00 4.005E-01 7.832E-01 A 0.000E+00 0.000E+00 3.277E-04 1.950E-04 -1.157E-03 -1.357E-03 -3.300E-03 -1.519E-03 B 0.000E+00 0.000E+00 1.257E-04 7.398E-04 1.511E-03 7.943E-04 -6.406E-04 -4.171E-04 C 0.000E+00 0.000E+00 1.648E-05 -1.509E-04 -8.219E-04 -5.222E-04 2.869E-05 -2.190E-04 D 0.000E+00 0.000E+00 -1.073E-05 4.045E-06 3.815E-04 3.042E-04 5.377E-06 1.371E-04 E 0.000E+00 0.000E+00 1.437E-06 4.971E-06 -1.246E-04 -1.192E-04 3.333E-06 -2.483E-05 F 0.000E+00 0.000E+00 0.000E+00 -4.709E-07 2.304E-05 2.593E-05 -7.272E-07 -6.995E-07 G 0.000E+00 0.000E+00 0.000E+00 5.484E-08 -1.198E-06 -1.968E-06 -2.002E-07 3.776E-07 H 0.000E+00 0.000E+00 0.000E+00 0.000E+00 -1.720E-07 -1.401E-07 1.310E-07 1.273E-07 J 0.000E+00 0.000E+00 0.000E+00 0.000E+00 1.959E-08 2.531E-08 -1.540E-08 -2.443E-08

[0113] Reference will be made to Figure 3 describe the optical imaging system according to the second embodiment.

[0114] The optical imaging system 200 may include a first lens 210, a second lens 220, and a third lens 230 arranged in order from the object side. The first lens 210 may have a positive refractive power and may have a shape with a convex object side and a concave image side. The second lens 220 may have a negative refractive power and may have a shape with a concave object side and a concave image side. The third lens 230 may have a positive refractive power and may have a shape with a convex object side and a convex image side.

[0115] The optical imaging system 200 may include lenses formed of a plastic material and lenses formed of a glass material. For example, the first lens 210 may be formed of a glass material, and the remaining lenses may be formed of a plastic material.

[0116] The optical imaging system 200 may further include a filter IF and an imaging surface IP.

[0117] The filter IF may be disposed in front of the imaging surface IP to block infrared rays included in the incident light. The imaging surface IP may provide a space for imaging the light refracted by the lens. The imaging surface IP may be formed on the image sensor IS. For example, the imaging surface IP may be formed on one surface of the image sensor IS. The imaging surface IP does not necessarily have to be formed on the image sensor IS. For example, the imaging surface IP may be formed on any type of member or device capable of converging light signals, such as an image film or the like.

[0118] Table 3 shows the attributes of the lenses of the optical imaging system according to the present embodiment, and Table 4 shows the aspherical surface values of the optical imaging system according to the present embodiment.

[0119] Table 3

[0120]

[0121] Table 4

[0122] Surface number 2 3 4 5 6 7 K 0.000E+00 0.000E+00 0.000E+00 2.509E+00 2.355E+01 2.794E-01 A 0.000E+00 0.000E+00 -7.811E-03 -1.064E-02 9.035E-04 -1.896E-03 B 0.000E+00 0.000E+00 7.713E-04 4.821E-04 7.809E-04 5.057E-04 C 0.000E+00 0.000E+00 -2.147E-05 -2.791E-04 -7.714E-04 -6.543E-04 D 0.000E+00 0.000E+00 -1.754E-05 -1.808E-05 3.735E-04 3.166E-04 E 0.000E+00 0.000E+00 2.741E-06 2.871E-06 -1.320E-04 -1.165E-04 F 0.000E+00 0.000E+00 9.233E-07 -1.943E-06 2.241E-05 2.455E-05 G 0.000E+00 0.000E+00 -1.510E-07 -3.862E-07 -7.071E-07 -2.582E-06 H 0.000E+00 0.000E+00 -6.197E-08 1.904E-07 -2.663E-07 -1.449E-08 J 0.000E+00 0.000E+00 1.164E-08 -6.499E-08 -6.562E-09 1.228E-08

[0123] Reference will be made to Figure 5 describe the optical imaging system according to the third embodiment.

[0124] 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. The first lens 310 may have a positive refractive power and may have a shape with a convex object side and a convex image side. The second lens 320 may have a negative refractive power and may have a shape with a concave object side and a concave image side. The third lens 330 may have a positive refractive power and may have a shape with a convex object side and a convex image side. The fourth lens 340 may have a positive refractive power and may have a shape with a concave object side and a convex image side.

[0125] The optical imaging system 300 may include lenses formed of a plastic material and lenses formed of a glass material. For example, the first lens 310 may be formed of a glass material, and the remaining lenses may be formed of a plastic material.

[0126] The optical imaging system 300 may further include a filter IF and an imaging surface IP.

[0127] The filter IF may be disposed in front of the imaging surface IP to block infrared rays included in the incident light. The imaging surface IP may provide a space for imaging the light refracted by the lens. The imaging surface IP may be formed on the image sensor IS. For example, the imaging surface IP may be formed on one surface of the image sensor IS. The imaging surface IP does not have to be formed on the image sensor IS. For example, the imaging surface IP may be formed on any type of member or device capable of converging light signals, such as an image film or the like.

[0128] Table 5 shows the attributes of the lenses of the optical imaging system according to the present embodiment, and Table 6 shows the aspherical surface values of the optical imaging system according to the present embodiment.

[0129] Table 5

[0130]

[0131] Table 6

[0132]

[0133]

[0134] Reference will be made to Figure 7 describe the optical imaging system according to the fourth embodiment.

[0135] The optical imaging system 400 may include a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, and a fifth lens 450 arranged in sequence from the object side. The first lens 410 may have a positive refractive power and may have a shape with a convex object side and a concave image side. The second lens 420 may have a negative refractive power and may have a shape with a concave object side and a concave image side. The third lens 430 may have a negative refractive power and may have a shape with a concave object side and a concave image side. The fourth lens 440 may have a positive refractive power and may have a shape with a concave object side and a convex image side. The fifth lens 450 may have a negative refractive power and may have a shape with a concave object side and a convex image side.

[0136] The optical imaging system 400 may include lenses formed of a plastic material and lenses formed of a glass material. For example, the first lens 410 may be formed of a glass material, and the remaining lenses may be formed of a plastic material.

[0137] The optical imaging system 400 may further include a filter IF and an imaging surface IP.

[0138] The filter IF may be disposed in front of the imaging surface IP to block infrared rays included in the incident light. The imaging surface IP may provide a space for imaging the light refracted by the lenses. The imaging surface IP may be formed on the image sensor IS. For example, the imaging surface IP may be formed on one surface of the image sensor IS. The imaging surface IP does not have to be formed on the image sensor IS. For example, the imaging surface IP may be formed on any type of member or device capable of converging light signals, such as an image film or the like.

[0139] Table 7 shows the attributes of the lenses of the optical imaging system according to the present embodiment, and Table 8 shows the aspherical surface values of the optical imaging system according to the present embodiment.

[0140] Table 7

[0141]

[0142]

[0143] Table 8

[0144] Surface number 2 3 4 5 6 K 0.00E+00 0.00E+00 3.28E+00 1.04E+01 8.71E+00 A 0.00E+00 0.00E+00 6.71E-04 -6.01E-04 -4.20E-05 B 0.00E+00 0.00E+00 7.14E-05 6.67E-04 1.35E-05 C 0.00E+00 0.00E+00 2.56E-05 -2.28E-05 3.84E-06 D 0.00E+00 0.00E+00 3.37E-06 2.86E-06 3.28E-08 E 0.00E+00 0.00E+00 -6.74E-07 4.38E-06 -1.37E-08 F 0.00E+00 0.00E+00 -1.65E-07 1.09E-06 -4.37E-08 G 0.00E+00 0.00E+00 2.56E-08 -2.43E-07 0.00E+00 H 0.00E+00 0.00E+00 -4.41E-09 -2.36E-07 0.00E+00 J 0.00E+00 0.00E+00 5.40E-10 4.27E-08 0.00E+00 Surface number 7 8 9 10 11 K -6.10E+01 0.00E+00 1.88E+01 4.56E+01 0.00E+00 A -4.18E-05 -2.06E-03 -5.19E-04 -1.12E-02 -8.87E-03 B 1.42E-05 2.82E-03 1.80E-03 -3.82E-04 4.61E-04 C 3.39E-06 -9.11E-04 -7.19E-05 4.70E-04 -5.30E-04 D 6.46E-07 4.60E-04 3.02E-04 -8.75E-05 2.23E-04 E -1.66E-07 -1.16E-04 -1.37E-04 1.50E-05 -2.67E-05 F -4.15E-08 1.66E-05 3.02E-05 -5.86E-06 -5.36E-06 G 0.00E+00 -6.94E-07 -2.02E-06 -4.42E-07 9.39E-07 H 0.00E+00 -1.22E-07 -8.31E-08 4.68E-07 1.55E-07 J 0.00E+00 7.56E-09 2.39E-08 -1.05E-08 -2.65E-08

[0145] Reference will be made to Figure 9 describe the optical imaging system according to the fifth embodiment.

[0146] The optical imaging system 500 may include a first lens 510, a second lens 520, and a third lens 530 arranged in sequence from the object side. The first lens 510 may have a positive refractive power and may have a shape that bulges on the object side and bulges on the image side. The second lens 520 may have a negative refractive power and may have a shape that is concave on the object side and bulges on the image side. The third lens 530 may have a positive refractive power and may have a shape that bulges on the object side and bulges on the image side.

[0147] The optical imaging system 500 may include lenses formed of a plastic material and lenses formed of a glass material. For example, the first lens 510 may be formed of a glass material, and the remaining lenses may be formed of a plastic material.

[0148] The optical imaging system 500 may further include a filter IF and an imaging surface IP.

[0149] The filter IF may be disposed in front of the imaging surface IP to block infrared rays included in the incident light. The imaging surface IP may provide a space for imaging the light refracted by the lens. The imaging surface IP may be formed on the image sensor IS. For example, the imaging surface IP may be formed on one surface of the image sensor IS. The imaging surface IP does not necessarily have to be formed on the image sensor IS. For example, the imaging surface IP may be formed on any type of member or device capable of converging optical signals, such as an image film or the like.

[0150] Table 9 shows the properties of the lenses of the optical imaging system according to the present embodiment, and Table 10 shows the aspherical surface values of the optical imaging system according to the present embodiment.

[0151] Table 9

[0152]

[0153] Table 10

[0154] Surface number 2 3 4 5 6 7 K 0.000E+00 0.000E+00 2.139E+00 0.000E+00 0.000E+00 -1.93E+01 A 0.000E+00 0.000E+00 4.117E-03 -2.629E-04 8.107E-04 3.976E-04 B 0.000E+00 0.000E+00 2.203E-04 -1.703E-05 1.663E-04 2.564E-04 C 0.000E+00 0.000E+00 4.423E-05 1.888E-05 -1.091E-04 -8.718E-05 D 0.000E+00 0.000E+00 -1.226E-06 1.990E-06 3.540E-05 2.624E-05 E 0.000E+00 0.000E+00 -3.830E-07 1.631E-07 -4.746E-06 -4.965E-06 F 0.000E+00 0.000E+00 1.320E-07 1.137E-07 8.162E-07 7.533E-07 G 0.000E+00 0.000E+00 2.687E-08 7.319E-08 -3.187E-09 -3.884E-08 H 0.000E+00 0.000E+00 -1.996E-09 0.000E+00 -2.132E-09 1.293E-10 J 0.000E+00 0.000E+00 4.672E-10 0.000E+00 -8.327E-11 4.167E-11

[0155] Reference will be made to Figure 11 describe the optical imaging system according to the sixth embodiment.

[0156] The optical imaging system 600 may include a first lens 610, a second lens 620, and a third lens 630 arranged in sequence from the object side. The first lens 610 may have a positive refractive power and may have a shape that bulges on the object side and bulges on the image side. The second lens 620 may have a negative refractive power and may have a shape that is concave on the object side and concave on the image side. The third lens 630 may have a positive refractive power and may have a shape that bulges on the object side and bulges on the image side.

[0157] The optical imaging system 600 may include lenses formed of a plastic material and lenses formed of a glass material. For example, the first lens 610 may be formed of a glass material, and the remaining lenses may be formed of a plastic material.

[0158] The optical imaging system 600 may further include a filter IF and an imaging surface IP.

[0159] The filter IF may be disposed in front of the imaging surface IP to block infrared rays included in the incident light. The imaging surface IP may provide a space for imaging the light refracted by the lenses. The imaging surface IP may be formed on the image sensor IS. For example, the imaging surface IP may be formed on one surface of the image sensor IS. The imaging surface IP does not necessarily have to be formed on the image sensor IS. For example, the imaging surface IP may be formed on any type of member or device capable of converging optical signals, such as an image film or the like.

[0160] Table 11 shows the properties of the lenses of the optical imaging system according to the present embodiment, and Table 12 shows the aspherical surface values of the optical imaging system according to the present embodiment.

[0161] Table 11

[0162]

[0163] Table 12

[0164]

[0165]

[0166] Reference will be made to Figure 13 describe the optical imaging system according to the seventh embodiment.

[0167] 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 order from the object side. The first lens 710 may have a positive refractive power and may have a shape with a convex object side and a convex image side. The second lens 720 may have a negative refractive power and may have a shape with a concave object side and a concave image side. The third lens 730 may have a positive refractive power and may have a shape with a convex object side and a convex image side. The fourth lens 740 may have a negative refractive power and may have a shape with a concave object side and a concave image side.

[0168] The optical imaging system 700 may include lenses formed of a plastic material and lenses formed of a glass material. For example, the first lens 710 may be formed of a glass material, and the remaining lenses may be formed of a plastic material.

[0169] The optical imaging system 700 may further include a filter IF and an imaging plane IP.

[0170] The filter IF may be disposed in front of the imaging plane IP to block infrared rays included in the incident light. The imaging plane IP may provide a space for imaging the light refracted by the lens. The imaging plane IP may be formed on the image sensor IS. For example, the imaging plane IP may be formed on one surface of the image sensor IS. The imaging plane IP does not necessarily have to be formed on the image sensor IS. For example, the imaging plane IP may be formed on any type of member or device capable of converging optical signals, such as an image film or the like.

[0171] Table 13 shows the properties of the lenses of the optical imaging system according to the present embodiment, and Table 14 shows the aspherical surface values of the optical imaging system according to the present embodiment.

[0172] Table 13

[0173]

[0174]

[0175] Table 14

[0176] Surface number 2 3 4 5 6 7 8 9 K 0.00E+00 0.00E+00 -2.18E-01 -7.72E-01 0.00E+00 0.00E+00 -1.72E+01 1.07E+02 A 0.00E+00 0.00E+00 5.40E-06 1.25E-03 -1.94E-03 -1.88E-03 8.50E-04 2.05E-03 B 0.00E+00 0.00E+00 1.12E-04 7.44E-04 1.12E-03 7.37E-04 1.34E-04 1.13E-04 C 0.00E+00 0.00E+00 -2.63E-05 -1.57E-04 -8.07E-04 -6.00E-04 4.28E-06 -2.26E-04 D 0.00E+00 0.00E+00 2.28E-07 3.03E-06 3.70E-04 3.06E-04 -8.53E-07 1.40E-04 E 0.00E+00 0.00E+00 3.25E-07 4.14E-07 -1.28E-04 -1.19E-04 -4.40E-07 -3.00E-05 F 0.00E+00 0.00E+00 0.00E+00 1.77E-07 2.27E-05 2.53E-05 -1.18E-07 -2.01E-06 G 0.00E+00 0.00E+00 0.00E+00 3.02E-08 -1.16E-06 -2.08E-06 3.18E-08 1.01E-06 H 0.00E+00 0.00E+00 0.00E+00 0.00E+00 -1.78E-07 -1.23E-07 4.20E-09 1.12E-07 J 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2.10E-08 2.50E-08 -5.47E-11 -3.45E-08

[0177] Reference will be made to Figure 15 describe the optical imaging system according to the eighth embodiment.

[0178] 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 order from the object side. The first lens 810 may have a positive refractive power and may have a shape with a convex object side and a convex image side. The second lens 820 may have a negative refractive power and may have a shape with a concave object side and a concave image side. The third lens 830 may have a negative refractive power and may have a shape with a concave object side and a concave image side. The fourth lens 840 may have a positive refractive power and may have a shape with a convex object side and a convex image side.

[0179] The optical imaging system 800 may include lenses formed of a plastic material and lenses formed of a glass material. For example, the first lens 810 may be formed of a glass material, and the remaining lenses may be formed of a plastic material.

[0180] The optical imaging system 800 may further include a filter IF and an imaging plane IP.

[0181] The filter IF can be disposed in front of the imaging plane IP to block infrared rays included in the incident light. The imaging plane IP can provide a space for imaging the light refracted by the lens. The imaging plane IP can be formed on the image sensor IS. For example, the imaging plane IP can be formed on one surface of the image sensor IS. The imaging plane IP does not necessarily have to be formed on the image sensor IS. For example, the imaging plane IP can be formed on any type of member or device capable of converging optical signals, such as an image film or the like.

[0182] Table 15 shows the properties of the lenses of the optical imaging system according to the present embodiment, and Table 16 shows the aspherical surface values of the optical imaging system according to the present embodiment.

[0183] Table 15

[0184]

[0185] Table 16

[0186] Surface number 2 3 4 5 6 7 8 9 K 0.00E+00 0.00E+00 -2.18E-01 -7.72E-01 0.00E+00 -1.72E+01 0.00E+00 0.00E+00 A 0.00E+00 0.00E+00 5.40E-06 4.70E-04 -3.89E-03 -1.24E-02 -7.56E-03 1.94E-03 B 0.00E+00 0.00E+00 1.12E-04 5.66E-04 -4.30E-04 -4.20E-03 -5.72E-03 -1.12E-03 C 0.00E+00 0.00E+00 -2.63E-05 -2.15E-04 1.49E-04 3.43E-03 5.84E-03 8.07E-04 D 0.00E+00 0.00E+00 2.28E-07 -9.60E-06 -1.52E-04 -8.86E-04 -2.84E-03 -3.70E-04 E 0.00E+00 0.00E+00 3.25E-07 -1.94E-07 2.89E-05 -1.40E-04 7.96E-04 1.28E-04 F 0.00E+00 0.00E+00 0.00E+00 1.99E-07 1.67E-06 1.71E-04 -7.15E-05 -2.27E-05 G 0.00E+00 0.00E+00 0.00E+00 -5.02E-08 -1.23E-06 -4.44E-05 -1.78E-05 1.16E-06 H 0.00E+00 0.00E+00 0.00E+00 -1.25E-17 -1.12E-07 3.88E-06 4.67E-06 1.78E-07 J 0.00E+00 0.00E+00 0.00E+00 -3.92E-19 3.45E-08 5.47E-11 -2.99E-07 -2.10E-08

[0187] Reference will be made to Figure 17 describe the optical imaging system according to the ninth embodiment.

[0188] 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 order from the object side. The first lens 910 may have a positive refractive power and may have a shape with a convex object side and a concave image side. The second lens 920 may have a negative refractive power and may have a shape with a concave object side and a concave image side. The third lens 930 may have a positive refractive power and may have a shape with a convex object side and a convex image side. The fourth lens 940 may have a negative refractive power and may have a shape with a convex object side and a concave image side.

[0189] The optical imaging system 900 may include lenses formed of a plastic material and lenses formed of a glass material. For example, the first lens 910 may be formed of a glass material, and the remaining lenses may be formed of a plastic material.

[0190] The optical imaging system 900 may further include a filter IF and an imaging plane IP.

[0191] The filter IF can be disposed in front of the imaging plane IP to block infrared rays included in the incident light. The imaging plane IP can provide a space for imaging the light refracted by the lens. The imaging plane IP can be formed on the image sensor IS. For example, the imaging plane IP can be formed on one surface of the image sensor IS. The imaging plane IP does not necessarily have to be formed on the image sensor IS. For example, the imaging plane IP can be formed on any type of member or device capable of converging optical signals, such as an image film or the like.

[0192] Table 17 shows the properties of the lenses of the optical imaging system according to the present embodiment, and Table 18 shows the aspherical surface values of the optical imaging system according to the present embodiment.

[0193] Table 17

[0194]

[0195] Table 18

[0196] Surface 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 4.00E-01 7.83E-01 A 0.00E+00 0.00E+00 -5.01E-03 -6.64E-03 -1.16E-03 -1.36E-03 -3.30E-03 -1.52E-03 B 0.00E+00 0.00E+00 7.89E-04 1.50E-03 1.51E-03 7.94E-04 -6.41E-04 -4.17E-04 C 0.00E+00 0.00E+00 9.71E-05 -1.50E-04 -8.22E-04 -5.22E-04 2.87E-05 -2.19E-04 D 0.00E+00 0.00E+00 -7.19E-05 -1.74E-05 3.82E-04 3.04E-04 5.38E-06 1.37E-04 E 0.00E+00 0.00E+00 1.33E-05 6.09E-06 -1.25E-04 -1.19E-04 3.33E-06 -2.48E-05 F 0.00E+00 0.00E+00 -8.27E-07 0.00E+00 2.30E-05 2.59E-05 -7.27E-07 -7.00E-07 G 0.00E+00 0.00E+00 0.00E+00 0.00E+00 -1.20E-06 -1.97E-06 -2.00E-07 3.78E-07 H 0.00E+00 0.00E+00 0.00E+00 0.00E+00 -1.72E-07 -1.40E-07 1.31E-07 1.27E-07 J 0.00E+00 0.00E+00 0.00E+00 0.00E+00 1.96E-08 2.53E-08 -1.54E-08 -2.44E-08

[0197] Table 19 shows the optical characteristic values of the optical imaging systems according to the first to ninth embodiments. For reference, in Table 18, ih is the diagonal length of the upper surface.

[0198] Table 19

[0199]

[0200] Tables 20 and 21 show the conditional expression values of the optical imaging systems according to the first to ninth embodiments.

[0201] Table 20

[0202] Condition expression First embodiment Second embodiment Third embodiment Fourth embodiment Fifth embodiment f1 10.912 12.511 10.039 10.911 13.891 V1 81.600 90.200 81.600 81.600 90.200 D12 2.985 3.147 3.210 2.870 3.752 ARL1 0.733 0.700 0.688 0.767 0.800 BFL 15.496 16.636 14.113 14.185 15.281 f / f1 2.493 2.174 2.690 2.475 1.800 D12 / f 0.110 0.116 0.119 0.106 0.150 Dmax1 / Dmax2 1.579 1.579 1.781 1.586 1.549 |f1 / f2| 2.318 2.243 2.321 1.362 1.610 V1 + V2 105.100 113.700 103.100 105.100 113.700 CT1 / D12 0.672 0.636 0.617 0.697 0.705 BFL / TTL 0.426 0.690 0.375 0.617 0.624 BFL / f 0.378 0.611 0.330 0.568 0.611 NminV - NmaxV 61.200 69.800 61.200 61.200 69.800 V1 / Nd1 54.509 61.823 54.509 54.509 61.823 V2 / Nd2 14.338 14.338 13.030 14.338 14.338 V3 / Nd3 12.282 12.282 12.282 36.269 12.282 TTL / f 0.8872 0.8860 0.8802 0.9210 0.9800

[0203] Table 21

[0204] Condition expression Sixth embodiment Seventh embodiment Eighth embodiment Ninth embodiment f1 11.441 10.696 10.696 10.939 V1 70.400 81.600 81.600 81.600 D12 3.146 2.837 2.837 3.247 ARL1 0.667 0.767 0.667 0.733 BFL 15.972 15.167 16.201 15.485 f / f1 2.360 2.543 2.412 2.487 D12 / f 0.117 0.104 0.110 0.119 Dmax1 / Dmax2 1.533 1.579 1.579 1.579 |f1 / f2| 1.932 2.111 2.007 2.166 V1 + V2 93.900 101.000 105.100 105.100 CT1 / D12 0.841 0.707 0.707 0.594 BFL / TTL 0.630 0.425 0.449 0.426 BFL / f 0.592 0.370 0.430 0.378 NminV - NmaxV 50.000 62.200 61.200 61.200 V1 / Nd1 47.344 54.509 54.509 54.509 V2 / Nd2 14.338 11.610 14.338 14.338 V3 / Nd3 12.282 36.547 14.618 12.282 TTL / f 0.9382 0.8697 0.9570 0.8872

[0205] The optical imaging systems 100, 200, 300, 400, 500, 600, 700, 800, and 900 according to the first to ninth embodiments may further include components such as Figure 19 shown optical path conversion members. For example, the optical imaging systems 100, 200, 300, 400, 500, 600, 700, 800, and 900 may further include a prism P. The prism P can be disposed on the object side of the first lens. The arrangement of the prism P is not limited to the object side of the first lens.

[0206] The optical imaging systems 100, 200, 300, 400, 500, 600, 700, 800, and 900 according to the first to ninth embodiments may include a D-shaped cutting lens. For example, as Figure 20 shown, the first lenses 110, 210, 310, 410, 510, 610, 710, 810, and 910 of the optical imaging systems 100, 200, 300, 400, 500, 600, 700, 800, and 900 according to the first to ninth embodiments may be configured such that the length L1Rx in a first direction intersecting the optical axis is different from the length L1Ry in a second direction intersecting the optical axis. More specifically, in the first lenses 110, 210, 310, 410, 510, 610, 710, 810, and 910, the length L1Rx in the first direction may be longer than the length L1Ry in the second direction.

[0207] The present disclosure may provide an optical imaging system capable of improving the reliability regarding optical performance.

[0208] In addition, the present disclosure may provide an optical imaging system having a high magnification.

[0209] Although specific exemplary embodiments have been shown and described above, it will be apparent after understanding the present disclosure that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described in this application should be understood only in a descriptive sense and not for the purpose of limitation. The description of the features or aspects in each example should be understood as applicable to similar features or aspects in other examples. Appropriate results can still be achieved 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. Therefore, the scope of the present disclosure is not limited by the specific embodiments, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in the present disclosure.

Claims

1. An optical imaging system, comprising: a first lens, a second lens, a third lens, and a fourth lens arranged in sequence from the object side, wherein the first lens has a positive refractive power and a convex object side surface, the second lens has a negative refractive power and a concave object side surface and a concave image side surface, the third lens has a positive refractive power and a convex object side surface and a convex image side surface, and the fourth lens has a refractive power, wherein the Abbe number of the first lens is greater than 70, wherein the distance from the image side surface of the first lens to the object side surface of the second lens is 2 mm or greater, wherein the optical imaging system satisfies the conditional expressions: 1.5 < f / f1 < 3.0, 0.8 < TTL / f < 1.0, and 0.5 < CT1 / D12 < 0.9, where f is the focal length of the optical imaging system, f1 is the focal length of the first lens, TTL is the distance from the object side surface of the first lens to the imaging surface, CT1 is the thickness at the center of the first lens along the optical axis, and D12 is the distance from the image side surface of the first lens to the object side surface of the second lens, and wherein the optical imaging system has a total of four lenses.

2. The optical imaging system according to claim 1, wherein the Abbe number of the first lens is greater than 70 and less than 96.

3. The optical imaging system according to claim 1, wherein the following conditional expressions are satisfied: 2.0 mm < D12 < 4.0 mm.

4. The optical imaging system according to claim 1, wherein the focal length of the first lens is greater than 8.0 mm and less than 16.0 mm.

5. The optical imaging system according to claim 1, wherein the following conditional expressions are satisfied: 0.3 < BFL / TTL < 0.7, where BFL is the distance from the image side surface of the fourth lens to the imaging surface.

6. The optical imaging system according to claim 1, wherein the following conditional expressions are satisfied: 0 ≤ D12 / f ≤ 0.

2.

7. The optical imaging system according to claim 1, wherein the following conditional expressions are satisfied: 1.0 ≤ f1 / f2 ≤ 3.0, where f2 is the focal length of the second lens.

8. The optical imaging system according to claim 1, wherein the following conditional expressions are satisfied: 90 < V1 + V2, where V1 is the Abbe number of the first lens, and V2 is the Abbe number of the second lens.

9. The optical imaging system according to claim 1, wherein the effective radius of the first lens in a first direction intersecting the optical axis is different from the effective radius in a second direction intersecting the optical axis.

10. The optical imaging system according to claim 9, wherein the following conditional expressions are satisfied: 0.5 < ARL1 < 1.0, Wherein, ARL1 is the ratio between the effective radius of the first lens in the second direction and the effective radius of the first lens in the first direction. The effective radius of the first lens in the second direction is the minimum effective radius of the first lens, and the effective radius of the first lens in the first direction is the maximum effective radius of the first lens.

11. The optical imaging system according to claim 1, wherein, the following conditional expression is satisfied: 1.3 ≤ Dmax1 / Dmax2 ≤ 2.0, wherein, Dmax1 is the maximum effective radius of the first lens, and Dmax2 is the maximum effective radius of the second lens.

12. The optical imaging system according to claim 1, further comprising an optical path conversion member disposed on the object side of the first lens.

13. The optical imaging system according to claim 1, wherein, the following conditional expression is satisfied: 43 < V1 / Nd1 < 65, wherein, V1 is the Abbe number of the first lens, and Nd1 is the refractive index of the first lens.

14. An optical imaging system, comprising: a first lens having positive refractive power and a convex object side; a second lens having negative refractive power and a concave object side and a concave image side; a third lens having positive refractive power and a convex object side and a convex image side; and a fourth lens having refractive power, wherein, the first lens, the second lens, the third lens and the fourth lens are arranged in sequence from the object side with an air gap therebetween, wherein, the Abbe number of the first lens is greater than 70, wherein, the following conditional expressions are satisfied: 0.8 < TTL / f < 1.0, 0.5 < CT1 / D12 < 0.9 and 1.5 < f / f1 < 3.0, wherein, TTL is the distance from the object side of the first lens to the imaging surface, f is the focal length of the optical imaging system, CT1 is the thickness at the center of the first lens along the optical axis, D12 is the distance from the image side of the first lens to the object side of the second lens, and f1 is the focal length of the first lens, and wherein, the optical imaging system has a total of four lenses.

15. The optical imaging system according to claim 14, wherein, the following conditional expression is satisfied: 48 < NminV - NmaxV < 76, wherein, NminV is the Abbe number of the lens having the minimum refractive index among the first lens to the fourth lens, and NmaxV is the Abbe number of the lens having the maximum refractive index among the first lens to the fourth lens.

16. The optical imaging system according to claim 14, wherein, the following conditional expression is satisfied: 8.0mm < BFL < 18.0mm, wherein, BFL is the distance from the image side of the fourth lens to the imaging surface.

17. An optical imaging system, comprising: a first lens having positive refractive power and a convex object side; a second lens having negative refractive power and a concave object side and a concave image side; A third lens, having a positive refractive power and a convex object side and a convex image side; and a fourth lens, having a refractive power, wherein the first lens, the second lens, the third lens, and the fourth lens are arranged in order from the object side, wherein the first lens has an Abbe number greater than 70 and a D-shaped cutting shape, wherein the effective radius of the D-shaped cutting shape in a first direction intersecting the optical axis is different from the effective radius in a second direction intersecting the optical axis, wherein the optical imaging system satisfies the conditional expressions: 1.5 < f / f1 < 3.0, 0.8 < TTL / f < 1.0, and 0.5 < CT1 / D12 < 0.9, where f is the focal length of the optical imaging system, f1 is the focal length of the first lens, TTL is the distance from the object side of the first lens to the imaging surface, CT1 is the thickness at the center of the first lens along the optical axis, and D12 is the distance from the image side of the first lens to the object side of the second lens, and wherein the optical imaging system has a total of four lenses.

18. The optical imaging system according to claim 17, wherein, the Abbe number of the first lens is greater than 70 and less than 96.

19. The optical imaging system according to claim 17, wherein, the focal length of the first lens is greater than 8.0 mm and less than 16.0 mm.

Images