Optical image capturing system

Abstract

An optical imaging system is provided. The optical imaging system includes a first lens group including a first lens, a reflective member, and a second lens arranged in order from an object side to an imaging side, and a second lens group disposed behind the second lens and including a plurality of lenses, in which the first lens has a positive refractive power, and the second lens has a negative refractive power. And a reflective member having a convex object-side surface and a concave image-side surface, and a first lens spaced apart from the reflective member and a second lens coupled to the reflective member.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2023-0106386 filed on August 14, 2023, in the Korean Intellectual Property Office, and Korean Patent Application No. 10-2024-0004563 filed on January 11, 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 following description relates to an optical imaging system. Background Art

[0004] The portable terminal may be equipped with a camera including an optical imaging system including multiple lenses to enable video calling and image capturing.

[0005] In addition, as various operations of a camera provided in a portable terminal gradually increase, a demand for a camera with high resolution for the portable terminal increases.

[0006] In addition, as the form factor of portable terminals has been reduced, it is desired that cameras for portable terminals have a slimmer form factor. Therefore, it is desired to develop an optical imaging system that is slim but can achieve high resolution.

[0007] The above information is presented as background information only to assist with understanding the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above may be applicable as prior art with respect to the present disclosure. Utility Model Content

[0008] The purpose of providing this utility model summary is to introduce a selection of concepts in a concise form, and these concepts will be further described in the following detailed description. This utility model summary is not intended to identify the key features or essential features of the claimed subject matter, nor is it intended to be used to help determine the scope of the claimed subject matter.

[0009] In general, an optical imaging system includes: a first lens group including a first lens, a reflecting member, and a second lens arranged in sequence from an object side to an imaging side; and a second lens group disposed behind the second lens and including a plurality of lenses, wherein the first lens has positive refractive power and has a convex object side surface and a concave image side surface, and wherein the first lens is spaced apart from the reflecting member and the second lens is bonded to the reflecting member.

[0010] The reflective member may be configured to rotate based on two axes that are perpendicular to each other.

[0011] One of the two axes can be one of the optical axis of the first lens and an axis parallel to the optical axis of the first lens.

[0012] The reflecting member may include an incident surface, a reflecting surface, and an exit surface, wherein the effective diameter of the object side surface of the first lens may be greater than the minor axis length of the incident surface of the reflecting member.

[0013] The reflecting member may include an incident surface, a reflecting surface, and an exit surface, wherein 0.9 < D11P / DP22 < 1.5, where D11P is the distance from the object side surface of the first lens to the reflecting surface of the reflecting member, and DP22 is the distance from the reflecting surface of the reflecting member to the image side surface of the second lens.

[0014] 0.5 < |RG1_S1 / RG1_S2| < 1.2, 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.

[0015] 1.7 < n_p < 2.0, where n_p is the refractive index of the reflecting member.

[0016] -0.7 < fG1 / fG2 < 0, where fG1 is the total focal length of the first lens group, and fG2 is the total focal length of the second lens group.

[0017] 0.4 < f / f1 < 0.75, where f is the total focal length of the optical imaging system, and f1 is the focal length of the first lens.

[0018] 0.1 < f / f2 < 1.1, where f is the total focal length of the optical imaging system, and f2 is the focal length of the second lens.

[0019] -0.35 < (RG1_S1 - RG1_S2) / (RG1_S1 + RG1_S2) < 0, 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.

[0020] The reflecting member may include an incident surface, a reflecting surface, and an exit surface, and 1 < D11P / DR < 1.3, where D11P is the distance from the object side surface of the first lens to the reflecting surface of the reflecting member, and DR is the distance from the incident surface of the reflecting member to the reflecting surface of the reflecting member.

[0021] The reflecting member may include an incident surface, a reflecting surface, and an exit surface, and satisfy 0.4 < D12P / DR < 0.6, where D12P is the distance from the image side surface of the first lens to the incident surface of the reflecting member, and DR is the distance from the incident surface of the reflecting member to the reflecting surface of the reflecting member.

[0022] The second lens may have a positive refractive power and have a convex image side surface.

[0023] At least three lenses of the plurality of lenses of the second lens group may have a refractive index greater than 1.6.

[0024] Generally, the optical imaging system includes a reflecting member; a first lens, having a positive refractive power, and disposed in front of the incident surface of the reflecting member; and a second lens, coupled to the exit surface of the reflecting member, and configured to rotate together with the reflecting member, wherein the first lens is spaced apart from the reflecting member.

[0025] The optical imaging system may include a total of seven lenses.

[0026] The first lens may have a convex object side surface and a concave image side surface.

[0027] The second lens may have a flat object side surface.

[0028] Other features and aspects will become apparent from the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 An exemplary optical imaging system according to a first exemplary embodiment is shown.

[0030] Figure 2 Shown is Figure 1 the aberration characteristics of the exemplary optical imaging system shown.

[0031] Figure 3 An exemplary optical imaging system according to a second exemplary embodiment is shown.

[0032] Figure 4 Shown is Figure 3 the aberration characteristics of the exemplary optical imaging system shown.

[0033] Figure 5 An exemplary optical imaging system according to a third exemplary embodiment is shown.

[0034] Figure 6 Shown is Figure 5 the aberration characteristics of the exemplary optical imaging system shown.

[0035] Figure 7An exemplary optical imaging system according to a fourth exemplary embodiment is shown.

[0036] Figure 8 Shows Figure 7 Aberration characteristics of an exemplary optical imaging system are shown.

[0037] Fig. 9 An exemplary optical imaging system according to a fifth exemplary embodiment is shown.

[0038] Fig.10 Shows Fig. 9 Aberration characteristics of an exemplary optical imaging system are shown.

[0039] Throughout the drawings and detailed description, unless otherwise described, the same reference numerals refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative sizes, proportions, and descriptions of elements in the drawings may be exaggerated. DETAILED DESCRIPTION

[0040] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the method, device and / or system described herein. However, various changes, modifications and equivalents of the method, device and / or system described herein will be apparent after understanding the disclosure of the application. For example, the order in the operation described herein and / or the order of the operation described herein are merely examples, and except for the order and / or the order of operations in the operation that must occur in a specific sequence, it is not limited to the order set forth herein, but can be changed, which will be apparent after understanding the disclosure of the application. As another example, except for the order and / or the order of operations in the operation that must occur in a sequence (e.g., a specific sequence), the order of operations and / or the order in the operation can be performed in parallel. In addition, for greater clarity and brevity, the description of features known after understanding the disclosure of the application can be omitted.

[0041] Although terms such as "first", "second" and "third" or A, B, (a), (b) may be used herein to describe various members, components, regions, layers or portions, these members, components, regions, layers or portions are not limited by these terms. Each of these terms is not used to define, for example, the importance, sequence or order of the corresponding member, component, region, layer or portion, but is only used to distinguish the corresponding member, component, region, layer or portion from other members, components, regions, layers or portions. Therefore, without departing from the teachings of the examples described herein, the first member, first component, first region, first layer or first portion mentioned in these examples may also be referred to as the second member, second component, second region, second layer or second portion.

[0042] Throughout the specification, when a component, element or layer is described as being "on another component, element or layer," "connected to," "coupled to," or "engaged to" another component, element or layer, it may be directly "on another component, element or layer," directly "connected to," "coupled to," or "engaged to" another component, element or layer (e.g., in contact with another component, element or layer), or there may reasonably be one or more other components, elements, layers between the component, element or layer and the other component, element or layer. When a component, element or layer is described as being "directly on another component, element or layer," "directly connected to," "directly coupled to," or "directly engaged to" another component, element or layer, there are no other components, elements, or layers between the component, element or layer and the other component, element or layer. Similarly, expressions such as "between" and "directly between," as well as "adjacent" and "directly adjacent" may also be interpreted as described above.

[0043] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the words "one", "an" and "the" are intended to include plural forms as well. As non-limiting examples, the words "comprise", "include" and "have" illustrate the existence of the described features, quantities, operations, components, elements and / or their combinations, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations, or the replacement existence of the replaceable features, quantities, operations, components, elements and / or their combinations. In addition, although an embodiment can set forth the words "comprise", "include" and "have" to illustrate the existence of the described features, quantities, operations, components, elements and / or their combinations, other embodiments may exist, in which one or more of the described features, quantities, operations, components, elements and / or their combinations are not present.

[0044] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items. The phrases "at least one of A, B, and C," etc. are intended to have separate meanings, and these phrases "at least one of A, B, and C," etc. also include examples in which one or more of A, B, and C may be present (e.g., any combination of one or more of A, B, and C), unless the corresponding description and implementation require that the list (e.g., "at least one of A, B, and C") be interpreted as having a combined meaning.

[0045] The features described herein may be embodied in different forms and should not be construed as being limited to the examples described herein. On the contrary, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application. In this article, the use of the wording "may" relative to an example or implementation (e.g., content that may be included or implemented with respect to an example or implementation) means that there is at least one example or implementation that includes or implements such a feature, and all examples or implementations are not limited thereto. The words "example" or "implementation" used herein have the same meaning (e.g., the phrase "in one example" has the same meaning as "in one implementation", and "in one or more examples" has the same meaning as "in one or more implementations").

[0046] One or more examples may provide an optical imaging system that achieves high resolution despite its small size.

[0047] One or more examples may reduce the size of an optical imaging system and capture high-resolution images.

[0048] In the attached lens structure views, the thickness, size and shape of the lenses are slightly exaggerated for illustrative purposes, and in particular, the spherical or aspherical shapes presented in the lens structure views are presented only as examples and are not limited to the shapes.

[0049] The optical imaging system according to one or more embodiments may be installed in a portable terminal. In an example, the optical imaging system may be a configuration of a camera module installed on a portable terminal. In a non-limiting example, by way of example only, the portable terminal may be a portable terminal such as a mobile communication terminal, a smart phone, or a tablet personal computer (PC).

[0050] In one or more examples, the object-side surface of the lens refers to the surface close to (or facing) the object side, and the image-side surface refers to the surface close to (or facing) the image side. In addition, in one or more examples, the values ​​of the radius of curvature, thickness, distance, and focal length of the lens are all in mm, and the unit of the field of view (FOV) is degree.

[0051] In addition, in the description of the shape of each lens, the disclosure that a surface is convex means that the paraxial region of the corresponding surface is convex, and the disclosure that a surface is concave means that the paraxial region of the corresponding surface is concave.

[0052] The paraxial region refers to a very narrow region of the lens close to the optical axis.

[0053] The imaging plane may refer to a virtual surface on which a focus is formed by an optical imaging system. Alternatively, the imaging plane may refer to one surface of an image sensor on which light is received.

[0054] An optical imaging system according to one or more embodiments includes a plurality of lens groups. As an example, the optical imaging system may include a first lens group and a second lens group.

[0055] Each of the first lens group and the second lens group includes a plurality of lenses. For example, each of the first lens group and the second lens group may include two or more lenses.

[0056] In an exemplary 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 arranged in sequence from the object side to the imaging side. In this example, the first lens group may include the first lens and the second lens, and the second lens group may include the third lens to the seventh lens.

[0057] The optical imaging system according to one or more embodiments may further include a reflective member having a reflective surface that changes the optical path. In an exemplary embodiment, the reflective surface of the reflective member may be configured to change the optical path by 90°. The reflective member may be a reflector or a prism.

[0058] In exemplary embodiments, the reflective member may be disposed between the first lens and the second lens.

[0059] When the reflective member is a prism, the reflective member may have a shape that bisects a rectangular parallelepiped or a cube in a diagonal direction. The prism includes an incident surface, a reflective surface, and an exit surface, light is incident through the incident surface, light passing through the incident surface is reflected by the reflective surface, and light reflected from the reflective surface is emitted through the exit surface.

[0060] The light passing through the first lens may pass through the incident surface of the reflective member, and its optical path may be changed by 90° on the reflective surface, and the light may pass through the exit surface of the reflective member and enter the second lens.

[0061] Since the reflective member may be disposed between the first lens and the second lens, the optical axis of the first lens and the optical axes of the second to seventh lenses may be perpendicular to each other.

[0062] In an example, an optical axis direction of the first lens may be substantially parallel to a thickness direction of the portable terminal, and optical axis directions of the second to seventh lenses may be substantially parallel to a longitudinal direction or a width direction of the portable terminal.

[0063] The reflective member includes three square surfaces and two triangular surfaces. For example, each of the incident surface, the reflecting surface and the exiting surface of the reflective member is square, and both side surfaces of the reflective member are approximately triangular.

[0064] By bending the optical path via the reflective member, a long optical path can be formed in a relatively narrow space.

[0065] Therefore, the optical imaging system can be miniaturized and can have a long focal length.

[0066] An optical imaging system according to one or more embodiments has characteristics of a telephoto lens having a relatively narrow field of view (FOV) and a long focal length.

[0067] In addition, the optical imaging system may further include an image sensor that converts an image of an incident object into an electrical signal.

[0068] In addition, the optical imaging system may further include an infrared blocking filter (hereinafter referred to as a filter) to block infrared rays. The filter may be disposed between the seventh lens and the image sensor.

[0069] In an exemplary embodiment, the first lens group may include a first lens, a reflective member, and a second lens, and the second lens group may include a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. However, this is merely an example, and the first lens group and the second lens group may include a varying lens arrangement.

[0070] In example embodiments, the plurality of lenses may be spaced apart from each other in the optical axis direction.

[0071] In an exemplary embodiment, some lenses among the plurality of lenses may be configured as bonded lenses. In an example, the object-side surface of the second lens may be bonded to the exit surface of the reflective member.

[0072] The effective radius of the first lens may be greater than the effective radius of the other lenses. That is, in the example, among the first to seventh lenses, the effective radius of the first lens may be the largest.

[0073] In an example, the first lens may have a shape different from that of the other lenses. For example, when viewed from the optical axis direction of the first lens, the first lens may have a substantially circular shape. In addition, the second to seventh lenses may have non-circular shapes. In a non-limiting example, the first lens may have a circular planar shape, and the second to seventh lenses may have a non-circular planar shape.

[0074] In a plane perpendicular to the optical axis, for a non-circular lens, the length in a first axis direction perpendicular to the optical axis may be longer than the length in a second axis direction perpendicular to both the optical axis and the first axis direction. For a non-circular lens, the ratio of the length in the second axis direction to the length in the first axis direction may be greater than 0.5 and less than 1.

[0075] In an example, the non-circular lens has a shape in which a part of a circle is cut off when viewed from the optical axis direction.

[0076] In an example, the first axis direction is a direction in which a long side of the image sensor extends, and the second axis direction is a direction in which a short side of the image sensor extends.

[0077] For the non-circular lens, the length in the first axis direction may be longer than the length in the second axis direction, and thus, the non-circular lens may have a major axis effective radius and a minor axis effective radius.

[0078] The first lens group has positive refractive power as a whole, and includes at least one lens having a meniscus shape convex toward the object side.

[0079] In an exemplary embodiment, the first lens group includes two lenses (e.g., a first lens and a second lens). The first lens is disposed closer to the object side in front of the reflection member (e.g., in front of the incident surface of the reflection member), and the second lens is disposed closer to the image side behind the reflection member (e.g., behind the exit surface of the reflection member).

[0080] The first lens may have positive refractive power and may have a meniscus shape convex toward the object side. 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.

[0081] An effective diameter of the object-side surface of the first lens may be greater than a minor axis length of the incident surface of the reflective member.

[0082] The first lens may be formed of plastic, and each of an object-side surface and an image-side surface of the first lens may be aspherical.

[0083] The second lens may have positive refractive power and may have a convex image-side surface. The second lens may be formed of glass.

[0084] The second lens group includes a plurality of lenses and has negative refractive power as a whole.

[0085] Among the plurality of lenses in the second lens group, at least three lenses have a refractive index greater than 1.6.

[0086] Among the plurality of lenses in the second lens group, a lens disposed closest to the reflecting member has positive refractive power.

[0087] In an exemplary embodiment, the second lens group includes a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The third lens has positive refractive power, the fourth lens has negative refractive power, the fifth lens has positive refractive power, the sixth lens has positive refractive power, and the seventh lens may have positive refractive power or negative refractive power.

[0088] The third to seventh lenses may be configured to have a refractive index and an Abbe number different from those of adjacent lenses.

[0089] In an example, a reflective member is disposed in front of the second lens group. The reflective member may rotate based on two axes perpendicular to each other to compensate for shake during an image capturing operation.

[0090] That is, when shaking occurs during capturing an image or shooting a video due to factors such as hand trembling of a user, the shaking may be compensated by rotating the reflection member in response to the shaking.

[0091] In an exemplary embodiment, the reflective member can be rotated using the optical axis of the first lens (or an axis parallel to the optical axis) as a rotation axis. In addition, the reflective member can be rotated using the long axis of the reflective surface of the reflective member (or an axis parallel to the long axis) as a rotation axis. The long axis of the reflective surface of the reflective member can intersect with the optical axis of the first lens. In addition, the long axis of the reflective surface of the reflective member can intersect with the optical axis of the second lens group. For example, the reflective member can be rotated using an axis perpendicular to both the optical axis of the first lens and the optical axis of the second lens group (or an axis parallel to the axis) as a rotation axis.

[0092] Since the reflective member may have a relatively lighter weight than that of the optical imaging system, the shake may be easily compensated with a smaller driving force.

[0093] Since the first lens having a 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 formed to be small. Therefore, the height of the optical imaging system can be reduced while reducing the Fno (F number) of the optical imaging system.

[0094] In addition, in the example, the first lens can rotate together with the reflective member. In this example, when the reflective member is rotated using the optical axis of the first lens (or an axis parallel to the optical axis) as the rotation axis, an error may occur in the optical path passing through the first lens, resulting in a reduction in resolution. However, in an exemplary embodiment, the error in the optical path that occurs during shake correction can be compensated by providing a second lens having a positive refractive power behind the reflective member. In the example, the second lens can rotate together with the reflective member.

[0095] In an exemplary embodiment, for some of the lenses included in the first lens group, the object side surface and the image side surface may be spherical.

[0096] In an exemplary embodiment, for one or more of the plurality of lenses included in the second lens group, the object side surface and the image side surface may be aspherical.

[0097] In an exemplary embodiment, some of the first lens to the seventh lens may be formed of a material different from that of the other lenses. For example, the second lens may be formed of glass, and the remaining lenses except the second lens may be formed of plastic.

[0098] The aspherical surface of the lens is represented by Equation 1 below.

[0099] Equation 1:

[0100]

[0101] In Equation 1, c represents the curvature of the lens surface (the reciprocal of the radius of curvature), K represents the conic constant, and Y represents the distance from an arbitrary point on the aspherical surface of the lens to the optical axis. In addition, the constants A to H and J refer to the aspherical coefficients. Further, Z (SAG) represents the distance from an arbitrary point on the aspherical surface of the lens to the vertex of the aspherical surface in the optical axis direction.

[0102] The optical imaging system according to one or more embodiments may satisfy at least one of the following conditional expressions.

[0103] In an exemplary embodiment, the optical imaging system may satisfy the conditional expression 0.9 < D11P / DP22 < 1.5. In the example, D11P is the distance from the object side surface of the first lens to the reflection surface of the reflection member, and DP22 is the distance from the reflection surface of the reflection member to the image side surface of the second lens. Accordingly, the optical imaging system can be miniaturized.

[0104] In an exemplary embodiment, the optical imaging system may satisfy the conditional expression 0.5 < |RG1_S1 / RG1_S2| < 1.2. In the example, RG1_S1 is the radius of curvature of the object side surface of the main lens (e.g., the first lens) of the first lens group, and RG1_S2 is the radius of curvature of the image side surface of the main lens (e.g., the first lens) of the first lens group. Accordingly, during shake correction, the error in the optical path passing through the first lens can be minimized, and a reduction in resolution due to shake correction can be prevented.

[0105] In an exemplary embodiment, the optical imaging system may satisfy the conditional expression 1.7 < n_p < 2.0. In the example, n_p is the refractive index of the reflective member. Thus, light in the reflective member may be totally reflected. Additionally, the driving load may be reduced during shake compensation.

[0106] In an exemplary embodiment, the optical imaging system may satisfy the conditional expression 0.4 < f / f1 < 0.75. In the example, f is the total focal length of the optical imaging system, and f1 is the focal length of the first lens. Thus, the image brightness may be ensured by appropriately adjusting the refractive power of the first lens.

[0107] In an exemplary embodiment, the optical imaging system may satisfy the conditional expression 0.1 < f / f2 < 1.1. In the example, f2 is the focal length of the second lens. Thus, a reduction in resolution due to shake correction may be prevented by appropriately adjusting the refractive power of the second lens.

[0108] In an exemplary embodiment, the optical imaging system may satisfy the conditional expression -0.7 < fG1 / fG2 < 0. In the example, fG1 is the focal length of the first lens group, and fG2 is the focal length of the second lens group. Thus, by appropriately distributing the refractive power of each lens group, the optical imaging system may be miniaturized and the resolution may be improved.

[0109] In an exemplary embodiment, the optical imaging system may satisfy the conditional expression -0.35 < (RG1_S1 - RG1_S2) / (RG1_S1 + RG1_S2) < 0. Thus, the spherical aberration occurring in the first lens may be minimized. Additionally, by appropriately adjusting the focal length of the first lens, the occurrence of aberration may be minimized while maintaining sufficient telephoto performance.

[0110] In an exemplary embodiment, the optical imaging system may satisfy the conditional expression 1 < D11P / DR < 1.3. In the example, DR is the distance from the incident surface of the reflective member to the reflective surface of the reflective member (or the distance from the reflective surface to the exit surface). Thus, the optical imaging system may be prevented from becoming significantly thicker in the optical axis direction of the first lens.

[0111] In an exemplary embodiment, the optical imaging system may satisfy the conditional expression 0.4 < D12P / DR < 0.6. In the example, D12P is the distance from the image side surface of the first lens to the incident surface of the reflective member. Thus, interference between the first lens and the reflective member may be prevented, and the optical imaging system may be miniaturized.

[0112] In an exemplary embodiment, the optical imaging system may satisfy the conditional expression -0.8 < f / fG2 < 0. Thus, by appropriately distributing the refractive power of each lens group, the optical imaging system can be miniaturized and the resolution can be improved.

[0113] In an exemplary embodiment, the optical imaging system may satisfy the conditional expression 1.5 < DP22 / DR < 2.5. Thus, the driving load during shake correction can be minimized, and the optical imaging system can be miniaturized.

[0114] In an exemplary embodiment, the optical imaging system may satisfy the conditional expression -0.3 < RG2_S1 / fG2 < 0. In the example, RG2_S1 is the radius of curvature of the object side surface of the main lens of the second lens group (e.g., the third lens). Thus, by optimizing the refractive power of the second lens group, spherical aberration can be reduced and the resolution can be improved.

[0115] In an exemplary embodiment, the optical imaging system may satisfy the conditional expression 0.4 < fG1 / L < 0.8. In the example, L is the sum of the distance from the object side surface of the first lens to the reflection surface of the reflection member and the distance from the reflection surface of the reflection member to the imaging surface. Thus, the optical imaging system can be miniaturized and the occurrence of aberration can be minimized.

[0116] In an exemplary embodiment, the optical imaging system may satisfy the conditional expression 0.1 < Lf / Lr < 0.3. In the example, Lf is the distance from the object side surface of the first lens to the reflection surface of the reflection member, and Lr is the distance from the reflection surface of the reflection member to the imaging surface. Thus, the optical imaging system can be miniaturized.

[0117] In an exemplary embodiment, the optical imaging system may satisfy the conditional expression 0 < D12P / L < 0.07. Thus, the optical imaging system can be miniaturized by appropriately adjusting the distance between the first lens and the reflection member.

[0118] In an exemplary embodiment, the optical imaging system may satisfy the conditional expression 0 < D23 / L < 0.15. In the example, D23 is the distance from the image side surface of the last lens of the first lens group (e.g., the second lens) to the object side surface of the main lens of the second lens group (e.g., the third lens). Thus, the optical imaging system can be miniaturized by appropriately adjusting the distance between the reflection member and the second lens group.

[0119] In an exemplary embodiment, the optical imaging system may satisfy the conditional expression 0.3 < D3 / L < 0.6. In the example, D3 is the distance from the object side surface of the main lens of the second lens group (e.g., the third lens) to the image side surface of the last lens of the second lens group (e.g., the seventh lens). Therefore, the aberration can be minimized and the optical imaging system can be miniaturized.

[0120] In an exemplary embodiment, the optical imaging system may satisfy the conditional expression 2.5 < Fno×(fG1 / f) < 5. In the example, Fno is the F-number of the optical imaging system. Therefore, the image brightness and resolution can be improved.

[0121] Figure 1 An exemplary optical imaging system according to a first exemplary embodiment is shown, and Figure 2 is shown Figure 1 the aberration characteristics of the exemplary optical imaging system shown.

[0122] Reference will be made to Figure 1 and Figure 2 describe the optical imaging system according to the first exemplary embodiment.

[0123] The optical imaging system 100 according to the first embodiment includes a first lens group and a second lens group. In addition, the optical imaging system further includes a reflection member P disposed in front of (or on the object side of) the second lens group.

[0124] In the order from the object side to the imaging side, the first lens group includes a first lens 110 and a second lens 120, and the second lens group includes a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, and a seventh lens 170.

[0125] The first lens group may further include a reflection member P disposed between (or adjacent to) the first lens 110 and the second lens 120.

[0126] In a non-limiting example, the first lens 110 and the third lens 130 to the seventh lens 170 may be formed of plastic, and the second lens 120 may be formed of glass.

[0127] In addition, the optical imaging system may further include a filter 180 and an image sensor.

[0128] 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 the 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 on which light is received.

[0129] In the first embodiment, the reflective member P may be a prism. However, this is merely an example, and the reflective member P may also be provided as a reflective mirror.

[0130] The characteristics of each lens (radius of curvature, thickness of the lens or distance between lenses, refractive index, and Abbe number) are shown in Table 1 below.

[0131] In the example, due to the coordinate system code convention of the optical design program, the sign of the radius of curvature, thickness or distance is opposite to that of the reflective surface of the prism, but for convenience, the sign is not changed in the following table.

[0132] Table 1

[0133]

[0134] In the example, the total focal length f of the optical imaging system according to the first embodiment is 18.61 mm, Fno is 3.4, and IMG HT is 3.575 mm.

[0135] In the first embodiment, the first lens group has positive refractive power as a whole, and the second lens group has negative refractive power as a whole.

[0136] An effective radius of the object-side surface of the first lens 110 of the first lens group is greater than an effective radius of the image-side surface of the first lens 110 of the first lens group.

[0137] The focal length fG1 of the first lens group is 16.387 mm, and the focal length fG2 of the second lens group is -45.602 mm.

[0138] The major axis length of the incident surface of the reflecting member P was 7.2 mm, and the minor axis length of the incident surface of the reflecting member P was 4.2 mm.

[0139] The first lens 110 has positive refractive power, the object-side surface of the first lens 110 is convex, and the image-side surface of the first lens 110 is concave.

[0140] The second lens 120 has positive refractive power, the object-side surface of the second lens 120 is flat, and the image-side surface of the second lens 120 is convex.

[0141] The third lens 130 has positive refractive power, an object-side surface of the third lens 130 is convex, and an image-side surface of the third lens 130 is concave.

[0142] The fourth lens 140 has negative refractive power, an object-side surface of the fourth lens 140 is convex, and an image-side surface of the fourth lens 140 is concave.

[0143] The fifth lens 150 has positive refractive power, the object-side surface of the fifth lens 150 is concave, and the image-side surface of the fifth lens 150 is convex.

[0144] The sixth lens 160 has positive refractive power, the object-side surface of the sixth lens 160 is concave, and the image-side surface of the sixth lens 160 is convex.

[0145] The seventh lens 170 has negative refractive power, and the object-side surface and the image-side surface of the seventh lens 170 are concave.

[0146] In addition, the second lens 120 may be coupled to the reflective member P. In an example, an exit surface of the reflective member P and an object-side surface of the second lens 120 may be coupled to each other.

[0147] In an example, each surface of the first lens 110 and the third lens 130 to the seventh lens 170 has an aspherical coefficient shown in Table 2. For example, the object-side surface and the image-side surface of each of the first lens 110 and the third lens 130 to the seventh lens 170 are aspherical surfaces.

[0148] Table 2

[0149]

[0150]

[0151] Figure 3 An exemplary optical imaging system according to a second exemplary embodiment is shown, and Figure 4 Shows Figure 3 Aberration characteristics of an exemplary optical imaging system are shown.

[0152] Reference Figure 3 and Figure 4 An optical imaging system according to a second exemplary embodiment is described.

[0153] The optical imaging system 200 according to the second embodiment includes a first lens group and a second lens group. In addition, the optical imaging system further includes a reflective member P disposed in front of the second lens group.

[0154] In order from the object side to the imaging side, the first lens group includes a first lens 210 and a second lens 220 , and the second lens group includes a third lens 230 , a fourth lens 240 , a fifth lens 250 , a sixth lens 260 , and a seventh lens 270 .

[0155] The first lens group may further include a reflective member P disposed between the first lens 210 and the second lens 220 (or adjacent to the first lens 210 and the second lens 220 ).

[0156] In an example, the first lens 210 and the third to seventh lenses 230 to 270 may be formed of plastic, and the second lens 220 may be formed of glass.

[0157] In addition, the optical imaging system may further include an optical filter 280 and an image sensor.

[0158] 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 on which light is received.

[0159] In the second embodiment, the reflective member P may be a prism. However, this is merely an example, and the reflective member P may also be provided as a reflective mirror.

[0160] The characteristics of each lens (radius of curvature, thickness of the lens or distance between lenses, refractive index, and Abbe number) are shown in Table 3 below.

[0161] Table 3

[0162]

[0163] In the example, the total focal length f of the optical imaging system according to the second embodiment is 19 mm, Fno is 3.3, and IMG HT is 3.575 mm.

[0164] In the second embodiment, the first lens group has positive refractive power as a whole, and the second lens group has negative refractive power as a whole.

[0165] The effective radius of the object-side surface of the first lens 210 of the first lens group is greater than the effective radius of the image-side surface of the first lens 210 of the first lens group.

[0166] The focal length fG1 of the first lens group is 16.931 mm, and the focal length fG2 of the second lens group is -50.617 mm.

[0167] The major axis length of the incident surface of the reflecting member P was 7.5 mm, and the minor axis length of the incident surface of the reflecting member P was 4.3 mm.

[0168] The first lens 210 has positive refractive power, the object-side surface of the first lens 210 is convex, and the image-side surface of the first lens 210 is concave.

[0169] The second lens 220 has positive refractive power, the object-side surface of the second lens 220 is flat, and the image-side surface of the second lens 220 is convex.

[0170] The third lens 230 has positive refractive power, the object-side surface of the third lens 230 is convex, and the image-side surface of the third lens 230 is concave.

[0171] The fourth lens 240 has negative refractive power, an object-side surface of the fourth lens 240 is convex, and an image-side surface of the fourth lens 240 is concave.

[0172] The fifth lens 250 has positive refractive power, the object-side surface of the fifth lens 250 is concave, and the image-side surface of the fifth lens 250 is convex.

[0173] The sixth lens 260 has positive refractive power, the object-side surface of the sixth lens 260 is concave, and the image-side surface of the sixth lens 260 is convex.

[0174] The seventh lens 270 has negative refractive power, and the object-side surface and the image-side surface of the seventh lens 270 are concave.

[0175] In addition, the second lens 220 may be coupled to the reflective member P. For example, an exit surface of the reflective member P and an object-side surface of the second lens 220 may be coupled to each other.

[0176] In an example, each surface of the first lens 210 and the third lens 230 to the seventh lens 270 has an aspherical coefficient shown in Table 4. For example, the object side surface and the image side surface of each of the first lens 210 and the third lens 230 to the seventh lens 270 are aspherical surfaces.

[0177] Table 4

[0178]

[0179]

[0180] Figure 5 An exemplary optical imaging system according to a third exemplary embodiment is shown, and Figure 6 Shows Figure 5 Aberration characteristics of an exemplary optical imaging system are shown.

[0181] Reference Figure 5 and Figure 6 An optical imaging system according to a third exemplary embodiment is described.

[0182] The optical imaging system 300 according to the third embodiment includes a first lens group and a second lens group. In addition, the optical imaging system further includes a reflective member P disposed in front of the second lens group.

[0183] In order from the object side to the imaging side, the first lens group includes a first lens 310 and a second lens 320 , and the second lens group includes a third lens 330 , a fourth lens 340 , a fifth lens 350 , a sixth lens 360 , and a seventh lens 370 .

[0184] The first lens group may further include a reflective member P disposed between the first lens 310 and the second lens 320 (or adjacent to the first lens 310 and the second lens 320 ).

[0185] The first lens 310 and the third to seventh lenses 330 to 370 may be formed of plastic, and the second lens 320 may be formed of glass.

[0186] In addition, the optical imaging system may further include an optical filter 380 and an image sensor.

[0187] 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 on which light is received.

[0188] In the third embodiment, the reflective member P may be a prism. However, this is merely an example, and the reflective member P may also be provided as a reflective mirror.

[0189] The characteristics of each lens (radius of curvature, thickness of the lens or distance between lenses, refractive index, and Abbe number) are shown in Table 5 below.

[0190] Table 5

[0191]

[0192] In the example, the total focal length f of the optical imaging system according to the third embodiment is 19.9815 mm, Fno is 3.5, and IMG HT is 3.575 mm.

[0193] In the third embodiment, the first lens group has positive refractive power as a whole, and the second lens group has negative refractive power as a whole.

[0194] The effective radius of the object-side surface of the first lens 310 of the first lens group is greater than the effective radius of the image-side surface of the first lens 310 of the first lens group.

[0195] The focal length fG1 of the first lens group is 14.311 mm, and the focal length fG2 of the second lens group is -104.724 mm.

[0196] The major axis length of the incident surface of the reflecting member P was 7.0 mm, and the minor axis length of the incident surface of the reflecting member P was 4.2 mm.

[0197] The first lens 310 has positive refractive power, the object-side surface of the first lens 310 is convex, and the image-side surface of the first lens 310 is concave.

[0198] The second lens 320 has positive refractive power, the object-side surface of the second lens 320 is flat, and the image-side surface of the second lens 320 is convex.

[0199] The third lens 330 has positive refractive power, and the object-side surface and the image-side surface of the third lens 330 are convex.

[0200] The fourth lens 340 has negative refractive power, and the object-side surface and the image-side surface of the fourth lens 340 are concave.

[0201] The fifth lens 350 has positive refractive power, the object-side surface of the fifth lens 350 is convex, and the image-side surface of the fifth lens 350 is concave.

[0202] The sixth lens 360 has positive refractive power, the object-side surface of the sixth lens 360 is concave, and the image-side surface of the sixth lens 360 is convex.

[0203] The seventh lens 370 has positive refractive power, the object-side surface of the seventh lens 370 is concave, and the image-side surface of the seventh lens 370 is convex.

[0204] In addition, the second lens 320 may be coupled to the reflective member P. For example, an exit surface of the reflective member P and an object-side surface of the second lens 320 may be coupled to each other.

[0205] In an example, each surface of the first lens 310 and the third to seventh lenses 330 to 370 has an aspherical coefficient shown in Table 6. For example, the object-side surface and the image-side surface of each of the first lens 310 and the third to seventh lenses 330 to 370 are aspherical surfaces.

[0206] Table 6

[0207]

[0208]

[0209] Figure 7 An exemplary optical imaging system according to a fourth exemplary embodiment is shown, and Figure 8 Shows Figure 7 Aberration characteristics of an exemplary optical imaging system are shown.

[0210] Reference Figure 7 and Figure 8 An optical imaging system according to a fourth exemplary embodiment is described.

[0211] The optical imaging system 400 according to the fourth embodiment includes a first lens group and a second lens group. In addition, the optical imaging system further includes a reflection member P disposed in front of the second lens group.

[0212] In order from the object side to the imaging side, the first lens group includes a first lens 410 and a second lens 420 , and the second lens group includes a third lens 430 , a fourth lens 440 , a fifth lens 450 , a sixth lens 460 , and a seventh lens 470 .

[0213] The first lens group may further include a reflective member P disposed between (or adjacent to) the first lens 410 and the second lens 420 .

[0214] In an example, the first lens 410 and the third to seventh lenses 430 to 470 may be formed of plastic, and the second lens 420 may be formed of glass.

[0215] In addition, the optical imaging system may further include an optical filter 480 and an image sensor.

[0216] 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. In an example, the imaging surface 490 may refer to one surface of an image sensor on which light is received.

[0217] In the fourth embodiment, the reflective member P may be a prism. However, this is merely an example, and the reflective member P may also be provided as a reflective mirror.

[0218] The characteristics of each lens (radius of curvature, thickness of the lens or distance between lenses, refractive index, and Abbe number) are shown in Table 7 below.

[0219] Table 7

[0220]

[0221] In the example, the total focal length f of the optical imaging system according to the fourth embodiment is 19.4 mm, Fno is 3.3, and IMG HT is 4 mm.

[0222] In the fourth embodiment, the first lens group has positive refractive power as a whole, and the second lens group has negative refractive power as a whole.

[0223] An effective radius of the object-side surface of the first lens 410 of the first lens group is greater than an effective radius of the image-side surface of the first lens 410 of the first lens group.

[0224] The focal length fG1 of the first lens group is 17.593 mm, and the focal length fG2 of the second lens group is -256.883 mm.

[0225] The major axis length of the incident surface of the reflecting member P was 7.6 mm, and the minor axis length of the incident surface of the reflecting member P was 4.4 mm.

[0226] The first lens 410 has positive refractive power, the object-side surface of the first lens 410 is convex, and the image-side surface of the first lens 410 is concave.

[0227] The second lens 420 has positive refractive power, the object-side surface of the second lens 420 is flat, and the image-side surface of the second lens 420 is convex.

[0228] The third lens 430 has positive refractive power, an object-side surface of the third lens 430 is convex, and an image-side surface of the third lens 430 is concave.

[0229] 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.

[0230] The fifth lens 450 has positive refractive power, and the object-side surface and the image-side surface of the fifth lens 450 are convex.

[0231] The sixth lens 460 has positive refractive power, the object-side surface of the sixth lens 460 is concave, and the image-side surface of the sixth lens 460 is convex.

[0232] The seventh lens 470 has negative refractive power, and the object-side surface and the image-side surface of the seventh lens 470 are concave.

[0233] In addition, the second lens 420 may be coupled to the reflective member P. For example, an exit surface of the reflective member P and an object-side surface of the second lens 420 may be coupled to each other.

[0234] In an example, each surface of the first lens 410 and the third lens 430 to the seventh lens 470 has 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 lens 410 and the third lens 430 to the seventh lens 470 are aspherical surfaces.

[0235] Table 8

[0236] S1 S2 S8 S9 S10 S11 Conic constant (K) -0.055 0.216 0.144 0.000 0.000 -0.961 Fourth-order coefficient (A) 1.576E-05 3.097E-04 1.235E-03 -2.701E-03 3.820E-04 2.067E-03 Sixth order coefficient (B) 4.193E-06 1.144E-05 -3.043E-06 5.781E-04 1.250E-05 -4.364E-04 Eighth-order coefficient (C) -2.033E-07 -1.606E-08 1.492E-04 5.556E-06 -7.262E-06 -2.054E-04 Tenth order coefficient (D) -2.393E-08 -4.085E-08 -4.736E-05 1.880E-05 -7.304E-08 8.513E-06 Twelfth-order coefficient (E) -1.144E-09 -2.629E-09 1.115E-05 -2.904E-06 1.859E-06 7.254E-06 Fourteenth-order coefficient (F) 1.229E-11 8.282E-11 -1.439E-06 4.761E-07 -9.588E-08 -5.020E-06 Sixteenth-order coefficient (G) 7.956E-13 -1.967E-12 1.199E-07 3.251E-08 -1.590E-08 8.254E-07 Eighteenth-order coefficient (H) -4.220E-14 -2.338E-13 -2.581E-09 1.113E-08 -7.029E-10 -7.097E-08 Twentieth-order coefficient (J) -9.107E-15 -1.204E-14 9.342E-10 -6.754E-10 1.875E-09 -2.254E-09 S12 S13 S14 S15 S16 S17 Conic constant (K) 0.000 73.904 0.000 -1.216 9.883 -33.937 Fourth-order coefficient (A) 1.600E-04 -1.631E-03 -4.439E-03 -3.878E-03 2.011E-03 6.955E-03 Sixth order coefficient (B) -9.765E-05 1.238E-04 -4.310E-04 -1.935E-04 1.269E-03 4.264E-04 Eighth-order coefficient (C) -4.850E-05 4.219E-05 3.330E-04 5.529E-04 -2.019E-04 -1.946E-04 Tenth order coefficient (D) -1.629E-06 1.014E-05 -5.804E-05 -1.505E-04 1.068E-04 5.508E-05 Twelfth-order coefficient (E) -9.476E-07 1.789E-07 5.732E-06 2.354E-05 -3.899E-05 -1.340E-05 Fourteenth-order coefficient (F) -3.606E-09 3.443E-08 -1.623E-07 -2.148E-06 7.645E-06 2.091E-06 Sixteenth-order coefficient (G) -2.364E-08 8.172E-10 3.591E-08 1.169E-07 -8.184E-07 -1.875E-07 Eighteenth-order coefficient (H) -5.455E-09 6.378E-10 1.724E-09 -4.327E-09 4.464E-08 9.171E-09 Twentieth-order coefficient (J) 2.129E-09 -3.800E-12 -1.190E-10 4.576E-11 -1.254E-09 -1.215E-10

[0237] Fig. 9 An exemplary optical imaging system according to a fifth exemplary embodiment is shown, and Fig.10 Shows Fig. 9 Aberration characteristics of an exemplary optical imaging system are shown.

[0238] Reference Fig. 9 and Fig.10 An optical imaging system according to a fifth exemplary embodiment is described.

[0239] The optical imaging system 500 according to the fifth embodiment includes a first lens group and a second lens group. In addition, the optical imaging system further includes a reflection member P disposed in front of the second lens group.

[0240] In order from the object side to the image side, the first lens group includes a first lens 510 and a second lens 520 , and the second lens group includes a third lens 530 , a fourth lens 540 , a fifth lens 550 , a sixth lens 560 , and a seventh lens 570 .

[0241] The first lens group may further include a reflective member P disposed between the first lens 510 and the second lens 520 (or adjacent to the first lens 510 and the second lens 520 ).

[0242] In an example, the first lens 510 and the third to seventh lenses 530 to 570 may be formed of plastic, and the second lens 520 may be formed of glass.

[0243] In addition, the optical imaging system may further include an optical filter 580 and an image sensor.

[0244] 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 on which light is received.

[0245] In the fifth embodiment, the reflective member P may be a prism. However, this is merely an example, and the reflective member P may also be provided as a reflective mirror.

[0246] The characteristics of each lens (radius of curvature, thickness of the lens or distance between lenses, refractive index, and Abbe number) are shown in Table 9 below.

[0247] Table 9

[0248]

[0249]

[0250] In the example, the total focal length f of the optical imaging system according to the fifth embodiment is 19.4 mm, Fno is 3.3, and IMG HT is 4 mm.

[0251] In the fifth embodiment, the first lens group has positive refractive power as a whole, and the second lens group has negative refractive power as a whole.

[0252] The effective radius of the object-side surface of the first lens 510 of the first lens group is greater than the effective radius of the image-side surface of the first lens 510 of the first lens group.

[0253] The focal length fG1 of the first lens group is 14.8 mm, and the focal length fG2 of the second lens group is -30 mm.

[0254] The major axis length of the incident surface of the reflecting member P was 7.5 mm, and the minor axis length of the incident surface of the reflecting member P was 4.4 mm.

[0255] The first lens 510 has positive refractive power, the object-side surface of the first lens 510 is convex, and the image-side surface of the first lens 510 is concave.

[0256] The second lens 520 has positive refractive power, the object-side surface of the second lens 520 is flat, and the image-side surface of the second lens 520 is convex.

[0257] The third lens 530 has positive refractive power, and the object-side surface and the image-side surface of the third lens 530 are convex.

[0258] The fourth lens 540 has negative refractive power, and the object-side surface and the image-side surface of the fourth lens 540 are concave.

[0259] The fifth lens 550 has positive refractive power, the object-side surface of the fifth lens 550 is convex, and the image-side surface of the fifth lens 550 is concave.

[0260] The sixth lens 560 has positive refractive power, and the object-side surface and the image-side surface of the sixth lens 560 are convex.

[0261] The seventh lens 570 has negative refractive power, and the object-side surface and the image-side surface of the seventh lens 570 are concave.

[0262] In addition, the second lens 520 may be coupled to the reflective member P. For example, an exit surface of the reflective member P and an object-side surface of the second lens 520 may be coupled to each other.

[0263] In an example, each surface of the first lens 510 and the third lens 530 to the seventh lens 570 has 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 lens 510 and the third lens 530 to the seventh lens 570 are aspherical surfaces.

[0264] Table 10

[0265] S1 S2 S8 S9 S10 S11 Conic constant (K) -0.055 0.216 0.067 0.000 0.000 -0.991 Fourth-order coefficient (A) 1.576E-05 3.097E-04 1.486E-03 -2.449E-03 1.894E-04 2.191E-03 Sixth order coefficient (B) 4.193E-06 1.144E-05 -7.604E-05 6.089E-04 1.032E-06 -5.179E-04 Eighth-order coefficient (C) -2.033E-07 -1.606E-08 1.400E-04 -1.588E-06 -3.586E-06 -2.437E-04 Tenth order coefficient (D) -2.393E-08 -4.085E-08 -4.741E-05 1.609E-05 -4.610E-07 1.796E-05 Twelfth-order coefficient (E) -1.144E-09 -2.629E-09 1.134E-05 -3.548E-06 1.426E-06 7.254E-06 Fourteenth-order coefficient (F) 1.229E-11 8.282E-11 -1.395E-06 2.968E-07 -2.286E-07 -5.020E-06 Sixteenth-order coefficient (G) 7.956E-13 -1.967E-12 1.199E-07 3.251E-08 -1.590E-08 8.254E-07 Eighteenth-order coefficient (H) -4.220E-14 -2.338E-13 -2.581E-09 1.113E-08 -7.029E-10 -7.097E-08 Twentieth-order coefficient (J) -9.107E-15 -1.204E-14 9.342E-10 -6.754E-10 1.875E-09 -2.254E-09 S12 S13 S14 S15 S16 S17 Conic constant (K) 0.000 -34.394 0.000 -1.500 9.641 36.531 Fourth-order coefficient (A) 2.152E-04 -1.744E-03 -4.338E-03 -3.968E-03 2.064E-03 6.576E-03 Sixth order coefficient (B) -1.532E-04 2.315E-04 -5.209E-04 -1.432E-04 1.232E-03 3.413E-04 Eighth-order coefficient (C) -4.465E-05 5.189E-05 3.236E-04 5.621E-04 -2.147E-04 -2.029E-04 Tenth order coefficient (D) -4.882E-07 9.433E-06 -5.783E-05 -1.495E-04 1.032E-04 5.490E-05 Twelfth-order coefficient (E) -1.126E-06 2.400E-07 6.131E-06 2.371E-05 -3.975E-05 -1.316E-05 Fourteenth-order coefficient (F) -3.606E-09 1.587E-07 -7.748E-08 -2.116E-06 7.446E-06 2.169E-06 Sixteenth-order coefficient (G) -2.364E-08 8.172E-10 4.872E-08 1.205E-07 -8.468E-07 -1.725E-07 Eighteenth-order coefficient (H) -5.455E-09 6.378E-10 3.557E-09 -2.594E-09 4.215E-08 1.249E-08 Twentieth-order coefficient (J) 2.129E-09 -3.800E-12 2.721E-10 -6.859E-11 -1.254E-09 -3.352E-11

[0266] Table 11

[0267]

[0268]

[0269] Although the present disclosure includes specific examples, it will be apparent after understanding the disclosure of the present application that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are understood in a descriptive sense only and not for limiting purposes. The description of the features or aspects in each example should be considered to be applicable to similar features or aspects in other examples. If the described techniques are performed in a different order, and / or if the components in the described system, architecture, device, or circuit are combined in a different manner and / or replaced or supplemented by other components or their equivalents, appropriate results can still be achieved.

[0270] Therefore, the scope of the present disclosure includes the claims and their equivalents in addition to the above disclosure and all the accompanying drawings, that is, all modifications within the scope of the claims and their equivalents should be construed as being included in the present disclosure.

Claims

1. An optical imaging system, characterized in that: The optical imaging system includes: A first lens group including a first lens, a reflecting member, and a second lens arranged in sequence from the object side to the imaging side; and A second lens group disposed behind the second lens and including a plurality of lenses, wherein the first lens has a positive refractive power and has a convex object side surface and a concave image side surface, and wherein the first lens is spaced apart from the reflecting member and the second lens is coupled to the reflecting member.

2. The optical imaging system according to claim 1, characterized in that: The reflecting member is configured to rotate based on two axes perpendicular to each other.

3. The optical imaging system according to claim 2, characterized in that: One of the two axes is one of the optical axis of the first lens and an axis parallel to the optical axis of the first lens.

4. The optical imaging system according to claim 1, characterized in that: The reflecting member includes an incident surface, a reflecting surface, and an exit surface, and wherein the effective diameter of the object side surface of the first lens is greater than the minor axis length of the incident surface of the reflecting member.

5. The optical imaging system according to claim 1, characterized in that: The reflecting member includes an incident surface, a reflecting surface, and an exit surface, and wherein 0.9 < D11P / DP22 < 1.5, where D11P is the distance from the object side surface of the first lens to the reflecting surface of the reflecting member, and DP22 is the distance from the reflecting surface of the reflecting member to the image side surface of the second lens.

6. The optical imaging system according to claim 1, characterized in that: 0.5 < |RG1_S1 / RG1_S2| < 1.2 is satisfied, 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.

7. The optical imaging system according to claim 1, characterized in that: 1.7 < n_p < 2.0 is satisfied, where n_p is the refractive index of the reflecting member.

8. The optical imaging system according to claim 1, characterized in that: -0.7 < fG1 / fG2 < 0 is satisfied, where fG1 is the total focal length of the first lens group and fG2 is the total focal length of the second lens group.

9. The optical imaging system according to claim 1, characterized in that: 0.4 < f / f1 < 0.75 is satisfied, where f is the total focal length of the optical imaging system and f1 is the focal length of the first lens.

10. The optical imaging system according to claim 1, characterized in that: 0.1 < f / f2 < 1.1 is satisfied, where f is the total focal length of the optical imaging system and f2 is the focal length of the second lens.

11. The optical imaging system according to claim 1, characterized in that: -0.35 < (RG1_S1 - RG1_S2) / (RG1_S1 + RG1_S2) < 0 is satisfied, 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.

12. The optical imaging system according to claim 1, characterized in that: The reflecting member includes an incident surface, a reflecting surface, and an exit surface, and wherein 1 < D11P / DR < 1.3 is satisfied, where D11P is the distance from the object side surface of the first lens to the reflecting surface of the reflecting member, and DR is the distance from the incident surface of the reflecting member to the reflecting surface of the reflecting member.

13. The optical imaging system according to claim 1, characterized in that: The reflecting member includes an incident surface, a reflecting surface, and an exit surface, and Among them, 0.4 < D12P / DR < 0.6 is satisfied, where D12P is the distance from the image side of the first lens to the incident surface of the reflection member, and DR is the distance from the incident surface of the reflection member to the reflection surface of the reflection member.

14. The optical imaging system according to claim 1, characterized in that: The second lens has a positive refractive power and has a convex image side.

15. The optical imaging system according to claim 1, characterized in that: At least three lenses among the plurality of lenses of the second lens group have a refractive index greater than 1.

6.

16. An optical imaging system, characterized in that The optical imaging system includes: A reflection member; A first lens having a positive refractive power and disposed in front of the incident surface of the reflection member; and A second lens coupled to the exit surface of the reflection member and configured to rotate together with the reflection member, wherein the first lens is spaced apart from the reflection member.

17. The optical imaging system according to claim 16, characterized in that: The optical imaging system includes a total of seven lenses.

18. The optical imaging system according to claim 16, characterized in that: The first lens has a convex object side and a concave image side.

19. The optical imaging system according to claim 16, characterized in that: The second lens has a flat object side.

Images