Optical image capturing system

Abstract

The invention relates to an optical imaging system. The optical image capturing system includes: a first lens group including a reflective member and one or two lenses disposed in front of the reflective member; and a second lens group disposed behind the reflective member and including a plurality of lenses. One or two lenses included in the first lens group generally have positive refractive power, an image-side surface of a lens disposed closest to the reflective member among the one or two lenses included in the first lens group is concave, the reflective member includes an incident surface, a reflective surface, and an exit surface, and 0.25 < = D12P / DR < = 1.0 is satisfied, d12P is a distance on the optical axis from an image-side surface of a lens disposed closest to the reflective member among the one or two lenses of the first lens group to an incident surface of the reflective member, and DR is a distance on the optical axis from the incident surface of the reflective member to a reflective surface of the reflective member.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority from Korean Patent Application No. 10-2023-0144144 filed on October 25, 2023, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety for all purposes by reference. Technical Field

[0003] The present disclosure relates to optical imaging systems. Background Art

[0004] Recent portable terminals have been equipped with cameras including an optical imaging system including a plurality of lenses to enable video calling and image capturing.

[0005] Furthermore, as the functions of cameras in portable terminals gradually increase, the demand for cameras with high resolution for portable terminals is also increasing.

[0006] In addition, as the size of portable terminals is gradually reduced, cameras for portable terminals are also required to be slimmer. Therefore, it is desirable to develop an optical imaging system that is slim and can achieve high resolution. Summary of the invention

[0007] This Summary is provided to introduce a selection of concepts in a simplified form that are further described in the Detailed Description below. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

[0008] In a general aspect, an optical imaging system includes: a first lens group including a reflective member and one or two lenses disposed in front of the reflective member; and a second lens group disposed behind the reflective member and including a plurality of lenses, wherein one or two lenses included in the first lens group generally have positive refractive power, an image side surface of a lens disposed closest to the reflective member among the one or two lenses of the first lens group is concave, the reflective member includes an incident surface, a reflective surface, and an exit surface, and 0.25≤D12P / DR≤1.0 is satisfied, wherein D12P is a distance on the optical axis of the optical imaging system from the image side surface of the lens disposed closest to the reflective member among the one or two lenses of the first lens group to the incident surface of the reflective member, and DR is a distance on the optical axis from the incident surface of the reflective member to the reflective surface of the reflective member.

[0009] The reflective member may be configured to be rotatable around two axes that are perpendicular to each other.

[0010] One or two lenses included in the first lens group may include a first lens having an object side convex in its paraxial region and an image side concave in its paraxial region, and the effective diameter of the object side of the first lens and the effective diameter of the image side of the first lens may be greater than the minor axis length of the incident surface of the reflecting member.

[0011] It can satisfy 0.6 < RG1_S1 / RG1_S2 < 0.8, where RG1_S1 is the radius of curvature of the object side of the first lens, and RG1_S2 is the radius of curvature of the image side of the first lens.

[0012] It can satisfy 1.3 < fG1 / fG2 < 3, where fG1 is the focal length of the first lens group, and fG2 is the focal length of the second lens group.

[0013] It can satisfy 0.35 ≤ DR / L2S1_ED ≤ 0.65, where L2S1_ED is the effective diameter of the object side of the lens closest to the reflecting member among the plurality of lenses included in the second lens group.

[0014] It can satisfy 0.65 ≤ D11P / DR ≤ 1.55, where D11P is the distance on the optical axis from the object side of the lens closest to the object side of the optical imaging system among one or two lenses included in the first lens group to the incident surface of the reflecting member.

[0015] It can satisfy -0.25 ≤ (RG1_S1 - RG1_S2) / (RG1_S1 + RG1_S2) < 0, where RG1_S1 is the radius of curvature of the object side of the lens closest to the object side of the optical imaging system among one or two lenses included in the first lens group, and RG1_S2 is the radius of curvature of the image side of the lens closest to the reflecting member among one or two lenses included in the first lens group.

[0016] It can satisfy -0.6 ≤ RG2_S1 / fG2 ≤ 2.1, where RG2_S1 is the radius of curvature of the object side of the lens closest to the reflecting member among the plurality of lenses included in the second lens group, and fG2 is the focal length of the second lens group.

[0017] It can satisfy 0.7 ≤ DP21 / DR ≤ 1.6, where DP21 is the distance on the optical axis from the exit surface of the reflecting member to the object side of the lens closest to the reflecting member among the plurality of lenses included in the second lens group.

[0018] It is possible to satisfy 0 < D12P / L < 0.1, 0 < DP21 / L ≤ 0.2, and 0.3 < D12P / DP21 < 0.6, where L is the sum of the distance on the optical axis from the object surface of the lens closest to the object side among one or two lenses included in the first lens group to the reflection surface of the reflection member and the distance on the optical axis from the reflection surface of the reflection member to the imaging surface of the optical imaging system.

[0019] It is possible to satisfy 1.1 ≤ fG1 / L ≤ 1.9, where fG1 is the focal length of the first lens group, and L is the sum of the distance on the optical axis from the object surface of the lens closest to the object side among one or two lenses included in the first lens group to the reflection surface of the reflection member and the distance on the optical axis from the reflection surface of the reflection member to the imaging surface of the optical imaging system.

[0020] It is possible to satisfy 0.1 ≤ Lf / Lr ≤ 0.4, where Lf is the distance on the optical axis from the object surface of the lens closest to the object side among one or two lenses included in the first lens group to the reflection surface of the reflection member, and Lr is the distance on the optical axis from the reflection surface of the reflection member to the imaging surface of the optical imaging system.

[0021] It is possible to satisfy 0.25 < G1_MED / Lr < 0.42 and 0.7 < G2_MED / Lf < 1.4, where G1_MED is the maximum effective diameter of one or two lenses included in the first lens group, and G2_MED is the maximum effective diameter of the multiple lenses included in the second lens group.

[0022] It is possible to satisfy 0.35 < f / fG1 ≤ 0.5, where f is the total focal length of the optical imaging system, and fG1 is the focal length of the first lens group.

[0023] It is possible to satisfy 0.6 < f / fG2 ≤ 1.1, where f is the total focal length of the optical imaging system, and fG2 is the focal length of the second lens group.

[0024] The lens closest to the reflection member among the multiple lenses of the second lens group may have a positive refractive power.

[0025] At least three lenses among the multiple lenses of the second lens group may have a refractive index greater than 1.6.

[0026] In another general aspect, an optical imaging system includes: a first lens group, including a reflective member and one or two lenses arranged in front of the reflective member; and a second lens group, arranged behind the reflective member and including multiple lenses, wherein one or two lenses of the first lens group generally have positive refractive power, the image side surface of the lens of the one or two lenses of the first lens group that is closest to the reflective member is concave, the reflective member includes an incident surface, a reflection surface and an exit surface, and satisfies 0.7≤DP21 / DR≤1.6, wherein DP21 is the distance from the exit surface of the reflective member to the object side surface of the lens of the multiple lenses of the second lens group that is closest to the reflective member on the optical axis of the optical imaging system, and DR is the distance from the incident surface of the reflective member to the reflection surface of the reflective member on the optical axis.

[0027] There may be a total of one lens having refractive power in the first lens group, and a total of four, five, or six lenses having refractive power in the second lens group.

[0028] One lens of the first lens group may be a first lens having positive refractive power, having a convex object-side surface in a paraxial region thereof and having a concave image-side surface in a paraxial region thereof, and the four, five or six lenses of the second lens group may include a second lens, which is closest to the reflecting member and has positive refractive power, among the four, five or six lenses of the second lens group.

[0029] There may be a total of five lenses having refractive power in the second lens group, and the five lenses may include a second lens having positive refractive power, a third lens having negative refractive power, a fourth lens having positive or negative refractive power, a fifth lens having positive refractive power, and a sixth lens having positive or negative refractive power.

[0030] The plurality of lenses of the second lens group may be configured such that lenses disposed adjacent to each other among the plurality of lenses have different refractive indices and different Abbe numbers.

[0031] In another general aspect, an optical imaging system includes: a first lens group including a reflecting member and one or two lenses disposed in front of the reflecting member; and a second lens group disposed behind the reflecting member and including a plurality of lenses, wherein one or two lenses of the first lens group generally have a positive refractive power, an image side surface of the lens disposed closest to the reflecting member among the one or two lenses of the first lens group is concave, the reflecting member includes an incident surface, a reflecting surface, and an exit surface, and 0.3 < D12P / DP21 < 0.6 is satisfied, where D12P is a distance on the optical axis of the optical imaging system from the image side surface of the lens disposed closest to the reflecting member among the one or two lenses of the first lens group to the incident surface of the reflecting member, and DP21 is a distance on the optical axis from the exit surface of the reflecting member to the object side surface of the lens disposed closest to the reflecting member among the plurality of lenses of the second lens group.

[0032] There may be a total of one lens having a refractive power in the first lens group, and a total of four, five, or six lenses having a refractive power in the second lens group.

[0033] One lens of the first lens group may be a first lens having a positive refractive power, having a convex object side surface in its paraxial region and a concave image side surface in its paraxial region, and four, five, or six lenses of the second lens group may include a second lens closest to the reflecting member and having a positive refractive power among the four, five, or six lenses of the second lens group.

[0034] There may be a total of six lenses having a refractive power in the second lens group, and the six lenses may include a second lens having a positive refractive power, a third lens having a positive refractive power, a fourth lens having a negative refractive power, a fifth lens having a negative refractive power, a sixth lens having a positive refractive power, and a seventh lens having a positive or negative refractive power.

[0035] The first lens group may be disposed at a fixed position on the optical axis, and the second lens group may be configured to be movable relative to the first lens group along the optical axis to adjust the focus of the optical imaging system.

[0036] Other features and aspects will be apparent from the following detailed description, the drawings, and the claims. Description of the Drawings

[0037] Figure 1A is a configuration diagram of the optical imaging system according to the first embodiment when photographing an object at an infinite distance.

[0038] Figure 1B is a configuration diagram of the optical imaging system according to the first embodiment when photographing an object at a near focus position (i.e., the nearest position of the object at which the optical imaging system can focus an image of the object).

[0039] Figure 2A is a configuration diagram of the optical imaging system according to the second embodiment when photographing an object at an infinite distance.

[0040] Figure 2B is a configuration diagram of the optical imaging system according to the second embodiment when photographing an object at a near focus position (ie, the closest position of the object at which the optical imaging system can focus an image of the object).

[0041] Figure 3A is a configuration diagram of the optical imaging system according to the third embodiment when photographing an object at an infinite distance.

[0042] Figure 3B is a configuration diagram of the optical imaging system according to the third embodiment when photographing an object at a near focus position (ie, the closest position of the object at which the optical imaging system can focus an image of the object).

[0043] Figure 4A is a configuration diagram of the optical imaging system according to the fourth embodiment when photographing an object at an infinite distance.

[0044] Figure 4B is a configuration diagram of the optical imaging system according to the fourth embodiment when photographing an object at a near focus position (ie, the closest position of the object at which the optical imaging system can focus an image of the object).

[0045] Figure 5A is a configuration diagram of the optical imaging system according to the fifth embodiment when photographing an object at an infinite distance.

[0046] Figure 5B is a configuration diagram of the optical imaging system according to the fifth embodiment when photographing an object at a near focus position (ie, the closest position of the object at which the optical imaging system can focus an image of the object).

[0047] Fig. 6A is a configuration diagram of the optical imaging system according to the sixth embodiment when photographing an object at an infinite distance.

[0048] Figure 6B is a configuration diagram of the optical imaging system according to the sixth embodiment when photographing an object at a near focus position (ie, the closest position of the object at which the optical imaging system can focus an image of the object).

[0049] Fig. 7A is a configuration diagram of the optical imaging system according to the seventh embodiment when photographing an object at an infinite distance.

[0050] Figure 7Bis a configuration diagram of the optical imaging system according to the seventh embodiment when photographing an object at a near focus position (ie, the closest position of the object at which the optical imaging system can focus an image of the object).

[0051] Throughout the drawings and detailed description, the same reference numerals refer to the same elements. For clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative sizes, proportions, and depictions of elements in the drawings may be exaggerated. DETAILED DESCRIPTION

[0052] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is only an example and is not limited to the order set forth herein, but can be changed as will be apparent after understanding the disclosure of the present application, except for operations that must occur in a certain order. In addition, in order to improve clarity and brevity, the description of features known in the art may be omitted.

[0053] The features described herein may be implemented in different forms and are not to be construed as being limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways to implement the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0054] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, or “coupled to” another element, it may be directly “on”, directly “connected to”, or directly “coupled to” the other element, or one or more other elements may be present between them. Conversely, when an element is described as being “directly” “on”, “directly connected to”, or “directly coupled to” another element, there are no other elements present between them.

[0055] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more of the associated listed items.

[0056] Although terms such as "first", "second", and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Instead, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, the first member, first component, first region, first layer, or first portion mentioned in the examples described herein may also be referred to as the second member, second component, second region, second layer, or second portion without departing from the teachings of the examples.

[0057] For ease of description, spatially relative terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the drawings. In addition to the orientation depicted in the drawings, such spatially relative terms are intended to also include different orientations of the device in use or operation. For example, if the device in the drawings is turned over, an element described as being "above" or "upper" relative to another element will then be "below" or "lower" relative to the other element. Therefore, the term "above" includes both the orientation of the above and below, depending on the spatial orientation of the device. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein will be interpreted accordingly.

[0058] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. The words "a", "an" and "the" are intended to include plural forms as well, unless the context clearly indicates otherwise. The terms "include", "comprises" and "have" specify the presence of stated features, quantities, operations, components, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements and / or combinations thereof.

[0059] exist Figures 1A to 7B In the configuration diagrams, the thickness, size, and shape of the lens may be slightly exaggerated for the purpose of explanation. In addition, the spherical or aspherical shapes shown in the configuration diagrams are only examples and are not limited to these shapes.

[0060] The optical imaging system according to the embodiment may be installed in a portable electronic device. For example, the optical imaging system may be a component of a camera module installed in the portable electronic device. The portable electronic device may be a portable electronic device such as a mobile communication terminal, a smart phone, and a tablet PC, but is not limited thereto.

[0061] In this specification, the first lens (or the front lens) refers to the lens closest to the object side of the optical imaging system, and the last lens (or the last lens) refers to the lens closest to the imaging surface (or image sensor) of the optical imaging system.

[0062] In this specification, the values ​​of the radius of curvature, thickness, distance, focal length of the lens are all in mm, and the viewing angle is in degree.

[0063] Furthermore, in the description of the shape of each lens, a statement that the surface of the lens is convex means that the surface is convex in the paraxial region of the surface, and a statement that the surface of the lens is concave means that the surface is concave in the paraxial region of the surface.

[0064] Therefore, even if the surface of a lens is described as having a convex shape, an edge portion of the surface may have a concave shape. Similarly, even if the surface of a lens is described as having a concave shape, an edge portion of the surface may have a convex shape.

[0065] The paraxial region of the lens surface is the central portion of the lens surface around the optical axis of the lens surface, where light incident on the lens surface forms a small angle θ with the optical axis, and the approximations of sinθ≈θ, tanθ≈θ, and cosθ≈1 are valid.

[0066] The imaging plane may refer to a virtual plane on which a focus is formed by the optical imaging system. Alternatively, the imaging plane may refer to one surface of the image sensor that receives light passing through the optical imaging system.

[0067] An optical imaging system according to an embodiment includes a plurality of lens groups. As an example, the optical imaging system may include a first lens group and a second lens group.

[0068] The first lens group and the second lens group each include one or more lenses. For example, the first lens group may include one or two lenses, and the second lens group may include four, five or six lenses.

[0069] In an embodiment, the optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, which are sequentially arranged from the object side of the optical imaging system toward the imaging surface of the optical imaging system. In this case, the first lens group includes the first lens, and the second lens group includes the second lens to the fifth lens.

[0070] In an embodiment, the optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, which are sequentially arranged from the object side of the optical imaging system toward the imaging surface of the optical imaging system. In this case, the first lens group includes the first lens, and the second lens group includes the second lens to the sixth lens.

[0071] In an embodiment, the optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, which are sequentially arranged from the object side of the optical imaging system toward the imaging surface of the optical imaging system. In this case, the first lens group includes the first lens, and the second lens group includes the second lens to the seventh lens.

[0072] The optical imaging system according to the embodiment may further include a reflective member having a reflective surface that changes the light path. As an example, the reflective member may be a reflective mirror or a prism.

[0073] For example, when the reflective member is a prism, the reflective member may be in the form of a cube or a rectangular parallelepiped that is diagonally divided into two. The reflective member may include an incident surface, a reflection surface, and an exit surface. The reflective member includes three quadrilateral surfaces and two triangular surfaces. For example, the incident surface, the reflection surface, and the exit surface of the reflective member are each quadrilateral, and the two sides of the reflective member are approximately triangular.

[0074] In an embodiment, the reflective member may be disposed in front of the second lens group. For example, the reflective member may be disposed between the first lens group and the second lens group.

[0075] The first lens group may be disposed in front of the reflective member, and the second lens group may be disposed behind the reflective member. The optical axis of the first lens group and the optical axis of the second lens group may be parallel to each other and may be part of the optical axis of the optical imaging system.

[0076] According to an embodiment, the reflective member may be included in the first lens group. In this case, the reflective member may be disposed behind one or two lenses included in the first lens group.

[0077] For example, when the first lens group includes one lens (for example, a first lens), the reflecting member is disposed between the first lens of the first lens group and the second lens of the second lens group.

[0078] By bending the optical path via the reflective member, a long optical path can be formed in a relatively narrow space.

[0079] Therefore, the optical imaging system can be miniaturized and have a long focal length.

[0080] The optical imaging system according to the embodiment has characteristics of a telephoto lens having a relatively narrow viewing angle and a relatively long focal length.

[0081] Furthermore, the optical imaging system may further include an image sensor for converting an image of the object incident on a surface of the image sensor into an electrical signal.

[0082] In addition, the optical imaging system may further include an infrared blocking filter (hereinafter referred to as a filter) to block infrared rays in the light incident through the optical imaging system. The filter may be disposed between the last lens of the optical imaging system and the image sensor.

[0083] In addition, the optical imaging system may further include an aperture to limit the amount of light. In an embodiment, the aperture may be disposed between the third lens and the fourth lens. In an embodiment, the aperture may be disposed between the fourth lens and the fifth lens. In an embodiment, the aperture may be disposed between the reflective member and the second lens.

[0084] In an embodiment, the first lens group may include a first lens, and the second lens group may include a second lens, a third lens, a fourth lens, and a fifth lens.

[0085] In an embodiment, the first lens group may include a first lens, and the second lens group may include a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens.

[0086] In an embodiment, the first lens group may include a first lens, and the second lens group may include a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens.

[0087] In an embodiment, a plurality of lenses may be disposed to be spaced apart from each other in the optical axis direction.

[0088] In an embodiment, some of the plurality of lenses may be configured as a cemented lens. For example, the third lens and the fourth lens may be a cemented lens. For example, the image side surface of the third lens and the object side surface of the fourth lens may be bonded to each other to form a cemented lens.

[0089] The sixth lens and the seventh lens may be a cemented lens. For example, the image-side surface of the sixth lens and the object-side surface of the seventh lens may be bonded to each other to form a cemented lens.

[0090] Either or both of the first lens group and the second lens group can be moved to adjust the focus of the optical imaging system.

[0091] For example, the distance between the first lens group and the second lens group may be variable. For example, the first lens group may be fixedly disposed, and the second lens group may be configured to be movable in the optical axis direction. When the second lens group moves from the image side toward the object side, the optical imaging system may capture an image of an object at a distance between infinity (at the position of the second lens group closest to the image side) and a close distance (near focus distance) (e.g., 300 mm) (at the position of the second lens group closest to the object side).

[0092] Since the first lens group is located in front of the optical imaging system, waterproofing and dustproofing can be achieved by fixing the position of the first lens group.

[0093] The first lens group has generally positive refractive power and includes at least one lens having a meniscus shape that is convex toward the object.

[0094] In an embodiment, the first lens group includes one lens (eg, a first lens). The first lens is disposed in front of the reflective member.

[0095] The first lens may have positive refractive power and have a meniscus shape convex toward the object. The radius of curvature of the object-side surface of the first lens may be smaller than the radius of curvature of the image-side surface of the first lens.

[0096] An effective diameter of the object-side surface and an effective diameter of the image-side surface of the first lens may each be larger than a short-axis length of the incident surface of the reflective member.

[0097] The first lens may be made of a plastic material, and may have an object-side surface and an image-side surface each being an aspherical surface.

[0098] In an embodiment, the first lens group includes two lenses (e.g., a 1-1 lens and a 1-2 lens). For example, when the first lens group includes two lenses, the composite focal length of the two lenses may have positive refractive power. In addition, the two lenses may be combined together. For example, the image side surface of the 1-1 lens and the object side surface of the 1-2 lens may be combined with each other to form a cemented lens.

[0099] The second lens group includes a plurality of lenses and has positive refractive power as a whole. Among the plurality of lenses in the second lens group, at least three lenses have a refractive index exceeding 1.6. Among the plurality of lenses in the second lens group, the lens disposed closest to the reflective member has positive refractive power.

[0100] In an embodiment, the second lens group includes a second lens, a third lens, a fourth lens, and a fifth lens. The second lens may have positive refractive power, the third lens may have positive refractive power, the fourth lens may have negative refractive power, and the fifth lens may have positive refractive power.

[0101] The second to fifth lenses may be configured such that lenses disposed adjacent to each other have different refractive indices and different Abbe numbers. For example, the Abbe number of the second lens is greater than the Abbe number of the third lens, the Abbe number of the third lens is less than the Abbe number of the fourth lens, and the Abbe number of the fourth lens is less than the Abbe number of the fifth lens.

[0102] In an embodiment, the second lens group includes a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The second lens may have positive refractive power, the third lens may have negative refractive power, the fourth lens may have positive refractive power or negative refractive power, the fifth lens may have positive refractive power, and the sixth lens may have positive refractive power or negative refractive power.

[0103] The second to sixth lenses may be configured such that lenses disposed adjacent to each other have different refractive indices and different Abbe numbers. For example, the Abbe number of the second lens is greater than the Abbe number of the third lens, the Abbe number of the third lens is less than the Abbe number of the fourth lens, the Abbe number of the fourth lens is greater than the Abbe number of the fifth lens, and the Abbe number of the fifth lens is less than the Abbe number of the sixth lens.

[0104] In an embodiment, the second lens group includes a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The second lens may have positive refractive power, the third lens may have positive refractive power, the fourth lens may have negative refractive power, the fifth lens may have negative refractive power, the sixth lens may have positive refractive power, and the seventh lens may have positive refractive power or negative refractive power.

[0105] The second lens to the seventh lens may be configured such that the lenses disposed adjacent to each other have different refractive indices and different Abbe numbers. For example, the Abbe number of the second lens is smaller than the Abbe number of the third lens, the Abbe number of the third lens is larger than the Abbe number of the fourth lens, the Abbe number of the fourth lens is smaller than the Abbe number of the fifth lens, the Abbe number of the fifth lens is smaller than the Abbe number of the sixth lens, and the Abbe number of the sixth lens is larger than the Abbe number of the seventh lens.

[0106] The reflective member is disposed in front of the second lens group and can rotate around two axes perpendicular to each other to compensate for shaking during shooting.

[0107] For example, when shaking occurs when capturing an image or video due to, for example, hand tremor of a user or other disturbances, the shaking may be compensated for by rotating the reflection member about two axes perpendicular to each other in response to the shaking.

[0108] Since the reflection member has a relatively lighter weight than the optical imaging system, the shake can be easily compensated with a smaller driving force.

[0109] Some or all of the multiple lenses may have aspherical surfaces.

[0110] In an embodiment, one or more lenses included in the first lens group may have aspherical object-side and image-side surfaces.

[0111] In an embodiment, one or more of the plurality of lenses included in the second lens group may have an aspherical object side surface and an aspherical image side surface.

[0112] The aspherical surface of the lens is represented by Equation 1 below.

[0113]

[0114] In Equation 1, c is the curvature of the lens surface and is equal to the reciprocal of the radius of curvature of the lens surface at the optical axis of the lens surface, K is the conic constant, and Y is the distance from any point on the aspherical surface of the lens to the optical axis. In addition, the constants A to E are aspherical surface coefficients. Z (also referred to as the sag) is the distance in the direction parallel to the optical axis between the point on the aspherical surface of the lens at a distance Y from the optical axis of the aspherical surface and the tangent plane perpendicular to the optical axis and intersecting the vertex of the aspherical surface.

[0115] The optical imaging system according to the embodiment may satisfy any one of the following conditional expressions 1 to 21 or any combination of any two or more of the following conditional expressions 1 to 21:

[0116] 0.25 ≤ D12P / DR ≤ 1.0 (conditional expression 1)

[0117] 0.35 ≤ DR / L2S1_ED ≤ 0.65 (conditional expression 2)

[0118] 0.65 ≤ D11P / DR ≤ 1.55 (conditional expression 3)

[0119] -0.25 ≤ (RG1_S1 - RG1_S2) / (RG1_S1 + RG1_S2) < 0 (conditional expression 4)

[0120] -0.6 ≤ RG2_S1 / fG2 ≤ 2.1 (conditional expression 5)

[0121] 0.7 ≤ DP21 / DR ≤ 1.6 (conditional expression 6)

[0122] 1.1 ≤ fG1 / L ≤ 1.9 (conditional expression 7)

[0123] 0.1 ≤ Lf / Lr ≤ 0.4 (conditional expression 8)

[0124] 0 < D12P / L < 0.1 (conditional expression 9)

[0125] 0 < DP21 / L ≤ 0.2 (conditional expression 10)

[0126] 1 < G1_MED / PED < 1.3 (conditional expression 11)

[0127] 0.6 < RG1_S1 / RG1_S2 < 0.8 (Conditional Expression 12)

[0128] 0.18 < DL2 / L < 0.45 (Conditional Expression 13)

[0129] 0.35 < f / fG1 ≤ 0.5 (Conditional Expression 14)

[0130] 0.6 < f / fG2 ≤ 1.1 (Conditional Expression 15)

[0131] 1.3 < fG1 / fG2 < 3 (Conditional Expression 16)

[0132] 0.3 < D12P / DP21 < 0.6 (Conditional Expression 17)

[0133] 0.7 < G2_MED / Lf < 1.4 (Conditional Expression 18)

[0134] 0.25 < G1_MED / Lr < 0.42 (Conditional Expression 19)

[0135] 5.3 < Fno × (fG1 / f) < 7.7 (Conditional Expression 20)

[0136] 0.35 (° / mm) < FOV / Lr < 0.7 (° / mm) (Conditional Expression 21)

[0137] In an embodiment, the optical imaging system may satisfy 0.25 ≤ D12P / DR ≤ 1.0 (Conditional Expression 1). In this case, D12P is the distance on the optical axis between the first lens group and the incident surface of the reflection member. Specifically, D12P is the distance on the optical axis from the image side surface (e.g., the image side surface of the first lens) of the lens closest to the reflection member among one or two lenses included in the first lens group to the incident surface of the reflection member. DR is the distance on the optical axis from the incident surface of the reflection member to the reflection surface of the reflection member.

[0138] In this embodiment, one or two lenses included in the first lens group are arranged closer to the object side than the reflection member. Therefore, interference between the first lens group and the reflection member can be prevented, and the optical imaging system can be miniaturized.

[0139] In an embodiment, the optical imaging system may satisfy 0.35 ≤ DR / L2S1_ED ≤ 0.65 (Conditional Expression 2). In this case, L2S1_ED is the effective diameter of the object side surface (e.g., the object side surface of the second lens) of the lens closest to the reflection member among the lenses included in the second lens group. Therefore, the optical imaging system can be miniaturized.

[0140] In an embodiment, the optical imaging system may satisfy 0.65≤D11P / DR≤1.55 (conditional expression 3). In this case, D11P is the distance on the optical axis from the object side of the lens disposed closest to the object side in one or two lenses included in the first lens group (e.g., the object side of the first lens) to the incident surface of the reflective member. Therefore, the optical imaging system can be prevented from becoming too thick in the optical axis direction of the first lens group. In addition, when the reflective member is rotated for shake correction, the first lens group and the reflective member can be prevented from interfering with each other.

[0141] In an embodiment, the optical imaging system may satisfy -0.25≤(RG1_S1-RG1_S2) / (RG1_S1+RG1_S2)<0 (conditional expression 4). In this case, RG1_S1 is the radius of curvature of the object side surface of the lens disposed closest to the object side among one or two lenses included in the first lens group (e.g., the object side surface of the first lens), and RG1_S2 is the radius of curvature of the image side surface of the lens disposed closest to the reflection member among one or two lenses included in the first lens group (e.g., the image side surface of the first lens). Therefore, spherical aberration occurring in the first lens group may be significantly reduced. In addition, by appropriately adjusting the focal length of one or two lenses included in the first lens group, the occurrence of aberrations may be significantly reduced while maintaining sufficient telephoto performance.

[0142] In an embodiment, the optical imaging system may satisfy -0.6≤RG2_S1 / fG2≤2.1 (conditional expression 5). In this case, RG2_S1 is the radius of curvature of the object side surface of the lens disposed closest to the reflection member among the lenses included in the second lens group (e.g., the object side surface of the second lens), and fG2 is the focal length of the second lens group. Therefore, by optimizing the refractive power of the second lens group, spherical aberration can be reduced and resolution can be improved.

[0143] In an embodiment, the optical imaging system may satisfy 0.7≤DP21 / DR≤1.6 (conditional expression 6). In this case, DP21 is the distance on the optical axis from the exit surface of the reflection member to the object side surface of the lens closest to the reflection member among the lenses included in the second lens group (e.g., the object side surface of the second lens). When the second lens group moves for focus adjustment, it is necessary to ensure that there is an appropriate space between the reflection member and the second lens group. Therefore, by appropriately adjusting the size of the reflection member and the distance between the reflection member and the second lens group on the optical axis, the optical imaging system can be miniaturized and the space required for shake correction and focus adjustment can be ensured.

[0144] In an embodiment, the optical imaging system may satisfy 1.1 ≤ fG1 / L ≤ 1.9 (conditional expression 7). In this case, fG1 is the focal length of the first lens group, and L is the sum of the distance on the optical axis from the object side surface (e.g., the object side surface of the first lens) of the lens disposed closest to the object side among one or two lenses included in the first lens group to the reflection surface of the reflection member and the distance on the optical axis from the reflection surface of the reflection member to the imaging surface. Therefore, the optical imaging system can be miniaturized, and the occurrence of aberration can be significantly reduced.

[0145] In an embodiment, the optical imaging system may satisfy 0.1 ≤ Lf / Lr ≤ 0.4 (conditional expression 8). In this case, Lf is the distance on the optical axis from the object side surface (e.g., the object side surface of the first lens) of the lens disposed closest to the object side among one or two lenses included in the first lens group to the reflection surface of the reflection member, and Lr is the distance on the optical axis from the reflection surface of the reflection member to the imaging surface. Therefore, the optical imaging system can be miniaturized.

[0146] In an embodiment, the optical imaging system may satisfy 0 < D12P / L < 0.1 (conditional expression 9). Therefore, by appropriately adjusting the distance on the optical axis between one or two lenses included in the first lens group and the reflection member, the optical imaging system can be miniaturized.

[0147] In an embodiment, the optical imaging system may satisfy 0 < DP21 / L ≤ 0.2 (conditional expression 10). Therefore, by appropriately adjusting the distance on the optical axis between the reflection member and the second lens group, the optical imaging system can be miniaturized.

[0148] In an embodiment, the optical imaging system may satisfy 1 < G1_MED / PED < 1.3 (conditional expression 11). In this case, G1_MED is the maximum effective diameter of one or two lenses included in the first lens group. For example, G1_MED may be the effective diameter of the object side surface of the first lens. PED is the short axis length of the incident surface of the reflection member. Therefore, the image brightness can be increased by adjusting the effective diameter of the first lens.

[0149] In an embodiment, the optical imaging system may satisfy 0.6 < RG1_S1 / RG1_S2 < 0.8 (conditional expression 12). Therefore, sufficient space in which the reflection member can rotate when compensating for shake can be ensured.

[0150] In an embodiment, the optical imaging system may satisfy 0.18 < DL2 / L < 0.45 (conditional expression 13). In this case, DL2 is the distance from the object side surface of the lens closest to the reflection member in the second lens group (e.g., the second lens) on the optical axis to the image side surface of the last lens in the second lens group (e.g., the fifth lens, the sixth lens, or the seventh lens). Therefore, the aberration can be significantly reduced, and the optical imaging system can be miniaturized.

[0151] In an embodiment, the optical imaging system may satisfy 0.35 < f / fG1 ≤ 0.5 (conditional expression 14). In this case, f is the total focal length of the optical imaging system. Therefore, the angle of the light incident on the reflection member can be reduced by adjusting the focal length of the first lens group disposed in front of the reflection member, and thus the resolution deterioration due to the rotation of the reflection member can be significantly reduced.

[0152] In an embodiment, the optical imaging system may satisfy 0.6 < f / fG2 ≤ 1.1 (conditional expression 15). Therefore, by appropriately distributing the refractive power of each lens group, the optical imaging system can be miniaturized and the resolution can be improved.

[0153] In an embodiment, the optical imaging system may satisfy 1.3 < fG1 / fG2 < 3 (conditional expression 16). Therefore, by appropriately distributing the refractive power of each lens group, the optical imaging system can be miniaturized and the resolution can be improved.

[0154] In an embodiment, the optical imaging system may satisfy 0.3 < D12P / DP21 < 0.6 (conditional expression 17). Therefore, the optical imaging system can be miniaturized, and sufficient space for rotating the reflection member during shake correction can be ensured.

[0155] In an embodiment, the optical imaging system may satisfy 0.7 < G2_MED / Lf < 1.4 (conditional expression 18). In this case, G2_MED is the effective diameter of the lens having the largest effective diameter among the lenses included in the second lens group. Therefore, the optical imaging system can be miniaturized while ensuring the brightness of the optical imaging system.

[0156] In an embodiment, the optical imaging system may satisfy 0.25 < G1_MED / Lr < 0.42 (conditional expression 19). Therefore, the optical imaging system can be miniaturized while ensuring the brightness of the optical imaging system.

[0157] In an embodiment, the optical imaging system may satisfy 5.3 < Fno × (fG1 / f) < 7.7 (conditional expression 20). In this case, Fno is the f-number of the optical imaging system. Accordingly, the image brightness and resolution can be improved.

[0158] In an embodiment, the optical imaging system may satisfy 0.35 (° / mm) < FOV / Lr < 0.7 (° / mm) (conditional expression 21). In this case, FOV is the half field of view of the optical imaging system. Accordingly, the telephoto performance can be improved while miniaturizing the optical imaging system.

[0159] Figure 1A is a configuration diagram of the optical imaging system according to the first embodiment when photographing an object at an infinite distance, and Figure 1B is a configuration diagram of the optical imaging system according to the first embodiment when photographing an object at a near focus position (i.e., the nearest position of the object at which the optical imaging system can focus an image of the object).

[0160] will be described with reference to Figure 1A and Figure 1B the optical imaging system according to the first embodiment.

[0161] The optical imaging system according to the first embodiment includes a first lens group G1 and a second lens group G2. In addition, the optical imaging system includes a reflection member P disposed in front of the second lens group G2.

[0162] In order from the object side, the first lens group G1 includes a first lens 110, and the second lens group G2 includes a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, and a sixth lens 160.

[0163] The first lens group G1 may further include a reflection member P disposed between the first lens 110 and the second lens 120. An aperture may be disposed between the third lens 130 and the fourth lens 140.

[0164] The first lens 110 to the sixth lens 160 are made of a plastic material.

[0165] In addition, the optical imaging system may further include a filter 180 and an image sensor.

[0166] The optical imaging system according to the first embodiment may form a focus on the imaging surface 190. The imaging surface 190 may refer to a surface on which the optical imaging system forms a focus. As an example, the imaging surface 190 may refer to a surface of the image sensor that receives light.

[0167] In the first embodiment, the reflection member P may be a prism, but alternatively may be a mirror.

[0168] The first lens group G1 is fixedly disposed, and the second lens group G2 may be moved along the optical axis for focus adjustment.

[0169] The characteristics of each lens (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number, focal length, and effective radius) are shown in Table 1 below.

[0170] Table 1

[0171]

[0172] Table 2

[0173]

[0174] In the above Table 2, D0 is the object distance, that is, the distance from the object to the object side surface of the first lens 110 on the optical axis, D1 is the distance between the reflective member P and the second lens 120 on the optical axis, D2 is the distance between the sixth lens 160 and the filter 180 on the optical axis, and D3 is the distance between the filter 180 and the imaging surface 190 on the optical axis.

[0175] In addition, f is the total focal length of the optical imaging system, MAG is the magnification of the optical imaging system, FOV is the half angle of view of the optical imaging system, Fno is the f-number of the optical imaging system, and L is the distance from the object side surface of the first lens 110 to the imaging surface 190 on the optical axis. The magnification may refer to the ratio of the size of an image to the size of an object.

[0176] For reference, in Table 1, the effective radius of a prism may refer to the length of a surface (eg, an incident surface, a reflection surface, and an exit surface) of the prism in a short axis direction.

[0177] In the first embodiment, the first lens group G1 has positive refractive power as a whole, and the second lens group G2 has positive refractive power as a whole.

[0178] The focal length fG1 of the first lens group G1 is 38.0026 mm, and the focal length fG2 of the second lens group G2 is 27.169 mm.

[0179] The effective radius of the object side surface of the first lens 110 of the first lens group G1 is greater than the effective radius of the image side surface thereof. The effective radius of the object side surface of the first lens 110 is 3.480 mm.

[0180] In the second lens group G2, the effective radius of the object-side surface of the second lens 120 is the largest, and the effective radius of the object-side surface of the second lens 120 is 2.060 mm.

[0181] The first lens 110 has positive refractive power, an object-side surface of the first lens 110 is convex in a paraxial region thereof, and an image-side surface of the first lens 110 is concave in a paraxial region thereof.

[0182] The second lens 120 has positive refractive power, and the object-side surface and the image-side surface of the second lens 120 are convex in a paraxial region thereof.

[0183] The third lens 130 has negative refractive power, and the object-side surface and the image-side surface of the third lens 130 are concave in a paraxial region thereof.

[0184] The fourth lens 140 has negative refractive power, and the object-side surface and the image-side surface of the fourth lens 140 are concave in a paraxial region thereof.

[0185] The fifth lens 150 has positive refractive power, an object-side surface of the fifth lens 150 is concave in a paraxial region thereof, and an image-side surface of the fifth lens 150 is convex in a paraxial region thereof.

[0186] The sixth lens 160 has positive refractive power, and the object-side surface and the image-side surface of the sixth lens 160 are convex in a paraxial region thereof.

[0187] Each surface of the first to sixth lenses 110 to 160 has an aspherical coefficient as shown in the following Table 3. For example, the object-side surface and the image-side surface of each of the first to sixth lenses 110 to 160 are aspherical.

[0188] Table 3

[0189]

[0190]

[0191] Figure 2A is a configuration diagram of the optical imaging system according to the second embodiment when photographing an object at an infinite distance, and Figure 2B is a configuration diagram of the optical imaging system according to the second embodiment when photographing an object at a near focus position (ie, the closest position of the object at which the optical imaging system can focus an image of the object).

[0192] Will refer to Figure 2A and Figure 2B An optical imaging system according to a second embodiment is described.

[0193] The optical imaging system according to the second embodiment includes a first lens group G1 and a second lens group G2. In addition, the optical imaging system includes a reflecting member P disposed in front of the second lens group G2.

[0194] In order from the object side, the first lens group G1 includes a first lens 210 , and the second lens group G2 includes a second lens 220 , a third lens 230 , a fourth lens 240 , a fifth lens 250 , a sixth lens 260 , and a seventh lens 270 .

[0195] The first lens group G1 may further include a reflective member P disposed between the first lens 210 and the second lens 220. An aperture may be disposed between the fourth lens 240 and the fifth lens 250.

[0196] The first lens 210 is made of a plastic material, and the second to seventh lenses 220 to 270 are made of a glass material.

[0197] In addition, the optical imaging system may further include a filter 280 and an image sensor.

[0198] The optical imaging system according to the second embodiment may form a focus on an imaging surface 290. The imaging surface 290 may refer to a surface on which a focus is formed by the optical imaging system. As an example, the imaging surface 290 may refer to one surface of an image sensor that receives light.

[0199] In the second embodiment, the reflective member P may be a prism, but may alternatively be a reflective mirror.

[0200] The first lens group G1 is fixedly disposed, and the second lens group G2 may be moved along the optical axis for focus adjustment.

[0201] The characteristics of each lens (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number, focal length, and effective radius) are shown in Table 4 below.

[0202] Table 4

[0203]

[0204] Table 5

[0205]

[0206] In the above Table 5, D0 is the object distance, that is, the distance from the object to the object side surface of the first lens 210 on the optical axis, D1 is the distance between the reflecting member P and the second lens 220 on the optical axis, D2 is the distance between the seventh lens 270 and the filter 280 on the optical axis, and D3 is the distance between the filter 280 and the imaging surface 290 on the optical axis.

[0207] In addition, f is the total focal length of the optical imaging system, MAG is the magnification of the optical imaging system, FOV is the half angle of view of the optical imaging system, Fno is the f-number of the optical imaging system, and L is the distance from the object side of the first lens 210 to the imaging surface 290 on the optical axis. The magnification may refer to the ratio of the size of an image to the size of an object.

[0208] In the second embodiment, the first lens group G1 has positive refractive power as a whole, and the second lens group G2 has positive refractive power as a whole.

[0209] The focal length fG1 of the first lens group G1 is 38.0026 mm, and the focal length fG2 of the second lens group G2 is 17.181 mm.

[0210] The effective radius of the object side surface of the first lens 210 of the first lens group G1 is greater than the effective radius of the image side surface thereof. The effective radius of the object side surface of the first lens 210 is 4.000 mm.

[0211] In the second lens group G2, the effective radius of the image side surface of the seventh lens 270 is the largest, and the effective radius of the image side surface of the seventh lens 270 is 3.365 mm.

[0212] The first lens 210 has positive refractive power, an object-side surface of the first lens 210 is convex in a paraxial region thereof, and an image-side surface of the first lens 210 is concave in a paraxial region thereof.

[0213] The second lens 220 has positive refractive power, and the object-side surface and the image-side surface of the second lens 220 are convex in a paraxial region thereof.

[0214] The third lens 230 has positive refractive power, an object-side surface of the third lens 230 is convex in a paraxial region thereof, and an image-side surface of the third lens 230 is concave in a paraxial region thereof.

[0215] The fourth lens 240 has negative refractive power, an object-side surface of the fourth lens 240 is convex in a paraxial region thereof, and an image-side surface of the fourth lens 240 is concave in a paraxial region thereof.

[0216] The fifth lens 250 has negative refractive power, an object-side surface of the fifth lens 250 is concave in a paraxial region thereof, and an image-side surface of the fifth lens 250 is convex in a paraxial region thereof.

[0217] The sixth lens 260 has positive refractive power, an object-side surface of the sixth lens 260 is concave in a paraxial region thereof, and an image-side surface of the sixth lens 260 is convex in a paraxial region thereof.

[0218] The seventh lens 270 has negative refractive power, the object-side surface of the seventh lens 270 is concave in a paraxial region thereof, and the image-side surface of the seventh lens 270 is convex in a paraxial region thereof.

[0219] In addition, the third lens 230 and the fourth lens 240 may be combined with each other to form a cemented lens. The sixth lens 260 and the seventh lens 270 may be combined with each other to form a cemented lens.

[0220] Each surface of the first lens 210 has an aspherical coefficient shown in Table 6. For example, the object-side surface and the image-side surface of the first lens 210 are aspherical.

[0221] Table 6

[0222] S1 S2 Cone constant (K) 1.221522 3.160944 Fourth coefficient (A) 2.61543E-05 3.21779E-04 Sixth coefficient (B) 1.46259E-05 2.25792E-05 Eighth coefficient (C) -5.06176E-07 -4.51403E-07 Tenth coefficient (D) 1.03401E-08 3.31379E-08 Twelfth coefficient (E) 2.07931E-09 3.78068E-09

[0223] Figure 3A is a configuration diagram of an optical imaging system according to a third embodiment when photographing an object at an infinite distance, and Figure 3B is a configuration diagram of the optical imaging system according to the third embodiment when photographing an object at a near focus position (ie, the closest position of the object at which the optical imaging system can focus an image of the object).

[0224] Will refer to Figure 3A and Figure 3B An optical imaging system according to a third embodiment is described.

[0225] The optical imaging system according to the third embodiment includes a first lens group G1 and a second lens group G2. In addition, the optical imaging system includes a reflecting member P disposed in front of the second lens group G2.

[0226] In order from the object side, the first lens group G1 includes a first lens 310 , and the second lens group G2 includes a second lens 320 , a third lens 330 , a fourth lens 340 , a fifth lens 350 , a sixth lens 360 , and a seventh lens 370 .

[0227] The first lens group G1 may further include a reflective member P disposed between the first lens 310 and the second lens 320. An aperture may be disposed between the fourth lens 340 and the fifth lens 350.

[0228] The first lens 310 is made of a plastic material, and the second to seventh lenses 320 to 370 are made of a glass material.

[0229] In addition, the optical imaging system may further include a filter 380 and an image sensor.

[0230] The optical imaging system according to the third embodiment may form a focus on an imaging surface 390. The imaging surface 390 may refer to a surface on which a focus is formed by the optical imaging system. As an example, the imaging surface 390 may refer to one surface of an image sensor that receives light.

[0231] In the third embodiment, the reflective member P may be a prism, but may alternatively be a reflective mirror.

[0232] The first lens group G1 is fixedly disposed, and the second lens group G2 may be moved along the optical axis for focus adjustment.

[0233] The characteristics of each lens (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number, focal length, and effective radius) are shown in Table 7 below.

[0234] Table 7

[0235]

[0236] Table 8

[0237]

[0238]

[0239] In the above Table 8, D0 is the object distance, that is, the distance from the object to the object side surface of the first lens 310 on the optical axis, D1 is the distance between the reflecting member P and the second lens 320 on the optical axis, D2 is the distance between the seventh lens 370 and the filter 380 on the optical axis, and D3 is the distance between the filter 380 and the imaging surface 390 on the optical axis.

[0240] In addition, f is the total focal length of the optical imaging system, MAG is the magnification of the optical imaging system, FOV is the half angle of view of the optical imaging system, Fno is the f-number of the optical imaging system, and L is the distance from the object side surface of the first lens 310 to the imaging surface 390 on the optical axis. The magnification may refer to the ratio of the size of an image to the size of an object.

[0241] In the third embodiment, the first lens group G1 has positive refractive power as a whole, and the second lens group G2 has positive refractive power as a whole.

[0242] The focal length fG1 of the first lens group G1 is 44.8451 mm, and the focal length fG2 of the second lens group G2 is 15.162 mm.

[0243] The effective radius of the object side surface of the first lens 310 of the first lens group G1 is greater than the effective radius of the image side surface thereof. The effective radius of the object side surface of the first lens 310 is 4.500 mm.

[0244] In the second lens group G2, the effective radius of the image side surface of the seventh lens 370 is the largest, and the effective radius of the image side surface of the seventh lens 370 is 3.600 mm.

[0245] The first lens 310 has positive refractive power, an object-side surface of the first lens 310 is convex in a paraxial region thereof, and an image-side surface of the first lens 310 is concave in a paraxial region thereof.

[0246] The second lens 320 has positive refractive power, the object-side surface of the second lens 320 is convex in the paraxial region thereof, and the image-side surface of the second lens 320 is concave in the paraxial region thereof.

[0247] The third lens 330 has positive refractive power, an object-side surface of the third lens 330 is convex in a paraxial region thereof, and an image-side surface of the third lens 330 is concave in a paraxial region thereof.

[0248] The fourth lens 340 has negative refractive power, an object-side surface of the fourth lens 340 is convex in a paraxial region thereof, and an image-side surface of the fourth lens 340 is concave in a paraxial region thereof.

[0249] The fifth lens 350 has negative refractive power, an object-side surface of the fifth lens 350 is concave in a paraxial region thereof, and an image-side surface of the fifth lens 350 is convex in a paraxial region thereof.

[0250] The sixth lens 360 has positive refractive power, and the object-side surface and the image-side surface of the sixth lens 360 are convex in a paraxial region thereof.

[0251] The seventh lens 370 has negative refractive power, the object-side surface of the seventh lens 370 is concave in a paraxial region thereof, and the image-side surface of the seventh lens 370 is convex in a paraxial region thereof.

[0252] In addition, the third lens 330 and the fourth lens 340 may be combined with each other to form a cemented lens. The sixth lens 360 and the seventh lens 370 may be combined with each other to form a cemented lens.

[0253] Each surface of the first lens 310 has an aspherical coefficient as shown in the following Table 9. For example, the object-side surface and the image-side surface of the first lens 310 are aspherical.

[0254] Table 9

[0255] S1 S2 Cone constant (K) 1.289207 1.162132 Fourth coefficient (A) -9.92787E-05 1.50572E-04 Sixth coefficient (B) 1.00942E-05 2.09452E-05 Eighth coefficient (C) -3.42253E-07 -7.42242E-07 Tenth coefficient (D) -2.73513E-09 1.57232E-08 Twelfth coefficient (E) 5.53729E-10 7.59993E-10

[0256] Figure 4A is a configuration diagram of an optical imaging system according to a fourth embodiment when photographing an object at an infinite distance, and Figure 4Bis a configuration diagram of the optical imaging system according to the fourth embodiment when photographing an object at a near focus position (ie, the closest position of the object at which the optical imaging system can focus an image of the object).

[0257] Will refer to Figure 4A and Figure 4B An optical imaging system according to a fourth embodiment is described.

[0258] The optical imaging system according to the fourth embodiment includes a first lens group G1 and a second lens group G2. In addition, the optical imaging system includes a reflecting member P disposed in front of the second lens group G2.

[0259] In order from the object side, the first lens group G1 includes a first lens 410 , and the second lens group G2 includes a second lens 420 , a third lens 430 , a fourth lens 440 , a fifth lens 450 , a sixth lens 460 , and a seventh lens 470 .

[0260] The first lens group G1 may further include a reflective member P disposed between the first lens 410 and the second lens 420. An aperture may be disposed between the fourth lens 440 and the fifth lens 450.

[0261] The first lens 410 is made of a plastic material, and the second to seventh lenses 420 to 470 are made of a glass material.

[0262] In addition, the optical imaging system may further include a filter 480 and an image sensor.

[0263] The optical imaging system according to the fourth embodiment may form a focus on an imaging surface 490. The imaging surface 490 may refer to a surface on which a focus is formed by the optical imaging system. As an example, the imaging surface 490 may refer to one surface of an image sensor that receives light.

[0264] In the fourth embodiment, the reflective member P may be a prism, but may alternatively be a reflective mirror.

[0265] The first lens group G1 is fixedly disposed, and the second lens group G2 may be moved along the optical axis for focus adjustment.

[0266] The characteristics of each lens (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number, focal length, and effective radius) are shown in Table 10 below.

[0267] Table 10

[0268]

[0269]

[0270] Table 11

[0271]

[0272] In the above Table 11, D0 is the object distance, that is, the distance from the object to the object side surface of the first lens 410 on the optical axis, D1 is the distance between the reflecting member P and the second lens 420 on the optical axis, D2 is the distance between the seventh lens 470 and the filter 480 on the optical axis, and D3 is the distance between the filter 480 and the imaging surface 490 on the optical axis.

[0273] In addition, f is the total focal length of the optical imaging system, MAG is the magnification of the optical imaging system, FOV is the half field of view of the optical imaging system, Fno is the f-number of the optical imaging system, and L is the distance from the object side of the first lens 410 to the imaging surface 490 on the optical axis. The magnification may refer to the ratio of the size of an image to the size of an object.

[0274] In the fourth embodiment, the first lens group G1 has positive refractive power as a whole, and the second lens group G2 has positive refractive power as a whole.

[0275] The focal length fG1 of the first lens group G1 is 44.2579 mm, and the focal length fG2 of the second lens group G2 is 18.335 mm.

[0276] The effective radius of the object side surface of the first lens 410 of the first lens group G1 is greater than the effective radius of the image side surface. The effective radius of the object side surface of the first lens 410 is 4.519 mm.

[0277] In the second lens group G2, the effective radius of the image side surface of the seventh lens 470 is the largest, and the effective radius of the image side surface of the seventh lens 470 is 3.716 mm.

[0278] The first lens 410 has positive refractive power, an object-side surface of the first lens 410 is convex in a paraxial region thereof, and an image-side surface of the first lens 410 is concave in a paraxial region thereof.

[0279] The second lens 420 has positive refractive power, an object-side surface of the second lens 420 is convex in a paraxial region thereof, and an image-side surface of the second lens 420 is concave in a paraxial region thereof.

[0280] The third lens 430 has positive refractive power, and the object-side surface and the image-side surface of the third lens 430 are convex in a paraxial region thereof.

[0281] The fourth lens 440 has negative refractive power, and the object-side surface and the image-side surface of the fourth lens 440 are concave in a paraxial region thereof.

[0282] The fifth lens 450 has negative refractive power, an object-side surface of the fifth lens 450 is concave in a paraxial region thereof, and an image-side surface of the fifth lens 450 is convex in a paraxial region thereof.

[0283] The sixth lens 460 has positive refractive power, an object-side surface of the sixth lens 460 is concave in a paraxial region thereof, and an image-side surface of the sixth lens 460 is convex in a paraxial region thereof.

[0284] The seventh lens 470 has positive refractive power, an object-side surface of the seventh lens 470 is concave in a paraxial region thereof, and an image-side surface of the seventh lens 470 is convex in a paraxial region thereof.

[0285] In addition, the third lens 430 and the fourth lens 440 may be combined with each other to form a cemented lens. The sixth lens 460 and the seventh lens 470 may be combined with each other to form a cemented lens.

[0286] Each surface of the first lens 410 has an aspherical coefficient as shown in the following Table 12. For example, the object-side surface and the image-side surface of the first lens 410 are aspherical.

[0287] Table 12

[0288] S1 S2 Cone constant (K) 0.9770469 0.9585413 Fourth coefficient (A) -1.64295E-04 1.24680E-04 Sixth coefficient (B) 7.29153E-06 1.53377E-05 Eighth coefficient (C) -4.45966E-07 -3.29263E-07 Tenth coefficient (D) 6.56542E-09 3.90790E-09 Twelfth coefficient (E) 2.70274E-10 1.01983E-09

[0289] Figure 5A is a configuration diagram of an optical imaging system according to a fifth embodiment when photographing an object at an infinite distance, and Figure 5B is a configuration diagram of the optical imaging system according to the fifth embodiment when photographing an object at a near focus position (ie, the closest position of the object at which the optical imaging system can focus an image of the object).

[0290] Will refer to Figure 5A and Figure 5B An optical imaging system according to a fifth embodiment is described.

[0291] The optical imaging system according to the fifth embodiment includes a first lens group G1 and a second lens group G2. In addition, the optical imaging system includes a reflecting member P disposed in front of the second lens group G2.

[0292] In order from the object side, the first lens group G1 includes a first lens 510 , and the second lens group G2 includes a second lens 520 , a third lens 530 , a fourth lens 540 , and a fifth lens 550 .

[0293] The first lens group G1 may further include a reflective member P disposed between the first lens 510 and the second lens 520. An aperture may be disposed between the fourth lens 540 and the fifth lens 550.

[0294] The first lens 510 , the fourth lens 540 , and the fifth lens 550 are made of a plastic material, and the second lens 520 and the third lens 530 are made of a glass material.

[0295] In addition, the optical imaging system may further include a filter 580 and an image sensor.

[0296] The optical imaging system according to the fifth embodiment may form a focus on an imaging surface 590. The imaging surface 590 may refer to a surface on which a focus is formed by the optical imaging system. As an example, the imaging surface 590 may refer to one surface of an image sensor that receives light.

[0297] In the fifth embodiment, the reflective member P may be a prism, but may alternatively be a reflective mirror.

[0298] The first lens group G1 is fixedly disposed, and the second lens group G2 may be moved along the optical axis for focus adjustment.

[0299] The characteristics of each lens (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number, focal length, and effective radius) are shown in Table 13 below.

[0300] Table 13

[0301]

[0302]

[0303] Table 14

[0304]

[0305] In the above Table 14, D0 is the object distance, that is, the distance from the object to the object side surface of the first lens 510 on the optical axis, D1 is the distance on the optical axis between the reflective member P and the second lens 520, D2 is the distance on the optical axis between the fifth lens 550 and the filter 580, and D3 is the distance on the optical axis between the filter 580 and the imaging surface 590.

[0306] In addition, f is the total focal length of the optical imaging system, MAG is the magnification of the optical imaging system, FOV is the half angle of view of the optical imaging system, Fno is the f-number of the optical imaging system, and L is the distance from the object side surface of the first lens 510 to the imaging surface 590 on the optical axis. The magnification may refer to the ratio of the size of an image to the size of an object.

[0307] In the fifth embodiment, the first lens group G1 has positive refractive power as a whole, and the second lens group G2 has positive refractive power as a whole.

[0308] The focal length fG1 of the first lens group G1 is 38.0026 mm, and the focal length fG2 of the second lens group G2 is 18.335 mm.

[0309] The effective radius of the object side surface of the first lens 510 of the first lens group G1 is greater than the effective radius of the image side surface. The effective radius of the object side surface of the first lens 510 is 4.000 mm.

[0310] In the second lens group G2, the effective radius of the image side surface of the fifth lens 550 is the largest, and the effective radius of the image side surface of the fifth lens 550 is 3.146 mm.

[0311] The first lens 510 has positive refractive power, the object-side surface of the first lens 510 is convex in the paraxial region thereof, and the image-side surface of the first lens 510 is concave in the paraxial region thereof.

[0312] The second lens 520 has positive refractive power, the object-side surface of the second lens 520 is concave in the paraxial region thereof, and the image-side surface of the second lens 520 is convex in the paraxial region thereof.

[0313] The third lens 530 has positive refractive power, the object-side surface of the third lens 530 is concave in the paraxial region thereof, and the image-side surface of the third lens 530 is convex in the paraxial region thereof.

[0314] The fourth lens 540 has negative refractive power, an object-side surface of the fourth lens 540 is concave in a paraxial region thereof, and an image-side surface of the fourth lens 540 is convex in a paraxial region thereof.

[0315] The fifth lens 550 has positive refractive power, and the object-side surface and the image-side surface of the fifth lens 550 are convex in a paraxial region thereof.

[0316] Each surface of the first lens 510, the fourth lens 540, and the fifth lens 550 has an aspherical coefficient as shown in the following Table 15. For example, the object-side surface and the image-side surface of each of the first lens 510, the fourth lens 540, and the fifth lens 550 are aspherical.

[0317] Table 15

[0318]

[0319] Fig. 6A is a configuration diagram of an optical imaging system according to a sixth embodiment when photographing an object at an infinite distance, and Figure 6B is a configuration diagram of the optical imaging system according to the sixth embodiment when photographing an object at a near focus position (ie, the closest position of the object at which the optical imaging system can focus an image of the object).

[0320] Will refer to Fig. 6A and Figure 6B An optical imaging system according to a sixth embodiment is described.

[0321] The optical imaging system according to the sixth embodiment includes a first lens group G1 and a second lens group G2. In addition, the optical imaging system includes a reflecting member P disposed in front of the second lens group G2.

[0322] In order from the object side, the first lens group G1 includes a first lens 610 , and the second lens group G2 includes a second lens 620 , a third lens 630 , a fourth lens 640 , a fifth lens 650 , and a sixth lens 660 .

[0323] The first lens group G1 may further include a reflective member P disposed between the first lens 610 and the second lens 620. An aperture may be disposed between the reflective member P and the second lens 620.

[0324] The first to sixth lenses 610 to 660 are made of a plastic material.

[0325] In addition, the optical imaging system may further include a filter 680 and an image sensor.

[0326] The optical imaging system according to the sixth embodiment may form a focus on an imaging surface 690. The imaging surface 690 may refer to a surface on which a focus is formed by the optical imaging system. As an example, the imaging surface 690 may refer to one surface of an image sensor that receives light.

[0327] In the sixth embodiment, the reflective member P may be a prism, but may alternatively be a reflective mirror.

[0328] The first lens group G1 is fixedly disposed, and the second lens group G2 may be moved along the optical axis for focus adjustment.

[0329] The characteristics of each lens (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number, focal length, and effective radius) are shown in Table 16 below.

[0330] Table 16

[0331]

[0332]

[0333] Table 17

[0334]

[0335] In the above Table 17, D0 is the object distance, that is, the distance from the object to the object side surface of the first lens 610 on the optical axis, D1 is the distance on the optical axis between the reflective member P and the second lens 620, D2 is the distance on the optical axis between the sixth lens 660 and the filter 680, and D3 is the distance on the optical axis between the filter 680 and the imaging surface 690.

[0336] In addition, f is the total focal length of the optical imaging system, MAG is the magnification of the optical imaging system, FOV is the half field of view of the optical imaging system, Fno is the f-number of the optical imaging system, and L is the distance on the optical axis from the object side surface of the first lens 610 to the imaging surface 690. The magnification may refer to the ratio of the size of an image to the size of an object.

[0337] In the sixth embodiment, the first lens group G1 has positive refractive power as a whole, and the second lens group G2 has positive refractive power as a whole.

[0338] The focal length fG1 of the first lens group G1 is 44.8928 mm, and the focal length fG2 of the second lens group G2 is 23.662 mm.

[0339] The effective radius of the object side surface of the first lens 610 of the first lens group G1 is greater than the effective radius of the image side surface. The effective radius of the object side surface of the first lens 610 is 3.860 mm.

[0340] In the second lens group G2, the effective radius of the object-side surface of the second lens 620 is the largest, and the effective radius of the object-side surface of the second lens 620 is 2.830 mm.

[0341] The first lens 610 has positive refractive power, an object-side surface of the first lens 610 is convex in a paraxial region thereof, and an image-side surface of the first lens 610 is concave in a paraxial region thereof.

[0342] The second lens 620 has positive refractive power, and the object-side surface and the image-side surface of the second lens 620 are convex in a paraxial region thereof.

[0343] The third lens 630 has negative refractive power, and the object-side surface and the image-side surface of the third lens 630 are concave in a paraxial region thereof.

[0344] The fourth lens 640 has positive refractive power, an object-side surface of the fourth lens 640 is concave in a paraxial region thereof, and an image-side surface of the fourth lens 640 is convex in a paraxial region thereof.

[0345] The fifth lens 650 has positive refractive power, an object-side surface of the fifth lens 650 is concave in a paraxial region thereof, and an image-side surface of the fifth lens 650 is convex in a paraxial region thereof.

[0346] The sixth lens 660 has negative refractive power, and the object-side surface and the image-side surface of the sixth lens 660 are concave in a paraxial region thereof.

[0347] Each surface of the first to sixth lenses 610 to 660 has an aspherical coefficient as shown in the following Table 18. For example, the object-side surface and the image-side surface of each of the first to sixth lenses 610 to 660 are aspherical.

[0348] Table 18

[0349]

[0350]

[0351] Fig. 7A is a configuration diagram of an optical imaging system according to a seventh embodiment when photographing an object at an infinite distance, and Figure 7B is a configuration diagram of the optical imaging system according to the seventh embodiment when photographing an object at a near focus position (ie, the closest position of the object at which the optical imaging system can focus an image of the object).

[0352] Will refer to Fig. 7A and Figure 7B An optical imaging system according to a seventh embodiment is described.

[0353] The optical imaging system according to the seventh embodiment includes a first lens group G1 and a second lens group G2. In addition, the optical imaging system includes a reflecting member P disposed in front of the second lens group G2.

[0354] In order from the object side, the first lens group G1 includes a first lens 710 , and the second lens group G2 includes a second lens 720 , a third lens 730 , a fourth lens 740 , a fifth lens 750 , and a sixth lens 760 .

[0355] The first lens group G1 may further include a reflective member P disposed between the first lens 710 and the second lens 720. An aperture may be disposed between the third lens 730 and the fourth lens 740.

[0356] The first to sixth lenses 710 to 760 are made of a plastic material.

[0357] In addition, the optical imaging system may further include a filter 780 and an image sensor.

[0358] The optical imaging system according to the seventh embodiment may form a focus on an imaging surface 790. The imaging surface 790 may refer to a surface on which a focus is formed by the optical imaging system. As an example, the imaging surface 790 may refer to one surface of an image sensor that receives light.

[0359] In the seventh embodiment, the reflective member P may be a prism, but may alternatively be a reflective mirror.

[0360] The first lens group G1 is fixedly disposed, and the second lens group G2 may be moved along the optical axis for focus adjustment.

[0361] The characteristics of each lens (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number, focal length, and effective radius) are shown in Table 19 below.

[0362] Table 19

[0363]

[0364] Table 20

[0365]

[0366]

[0367] In the above Table 20, D0 is the object distance, that is, the distance from the object to the object side surface of the first lens 710 on the optical axis, D1 is the distance on the optical axis between the reflective member P and the second lens 720, D2 is the distance on the optical axis between the sixth lens 760 and the filter 780, and D3 is the distance on the optical axis between the filter 780 and the imaging surface 790.

[0368] In addition, f is the total focal length of the optical imaging system, MAG is the magnification of the optical imaging system, FOV is the half angle of view of the optical imaging system, Fno is the f-number of the optical imaging system, and L is the distance from the object side surface of the first lens 710 to the imaging surface 790 on the optical axis. The magnification may refer to the ratio of the size of an image to the size of an object.

[0369] In the seventh embodiment, the first lens group G1 has positive refractive power as a whole, and the second lens group G2 has positive refractive power as a whole.

[0370] The focal length fG1 of the first lens group G1 is 44.3000 mm, and the focal length fG2 of the second lens group G2 is 28.046 mm.

[0371] The effective radius of the object-side surface of the first lens 710 of the first lens group G1 is greater than the effective radius of the image-side surface of the first lens 710. The effective radius of the object-side surface of the first lens 710 is 3.600 mm.

[0372] In the second lens group G2, the effective radius of the object-side surface of the second lens 720 is the largest, and the effective radius of the object-side surface of the second lens 720 is 2.868 mm.

[0373] The first lens 710 has positive refractive power, an object-side surface of the first lens 710 is convex in a paraxial region thereof, and an image-side surface of the first lens 710 is concave in a paraxial region thereof.

[0374] The second lens 720 has positive refractive power, and the object-side surface and the image-side surface of the second lens 720 are convex in a paraxial region thereof.

[0375] The third lens 730 has negative refractive power, and the object-side surface and the image-side surface of the third lens 730 are concave in a paraxial region thereof.

[0376] The fourth lens 740 has negative refractive power, an object-side surface of the fourth lens 740 is concave in a paraxial region thereof, and an image-side surface of the fourth lens 740 is convex in a paraxial region thereof.

[0377] The fifth lens 750 has positive refractive power, and the object-side surface and the image-side surface of the fifth lens 750 are convex in a paraxial region thereof.

[0378] The sixth lens 760 has negative refractive power, and the object-side surface and the image-side surface of the sixth lens 760 are concave in a paraxial region thereof.

[0379] Each surface of the first to sixth lenses 710 to 760 has an aspherical coefficient as shown in the following Table 21. For example, the object-side surface and the image-side surface of each of the first to sixth lenses 710 to 760 are aspherical.

[0380] Table 21

[0381]

[0382] Table 22 below lists the values ​​of D11P, D12P, DP21, DR, DL2, L2S1_ED, RG1_S1, RG1_S2, RG2_S1, fG1, fG2, Lf, Lr, G1_MED, G2_MED, and PED in Conditional Expression 1 to Conditional Expression 21. Figure 1A , Figure 2A , Figure 3A , Figure 4A , Figure 5A , Fig. 6A and Fig. 7A As shown in , the value of DP21 is the value when the second lens group G2 is at the position closest to the imaging plane when the optical imaging system photographs an object at an infinite distance.

[0383] Table 22

[0384]

[0385] As described above, with the optical imaging system according to the embodiment, the size of the optical imaging system can be reduced, and a high-resolution image can be captured.

[0386] Although the present disclosure includes specific examples, it will be apparent that various changes in form and detail may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The description of features or aspects in each example is considered applicable to similar features or aspects in other examples. Suitable results may also be obtained if the described techniques are performed in a different order, and / or if components in the described systems, architectures, devices, or circuits are combined in different ways and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of the present disclosure is not limited by specific embodiments, but by the claims and their equivalents, and all changes within the scope of the claims and their equivalents will be interpreted as included in the present disclosure.

Claims

1. An optical imaging system, comprising: A first lens group, including a reflecting member and one or two lenses disposed in front of the reflecting member; A second lens group, disposed behind the reflecting member and including a plurality of lenses; And An image sensor configured to convert an image incident on a surface of the image sensor of an object into an electrical signal, Wherein, the one or two lenses included in the first lens group generally have a positive refractive power, An image side surface of the lens closest to the reflecting member among the one or two lenses of the first lens group is concave, The reflecting member includes an incident surface, a reflecting surface, and an exit surface, and Satisfies 0.25 ≤ D12P / DR ≤ 1.0, where D12P is the distance on the optical axis of the optical imaging system from the image side surface of the lens closest to the reflecting member among the one or two lenses of the first lens group to the incident surface of the reflecting member, and DR is the distance on the optical axis from the incident surface of the reflecting member to the reflecting surface of the reflecting member.

2. The optical imaging system according to claim 1, wherein: The reflecting member is configured to be rotatable about two axes perpendicular to each other.

3. The optical imaging system according to claim 1, wherein: The one or two lenses included in the first lens group include a first lens having an object side surface convex in its paraxial region and an image side surface concave in its paraxial region, and An effective diameter of the object side surface of the first lens and an effective diameter of the image side surface of the first lens are greater than a minor axis length of the incident surface of the reflecting member.

4. The optical imaging system according to claim 3, wherein: Satisfies 0.6 < RG1_S1 / RG1_S2 < 0.8, where RG1_S1 is the radius of curvature of the object side surface of the first lens, and RG1_S2 is the radius of curvature of the image side surface of the first lens.

5. The optical imaging system according to claim 1, wherein: Satisfies 1.3 < fG1 / fG2 < 3, where fG1 is the focal length of the first lens group, and fG2 is the focal length of the second lens group.

6. The optical imaging system according to claim 1, wherein: Satisfies 0.35 ≤ DR / L2S1_ED ≤ 0.65, where L2S1_ED is the effective diameter of the object side surface of the lens closest to the reflecting member among the plurality of lenses included in the second lens group.

7. The optical imaging system according to claim 1, wherein: Satisfies 0.65 ≤ D11P / DR ≤ 1.55, where D11P is the distance on the optical axis from the object side surface of the lens closest to the object side of the optical imaging system among the one or two lenses included in the first lens group to the incident surface of the reflecting member.

8. The optical imaging system according to claim 1, wherein: Satisfies -0.25 ≤ (RG1_S1 - RG1_S2) / (RG1_S1 + RG1_S2) < 0, where RG1_S1 is the radius of curvature of the object side surface of the lens closest to the object side of the optical imaging system among the one or two lenses included in the first lens group, and RG1_S2 is the radius of curvature of the image side surface of the lens closest to the reflecting member among the one or two lenses included in the first lens group.

9. The optical imaging system according to claim 1, wherein: Satisfy -0.6 ≤ RG2_S1 / fG2 ≤ 2.1, where RG2_S1 is the radius of curvature of the object side surface of the lens closest to the reflection member among the plurality of lenses included in the second lens group, and fG2 is the focal length of the second lens group.

10. The optical imaging system according to claim 1, wherein: Satisfy 0.7 ≤ DP21 / DR ≤ 1.6, where DP21 is the distance on the optical axis from the exit surface of the reflection member to the object side surface of the lens closest to the reflection member among the plurality of lenses included in the second lens group.

11. The optical imaging system according to claim 10, wherein: Satisfy 0 < D12P / L < 0.1, 0 < DP21 / L ≤ 0.2, and 0.3 < D12P / DP21 < 0.6, where L is the sum of the distance on the optical axis from the object side surface of the lens closest to the object side of the optical imaging system among the one or two lenses included in the first lens group to the reflection surface of the reflection member and the distance on the optical axis from the reflection surface of the reflection member to the imaging surface of the optical imaging system.

12. The optical imaging system according to claim 1, wherein: Satisfy 1.1 ≤ fG1 / L ≤ 1.9, where fG1 is the focal length of the first lens group, and L is the sum of the distance on the optical axis from the object side surface of the lens closest to the object side of the optical imaging system among the one or two lenses included in the first lens group to the reflection surface of the reflection member and the distance on the optical axis from the reflection surface of the reflection member to the imaging surface of the optical imaging system.

13. The optical imaging system according to claim 1, wherein: Satisfy 0.1 ≤ Lf / Lr ≤ 0.4, where Lf is the distance on the optical axis from the object side surface of the lens closest to the object side of the optical imaging system among the one or two lenses included in the first lens group to the reflection surface of the reflection member, and Lr is the distance on the optical axis from the reflection surface of the reflection member to the imaging surface of the optical imaging system.

14. The optical imaging system according to claim 1, wherein: Satisfy 0.25 < G1_MED / Lr < 0.42 and 0.7 < G2_MED / Lf < 1.4, where G1_MED is the maximum effective diameter of the one or two lenses included in the first lens group, and G2_MED is the maximum effective diameter of the plurality of lenses included in the second lens group.

15. The optical imaging system of claim 1, wherein: Satisfy 0.35 < f / fG1 ≤ 0.5, where f is the total focal length of the optical imaging system, and fG1 is the focal length of the first lens group.

16. The optical imaging system of claim 1, wherein: Satisfy 0.6 < f / fG2 ≤ 1.1, where f is the total focal length of the optical imaging system, and fG2 is the focal length of the second lens group.

17. The optical imaging system of claim 1, wherein: The lens closest to the reflection member among the plurality of lenses in the second lens group has a positive refractive power.

18. The optical imaging system of claim 1, wherein: At least three lenses among the plurality of lenses in the second lens group have a refractive index greater than 1.

6.

19. An optical imaging system, comprising: A first lens group, including a reflection member and one or two lenses disposed in front of the reflection member; A second lens group, disposed behind the reflection member and including a plurality of lenses; And An image sensor configured to convert an image incident on a surface of the image sensor of an object into an electrical signal, wherein one or two lenses of the first lens group generally have a positive refractive power, an image side surface of a lens of the one or two lenses of the first lens group that is disposed closest to the reflecting member is concave, the reflecting member includes an incident surface, a reflecting surface, and an exit surface, and 0.7 ≤ DP21 / DR ≤ 1.6 is satisfied, where DP21 is a distance on an optical axis of the optical imaging system from the exit surface of the reflecting member to an object side surface of a lens of the plurality of lenses of the second lens group that is disposed closest to the reflecting member, and DR is a distance on the optical axis from the incident surface of the reflecting member to the reflecting surface of the reflecting member.

20. The optical imaging system of claim 19, wherein: There is a total of one lens having a refractive power in the first lens group, and there are a total of four, five, or six lenses having a refractive power in the second lens group.

21. The optical imaging system of claim 20, wherein: The one lens of the first lens group is a first lens, the first lens has a positive refractive power, has a convex object side surface in its paraxial region and has a concave image side surface in its paraxial region, and the four, five, or six lenses of the second lens group include a second lens of the four, five, or six lenses of the second lens group that is disposed closest to the reflecting member and has a positive refractive power.

22. The optical imaging system of claim 21, wherein: There are a total of five lenses having a refractive power in the second lens group, and the five lenses include the second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens having a positive or negative refractive power, a fifth lens having a positive refractive power, and a sixth lens having a positive or negative refractive power.

23. The optical imaging system of claim 19, wherein: The plurality of lenses of the second lens group are configured such that lenses disposed adjacent to each other among the plurality of lenses have different refractive indices and different Abbe numbers.

24. An optical imaging system, comprising: a first lens group including a reflecting member and one or two lenses disposed in front of the reflecting member; a second lens group disposed behind the reflecting member and including a plurality of lenses; and an image sensor configured to convert an image incident on a surface of the image sensor of an object into an electrical signal, wherein one or two lenses of the first lens group generally have a positive refractive power, an image side surface of a lens of the one or two lenses of the first lens group that is disposed closest to the reflecting member is concave, the reflecting member includes an incident surface, a reflecting surface, and an exit surface, and 0.3 < D12P / DP21 < 0.6 is satisfied, where D12P is a distance on an optical axis of the optical imaging system from an image side surface of a lens of the one or two lenses of the first lens group that is disposed closest to the reflecting member to the incident surface of the reflecting member, and DP21 is a distance on the optical axis from the exit surface of the reflecting member to an object side surface of a lens of the plurality of lenses of the second lens group that is disposed closest to the reflecting member.

25. The optical imaging system of claim 24, wherein: There is a total of one lens having refractive power in the first lens group, and there are a total of four, five or six lenses having refractive power in the second lens group.

26. The optical imaging system of claim 25, wherein: The one lens of the first lens group is a first lens having positive refractive power, having a convex object-side surface in a paraxial region thereof and having a concave image-side surface in a paraxial region thereof, and The four, five or six lenses of the second lens group include a second lens, which is closest to the reflecting member and has positive refractive power, among the four, five or six lenses of the second lens group.

27. The optical imaging system of claim 26, wherein: There are a total of six lenses having refractive power in the second lens group, and The six lenses include the second lens having positive refractive power, the third lens having positive refractive power, the fourth lens having negative refractive power, the fifth lens having negative refractive power, the sixth lens having positive refractive power, and the seventh lens having positive or negative refractive power.

28. The optical imaging system of claim 24, wherein: The first lens group is arranged at a fixed position on the optical axis, and The second lens group is configured to be movable along the optical axis relative to the first lens group to adjust the focus of the optical imaging system.

Images