Optical image capturing system

Abstract

The optical imaging system includes: a first lens group having a positive refractive power and including at least one lens; a second lens group including a plurality of lenses; and a reflective member disposed between the first lens group and the second lens group and including a reflective surface, in which the first lens group and the reflective member are configured to be rotatable together about two axes perpendicular to an optical axis of the first lens group and perpendicular to each other, and the optical imaging system satisfies 1.3 lt; f / fG1lt; f is the total focal length of the optical imaging system, and fG1 is the focal length of the first lens group.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2023-0165147 filed on November 24, 2023, in the Korean Intellectual Property Office, and Korean Patent Application No. 10-2024-0084489 filed on June 27, 2024, in the Korean Intellectual Property Office, the disclosures of which are incorporated herein in their entirety by reference for all purposes. Technical Field

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

[0004] Recently, a camera module in which a reflective member is provided in front of an optical imaging system to change a path of light has been adopted for use in a portable electronic device.

[0005] Since the diameter of the lens affects the thickness of the portable electronic device, this method has a limitation in increasing the diameter of the lens of the optical imaging system. Therefore, there may be a problem that it may be difficult to reduce the F number of the optical imaging system.

[0006] Therefore, a structure has been proposed in which a part of the lens of the optical imaging system is disposed in front of the reflective member.

[0007] Meanwhile, in order to improve the resolution, the camera module including the optical imaging system has an optical image stabilization adjustment function for correcting the shaking during image capture. The optical image stabilization adjustment function can be realized by the biaxial rotation of the reflective member. In this case, the biaxial rotation can be realized by the pitch rotation and the yaw rotation. In addition, when the lens is disposed in front of the reflective member, the lens can rotate together with the reflective member.

[0008] In this case, the pitch rotation axis and the yaw rotation axis are two axes that are perpendicular to the optical axis of the lens arranged behind the reflection member and are perpendicular to each other.

[0009] Rotation around the yaw rotation axis can be achieved by rotating the reflecting member around the direction in which light is incident on the reflecting member as the rotation axis, and rotation around the pitch rotation axis can be achieved by rotating the reflecting member around an axis perpendicular to both the yaw rotation axis and the optical axis of a lens arranged behind the reflecting member as the rotation axis.

[0010] In this case, when the reflective member is rotated in a yaw rotation, an error may occur as the expected optical path length changes.

[0011] In the yaw rotation during the two-axis rotation, the lens disposed in front of the reflecting member does not change significantly in terms of its apparent position before and after the yaw rotation.

[0012] Therefore, when performing optical image stabilization adjustment in the yaw direction, there may be a problem of significant aberration occurring during the optical image stabilization adjustment, thereby reducing the resolution. SUMMARY OF THE INVENTION

[0013] The present invention content section is provided to briefly introduce the selection of concepts, which will be further described in the following detailed implementation section. The present invention content section is not intended to identify the key features or essential features of the claimed subject matter, nor is it intended to assist in determining the scope of the claimed subject matter.

[0014] In one general aspect, an optical imaging system includes: a first lens group having a positive refractive power and including at least one lens; a second lens group including a plurality of lenses; and a reflecting member disposed between the first lens group and the second lens group and including a reflecting surface, wherein the first lens group and the reflecting member are configured to rotate together about two axes perpendicular to the optical axis of the first lens group and perpendicular to each other, and the optical imaging system satisfies 1.3 < f / fG1 < 1.8, where f is the total focal length of the optical imaging system, and fG1 is the focal length of the first lens group.

[0015] The optical imaging system may further satisfy 0.07 [1 / mm] ≤ PG1 < 0.1 [1 / mm], where PG1 is the reciprocal of the focal length of the first lens group.

[0016] The optical imaging system may further satisfy 0.6 < Lr / f < 0.8, where Lr is the distance along the optical axis of the optical imaging system from the reflecting surface to the image plane of the optical imaging system.

[0017] The optical imaging system may further satisfy 0.3 < Lf / Lr < 0.6, where Lf is the distance along the optical axis of the optical imaging system from the object side surface of the lens closest to the object side among at least one lens of the first lens group to the reflecting surface, and Lr is the distance along the optical axis of the optical imaging system from the reflecting surface to the image plane of the optical imaging system.

[0018] The optical imaging system may further satisfy 0.6 < Lr / TTL < 0.8, where Lr is the distance along the optical axis of the optical imaging system from the reflecting surface to the image plane of the optical imaging system, and TTL is the sum of the distance along the optical axis of the optical imaging system from the object side surface of the lens closest to the object side among at least one lens of the first lens group to the reflecting surface and the distance along the optical axis of the optical imaging system from the reflecting surface to the image plane.

[0019] The optical imaging system can also satisfy 0.2 < BFL / TTL < 0.5, where BFL is the distance from the image side of the lens closest to the image plane among the multiple lenses of the second lens group along the optical axis of the optical imaging system to the image plane, and TTL is the sum of the distance from the object side of the lens closest to the object side of the optical imaging system among the at least one lens of the first lens group along the optical axis of the optical imaging system to the reflection surface and the distance from the reflection surface to the image plane along the optical axis of the optical imaging system.

[0020] The optical imaging system can also satisfy 0 < DG2 / TTL < 0.2, where DG2 is the distance from the object side of the lens closest to the reflection member among the multiple lenses of the second lens group to the image side of the lens closest to the image plane among the multiple lenses of the second lens group along the optical axis of the optical imaging system, and TTL is the sum of the distance from the object side of the lens closest to the object side of the optical imaging system among the at least one lens of the first lens group along the optical axis of the optical imaging system to the reflection surface and the distance from the reflection surface to the image plane along the optical axis of the optical imaging system.

[0021] The optical imaging system can also satisfy 0.3 < CA_G21 / CA_G11 < 0.6, where CA_G21 is the effective diameter of the object side of the lens closest to the reflection member among the multiple lenses of the second lens group, and CA_G11 is the effective diameter of the object side of the lens closest to the object side of the optical imaging system among the at least one lens of the first lens group.

[0022] The optical imaging system can also satisfy 2.8 < f / CA_G11 < 3.2, where CA_G11 is the effective diameter of the object side of the lens closest to the object side of the optical imaging system among the at least one lens of the first lens group.

[0023] The optical imaging system can also satisfy 0.4 < |fG1 / fG2| < 1, where fG2 is the focal length of the second lens group.

[0024] The second lens group can have a negative refractive power.

[0025] The optical imaging system can also satisfy -1.4 < f / fG2 < -0.6, where fG2 is the focal length of the second lens group.

[0026] The optical imaging system can also satisfy 0.2 < RG1_S1 / fG1 < 0.6, 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 the at least one lens of the first lens group.

[0027] The optical imaging system can also satisfy 0.5 < fG1 / TTL < 0.9, where TTL is the sum of the distance along the optical axis of the optical imaging system from the object surface of the lens closest to the object side among at least one lens of the first lens group to the reflection surface and the distance along the optical axis of the optical imaging system from the reflection surface to the image plane of the optical imaging system.

[0028] At least one lens of the first lens group may include a first lens and a second lens, and at least one of the first lens and the second lens has a refractive index greater than 1.6, a convex object surface in its paraxial region, and a concave image surface in its paraxial region.

[0029] The first lens may have a positive refractive power and a refractive index less than 1.55, and the second lens may have a negative refractive power.

[0030] The lens closest to the image plane among the multiple lenses of the second lens group has a positive refractive power and a refractive index greater than 1.6, and at least one other lens among the multiple lenses of the second lens group, except for the lens closest to the image plane among the multiple lenses of the second lens group, has a refractive index greater than 1.6.

[0031] In another general aspect, the optical imaging system includes: a first lens group having a positive refractive power and including at least one lens; a second lens group including multiple lenses; and a reflection member disposed between the first lens group and the second lens group and including a reflection surface, wherein the first lens group and the reflection member are configured to rotate together about two axes perpendicular to the optical axis of the first lens group and perpendicular to each other, and the optical imaging system satisfies 0.2 < BFL / TTL < 0.5, where BFL is the distance along the optical axis of the optical imaging system from the image surface of the lens closest to the image plane among the multiple lenses of the second lens group to the image plane, and TTL is the sum of the distance along the optical axis of the optical imaging system from the object surface of the lens closest to the object side among at least one lens of the first lens group to the reflection surface and the distance along the optical axis of the optical imaging system from the reflection surface to the image plane.

[0032] The optical imaging system can also satisfy 0.4 < |fG1 / fG2| < 1, where fG1 is the focal length of the first lens group and fG2 is the focal length of the second lens group.

[0033] The optical imaging system can also satisfy 0.3 < Lf / Lr < 0.6, where Lf is the distance along the optical axis of the optical imaging system from the object surface of the lens closest to the object side among at least one lens of the first lens group to the reflection surface, and Lr is the distance along the optical axis of the optical imaging system from the reflection surface to the image plane.

[0034] The optical imaging system can also satisfy 0.5 < fG1 / TTL < 0.9, where fG1 is the focal length of the first lens group.

[0035] In another general aspect, the optical imaging system includes a first lens group having positive refractive power and including at least one lens, a second lens group including a plurality of lenses, and a reflecting member disposed between the first lens group and the second lens group and including a reflecting surface. The first lens group and the reflecting member are configured to rotate together about two axes perpendicular to the optical axis of the first lens group and perpendicular to each other, and the optical imaging system satisfies 0.3 < CA_G21 / CA_G11 < 0.6, where CA_G21 is the effective diameter of the object side surface of the lens closest to the reflecting member among the plurality of lenses of the second lens group, and CA_G11 is the effective diameter of the object side surface of the lens closest to the object side of the optical imaging system among the at least one lens of the first lens group.

[0036] The optical imaging system can also satisfy 0.07 [1 / mm] ≤ PG1 < 0.1 [1 / mm], where PG1 is the reciprocal of the focal length of the first lens group.

[0037] The optical imaging system can also satisfy 0.2 < RG1_S1 / fG1 < 0.6, 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 at least one lens of the first lens group, and fG1 is the focal length of the first lens group.

[0038] The optical imaging system can also satisfy 2.8 < f / CA_G11 < 3.2, where f is the total focal length of the optical imaging system.

[0039] Other features and aspects will be apparent from the accompanying drawings and the following detailed description. Description of the Drawings

[0040] Figure 1 is a configuration diagram of an optical imaging system according to a first embodiment of the present disclosure.

[0041] Figure 2 is a configuration diagram of an optical imaging system according to a second embodiment of the present disclosure.

[0042] Figure 3 is a configuration diagram of an optical imaging system according to a third embodiment of the present disclosure.

[0043] Figure 4 is a configuration diagram of an optical imaging system according to a fourth embodiment of the present disclosure.

[0044] Figure 5is a configuration diagram of an optical imaging system according to a fifth embodiment of the present disclosure.

[0045] Throughout the drawings and detailed description, the same reference numerals refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative sizes, proportions, and depictions of elements in the drawings may be exaggerated. DETAILED DESCRIPTION

[0046] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent after understanding the disclosure of the present application. For example, the order of operations described herein is merely an example, and except for operations that must occur in a specific order, it is not limited to the order set forth herein, but can be changed, which will be apparent after understanding the disclosure of the present application. In addition, for greater clarity and brevity, the description of features known in the art may be omitted.

[0047] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein are provided merely 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.

[0048] Throughout the specification, when an element such as a layer, a region, or a substrate is described as being “on,” “connected to,” or “coupled to” another element, the element may be directly “on,” “connected to,” or “coupled to” the other element, or one or more other elements may be present between the element and the other element. Conversely, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, no other elements may be present between the element and the other element.

[0049] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0050] 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. Rather, these terms are only used to distinguish one member, component, region, layer or portion from another member, component, region, layer or portion. Therefore, without departing from the teachings of the examples described herein, the first member, first component, first region, first layer or first portion mentioned in these examples may also be referred to as the second member, second component, second region, second layer or second portion.

[0051] Spatially relative terms such as "above", "above", "below", and "below" may be used herein for descriptive convenience to describe the relationship of one element relative to another element as shown in the accompanying drawings. In addition to covering the orientations depicted in the accompanying drawings, these spatially relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the accompanying drawings is flipped, an element described as being "above" or "above" another element relative to the other element will be "below" or "below" the other element relative to the other element. Therefore, depending on the spatial orientation of the device, the term "above" covers both orientations of "above" and "below". The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.

[0052] The terms used herein are only used to describe various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the terms "a", "an" and "the" are intended to include plural forms as well. The terms "include", "comprise" and "have" indicate the presence of the 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.

[0053] In the lens configuration diagrams in the accompanying drawings, the thickness, size, and shape of the lenses may be slightly exaggerated for explanation, and in particular, the spherical shape or aspherical shape shown in the lens configuration diagrams is merely illustrative and not limited to such shapes.

[0054] The optical imaging system according to an embodiment of the present disclosure may be installed on a portable electronic device. For example, the optical imaging system may be a component of a camera module installed on a portable electronic device. The portable electronic device may be a mobile communication terminal, a smart phone, a tablet PC or other portable devices.

[0055] In this specification, the radius of curvature, thickness, distance and focal length of the lens and other measurements are expressed in mm, and the field of view angle is expressed in degrees. The thickness and distance are measured along the optical axis of the optical imaging system.

[0056] Unless otherwise specified, references to the shape of a lens surface refer to the shape of a paraxial region of the lens surface. The paraxial region of the lens surface is the central portion of the lens surface surrounding and including the optical axis of the lens surface, in which light rays incident on the lens surface form a small angle θ with the optical axis, and the approximations of sinθ≈θ, tanθ≈θ, and cosθ≈1 are valid.

[0057] For example, the statement that the object side surface of the lens is convex means that at least the paraxial region of the object side surface of the lens is convex, and the statement that the image side surface of the lens is concave means that at least the paraxial region of the image side surface of the lens is concave. Therefore, even if the object side surface of the lens can be described as convex, the entire object side surface of the lens may not be convex, and the peripheral region of the object side surface of the lens may be concave. In addition, even if the image side surface of the lens can be described as concave, the entire image side surface of the lens may not be concave, and the peripheral region of the image side surface of the lens may be convex.

[0058] The image plane may be a virtual surface on which an image is focused by an optical imaging system. Alternatively, the image plane may be a surface on which light of an image sensor is incident.

[0059] The optical imaging system according to an embodiment of the present disclosure may include multiple lens groups. For example, the optical imaging system may include a first lens group and a second lens group. The first lens group may include at least one lens, and the second lens group may include multiple lenses.

[0060] In an embodiment, the first lens group may include a first lens, a second lens, and a third lens, and the second lens group may include a fourth lens, a fifth lens, and a sixth lens. The first to sixth lenses may be arranged in ascending numerical order from the object side of the optical imaging system toward the image plane of the optical imaging system.

[0061] In an embodiment, the first lens group may include a first lens and a second lens, and the second lens group may include a third lens, a fourth lens, and a fifth lens. The first to fifth lenses may be arranged in ascending numerical order from the object side of the optical imaging system toward the image plane of the optical imaging system.

[0062] In an embodiment, the first lens group may include a first lens and a second lens, and the second lens group may include a third lens, a fourth lens, a fifth lens, and a sixth lens. The first to sixth lenses may be arranged in ascending numerical order from the object side of the optical imaging system toward the image plane of the optical imaging system.

[0063] A plurality of lenses included in the optical imaging system may be spaced apart from each other in an optical axis direction.

[0064] The optical imaging system according to an embodiment of the present disclosure may further include a reflective member having a reflective surface that changes the propagation direction of light. For example, the reflective member may be a reflector or a prism. In an embodiment, the reflective member may be disposed between the first lens group and the second lens group.

[0065] When the reflective member is a prism, the reflective member may have a shape in which a rectangular parallelepiped shape or a cube shape is diagonally divided into two halves. The reflective member may include an incident surface, a reflecting surface, and an exiting surface. The reflective member may include three quadrilateral surfaces and two triangular surfaces. For example, the incident surface, the reflecting surface, and the exiting surface of the reflective member may each be a quadrilateral, and the two side surfaces of the reflective member may be approximately triangular.

[0066] The light passing through the first lens group may be incident on the incident surface of the reflection member, the light incident on the incident surface may be reflected on the reflection surface, and the light reflected on the reflection surface may be emitted to the exit surface.

[0067] The optical axis of the first lens group and the optical axis of the second lens group may intersect each other. For example, an imaginary line extending the optical axis of the first lens group and an imaginary line extending the optical axis of the second lens group may intersect each other.

[0068] In an embodiment, an optical axis of the first lens group and an optical axis of the second lens group may be perpendicular to each other.

[0069] Light may be bent by the reflective member to form a long light path in a relatively narrow space.

[0070] Therefore, the optical imaging system can be miniaturized while allowing the optical imaging system to have a long focal length.

[0071] The optical imaging system according to an embodiment of the present disclosure may have characteristics of a telephoto lens having a relatively narrow angle of view and a long focal length.

[0072] In addition, the optical imaging system may further include an image sensor for converting an image of the object incident on the image sensor into an electrical signal.

[0073] In addition, the optical imaging system may further include an infrared blocking filter (hereinafter referred to as a filter) for blocking infrared rays. The filter may be disposed between the last lens (eg, the fifth lens or the sixth lens) and the image sensor.

[0074] The first lens group may have positive refractive power as a whole, and may include at least one lens having a meniscus shape convex toward the object side.

[0075] The first lens group may include at least one lens having a refractive index exceeding 1.6. Among the lenses included in the first lens group, the lens having a refractive index exceeding 1.6 may have a meniscus shape convex toward the object side.

[0076] In an embodiment, the second lens may have a refractive index exceeding 1.6 and a meniscus shape convex toward the object side. The second lens may have a negative refractive power. The first lens may have a positive refractive power and a refractive index smaller than the refractive index of the second lens. For example, the refractive index of the first lens may be less than 1.55.

[0077] An effective diameter of an object-side surface and an effective diameter of an image-side surface of each of at least one lens included in the first lens group may be greater than a length of a minor axis of an incident surface of the reflecting member.

[0078] Each of the at least one lens included in the first lens group may be approximately circular when viewed in the optical axis direction of the first lens group.

[0079] Each of the at least one lens included in the first lens group may be made of a plastic material.

[0080] The second lens group as a whole may have negative refractive power.

[0081] The second lens group may include at least two lenses having a refractive index exceeding 1.6. In an embodiment, the lens of the second lens group closest to the image sensor may have a refractive index exceeding 1.6. The lens of the second lens group closest to the image sensor may have a positive refractive power.

[0082] In an embodiment, at least two lenses of the second lens group (including the lens of the second lens group closest to the image sensor) may have a refractive index exceeding 1.6.

[0083] When viewed in the optical axis direction of the second lens group, lenses included in the second lens group may be approximately non-circular.

[0084] The lenses included in the second lens group may have different sizes in two directions perpendicular to the optical axis direction of the second lens group and perpendicular to each other.

[0085] The lenses included in the second lens group may be made of a plastic material.

[0086] The reflective member may be disposed in front of the second lens group. To correct shake during image capture, the reflective member may rotate about two axes.

[0087] For example, when shaking occurs in capturing an image or shooting a video due to factors such as hand shaking of a user or other disturbances, the reflection member rotates in response to the shaking, thereby compensating for the shaking.

[0088] The reflecting member may rotate about two axes perpendicular to the optical axis of the first lens group and perpendicular to each other as rotation axes.

[0089] In an embodiment, the reflecting member can rotate around an axis perpendicular to both the optical axis of the first lens group and the optical axis of the second lens group (or an axis parallel thereto) as a rotation axis (pitch rotation axis), and can rotate around the optical axis of the second lens group (or an axis parallel to the optical axis of the second lens group) as a rotation axis (roll rotation axis).

[0090] Since the first lens group having positive refractive power is disposed in front of the reflective member, light incident on the reflective member can be converged, and thus the diameter of the second lens group can be configured to be small. Therefore, the height of the optical imaging system can be reduced while reducing the Fno (F number, f number) of the optical imaging system.

[0091] In addition, the first lens group can rotate together with the reflection member. In this case, since the first lens group and the reflection member can rotate in a pitch rotation manner and a roll rotation manner, aberrations occurring during optical image stabilization adjustment can be reduced. In addition, the refractive power of the first lens group can be designed to be relatively large to reduce the height of the second lens group.

[0092] In an embodiment, at least one lens included in the first lens group and a plurality of lenses included in the second lens group may have aspherical surfaces on object-side surfaces and image-side surfaces thereof.

[0093] The aspherical surface of the lens can be expressed by the following Equation 1.

[0094] Equation 1:

[0095]

[0096] 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 an arbitrary point on the aspherical surface of the lens to the optical axis. In addition, the constants A to H, J, and L are aspherical surface coefficients. Z (also referred to as the sag) is the distance in the direction parallel to the optical axis between a point at a distance Y from the optical axis of the aspherical surface on the aspherical surface of the lens and a tangent plane perpendicular to the optical axis and intersecting the vertex of the aspherical surface.

[0097] The optical imaging system according to an embodiment of the present disclosure may satisfy any one or any combination of any two or more of the following conditional expressions 1 to 13.

[0098] 0.07 [1 / mm] ≤ PG1 < 0.1 [1 / mm] (Conditional Expression 1)

[0099] 1.3 < f / fG1 < 1.8 (Conditional Expression 2)

[0100] 0.6 < Lr / f < 0.8 (Conditional Expression 3)

[0101] 0.6 < Lr / TTL < 0.8 (Conditional Expression 4)

[0102] 0.3 < CA_G21 / CA_G11 < 0.6 (Conditional Expression 5)

[0103] 0.2 < BFL / TTL < 0.5 (Conditional Expression 6)

[0104] 0.4 < |fG1 / fG2| < 1 (Conditional Expression 7)

[0105] -1.4 < f / fG2 < -0.6 (Conditional Expression 8)

[0106] 0.2 < RG1_S1 / fG1 < 0.6 (Conditional Expression 9)

[0107] 0.3 < Lf / Lr < 0.6 (Conditional Expression 10)

[0108] 0 < DG2 / TTL < 0.2 (Conditional Expression 11)

[0109] 0.5 < fG1 / TTL < 0.9 (Conditional Expression 12)

[0110] 2.8 < f / CA_G11 < 3.2 (Conditional Expression 13)

[0111] In an embodiment, the optical imaging system may satisfy 0.07 [1 / mm] ≤ PG1 < 0.1 [1 / mm] (conditional expression 1). In this case, PG1 is the reciprocal of the focal length of the first lens group. Therefore, the focal length of the first lens group can be optimized to reduce the size of the reflection member and the size of the second lens group.

[0112] In an embodiment, the optical imaging system may satisfy 1.3 < f / fG1 < 1.8 (conditional expression 2). In this case, f is the total focal length of the optical imaging system, and fG1 is the focal length of the first lens group. Therefore, the focal length of the first lens group having a positive refractive power can be optimized to reduce the diameter of the lenses included in the second lens group.

[0113] In an embodiment, the optical imaging system may satisfy 0.6 < Lr / f < 0.8 (conditional expression 3). In this case, Lr is the distance along the optical axis of the optical imaging system from the reflection surface of the reflection member to the image plane. Therefore, the optical imaging system can be miniaturized.

[0114] In an embodiment, the optical imaging system may satisfy 0.6 < Lr / TTL < 0.8 (conditional expression 4). In this case, TTL is the sum of the distance along the optical axis of the optical imaging system from the object side surface of the first lens of the first lens group to the reflection surface of the reflection member and the distance along the optical axis of the optical imaging system from the reflection surface of the reflection member to the image plane. Therefore, the optical imaging system can be miniaturized.

[0115] In an embodiment, the optical imaging system may satisfy 0.3 < CA_G21 / CA_G11 < 0.6 (conditional expression 5). In this case, CA_G21 is the effective diameter of the object side surface of the first lens (e.g., the third lens or the fourth lens) of the second lens group, and CA_G11 is the effective diameter of the object side surface of the first lens of the first lens group. When the first lens of the second lens group is a non-circular lens, CA_G21 is the maximum effective diameter of the first lens of the second lens group. Therefore, the image brightness can be improved, and the optical imaging system can be miniaturized.

[0116] In an embodiment, the optical imaging system may satisfy 0.2 < BFL / TTL < 0.5 (conditional expression 6). In this case, BFL is the distance along the optical axis of the optical imaging system from the image side surface of the last lens (e.g., the fifth lens or the sixth lens) of the second lens group to the image plane. Therefore, the optical imaging system can be miniaturized.

[0117] In an embodiment, the optical imaging system may satisfy 0.4 < |fG1 / fG2| < 1 (conditional expression 7). In this case, fG2 is the focal length of the second lens group. Therefore, the optical imaging system can be miniaturized, and the resolution can be improved by appropriately distributing the refractive power of the lens groups.

[0118] In an embodiment, the optical imaging system may satisfy -1.4 < f / fG2 < -0.6 (conditional expression 8). Therefore, the focal length of the second lens group can be optimized to improve the resolution.

[0119] In an embodiment, the optical imaging system may satisfy 0.2 < RG1_S1 / fG1 < 0.6 (conditional expression 9). In this case, RG1_S1 is the radius of curvature of the object side surface of the first lens of the first lens group. Therefore, the occurrence of aberration can be minimized.

[0120] In an embodiment, the optical imaging system may satisfy 0.3 < Lf / Lr < 0.6 (conditional expression 10). In this case, Lf is the distance along the optical axis of the optical imaging system from the object side surface of the first lens of the first lens group to the reflection surface of the reflection member. Therefore, the optical imaging system can be miniaturized.

[0121] In an embodiment, the optical imaging system may satisfy 0 < DG2 / TTL < 0.2 (conditional expression 11). In this case, DG2 is the distance along the optical axis of the optical imaging system from the object side surface of the first lens (e.g., the third lens or the fourth lens) of the second lens group to the image side surface of the last lens (e.g., the fifth lens or the sixth lens) of the second lens group. Therefore, the optical imaging system can be miniaturized.

[0122] In an embodiment, the optical imaging system may satisfy 0.5 < fG1 / TTL < 0.9 (conditional expression 12). Therefore, the focal length of the first lens group can be optimized to miniaturize the optical imaging system.

[0123] In an embodiment, the optical imaging system may satisfy 2.8 < f / CA_G11 < 3.2 (conditional expression 13). Therefore, the brightness and resolution of the image can be improved.

[0124] Figure 1 is a configuration diagram of the optical imaging system according to the first embodiment of the present disclosure.

[0125] Referring to Figure 1 , the optical imaging system according to the first embodiment of the present disclosure may include a first lens group G1 and a second lens group G2. In addition, the optical imaging system may include a reflection member P disposed between the first lens group G1 and the second lens group G2.

[0126] In order from the object side of the optical imaging system, the first lens group G1 may include a first lens 110 , a second lens 120 , and a third lens 130 , and the second lens group G2 may include a fourth lens 140 , a fifth lens 150 , and a sixth lens 160 .

[0127] In addition, the optical imaging system may further include an optical filter 170 and an image sensor (not shown).

[0128] The optical imaging system according to the first embodiment of the present disclosure can focus an image on an image plane 180. The image plane 180 may be a surface on which the optical imaging system focuses an image. For example, the image plane 180 may be a surface of an image sensor on which light is incident.

[0129] In the first embodiment of the present disclosure, the reflective member P may be a prism, but may alternatively be a reflective mirror.

[0130] Characteristics (radius of curvature, thickness of a lens or distance between lenses, refractive index, Abbe number, effective radius, and focal length) of each of the first to sixth lenses 110 to 160 may be as shown in Table 1 below.

[0131] Table 1

[0132]

[0133] In the optical imaging system according to the first embodiment of the present disclosure, the first lens group G1 may have positive refractive power as a whole, and the second lens group G2 may have negative refractive power as a whole.

[0134] The first lens 110 may have positive refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0135] The second lens 120 may have negative refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0136] The third lens 130 may have positive refractive power, a convex object-side surface in a paraxial region thereof, and a convex image-side surface in a paraxial region thereof.

[0137] The fourth lens 140 may have negative refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0138] The fifth lens 150 may have negative refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0139] The sixth lens 160 may have positive refractive power, a convex object-side surface in a paraxial region thereof, and a convex image-side surface in a paraxial region thereof.

[0140] Each of the surfaces of the first to sixth lenses 110 to 160 may have an aspherical coefficient as shown in the following Table 2. For example, the object-side surface and the image-side surface of each of the first to sixth lenses 110 to 160 may be aspherical.

[0141] Table 2

[0142]

[0143]

[0144] Figure 2 is a configuration diagram of an optical imaging system according to a second embodiment of the present disclosure. Figure 2 The optical imaging system according to the second embodiment of the present disclosure may include a first lens group G1 and a second lens group G2. In addition, the optical imaging system may include a reflective member P disposed between the first lens group G1 and the second lens group G2.

[0145] In order from the object side of the optical imaging system, the first lens group G1 may include a first lens 210 , a second lens 220 , and a third lens 230 , and the second lens group G2 may include a fourth lens 240 , a fifth lens 250 , and a sixth lens 260 .

[0146] In addition, the optical imaging system may further include an optical filter 270 and an image sensor (not shown).

[0147] The optical imaging system according to the second embodiment of the present disclosure can focus the image on the image plane 280. The image plane 280 may be a surface on which the image is focused by the optical imaging system. For example, the image plane 280 may be a surface of the image sensor on which light is incident.

[0148] In the second embodiment of the present disclosure, the reflective member P may be a prism, but may alternatively be a reflective mirror.

[0149] Characteristics (radius of curvature, thickness of a lens or distance between lenses, refractive index, Abbe number, effective radius, and focal length) of each of the first to sixth lenses 210 to 260 may be as shown in Table 3 below.

[0150] Table 3

[0151]

[0152]

[0153] In the optical imaging system according to the second embodiment of the present disclosure, the first lens group G1 may have positive refractive power as a whole, and the second lens group G2 may have negative refractive power as a whole.

[0154] The first lens 210 may have positive refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0155] The second lens 220 may have negative refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0156] The third lens 230 may have positive refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0157] The fourth lens 240 may have negative refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0158] The fifth lens 250 may have negative refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0159] The sixth lens 260 may have positive refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0160] Each of the surfaces of the first to sixth lenses 210 to 260 may have an aspherical coefficient as shown in the following Table 4. For example, the object-side surface and the image-side surface of each of the first to sixth lenses 210 to 260 may be aspherical.

[0161] Table 4

[0162]

[0163]

[0164] Figure 3 is a configuration diagram of an optical imaging system according to a third embodiment of the present disclosure. Figure 3 The optical imaging system according to the third embodiment of the present disclosure may include a first lens group G1 and a second lens group G2. In addition, the optical imaging system may include a reflective member P disposed between the first lens group G1 and the second lens group G2.

[0165] In order from the object side of the optical imaging system, the first lens group G1 may include a first lens 310 , a second lens 320 , and a third lens 330 , and the second lens group G2 may include a fourth lens 340 , a fifth lens 350 , and a sixth lens 360 .

[0166] In addition, the optical imaging system may further include an optical filter 370 and an image sensor (not shown).

[0167] The optical imaging system according to the third embodiment of the present disclosure can focus the image on the image plane 380. The image plane 380 may be a surface on which the image is focused by the optical imaging system. For example, the image plane 380 may be a surface of the image sensor on which light is incident.

[0168] In the third embodiment of the present disclosure, the reflective member P may be a prism, but may alternatively be a reflective mirror.

[0169] Characteristics (curvature radius, thickness of a lens or distance between lenses, refractive index, Abbe number, effective radius, and focal length) of each of the first to sixth lenses 310 to 360 may be as shown in Table 5 below.

[0170] Table 5

[0171]

[0172]

[0173] In the optical imaging system according to the third embodiment of the present disclosure, the first lens group G1 may have positive refractive power as a whole, and the second lens group G2 may have negative refractive power as a whole.

[0174] The first lens 310 may have positive refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0175] The second lens 320 may have negative refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0176] The third lens 330 may have positive refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0177] The fourth lens 340 may have negative refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0178] The fifth lens 350 may have negative refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0179] The sixth lens 360 may have positive refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0180] Each of the surfaces of the first to sixth lenses 310 to 360 may have an aspherical coefficient as shown in the following Table 6. For example, the object-side surface and the image-side surface of each of the first to sixth lenses 310 to 360 may be aspherical.

[0181] Table 6

[0182]

[0183]

[0184] Figure 4 is a configuration diagram of an optical imaging system according to a fourth embodiment of the present disclosure. Figure 4 The optical imaging system according to the fourth embodiment of the present disclosure may include a first lens group G1 and a second lens group G2. In addition, the optical imaging system may include a reflective member P disposed between the first lens group G1 and the second lens group G2.

[0185] In order from the object side of the optical imaging system, the first lens group G1 may include a first lens 410 and a second lens 420 , and the second lens group G2 may include a third lens 430 , a fourth lens 440 , and a fifth lens 450 .

[0186] In addition, the optical imaging system may further include an optical filter 470 and an image sensor (not shown).

[0187] The optical imaging system according to the fourth embodiment of the present disclosure can focus the image on the image plane 480. The image plane 480 may be a surface on which the image is focused by the optical imaging system. For example, the image plane 480 may be a surface of the image sensor on which light is incident.

[0188] In the fourth embodiment of the present disclosure, the reflective member P may be a prism, but may alternatively be a reflecting mirror.

[0189] Characteristics (curvature radius, thickness of a lens or distance between lenses, refractive index, Abbe number, effective radius, and focal length) of each of the first to fifth lenses 410 to 450 may be as shown in Table 7 below.

[0190] Table 7

[0191]

[0192]

[0193] In the optical imaging system according to the fourth embodiment of the present disclosure, the first lens group G1 may have positive refractive power as a whole, and the second lens group G2 may have negative refractive power as a whole.

[0194] The first lens 410 may have positive refractive power, a convex object-side surface in a paraxial region thereof, and a convex image-side surface in a paraxial region thereof.

[0195] The second lens 420 may have negative refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0196] The third lens 430 may have negative refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0197] The fourth lens 440 may have negative refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0198] The fifth lens 450 may have positive refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0199] Each of the surfaces of the first to fifth lenses 410 to 450 may have an aspherical coefficient as shown in the following Table 8. For example, the object-side surface and the image-side surface of each of the first to fifth lenses 410 to 450 may be aspherical.

[0200] Table 8

[0201]

[0202]

[0203] Figure 5 is a configuration diagram of an optical imaging system according to a fifth embodiment of the present disclosure.

[0204] Reference Figure 5 The optical imaging system according to the fifth embodiment of the present disclosure may include a first lens group G1 and a second lens group G2. In addition, the optical imaging system may include a reflective member P disposed between the first lens group G1 and the second lens group G2.

[0205] In order from the object side of the optical imaging system, the first lens group G1 may include a first lens 510 and a second lens 520 , and the second lens group G2 may include a third lens 530 , a fourth lens 540 , a fifth lens 550 , and a sixth lens 560 .

[0206] In addition, the optical imaging system may further include an optical filter 570 and an image sensor (not shown).

[0207] The optical imaging system according to the fifth embodiment of the present disclosure can focus the image on the image plane 580. The image plane 580 may be a surface on which the image is focused by the optical imaging system. For example, the image plane 580 may be a surface of the image sensor on which light is incident.

[0208] In the fifth embodiment of the present disclosure, the reflective member P may be a prism, but may alternatively be a reflecting mirror.

[0209] Characteristics (radius of curvature, thickness of a lens or distance between lenses, refractive index, Abbe number, effective radius, and focal length) of each of the first to sixth lenses 510 to 560 may be as shown in Table 9 below.

[0210] Table 9

[0211]

[0212] In the optical imaging system according to the fifth embodiment of the present disclosure, the first lens group G1 may have positive refractive power as a whole, and the second lens group G2 may have negative refractive power as a whole.

[0213] The first lens 510 may have positive refractive power, a convex object-side surface in a paraxial region thereof, and a convex image-side surface in a paraxial region thereof.

[0214] The second lens 520 may have negative refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0215] The third lens 530 may have positive refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0216] The fourth lens 540 may have negative refractive power, a concave object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0217] The fifth lens 550 may have negative refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0218] The sixth lens 560 may have positive refractive power, a convex object-side surface in a paraxial region thereof, and a concave image-side surface in a paraxial region thereof.

[0219] Each of the surfaces of the first to sixth lenses 510 to 560 may have an aspherical coefficient as shown in the following Table 10. For example, the object-side surface and the image-side surface of each of the first to sixth lenses 510 to 560 may be aspherical.

[0220] Table 10

[0221]

[0222]

[0223] Table 11 below lists the values ​​of the respective parameters in conditional expressions 1 to 13.

[0224] Table 11

[0225]

[0226] Table 12 below lists the values ​​of Conditional Expressions 1 to 13. As can be seen from Table 12, all of the first to fifth embodiments of the optical imaging system according to the present disclosure satisfy all of Conditional Expressions 1 to 13.

[0227] Table 12

[0228]

[0229] The optical imaging system according to an embodiment of the present disclosure can capture high-resolution images without significantly changing aberrations due to optical image stabilization adjustment.

[0230] Although the present disclosure includes specific examples, it will be apparent after understanding the present disclosure of the present application that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The description of the features or aspects in each example should be considered to be applicable to similar features or aspects in other examples. If the described techniques are performed in a different order, and / or if the components in the described systems, architectures, devices, or circuits are combined in different ways and / or replaced or supplemented by other components or their equivalents, appropriate results can still be achieved. Therefore, the scope of the present disclosure is not limited by specific embodiments, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in the present disclosure.

Claims

1. An optical imaging system, comprising: A first lens group having a positive refractive power and including at least one lens; A second lens group including a plurality of lenses; And A reflecting member disposed between the first lens group and the second lens group and including a reflecting surface, Wherein the first lens group and the reflecting member are configured to be rotatable together about two axes perpendicular to the optical axis of the first lens group and perpendicular to each other, The optical imaging system satisfies 1.3 < f / fG1 < 1.8, where f is the total focal length of the optical imaging system, and fG1 is the focal length of the first lens group, and One or more of the at least one lens of the first lens group and the plurality of lenses of the second lens group have aspherical surfaces.

2. The optical imaging system according to claim 1 further satisfies 0.07[1 / mm]≤PG1<0.1[1 / mm], wherein: PG1 is the reciprocal of the focal length of the first lens group.

3. The optical imaging system according to claim 1 further satisfies 0.6 < Lr / f < 0.8, where Lr is the distance along the optical axis of the optical imaging system from the reflecting surface to the image plane of the optical imaging system.

4. The optical imaging system according to claim 1 further satisfies 0.3 < Lf / Lr < 0.6, where, Lf is the distance along the optical axis of the optical imaging system from the object side surface of the lens closest to the object side of the optical imaging system among the at least one lens of the first lens group to the reflecting surface, and Lr is the distance along the optical axis of the optical imaging system from the reflecting surface to the image plane of the optical imaging system.

5. The optical imaging system according to claim 1 further satisfies 0.6 < Lr / TTL < 0.8, where, Lr is the distance along the optical axis of the optical imaging system from the reflecting surface to the image plane of the optical imaging system, and TTL is the sum of the distance along the optical axis of the optical imaging system from the object side surface of the lens closest to the object side of the optical imaging system among the at least one lens of the first lens group to the reflecting surface and the distance along the optical axis of the optical imaging system from the reflecting surface to the image plane.

6. The optical imaging system according to claim 1 further satisfies 0.2 < BFL / TTL < 0.5, where, BFL is the distance along the optical axis of the optical imaging system from the image side surface of the lens closest to the image plane of the optical imaging system among the plurality of lenses of the second lens group to the image plane, and TTL is the sum of the distance along the optical axis of the optical imaging system from the object side surface of the lens closest to the object side of the optical imaging system among the at least one lens of the first lens group to the reflecting surface and the distance along the optical axis of the optical imaging system from the reflecting surface to the image plane.

7. The optical imaging system according to claim 1 further satisfies 0 < DG2 / TTL < 0.2, where, DG2 is the distance along the optical axis of the optical imaging system from the object side surface of the lens closest to the reflecting member among the plurality of lenses of the second lens group to the image side surface of the lens closest to the image plane of the optical imaging system among the plurality of lenses of the second lens group, and TTL is the sum of the distance along the optical axis of the optical imaging system from the object side surface of the lens closest to the object side of the optical imaging system among the at least one lens of the first lens group to the reflecting surface and the distance along the optical axis of the optical imaging system from the reflecting surface to the image plane.

8. The optical imaging system according to claim 1 further satisfies 0.3 < CA_G21 / CA_G11 < 0.6, where, CA_G21 is the effective diameter of the object surface of the lens among the plurality of lenses of the second lens group that is closest to the reflecting member, and CA_G11 is the effective diameter of the object surface of the lens among the at least one lens of the first lens group that is closest to the object side of the optical imaging system.

9. The optical imaging system according to claim 1 further satisfies 2.8 < f / CA_G11 < 3.2, where, CA_G11 is the effective diameter of the object surface of the lens among the at least one lens of the first lens group that is closest to the object side of the optical imaging system.

10. The optical imaging system according to claim 1, further satisfying 0.4<|fG1 / fG2|<1, wherein, fG2 is the focal length of the second lens group.

11. The optical imaging system according to claim 10, wherein: The second lens group has a negative refractive power.

12. The optical imaging system according to claim 1 further satisfies -1.4 < f / fG2 < -0.6, where, fG2 is the focal length of the second lens group.

13. The optical imaging system according to claim 1 further satisfies 0.2 < RG1_S1 / fG1 < 0.6, where, RG1_S1 is the radius of curvature of the object surface of the lens among the at least one lens of the first lens group that is closest to the object side of the optical imaging system.

14. The optical imaging system according to claim 1 further satisfies 0.5 < fG1 / TTL < 0.9, where TTL is the sum of the distance along the optical axis of the optical imaging system from the object surface of the lens among the at least one lens of the first lens group that is closest to the object side of the optical imaging system to the reflecting surface and the distance along the optical axis of the optical imaging system from the reflecting surface to the image plane of the optical imaging system.

15. The optical imaging system of claim 1, wherein: The at least one lens of the first lens group includes a first lens and a second lens, and at least one of the first lens and the second lens has a refractive index greater than 1.6, a convex object surface in its paraxial region, and a concave image surface in its paraxial region.

16. The optical imaging system according to claim 15, wherein: The first lens has a positive refractive power and a refractive index less than 1.55, and The second lens has a negative refractive power.

17. The optical imaging system of claim 1, wherein: The lens among the plurality of lenses of the second lens group that is closest to the image plane of the optical imaging system has a positive refractive power and a refractive index greater than 1.6, and at least one other lens among the plurality of lenses of the second lens group, other than the lens among the plurality of lenses of the second lens group that is closest to the image plane, has a refractive index greater than 1.

6.

18. An optical imaging system, comprising: A first lens group having a positive refractive power and including at least one lens; A second lens group including a plurality of lenses; And A reflecting member disposed between the first lens group and the second lens group and including a reflecting surface, wherein the first lens group and the reflecting member are configured to be rotatable together about two axes perpendicular to the optical axis of the first lens group and perpendicular to each other, The optical imaging system satisfies 0.2 < BFL / TTL < 0.5, where BFL is the distance along the optical axis of the optical imaging system from the image surface of the lens among the plurality of lenses of the second lens group that is closest to the image plane of the optical imaging system to the image plane, and TTL is the sum of the distance along the optical axis of the optical imaging system from the object surface of the lens among the at least one lens of the first lens group that is closest to the object side of the optical imaging system to the reflecting surface and the distance along the optical axis of the optical imaging system from the reflecting surface to the image plane, and One or more lenses among the at least one lens of the first lens group and the multiple lenses of the second lens group have aspherical surfaces.

19. The optical imaging system according to claim 18, further satisfying 0.4<|fG1 / fG2|<1, wherein, fG1 is the focal length of the first lens group, and fG2 is the focal length of the second lens group.

20. The optical imaging system according to claim 18 further satisfies 0.3 < Lf / Lr < 0.6, where, Lf is the distance along the optical axis of the optical imaging system from the object surface of the lens closest to the object side of the optical imaging system among the at least one lens of the first lens group to the reflective surface, and Lr is the distance along the optical axis of the optical imaging system from the reflective surface to the image plane.

21. The optical imaging system according to claim 18 further satisfies 0.5 < fG1 / TTL < 0.9, where, fG1 is the focal length of the first lens group.

22. Optical imaging system, comprising: A first lens group having a positive refractive power and including at least one lens; A second lens group including multiple lenses; And A reflective member disposed between the first lens group and the second lens group and including a reflective surface, wherein the first lens group and the reflective member are configured to be rotatable together about two axes perpendicular to the optical axis of the first lens group and perpendicular to each other, The optical imaging system satisfies 0.3 < CA_G21 / CA_G11 < 0.6, where CA_G21 is the effective diameter of the object surface of the lens closest to the reflective member among the multiple lenses of the second lens group, and CA_G11 is the effective diameter of the object surface of the lens closest to the object side of the optical imaging system among the at least one lens of the first lens group, and One or more lenses among the at least one lens of the first lens group and the multiple lenses of the second lens group have aspherical surfaces.

23. The optical imaging system according to claim 22, further satisfying 0.07[1 / mm]≤PG1<0.1[1 / mm], wherein: PG1 is the reciprocal of the focal length of the first lens group.

24. The optical imaging system according to claim 22 further satisfies 0.2 < RG1_S1 / fG1 < 0.6, where RG1_S1 is the radius of curvature of the object surface of the lens closest to the object side of the optical imaging system among the at least one lens of the first lens group, and fG1 is the focal length of the first lens group.

25. The optical imaging system according to claim 22 further satisfies 2.8 < f / CA_G11 < 3.2, where, f is the total focal length of the optical imaging system.

Images