Optical imaging system

Abstract

An optical imaging system includes a first lens group having positive refractive power and a second lens group having positive refractive power disposed in order along an optical axis of the optical imaging system from an object side of the optical imaging system toward an image plane of the optical imaging system, wherein the first lens group includes a first reflecting member including a first reflecting surface, the second lens group includes a plurality of lenses, the optical imaging system further includes a second reflecting member disposed behind the second lens group, the second reflecting member includes a second reflecting surface and a third reflecting surface, and 0.50 < fG1 / fG2 < 2.50 is satisfied, where fG1 is a focal length of the first lens group, and fG2 is a focal length of the second lens group.

Description

[0001] Cross-references to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2025-0021499, filed on February 19, 2025, with the Korean Intellectual Property Office, and Korean Patent Application No. 10-2025-0177278, filed on November 20, 2025, the entire disclosure of which is incorporated herein by reference for all purposes. Technical Field

[0003] This disclosure relates to optical imaging systems. Background Technology

[0004] The portable terminal may include a camera module to enable video calls and image capture, and the camera module may include an optical imaging system comprising multiple lenses.

[0005] Recently, even in camera modules for portable devices, optical imaging systems with narrow field of view (e.g., telephoto lenses) have been applied. However, due to the physical characteristics of portable devices, there are technical difficulties in realizing such optical imaging systems with small size and low F-number (Fno).

[0006] Therefore, it is necessary to study the structure of optical imaging systems with small size and low Fno that can be applied to portable terminals. Summary of the Invention

[0007] The summary portion of this invention is intended to provide a brief overview of the chosen concepts, which will be further described in the detailed description portion below. This summary portion is not intended to identify key or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter.

[0008] In one general aspect, the optical imaging system includes a first lens group and a second lens group having positive refractive power, arranged sequentially along the optical axis of the optical imaging system from the object side of the optical imaging system toward the imaging surface of the optical imaging system. The first lens group includes a first reflecting member, which includes a first reflecting surface. The second lens group includes a plurality of lenses. The optical imaging system also includes a second reflecting member disposed behind the second lens group. The second reflecting member includes a second reflecting surface and a third reflecting surface, and satisfies 0.50 < fG1 / fG2 < 2.50, where fG1 is the focal length of the first lens group and fG2 is the focal length of the second lens group.

[0009] The second reflective surface may be disposed behind the second lens group, the third reflective surface may be spaced apart from the second reflective surface in a direction perpendicular to the optical axis of the second lens group, and the second reflective member may be configured to be movable along the optical axis of the second lens group.

[0010] It can satisfy 0.50 < a / f < 1.00, where a is the distance between the center of the first reflecting surface and the center of the second reflecting surface when the second reflecting member is positioned closest to the second lens group, and f is the total focal length of the optical imaging system.

[0011] It can satisfy 0.30 < a / TTL < 0.60, where a is the distance between the center of the first reflecting surface and the center of the second reflecting surface when the second reflecting member is positioned closest to the second lens group, and TTL is the sum of the distances along the optical axis of the optical imaging system from the first surface of the first lens group to the first reflecting surface, from the first reflecting surface to the second reflecting surface, from the second reflecting surface to the third reflecting surface, and from the third reflecting surface to the imaging surface.

[0012] It can satisfy 0.100 < AFd / (f-fi) < 0.600, where AFd is the distance between the position of the second reflecting member located closest to the second lens group and the position of the second reflecting member located farthest from the second lens group, f is the total focal length of the optical imaging system, and fi is (object distance × f) / (object distance + f).

[0013] The optical imaging system may further include an image sensor, which includes an imaging surface. The image sensor may be spaced apart from the third reflecting surface in a direction parallel to the optical axis of the second lens group. The second and third reflecting surfaces may be spaced apart from each other in a direction perpendicular to the optical axis of the second lens group, and the following conditions may be met: h2 + Him < b, where h2 is the effective radius of the object side of the first lens closest to the first lens group among the multiple lenses of the second lens group, Him is half the length of the imaging surface in the direction in which the second and third reflecting surfaces are spaced apart from each other, and b is the distance between the center of the second and third reflecting surfaces.

[0014] It can satisfy 0.20 < f / fG1 < 0.90, where f is the total focal length of the optical imaging system.

[0015] It can satisfy 0.40 < f / fG2 < 1.10, where f is the total focal length of the optical imaging system.

[0016] It can satisfy 0.10 < RG1_S1 / fG1 < 0.60, where RG1_S1 is the radius of curvature of the first surface of the first lens group.

[0017] It can satisfy 0.60 < fG1 / TTL < 1.60, where TTL is the sum of the distances along the optical axis from the first surface of the first lens group to the first reflecting surface, from the first reflecting surface to the second reflecting surface, from the second reflecting surface to the third reflecting surface, and from the third reflecting surface to the imaging surface.

[0018] It can satisfy 3.50 < f / h1 < 5.50, where f is the total focal length of the optical imaging system and h1 is the effective radius of the first surface of the first lens group.

[0019] It can satisfy 0.40 < h2 / h1 < 0.80, where h1 is the effective radius of the first surface of the first lens group, and h2 is the effective radius of the object side surface of the first lens closest to the first lens group among the multiple lenses of the second lens group.

[0020] It can satisfy 0.40 < BFL / TTL < 0.70, where BFL is the sum of the distances along the optical axis from the last surface of the second lens group to the second reflecting surface, from the second reflecting surface to the third reflecting surface, and from the third reflecting surface to the imaging surface, and TTL is the sum of the distances along the optical axis from the first surface of the first lens group to the first reflecting surface, from the first reflecting surface to the second reflecting surface, from the second reflecting surface to the third reflecting surface, and from the third reflecting surface to the imaging surface.

[0021] The first reflecting member may also include an incident surface and an exit surface, and the paraxial region of the incident surface may have a convex shape.

[0022] The first lens group may further include a front lens disposed in front of the first reflecting member, and the front lens may have positive refractive power.

[0023] The second lens group may include: a first lens with positive refractive power; a second lens with refractive power; a third lens with negative refractive power; a fourth lens with refractive power; and a fifth lens with positive refractive power, and the first to fifth lenses are arranged sequentially from the object side of the second lens group toward the image side of the second lens group along the optical axis of the second lens group.

[0024] The second lens can have negative refractive power, and the fourth lens can have positive refractive power.

[0025] The optical imaging system may further include an image sensor, which includes an imaging surface. The image sensor may be spaced apart from the third reflecting surface in a direction parallel to the optical axis of the second lens group. The second and third reflecting surfaces may be spaced apart from each other in a direction perpendicular to the optical axis of the second lens group, and may satisfy 0.50 < (h2 + Him) / b < 0.80, where h2 is the effective radius of the object side of the first lens closest to the first lens group among the multiple lenses of the second lens group, Him is half the length of the imaging surface in the direction in which the second and third reflecting surfaces are spaced apart from each other, and b is the distance between the center of the second reflecting surface and the center of the third reflecting surface.

[0026] It can satisfy 0.15 < |(RG1_S1-RG1_S2) / (RG1_S1+RG1_S2)| < 0.60, where RG1_S1 is the radius of curvature of the first surface of the first lens group, and RG1_S2 is the radius of curvature of the last surface of the first lens group with curvature.

[0027] It can satisfy 0 < h2 / fG1 < 0.1, where h2 is the effective radius of the object side of the first lens closest to the first lens in the second lens group.

[0028] It can satisfy 7.0 < TTL / (2×IMG HT) < 11.0, where TTL is the sum of the distances along the optical axis from the first surface of the first lens group to the first reflecting surface, from the first reflecting surface to the second reflecting surface, from the second reflecting surface to the third reflecting surface, and from the third reflecting surface to the imaging surface, and IMG HT is half the diagonal length of the imaging surface.

[0029] Other features and aspects will become apparent from the following detailed description and accompanying drawings. Attached Figure Description

[0030] Figure 1 This is a schematic side view of an optical imaging system according to an embodiment of the present disclosure.

[0031] Figure 2 yes Figure 1 A schematic plan view of the optical imaging system shown.

[0032] Figure 3 This is a schematic side view of an optical imaging system according to another embodiment of the present disclosure.

[0033] Figure 4 yes Figure 3 A schematic plan view of the optical imaging system shown.

[0034] Figure 5 This is a configuration diagram of an optical imaging system according to a first embodiment of the present disclosure.

[0035] Figure 6 It is shown Figure 5 The graph shows the aberration characteristics of the optical imaging system.

[0036] Figure 7 This is a configuration diagram of an optical imaging system according to a second embodiment of the present disclosure.

[0037] Figure 8 It is shown Figure 7 The graph shows the aberration characteristics of the optical imaging system.

[0038] Figure 9 This is a configuration diagram of an optical imaging system according to a third embodiment of the present disclosure.

[0039] Figure 10 It is shown Figure 9 The graph shows the aberration characteristics of the optical imaging system.

[0040] Figure 11 This is a configuration diagram of an optical imaging system according to a fourth embodiment of the present disclosure.

[0041] Figure 12 It is shown Figure 11 The graph shows the aberration characteristics of the optical imaging system.

[0042] Figure 13 This is a configuration diagram of an optical imaging system according to a fifth embodiment of the present disclosure.

[0043] Figure 14 It is shown Figure 13 The graph shows the aberration characteristics of the optical imaging system.

[0044] Figure 15 This is a configuration diagram of an optical imaging system according to a sixth embodiment of the present disclosure.

[0045] Figure 16 It is shown Figure 15 The graph shows the aberration characteristics of the optical imaging system.

[0046] Figure 17 This is a configuration diagram of an optical imaging system according to the seventh embodiment of the present disclosure.

[0047] Figure 18 It is shown Figure 17 The graph shows the aberration characteristics of the optical imaging system.

[0048] Figure 19This is a configuration diagram of an optical imaging system according to the eighth embodiment of the present disclosure.

[0049] Figure 20 It is shown Figure 19 The graph shows the aberration characteristics of the optical imaging system.

[0050] Figure 21 This is a configuration diagram of an optical imaging system according to the ninth embodiment of the present disclosure.

[0051] Figure 22 It is shown Figure 21 The graph shows the aberration characteristics of the optical imaging system.

[0052] Figure 23 This is a configuration diagram of an optical imaging system according to the tenth embodiment of the present disclosure.

[0053] Figure 24 It is shown Figure 23 The graph shows the aberration characteristics of the optical imaging system.

[0054] Throughout the accompanying drawings and detailed embodiments, 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 dimensions, scale, and depiction of elements in the drawings may be exaggerated. Detailed Implementation

[0055] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein, except for operations that must occur in a specific order, as will become apparent upon understanding the disclosure of this application. Furthermore, for clarity and conciseness, descriptions of features well-known in the art may be omitted.

[0056] The features described herein may be implemented in various 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 in which the methods, apparatus, and / or systems described herein will be apparent upon understanding the disclosure of this application.

[0057] Throughout this specification, when an element such as a layer, region, or substrate is described as being "on," "connected to," or "attached to" another element, the element may be directly "on," directly "connected to," or directly "attached to" the other element, or there may be one or more other elements between the element and the other element. Conversely, when an element is described as being "directly on," "directly connected to," or "directly attached to" another element, there are no other elements between the element and the other element.

[0058] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more items.

[0059] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited by these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or section from another. Therefore, without departing from the teachings of the examples described herein, the first component, first part, first region, first layer, or first section mentioned in these examples may also be referred to as a second component, second part, second region, second layer, or second section.

[0060] Spatial relative terms such as “above,” “above,” “below,” and “under” may be used herein for descriptive convenience to describe the relationship of one element relative to another, as shown in the accompanying drawings. In addition to covering the orientation depicted in the drawings, these spatial relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “above” another element would be located “below” or “under” that other element. Thus, 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 spatial relative terms used herein should be interpreted accordingly.

[0061] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the terms “a,” “an,” and “the” are intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0062] In the accompanying drawings, the thickness, size, and shape of the lenses may be exaggerated for illustrative purposes. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are presented as examples only, and this disclosure is not limited thereto.

[0063] Furthermore, as used herein, all values ​​of the radius of curvature, thickness, distance, focal length, and other measurements of lenses or other elements may be expressed in millimeters (mm), and the field of view (FOV) may be expressed in degrees (°).

[0064] Furthermore, in the description of the shape of a lens, the statement that the surface of the lens has a convex shape means that the paraxial region of the surface has a convex shape, and the statement that the surface of the lens has a concave shape means that the paraxial region of the surface has a concave shape.

[0065] Therefore, even when the surface describing the lens has a convex shape, the edge portion of that surface can have a concave shape. Similarly, even when the surface describing the lens has a concave shape, the edge portion of that surface can have a convex shape.

[0066] The paraxial region of a lens surface is a very narrow area surrounding the optical axis of the lens surface.

[0067] More specifically, 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 sin θ ≈ θ, tan θ ≈ θ, and cos θ ≈ 1 are valid.

[0068] An imaging surface can refer to a virtual surface on which an optical imaging system focuses light. Alternatively, an imaging surface can refer to a surface on which an image sensor receives light and focuses it.

[0069] Figure 1 This is a schematic side view of an optical imaging system according to an embodiment of the present disclosure, and Figure 2 yes Figure 1 A schematic plan view of the optical imaging system shown.

[0070] Reference Figure 1 and Figure 2 An optical imaging system according to embodiments of the present disclosure may include multiple lens groups. In an example, the optical imaging system may include a first lens group LG1 and a second lens group LG2.

[0071] The first lens group LG1 and the second lens group LG2 can each have refractive power. For example, the first lens group LG1 can have positive refractive power, and the second lens group LG2 can have positive refractive power.

[0072] The optical imaging system according to embodiments of the present disclosure may further include a first reflecting member P1, which has a reflective surface that changes the direction of light travel. The first reflecting member P1 may be a mirror or a prism. The first reflecting member P1 may be a component included in the first lens group LG1.

[0073] By bending the path of light by the first reflecting member P1, a long light path can be formed in a relatively narrow space.

[0074] Therefore, it is possible to have a long focal length in optical imaging systems while reducing the size of the optical imaging system.

[0075] The optical imaging system according to embodiments of the present disclosure may have the characteristics of a telephoto lens with a relatively narrow field of view and a long focal length.

[0076] The first lens group LG1 may include a first reflecting member P1, and the second lens group LG2 may include multiple lenses.

[0077] The first reflecting member P1 may include an incident surface PS1, a first reflecting surface R1, and an exiting surface PS2. The incident surface PS1 may be disposed in front of the first reflecting surface R1, and the exiting surface PS2 may be disposed behind the first reflecting surface R1. Light reflected from an object may be incident on the incident surface PS1 of the first reflecting member P1, the light incident on the incident surface PS1 may be reflected from the first reflecting surface R1, and the light reflected from the first reflecting surface R1 may exit through the exiting surface PS2.

[0078] Either or both of the incident surface PS1 and the exit surface PS2 may have curvature. For example, the paraxial region of the incident surface PS1 may have a convex shape, and the paraxial region of the exit surface PS2 may have a concave shape.

[0079] exist Figure 1 and Figure 2 In this embodiment, the first surface of the first lens group LG1 may refer to the incident surface PS1. The last surface of the first lens group LG1 may refer to the outgoing surface PS2.

[0080] The incident surface PS1 and the exit surface PS2 of the first reflecting member P1 can be either an aspherical surface. In an embodiment, the incident surface PS1 can be an aspherical surface, and the exit surface PS2 can be a spherical surface.

[0081] Therefore, light reflected from the object can be refracted while incident on the incident surface PS1, and can also be incident on the first reflecting surface R1. Light reflected from the first reflecting surface R1 can be refracted when exiting through the exit surface PS2. That is to say, the first reflecting member P1 can be a component with refractive power.

[0082] To reduce the size of the optical imaging system, it may be necessary to reduce the diameter of the lenses included in the second lens group LG2, which is positioned behind the first reflective member P1. However, as the lens diameter decreases, the F-number (Fno) of the optical imaging system may increase, leading to a problem where the captured image is too dark.

[0083] Therefore, the optical imaging system according to the embodiments of the present disclosure can reduce Fno of the optical imaging system by allowing the first reflective member P1 to have positive refractive power.

[0084] The first reflecting member P1 can be configured to have positive refractive power, such that the first reflecting member P1 can be used as a convex lens (i.e., light emitted from the first reflecting member P1 can be refracted to converge).

[0085] Therefore, the second lens group LG2 can be configured to have a small diameter. Thus, while reducing the Fno of the optical imaging system, the size of the optical imaging system (the height in the direction on which light is incident on the incident surface PS1 of the first reflecting member P1) can be reduced.

[0086] The first reflective element P1 can be positioned in front of the second lens group LG2. The first reflective element P1 can rotate about two axes to perform optical image stabilization (OIS) during image capture.

[0087] In other words, when jitter occurs during image capture or video recording due to factors such as user hand tremors or other disturbances, the jitter can be compensated by rotating the first reflective member P1 about two axes in response to the jitter or other disturbances.

[0088] The second reflecting member P2 can be disposed behind the second lens group LG2. The second reflecting member P2 can have multiple reflecting surfaces. For example, the second reflecting member P2 can include a second reflecting surface R2 and a third reflecting surface R3. The second reflecting member P2 can be a single member including the second reflecting surface R2 and the third reflecting surface R3, but this disclosure is not limited thereto, and the reflecting member having the second reflecting surface R2 and the reflecting member having the third reflecting surface R3 can be set as separate components.

[0089] The second reflective surface R2 can be disposed behind the second lens group LG2, and the third reflective surface R3 can be spaced apart from the second reflective surface R2 in a direction perpendicular to the optical axis of the second lens group LG2.

[0090] Light that has passed through the second lens group LG2 can be reflected from the second reflecting surface R2, and the light reflected from the second reflecting surface R2 can be reflected again from the third reflecting surface R3.

[0091] Light reflected from the third reflective surface R3 can be incident on the imaging surface of the image sensor IS. The light reflected from the third reflective surface R3 can be substantially parallel to the optical axis of the second lens group LG2.

[0092] The imaging surface of the image sensor IS can be spaced apart from the third reflective surface R3 in the direction of the optical axis of the second lens group LG2.

[0093] In this embodiment, light that has passed through the second lens group LG2 can be reflected by approximately 90° from the second reflective surface R2. Furthermore, light reflected from the second reflective surface R2 can be reflected by approximately 90° from the third reflective surface R3. That is, light that has passed through the second lens group LG2 can be reflected in a "U" shape by the second reflective member P2.

[0094] In an embodiment, the second reflective member P2 may be in the shape of a quadrilateral prism with two trapezoidal surfaces.

[0095] The second reflecting member P2 can move in the direction of the optical axis of the second lens group LG2 (or in the direction parallel to the optical axis of the second lens group LG2).

[0096] Therefore, the distance between the second lens group LG2 and the image sensor IS can be changed by moving the second reflective member P2, thereby enabling the autofocus (AF) function.

[0097] Furthermore, light can be reflected twice by the second reflective member P2, which allows the movement distance of the second reflective member P2 to be significantly reduced during autofocus.

[0098] Therefore, the size of the optical imaging system can be reduced.

[0099] In this embodiment, when the object distance is infinite, the distance between the second reflecting member P2 and the second lens group LG2 can be minimized. When the object distance is any finite distance, the second reflecting member P2 can move in a direction away from the second lens group LG2.

[0100] The second lens group LG2 may include multiple lenses. The multiple lenses may be spaced apart from each other by a predetermined distance along the optical axis of the second lens group LG2.

[0101] In an embodiment, the second lens group LG2 may include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially along the optical axis of the second lens group LG2 from the object side of the second lens group LG2 toward the image side of the second lens group LG2.

[0102] The first lens may have positive refractive power. Furthermore, the first lens may have a meniscus shape that convexes towards the object side. For example, the paraxial region of the object-side surface of the first lens may have a convex shape, and the paraxial region of the image-side surface of the first lens may have a concave shape.

[0103] Alternatively, the corresponding paraxial regions of the two surfaces of the first lens may have a convex shape. For example, the paraxial region of the object-side surface and the paraxial region of the image-side surface of the first lens may each have a convex shape.

[0104] The second lens can have negative refractive power. Furthermore, the second lens can have a meniscus shape that convexes towards the object side. For example, the paraxial region of the object-side side of the second lens can have a convex shape, and the paraxial region of the image-side side of the second lens can have a concave shape.

[0105] The third lens can have negative refractive power. Furthermore, the corresponding paraxial regions on the two surfaces of the third lens can have concave shapes. For example, the paraxial region on the object side and the paraxial region on the image side of the third lens can each have a concave shape.

[0106] The fourth lens can have positive refractive power. Furthermore, the corresponding paraxial regions on the two surfaces of the fourth lens can have a convex shape. For example, the paraxial region on the object side and the paraxial region on the image side of the fourth lens can each have a convex shape.

[0107] Alternatively, the fourth lens may have a meniscus shape that convexes toward the image side. For example, the paraxial region of the object side of the fourth lens may have a concave shape, and the paraxial region of the image side of the fourth lens may have a convex shape.

[0108] The fifth lens can have positive refractive power. Furthermore, the corresponding paraxial regions on the two surfaces of the fifth lens can have a convex shape. For example, the paraxial region on the object side and the paraxial region on the image side of the fifth lens can each have a convex shape.

[0109] The optical imaging system may also include an image sensor IS for converting an image of an object incident on the image sensor IS into an electrical signal. Light reflected from the third reflective surface R3 of the second reflective member P2 can be received by the imaging surface of the image sensor IS.

[0110] Reference Figure 1In a side view of the optical imaging system, the image sensor IS can be considered to be located between the second lens group LG2 and the second reflective member P2.

[0111] In addition, the optical imaging system may also include an infrared filter (not shown) for blocking infrared light. The filter may be disposed between the image sensor IS and the second reflective member P2. For example, the filter may be disposed between the image sensor IS and the third reflective surface R3.

[0112] In addition, the optical imaging system may also include an aperture stop for adjusting the amount of light passing through the optical imaging system. The aperture stop may be positioned between the second lens and the third lens.

[0113] Multiple lenses included in the second lens group LG2 can be made of plastic material.

[0114] In addition, at least one of the multiple lenses may have an aspherical surface.

[0115] In an embodiment, the object-side surface and image-side surface of each of the first to fifth lenses can be aspherical surfaces.

[0116] The aspherical surface of each lens can be represented by Equation 1 below.

[0117] (1)

[0118] 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. K is the quadratic constant, and Y is the distance from any point on the aspherical surface of the lens to the optical axis. Furthermore, constants A through H are aspherical surface coefficients. Z (also called sag) is the distance between a point on the aspherical surface of the lens at a distance Y from the optical axis and a tangent plane perpendicular to the optical axis and intersecting the vertex of the aspherical surface, in a direction parallel to the optical axis.

[0119] An optical imaging system can satisfy any one or any combination of any two or more of the following conditional expressions 1 to 46.

[0120] 0.50 < fG1 / fG2 < 2.50 (Conditional expression 1)

[0121] 0.82 < fG1 / fG2 < 2.17 (Conditional expression 2)

[0122] 0.913 < fG1 / fG2 < 1.972 (Conditional expression 3)

[0123] h2+Him < b (conditional expression 4)

[0124] 0.50 < a / f < 1.00 (Conditional expression 5)

[0125] 0.62 < a / f < 0.86 (Conditional expression 6)

[0126] 0.691 < a / f ≤ 0.782 (Conditional expression 7)

[0127] 0.100 < AFd / (f-fi) < 0.600 (Conditional expression 8)

[0128] 0.410 < AFd / (f-fi) < 0.520 (Conditional expression 9)

[0129] 0.456 ≤ AFd / (f-fi) < 0.474 (Conditional expression 10)

[0130] 0.50 < (h2+Him) / b < 0.80 (Conditional expression 11)

[0131] 0.54 < (h2+Him) / b < 0.73 (Conditional expression 12)

[0132] 0.602 ≤ (h2+Him) / b ≤ 0.666 (Conditional expression 13)

[0133] 0.20 < f / fG1 < 0.90 (Conditional expression 14)

[0134] 0.40 < f / fG1 < 0.78 (Conditional expression 15)

[0135] 0.436 ≤ f / fG1 ≤ 0.710 (Conditional expression 16)

[0136] 0.40 < f / fG2 < 1.10 (Conditional expression 17)

[0137] 0.58 < f / fG2 < 0.95 (Conditional expression 18)

[0138] 0.648 < f / fG2 < 0.861 (Conditional expression 19)

[0139] 0.10 < RG1_S1 / fG1 < 0.60 (Conditional expression 20)

[0140] 0.20 < RG1_S1 / fG1 < 0.40 (Conditional expression 21)

[0141] 0.216 < RG1_S1 / fG1 < 0.364 (Conditional expression 22)

[0142] 0.60 < fG1 / TTL < 1.60 (Conditional expression 23)

[0143] 0.80 < fG1 / TTL < 1.55 (Conditional expression 24)

[0144] 0.886 ≤ fG1 / TTL < 1.469 (Conditional expression 25)

[0145] 3.50 < f / h1 < 5.50 (Conditional expression 26)

[0146] 3.70 < f / h1 < 5.20 (Conditional expression 27)

[0147] 3.973 ≤ f / h1 < 4.912 (Conditional expression 28)

[0148] 0.30 < a / TTL < 0.60 (Conditional expression 29)

[0149] 0.40 < a / TTL < 0.52 (Conditional expression 30)

[0150] 0.435 ≤ a / TTL < 0.483 (Conditional expression 31)

[0151] 0.40 < h2 / h1 < 0.80 (Conditional expression 32)

[0152] 0.50 < h2 / h1 < 0.70 (Conditional expression 33)

[0153] 0.512 ≤ h2 / h1 < 0.662 (Conditional expression 34)

[0154] 0.40 < BFL / TTL < 0.70 (Conditional expression 35)

[0155] 0.45 < BFL / TTL < 0.60 (Conditional expression 36)

[0156] 0.475 ≤ BFL / TTL < 0.524 (Conditional expression 37)

[0157] 0.15 < |(RG1_S1-RG1_S2) / (RG1_S1+RG1_S2)| < 0.60

[0158] (Conditional expression 38)

[0159] 0.20 < |(RG1_S1-RG1_S2) / (RG1_S1+RG1_S2)| < 0.52

[0160] (Conditional Expression 39)

[0161] 0.221 < |(RG1_S1-RG1_S2) / (RG1_S1+RG1_S2)| ≤ 0.479

[0162] (Conditional expression 40)

[0163] 0 < h2 / fG1 < 0.1 (Conditional expression 41)

[0164] 0.05 < h2 / fG1 < 0.09 (Conditional expression 42)

[0165] 0.058 ≤ h2 / fG1 ≤ 0.083 (Conditional expression 43)

[0166] 7.0 < TTL / (2×IMG HT) < 11.0 (Conditional expression 44)

[0167] 7.48 < TTL / (2×IMG HT) < 10.28 (Conditional expression 45)

[0168] 8.312 ≤ TTL / (2×IMG HT) ≤ 9.344 (Conditional expression 46)

[0169] In this embodiment, the optical imaging system can satisfy 0.50 < fG1 / fG2 < 2.50 (conditional expression 1). Here, fG1 can be the focal length of the first lens group LG1, and fG2 can be the focal length of the second lens group LG2.

[0170] The optical imaging system can satisfy 0.50 < fG1 / fG2 < 2.50, thereby reducing its size (e.g., the height in the direction on which light is incident on the incident surface PS1 of the first reflective member P1).

[0171] Preferably, the optical imaging system can satisfy 0.82 < fG1 / fG2 < 2.17 (condition expression 2). More preferably, the optical imaging system can satisfy 0.913 < fG1 / fG2 < 1.972 (condition expression 3).

[0172] In this embodiment, the optical imaging system can satisfy h2 + Him < b (conditional expression 4). Here, h2 can be the effective radius of the object side of the first lens of the second lens group LG2, Him can be half the length of the imaging surface in the horizontal direction, and b can be the horizontal distance between the center of the second reflecting surface R2 and the center of the third reflecting surface R3. The horizontal direction can refer to the direction from the second reflecting surface R2 to the third reflecting surface R3 (or its opposite direction).

[0173] An optical imaging system can satisfy h2+Him < b, thereby reducing its size (e.g., the length of the second lens group LG2 in the optical axis direction).

[0174] In an embodiment, the optical imaging system can satisfy 0.50 < a / f < 1.00 (conditional expression 5). Here, a can be the distance between the center of the first reflecting surface R1 of the first reflecting member P1 and the center of the second reflecting surface R2 of the second reflecting member P2 when the object distance is infinite (i.e., when the second reflecting member P2 is at its closest position to the second lens group LG2), and f can be the total focal length of the optical imaging system.

[0175] The optical imaging system can satisfy 0.50 < a / f < 1.00, thereby reducing its size (e.g., the length of the second lens group LG2 in the optical axis direction).

[0176] Preferably, the optical imaging system can satisfy 0.62 < a / f < 0.86 (condition expression 6). More preferably, the optical imaging system can satisfy 0.691 < a / f ≤ 0.782 (condition expression 7).

[0177] In this embodiment, the optical imaging system can satisfy 0.100 < AFd / (f-fi) < 0.600 (conditional expression 8). Here, AFd can be the amount of movement of the second reflecting member P2 between the position when the object distance is infinite and the position when the object distance is minimum, and fi can be (object distance × f) / (object distance + f). In this embodiment, the minimum object distance can be 300 mm, so fi_300 can be (300 × f) / (300 + f). The amount of movement of the second reflecting member P2 can be the distance between the position of the second reflecting member P2 located closest to the second lens group LG2 (when the object distance is infinite) and the position of the second reflecting member P2 located farthest from the second lens group LG2 (when the object distance is minimum).

[0178] The optical imaging system can satisfy 0.100 < AFd / (f-fi) < 0.600, thereby reducing its size (e.g., the length of the second lens group LG2 in the optical axis direction).

[0179] Preferably, the optical imaging system can satisfy 0.410 < AFd / (f-fi) < 0.520 (condition expression 9). More preferably, the optical imaging system can satisfy 0.456 ≤ AFd / (f-fi) < 0.474 (condition expression 10).

[0180] In this embodiment, the optical imaging system can satisfy 0.50 < (h2+Him) / b < 0.80 (conditional expression 11).

[0181] Therefore, the size of the optical imaging system can be reduced (e.g., the length of the second lens group LG2 in the optical axis direction).

[0182] Preferably, the optical imaging system can satisfy 0.54 < (h2+Him) / b < 0.73 (conditional expression 12). More preferably, the optical imaging system can satisfy 0.602 ≤ (h2+Him) / b ≤ 0.666 (conditional expression 13).

[0183] In this embodiment, the optical imaging system can satisfy 0.20 < f / fG1 < 0.90 (conditional expression 14).

[0184] Therefore, the diameter of the lens included in the second lens group LG2 can be reduced by optimizing the focal length of the first lens group LG1, which has positive refractive power.

[0185] Preferably, the optical imaging system can satisfy 0.40 < f / fG1 < 0.78 (condition expression 15). More preferably, the optical imaging system can satisfy 0.436 ≤ f / fG1 ≤ 0.710 (condition expression 16).

[0186] In this embodiment, the optical imaging system can satisfy 0.40 < f / fG2 < 1.10 (conditional expression 17).

[0187] Therefore, resolution can be improved by optimizing the focal length of the second lens group LG2.

[0188] Preferably, the optical imaging system can satisfy 0.58 < f / fG2 < 0.95 (conditional expression 18). More preferably, the optical imaging system can satisfy 0.648 < f / fG2 < 0.861 (conditional expression 19).

[0189] In this embodiment, the optical imaging system may satisfy 0.10 < RG1_S1 / fG1 < 0.60 (conditional expression 20). Here, RG1_S1 may be the radius of curvature of the first surface of the first lens group LG1. The first surface of the first lens group LG1 may be the surface closest to the object side of the optical imaging system.

[0190] Therefore, the occurrence of aberrations can be minimized.

[0191] Preferably, the optical imaging system can satisfy 0.20 < RG1_S1 / fG1 < 0.40 (condition expression 21). More preferably, the optical imaging system can satisfy 0.216 < RG1_S1 / fG1 < 0.364 (condition expression 22).

[0192] In an embodiment, the optical imaging system may satisfy 0.60 < fG1 / TTL < 1.60 (conditional expression 23). Here, TTL may be the sum of the distances along the optical axis from the first surface of the first lens group LG1 to the first reflecting surface R1 of the first reflecting member P1, from the first reflecting surface R1 of the first reflecting member P1 to the second reflecting surface R2 of the second reflecting member P2, from the second reflecting surface R2 of the second reflecting member P2 to the third reflecting surface R3 of the second reflecting member P2, and from the third reflecting surface R3 of the second reflecting member P2 to the imaging plane. As used herein, TTL may be based on the position of the second reflecting member P2 when the object distance is infinite.

[0193] Therefore, the size of the optical imaging system can be reduced by optimizing the focal length of the first lens group LG1.

[0194] Preferably, the optical imaging system can satisfy 0.80 < fG1 / TTL < 1.55 (condition expression 24). More preferably, the optical imaging system can satisfy 0.886 ≤ fG1 / TTL < 1.469 (condition expression 25).

[0195] In this embodiment, the optical imaging system can satisfy 3.50 < f / h1 < 5.50 (conditional expression 26). Here, h1 can be the effective radius of the first surface of the first lens group LG1.

[0196] Therefore, image brightness and resolution can be improved.

[0197] Preferably, the optical imaging system can satisfy 3.70 < f / h1 < 5.20 (condition expression 27). More preferably, the optical imaging system can satisfy 3.973 ≤ f / h1 < 4.912 (condition expression 28).

[0198] In this embodiment, the optical imaging system can satisfy 0.30 < a / TTL < 0.60 (conditional expression 29).

[0199] Therefore, the size of the optical imaging system can be reduced.

[0200] Preferably, the optical imaging system can satisfy 0.40 < a / TTL < 0.52 (condition expression 30). More preferably, the optical imaging system can satisfy 0.435 ≤ a / TTL < 0.483 (condition expression 31).

[0201] In this embodiment, the optical imaging system can satisfy 0.40 < h2 / h1 < 0.80 (conditional expression 32).

[0202] Therefore, image brightness can be improved, and the size of the optical imaging system can be reduced.

[0203] Preferably, the optical imaging system can satisfy 0.50 < h2 / h1 < 0.70 (condition expression 33). More preferably, the optical imaging system can satisfy 0.512 ≤ h2 / h1 < 0.662 (condition expression 34).

[0204] In an embodiment, the optical imaging system may satisfy 0.40 < BFL / TTL < 0.70 (conditional expression 35). Here, BFL can be the sum of the distances along the optical axis from the last surface of the second lens group LG2 to the second reflecting surface R2 of the second reflecting member P2, the distances along the optical axis from the second reflecting surface R2 of the second reflecting member P2 to the third reflecting surface R3 of the second reflecting member P2, and the distances along the optical axis from the third reflecting surface R3 of the second reflecting member P2 to the imaging plane. The last surface of the second lens group LG2 may be the surface closest to the second reflecting member P2 (e.g., the image-side surface of the fifth lens). Furthermore, as used herein, BFL may be based on the position of the second reflecting member P2 when the object distance is infinite.

[0205] Therefore, the size of the optical imaging system can be reduced.

[0206] Preferably, the optical imaging system can satisfy 0.45 < BFL / TTL < 0.60 (condition expression 36). More preferably, the optical imaging system can satisfy 0.475 ≤ BFL / TTL < 0.524 (condition expression 37).

[0207] In an embodiment, the optical imaging system can satisfy 0.15 < |(RG1_S1-RG1_S2) / (RG1_S1+RG1_S2)| < 0.60 (conditional expression 38). Here, RG1_S2 can be the radius of curvature of the last surface of the first lens group LG1. The last surface of the first lens group LG1 can refer to the surface of the first lens group LG1 that is closest to the second lens group LG2 among the curved surfaces of the first lens group LG1.

[0208] Therefore, the aberrations occurring in the first lens group LG1 can be minimized.

[0209] Preferably, the optical imaging system satisfies 0.20 < |(RG1_S1-RG1_S2) / (RG1_S1+RG1_S2)| < 0.52 (conditional expression 39). More preferably, the optical imaging system satisfies 0.221 < |(RG1_S1-RG1_S2) / (RG1_S1+RG1_S2)| ≤ 0.479 (conditional expression 40).

[0210] In the embodiment, the optical imaging system can satisfy 0 < h2 / fG1 < 0.1 (conditional expression 41).

[0211] Therefore, the diameter of the first lens in the second lens group LG2 can be reduced by optimizing the focal length of the first lens group LG1, which has positive refractive power.

[0212] Preferably, the optical imaging system can satisfy 0.05 < h2 / fG1 < 0.09 (condition expression 42). More preferably, the optical imaging system can satisfy 0.058 ≤ h2 / fG1 ≤ 0.083 (condition expression 43).

[0213] In this embodiment, the optical imaging system can satisfy 7.0 < TTL / (2×IMG HT) < 11.0 (conditional expression 44). Here, IMG HT can be half the diagonal length of the imaging plane.

[0214] Therefore, the size of the optical imaging system can be reduced while achieving telephoto capabilities with a narrow field of view.

[0215] Preferably, the optical imaging system can satisfy 7.48 < TTL / (2×IMG HT) < 10.28 (condition expression 45). More preferably, the optical imaging system can satisfy 8.312 ≤ TTL / (2×IMG HT) ≤ 9.344 (condition expression 46).

[0216] Figure 3 This is a schematic side view of an optical imaging system according to another embodiment of the present disclosure. Figure 4 yes Figure 3 A schematic plan view of the optical imaging system shown.

[0217] Figure 3 and Figure 4 The embodiment shown can be configured with respect to the first lens group LG1. Figure 1 and Figure 2 The embodiments shown are different.

[0218] The first lens group LG1 may further include a front lens FL disposed in front of the first reflecting member P1. The first reflecting member P1 may have a triangular prism shape.

[0219] In an embodiment, the incident surface PS1 and the exit surface PS2 of the first reflective member P1 can be planar surfaces.

[0220] In another embodiment, the incident surface PS1 of the first reflecting member P1 may be a flat surface, and the exiting surface PS2 may have curvature. For example, the paraxial region of the exiting surface PS2 may have a concave shape.

[0221] exist Figure 3 and Figure 4 In one embodiment, the first surface of the first lens group LG1 may refer to the object side of the front lens FL.

[0222] The front lens FL of the first lens group LG1 may include one or more lenses. The front lens FL may have positive refractive power.

[0223] In an embodiment, the front lens FL may include a single lens. The front lens FL may have positive refractive power. Furthermore, the front lens FL may have a meniscus shape that convex toward the object side. For example, the paraxial region of the object side of the front lens FL may have a convex shape, and the paraxial region of the image side of the front lens FL may have a concave shape.

[0224] The front lens FL can be made of plastic material, and either or both of the object side and image side of the front lens FL can be aspherical surfaces.

[0225] In an embodiment, the object side of the front lens FL can be an aspherical surface, and the image side of the front lens FL can be a spherical surface.

[0226] In this embodiment, both the object-side surface and the image-side surface of the front lens FL can be aspherical surfaces.

[0227] The optical axis of the front lens FL and the optical axis of the second lens group LG2 can be perpendicular to each other. In an embodiment, the optical axis direction of the front lens FL can be substantially parallel to the thickness direction of the portable terminal in which the optical imaging system is mounted, and the optical axis direction of the second lens group LG2 can be substantially parallel to the length or width direction of the portable terminal.

[0228] Figure 5 This is a configuration diagram of an optical imaging system according to a first embodiment of the present disclosure, and Figure 6 It is shown Figure 5 The graph shows the aberration characteristics of the optical imaging system.

[0229] Reference Figure 5 and Figure 6 An optical imaging system 100 according to a first embodiment of the present disclosure is described. Figure 5 The optical path of the optical imaging system 100 according to the first embodiment of the present disclosure in the deployed state is schematically shown.

[0230] Reference Figure 5 The optical imaging system 100 according to the first embodiment of the present disclosure may include a first lens group LG1 and a second lens group LG2.

[0231] The first lens group LG1 may include a first reflecting member P1, and the second lens group LG2 may include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140 and a fifth lens 150 arranged sequentially along the optical axis of the second lens group LG2 from the object side of the second lens group LG2 toward the image side of the second lens group LG2.

[0232] The first reflective component P1 may include, for example: Figure 1 The incident surface PS1, the first reflecting surface R1, and the exit surface PS2 are shown in the diagram.

[0233] The optical imaging system 100 may further include a second reflective member P2 disposed behind the second lens group LG2. The second reflective member P2 may include, for example: Figure 2 The second reflective surface R2 and the third reflective surface R3 are shown in the figure.

[0234] In addition, the optical imaging system 100 may also include a filter IF and an imaging surface IP disposed after the second reflective member P2.

[0235] The imaging surface IP can refer to the surface on which the optical imaging system 100 forms a focal point. For example, the imaging surface IP can refer to a surface of the image sensor IS that receives light, such as... Figure 1 and Figure 2 As shown in the image.

[0236] An aperture stop can be positioned between the second lens 120 and the third lens 130. For example, the aperture stop can be positioned at the edge of the object side of the third lens 130.

[0237] The characteristics of each element (radius of curvature, element thickness or distance between elements, refractive index, Abbe number and effective radius) are listed in Table 1 below.

[0238] Table 1

[0239] For reference, the “distance” in Table 1 can be based on the position of the second reflecting member P2 when the object distance is infinite.

[0240] In the first embodiment of this disclosure, the first reflecting member P1 may have positive refractive power, the paraxial region of the incident surface PS1 of the first reflecting member P1 may have a convex shape, and the paraxial region of the exit surface PS2 of the first reflecting member P1 may have a concave shape.

[0241] The first lens 110 may have positive refractive power, the paraxial region on the object side of the first lens 110 may have a convex shape, and the paraxial region on the image side of the first lens 110 may have a concave shape.

[0242] The second lens 120 may have negative refractive power, the paraxial region on the object side of the second lens 120 may have a convex shape, and the paraxial region on the image side of the second lens 120 may have a concave shape.

[0243] The third lens 130 may have negative refractive power, and the corresponding paraxial regions of the object side and image side of the third lens 130 may each have a concave shape.

[0244] The fourth lens 140 may have positive refractive power, and the corresponding paraxial regions of the object side and image side of the fourth lens 140 may each have a convex shape.

[0245] The fifth lens 150 may have positive refractive power, and the corresponding paraxial regions of the object side and image side of the fifth lens 150 may each have a convex shape.

[0246] One surface of the first reflecting member P1 and two surfaces of each of the first lenses 110 to the fifth lenses 150 may have aspherical surface coefficients as listed in Table 2 below. For example, the incident surface PS1 of the first reflecting member P1 may be an aspherical surface, the exit surface PS2 of the first reflecting member P1 may be a spherical surface, and the object-side surface and image-side surface of each of the first lenses 110 to the fifth lenses 150 may be aspherical surfaces.

[0247] Table 2

[0248] Furthermore, the optical imaging system 100 configured as described above may have Figure 6 The aberration characteristics shown are illustrated.

[0249] Figure 7 This is a configuration diagram of an optical imaging system according to a second embodiment of the present disclosure, and Figure 8 It is shown Figure 7 The graph shows the aberration characteristics of the optical imaging system.

[0250] Reference Figure 7 and Figure 8 An optical imaging system 200 according to a second embodiment of the present disclosure is described. Figure 7 The optical path of the optical imaging system 200 according to the second embodiment of the present disclosure in the deployed state is schematically shown.

[0251] Reference Figure 7 The optical imaging system 200 according to the second embodiment of the present disclosure may include a first lens group LG1 and a second lens group LG2.

[0252] The first lens group LG1 may include a first reflecting member P1, and the second lens group LG2 may include a first lens 210, a second lens 220, a third lens 230, a fourth lens 240 and a fifth lens 250 arranged sequentially along the optical axis of the second lens group LG2 from the object side of the second lens group LG2 toward the image side of the second lens group LG2.

[0253] The first reflective component P1 may include, for example: Figure 1 The incident surface PS1, the first reflecting surface R1, and the exit surface PS2 are shown in the diagram.

[0254] The optical imaging system 200 may further include a second reflective member P2 disposed behind the second lens group LG2. The second reflective member P2 may include, for example: Figure 2 The second reflective surface R2 and the third reflective surface R3 are shown in the figure.

[0255] In addition, the optical imaging system 200 may also include a filter IF and an imaging surface IP disposed after the second reflective member P2.

[0256] The imaging surface IP can refer to the surface on which the optical imaging system 200 forms a focal point. For example, the imaging surface IP can refer to a surface of the image sensor IS that receives light, such as... Figure 1 and Figure 2 As shown in the image.

[0257] An aperture stop can be positioned between the second lens 220 and the third lens 230. For example, the aperture stop can be positioned at the edge of the object side of the third lens 230.

[0258] The characteristics of each element (radius of curvature, element thickness or distance between elements, refractive index, Abbe number and effective radius) are listed in Table 3 below.

[0259] Table 3

[0260] For reference, the “distance” in Table 3 can be based on the position of the second reflecting member P2 when the object distance is infinite.

[0261] In the second embodiment of this disclosure, the first reflecting member P1 may have positive refractive power, the paraxial region of the incident surface PS1 of the first reflecting member P1 may have a convex shape, and the paraxial region of the exit surface PS2 of the first reflecting member P1 may have a concave shape.

[0262] The first lens 210 may have positive refractive power, the paraxial region on the object side of the first lens 210 may have a convex shape, and the paraxial region on the image side of the first lens 210 may have a concave shape.

[0263] The second lens 220 may have negative refractive power, the paraxial region on the object side of the second lens 220 may have a convex shape, and the paraxial region on the image side of the second lens 220 may have a concave shape.

[0264] The third lens 230 may have negative refractive power, and the corresponding paraxial regions of the object side and image side of the third lens 230 may each have a concave shape.

[0265] The fourth lens 240 may have positive refractive power, and the corresponding paraxial regions of the object side and image side of the fourth lens 240 may each have a convex shape.

[0266] The fifth lens 250 can have positive refractive power, and the corresponding paraxial regions of the object side and image side of the fifth lens 250 can each have a convex shape.

[0267] One surface of the first reflecting member P1 and two surfaces of each of the first lenses 210 to the fifth lenses 250 may have aspherical surface coefficients as listed in Table 4 below. For example, the incident surface PS1 of the first reflecting member P1 may be an aspherical surface, the exit surface PS2 of the first reflecting member P1 may be a spherical surface, and the object-side surface and image-side surface of each of the first lenses 210 to the fifth lenses 250 may be aspherical surfaces.

[0268] Table 4

[0269] Furthermore, the optical imaging system 200 configured as described above may have Figure 8 The aberration characteristics shown are illustrated.

[0270] Figure 9 This is a configuration diagram of an optical imaging system according to a third embodiment of the present disclosure, and Figure 10 It is shown Figure 9 The graph shows the aberration characteristics of the optical imaging system.

[0271] Reference Figure 9 and Figure 10 An optical imaging system 300 according to a third embodiment of the present disclosure is described. Figure 9 The optical path of the optical imaging system 300 according to the third embodiment of the present disclosure in the deployed state is schematically shown.

[0272] Reference Figure 9 The optical imaging system 300 according to the third embodiment of the present disclosure may include a first lens group LG1 and a second lens group LG2.

[0273] The first lens group LG1 may include a first reflecting member P1, and the second lens group LG2 may include a first lens 310, a second lens 320, a third lens 330, a fourth lens 340 and a fifth lens 350 arranged sequentially along the optical axis of the second lens group LG2 from the object side of the second lens group LG2 toward the image side of the second lens group LG2.

[0274] The first reflective component P1 may include, for example: Figure 1 The incident surface PS1, the first reflecting surface R1, and the exit surface PS2 are shown in the diagram.

[0275] The optical imaging system 300 may further include a second reflective member P2 disposed behind the second lens group LG2. The second reflective member P2 may include, for example: Figure 2 The second reflective surface R2 and the third reflective surface R3 are shown in the figure.

[0276] In addition, the optical imaging system 300 may also include a filter IF and an imaging surface IP disposed after the second reflective member P2.

[0277] The imaging surface IP can refer to the surface on which the optical imaging system 300 forms a focal point. For example, the imaging surface IP can refer to a surface of the image sensor IS that receives light, such as... Figure 1 and Figure 2 As shown in the image.

[0278] An aperture stop can be positioned between the second lens 320 and the third lens 330. For example, the aperture stop can be positioned at the edge of the object side of the third lens 330.

[0279] The characteristics of each element (radius of curvature, element thickness or distance between elements, refractive index, Abbe number and effective radius) are listed in Table 5 below.

[0280] Table 5

[0281] For reference, the “distance” in Table 5 can be based on the position of the second reflecting member P2 when the object distance is infinite.

[0282] In the third embodiment of this disclosure, the first reflecting member P1 may have positive refractive power, the paraxial region of the incident surface PS1 of the first reflecting member P1 may have a convex shape, and the paraxial region of the exit surface PS2 of the first reflecting member P1 may have a concave shape.

[0283] The first lens 310 may have positive refractive power, the paraxial region on the object side of the first lens 310 may have a convex shape, and the paraxial region on the image side of the first lens 310 may have a concave shape.

[0284] The second lens 320 may have negative refractive power, the paraxial region on the object side of the second lens 320 may have a convex shape, and the paraxial region on the image side of the second lens 320 may have a concave shape.

[0285] The third lens 330 may have negative refractive power, and the corresponding paraxial regions of the object side and image side of the third lens 330 may each have a concave shape.

[0286] The fourth lens 340 may have positive refractive power, and the corresponding paraxial regions of the object side and image side of the fourth lens 340 may each have a convex shape.

[0287] The fifth lens 350 can have positive refractive power, and the corresponding paraxial regions of the object side and image side of the fifth lens 350 can each have a convex shape.

[0288] One surface of the first reflecting member P1 and two surfaces of each of the first lens 310 to the fifth lens 350 may have aspherical surface coefficients as listed in Table 6 below. For example, the incident surface PS1 of the first reflecting member P1 may be an aspherical surface, the exit surface PS2 of the first reflecting member P1 may be a spherical surface, and the object side and image side of each of the first lens 310 to the fifth lens 350 may be aspherical surfaces.

[0289] Table 6

[0290] Furthermore, the optical imaging system 300 configured as described above can have Figure 10 The aberration characteristics shown are illustrated.

[0291] Figure 11 This is a configuration diagram of an optical imaging system according to a fourth embodiment of the present disclosure, and Figure 12 It is shown Figure 11 The graph shows the aberration characteristics of the optical imaging system.

[0292] Reference Figure 11 and Figure 12 An optical imaging system 400 according to a fourth embodiment of the present disclosure is described. Figure 11 The optical path of the optical imaging system 400 according to the fourth embodiment of the present disclosure in the deployed state is schematically shown.

[0293] Reference Figure 11 The optical imaging system 400 according to the fourth embodiment of the present disclosure may include a first lens group LG1 and a second lens group LG2.

[0294] The first lens group LG1 may include a first reflecting member P1, and the second lens group LG2 may include a first lens 410, a second lens 420, a third lens 430, a fourth lens 440 and a fifth lens 450 arranged sequentially along the optical axis of the second lens group LG2 from the object side of the second lens group LG2 toward the image side of the second lens group LG2.

[0295] The first reflective component P1 may include, for example: Figure 1 The incident surface PS1, the first reflecting surface R1, and the exit surface PS2 are shown in the diagram.

[0296] The optical imaging system 400 may further include a second reflective member P2 disposed behind the second lens group LG2. The second reflective member P2 may include, for example: Figure 2 The second reflective surface R2 and the third reflective surface R3 are shown in the figure.

[0297] In addition, the optical imaging system 400 may also include a filter IF and an imaging surface IP disposed after the second reflective member P2.

[0298] The imaging surface IP can refer to the surface on which the optical imaging system 400 forms a focal point. For example, the imaging surface IP can refer to a surface of the image sensor IS that receives light, such as... Figure 1 and Figure 2 As shown in the image.

[0299] An aperture stop can be positioned between the second lens 420 and the third lens 430. For example, the aperture stop can be positioned at the edge of the object side of the third lens 430.

[0300] The characteristics of each element (radius of curvature, element thickness or distance between elements, refractive index, Abbe number and effective radius) are listed in Table 7 below.

[0301] Table 7

[0302] For reference, the “distance” in Table 7 can be based on the position of the second reflecting element P2 when the object distance is infinite.

[0303] In the fourth embodiment of this disclosure, the first reflecting member P1 may have positive refractive power, the paraxial region of the incident surface PS1 of the first reflecting member P1 may have a convex shape, and the paraxial region of the exit surface PS2 of the first reflecting member P1 may have a concave shape.

[0304] The first lens 410 may have positive refractive power, the paraxial region on the object side of the first lens 410 may have a convex shape, and the paraxial region on the image side of the first lens 410 may have a concave shape.

[0305] The second lens 420 may have negative refractive power, the paraxial region on the object side of the second lens 420 may have a convex shape, and the paraxial region on the image side of the second lens 420 may have a concave shape.

[0306] The third lens 430 may have negative refractive power, and the corresponding paraxial regions of the object side and image side of the third lens 430 may each have a concave shape.

[0307] The fourth lens 440 may have positive refractive power, and the corresponding paraxial regions of the object side and image side of the fourth lens 440 may each have a convex shape.

[0308] The fifth lens 450 may have positive refractive power, and the corresponding paraxial regions of the object side and image side of the fifth lens 450 may each have a convex shape.

[0309] One surface of the first reflecting member P1 and two surfaces of each of the first lenses 410 to the fifth lenses 450 may have aspherical surface coefficients as listed in Table 8 below. For example, the incident surface PS1 of the first reflecting member P1 may be an aspherical surface, the exit surface PS2 of the first reflecting member P1 may be a spherical surface, and the object-side surface and image-side surface of each of the first lenses 410 to the fifth lenses 450 may be aspherical surfaces.

[0310] Table 8

[0311] Furthermore, the optical imaging system 400 configured as described above can have Figure 12 The aberration characteristics shown are illustrated.

[0312] Figure 13 This is a configuration diagram of an optical imaging system according to a fifth embodiment of the present disclosure, and Figure 14 It is shown Figure 13 The graph shows the aberration characteristics of the optical imaging system.

[0313] Reference Figure 13 and Figure 14 An optical imaging system 500 according to a fifth embodiment of the present disclosure is described. Figure 13 The optical path of the optical imaging system 500 according to the fifth embodiment of the present disclosure in the deployed state is schematically shown.

[0314] Reference Figure 13 The optical imaging system 500 according to the fifth embodiment of the present disclosure may include a first lens group LG1 and a second lens group LG2.

[0315] The first lens group LG1 may include a first reflecting member P1, and the second lens group LG2 may include a first lens 510, a second lens 520, a third lens 530, a fourth lens 540 and a fifth lens 550 arranged sequentially along the optical axis of the second lens group LG2 from the object side of the second lens group LG2 toward the image side of the second lens group LG2.

[0316] The first reflective component P1 may include, for example: Figure 1 The incident surface PS1, the first reflecting surface R1, and the exit surface PS2 are shown in the diagram.

[0317] The optical imaging system 500 may further include a second reflective member P2 disposed behind the second lens group LG2. The second reflective member P2 may include, for example: Figure 2 The second reflective surface R2 and the third reflective surface R3 are shown in the figure.

[0318] In addition, the optical imaging system 500 may also include a filter IF and an imaging surface IP disposed after the second reflective member P2.

[0319] The imaging surface IP can refer to the surface on which the optical imaging system 500 forms a focal point. For example, the imaging surface IP can refer to a surface of the image sensor IS that receives light, such as... Figure 1 and Figure 2 As shown in the image.

[0320] An aperture stop can be positioned between the second lens 520 and the third lens 530. For example, the aperture stop can be positioned at the edge of the object side of the third lens 530.

[0321] The characteristics of each element (radius of curvature, element thickness or distance between elements, refractive index, Abbe number and effective radius) are listed in Table 9 below.

[0322] Table 9

[0323] For reference, the “distance” in Table 9 can be based on the position of the second reflecting element P2 when the object distance is infinite.

[0324] In the fifth embodiment of this disclosure, the first reflecting member P1 may have positive refractive power, the paraxial region of the incident surface PS1 of the first reflecting member P1 may have a convex shape, and the paraxial region of the exit surface PS2 of the first reflecting member P1 may have a concave shape.

[0325] The first lens 510 may have positive refractive power, the paraxial region on the object side of the first lens 510 may have a convex shape, and the paraxial region on the image side of the first lens 510 may have a concave shape.

[0326] The second lens 520 may have negative refractive power, the paraxial region on the object side of the second lens 520 may have a convex shape, and the paraxial region on the image side of the second lens 520 may have a concave shape.

[0327] The third lens 530 may have negative refractive power, and the corresponding paraxial regions of the object side and image side of the third lens 530 may each have a concave shape.

[0328] The fourth lens 540 may have positive refractive power, and the corresponding paraxial regions of the object side and image side of the fourth lens 540 may each have a convex shape.

[0329] The fifth lens 550 may have positive refractive power, and the corresponding paraxial regions of the object side and image side of the fifth lens 550 may each have a convex shape.

[0330] One surface of the first reflecting member P1 and two surfaces of each of the first lenses 510 to the fifth lenses 550 may have aspherical surface coefficients as listed in Table 10 below. For example, the incident surface PS1 of the first reflecting member P1 may be an aspherical surface, the exit surface PS2 of the first reflecting member P1 may be a spherical surface, and the object-side surface and image-side surface of each of the first lenses 510 to the fifth lenses 550 may be aspherical surfaces.

[0331] Table 10

[0332] Furthermore, the optical imaging system 500 configured as described above may have Figure 14 The aberration characteristics shown are illustrated.

[0333] Figure 15 This is a configuration diagram of an optical imaging system according to a sixth embodiment of the present disclosure, and Figure 16 It is shown Figure 15 The graph shows the aberration characteristics of the optical imaging system.

[0334] Reference Figure 15 and Figure 16 An optical imaging system 600 according to a sixth embodiment of the present disclosure is described. Figure 15 The optical path of the optical imaging system 600 according to the sixth embodiment of the present disclosure in the deployed state is schematically shown.

[0335] Reference Figure 15 The optical imaging system 600 according to the sixth embodiment of the present disclosure may include a first lens group LG1 and a second lens group LG2.

[0336] The first lens group LG1 may include a front lens FL and a first reflecting member P1, and the second lens group LG2 may include a first lens 610, a second lens 620, a third lens 630, a fourth lens 640 and a fifth lens 650 arranged sequentially along the optical axis of the second lens group LG2 from the object side of the second lens group LG2 toward the image side of the second lens group LG2.

[0337] The front lens FL can be positioned in front of the first reflecting member P1.

[0338] The first reflective component P1 may include, for example: Figure 3 The incident surface PS1, the first reflecting surface R1, and the exit surface PS2 are shown in the diagram.

[0339] The optical imaging system 600 may further include a second reflective member P2 disposed behind the second lens group LG2. The second reflective member P2 may include, for example: Figure 4 The second reflective surface R2 and the third reflective surface R3 are shown in the figure.

[0340] In addition, the optical imaging system 600 may also include a filter IF and an imaging surface IP disposed after the second reflective member P2.

[0341] The imaging surface IP can refer to the surface on which the optical imaging system 600 forms a focal point. For example, the imaging surface IP can refer to a surface of the image sensor IS that receives light, such as... Figure 3 and Figure 4As shown in the image.

[0342] An aperture stop can be positioned between the second lens 620 and the third lens 630. For example, the aperture stop can be positioned at the edge of the object side of the third lens 630.

[0343] The characteristics of each element (radius of curvature, element thickness or distance between elements, refractive index, Abbe number and effective radius) are listed in Table 11 below.

[0344] Table 11

[0345] For reference, the “distance” in Table 11 can be based on the position of the second reflecting member P2 when the object distance is infinite.

[0346] In the sixth embodiment of this disclosure, the front lens FL may have positive refractive power, the paraxial region on the object side of the front lens FL may have a convex shape, and the paraxial region on the image side of the front lens FL may have a concave shape.

[0347] The first lens 610 may have positive refractive power, the paraxial region on the object side of the first lens 610 may have a convex shape, and the paraxial region on the image side of the first lens 610 may have a concave shape.

[0348] The second lens 620 may have negative refractive power, the paraxial region on the object side of the second lens 620 may have a convex shape, and the paraxial region on the image side of the second lens 620 may have a concave shape.

[0349] The third lens 630 may have negative refractive power, and the corresponding paraxial regions of the object side and image side of the third lens 630 may each have a concave shape.

[0350] The fourth lens 640 may have positive refractive power, and the corresponding paraxial regions of the object side and image side of the fourth lens 640 may each have a convex shape.

[0351] The fifth lens 650 can have positive refractive power, and the corresponding paraxial regions of the object side and image side of the fifth lens 650 can each have a convex shape.

[0352] One surface of the front lens FL and two surfaces of each of the first lenses 610 to the fifth lenses 650 may have aspherical surface coefficients as listed in Table 12 below. For example, the object side of the front lens FL may be an aspherical surface, the image side of the front lens FL may be a spherical surface, and the object side and image side of each of the first lenses 610 to the fifth lenses 650 may be aspherical surfaces.

[0353] Table 12

[0354] Furthermore, the optical imaging system 600 configured as described above can have Figure 16 The aberration characteristics shown are illustrated.

[0355] Figure 17 This is a configuration diagram of an optical imaging system according to the seventh embodiment of the present disclosure, and Figure 18 It is shown Figure 17 The graph shows the aberration characteristics of the optical imaging system.

[0356] Reference Figure 17 and Figure 18 An optical imaging system 700 according to a seventh embodiment of the present disclosure is described. Figure 17 The optical path of the optical imaging system 700 according to the seventh embodiment of the present disclosure in the deployed state is schematically shown.

[0357] Reference Figure 17 The optical imaging system 700 according to the seventh embodiment of the present disclosure may include a first lens group LG1 and a second lens group LG2.

[0358] The first lens group LG1 may include a front lens FL and a first reflecting member P1, and the second lens group LG2 may include a first lens 710, a second lens 720, a third lens 730, a fourth lens 740 and a fifth lens 750 arranged sequentially along the optical axis of the second lens group LG2 from the object side of the second lens group LG2 toward the image side of the second lens group LG2.

[0359] The front lens FL can be positioned in front of the first reflecting member P1.

[0360] The first reflective component P1 may include, for example: Figure 3 The incident surface PS1, the first reflecting surface R1, and the exit surface PS2 are shown in the diagram.

[0361] The optical imaging system 700 may further include a second reflective member P2 disposed behind the second lens group LG2. The second reflective member P2 may include, for example: Figure 4 The second reflective surface R2 and the third reflective surface R3 are shown in the figure.

[0362] In addition, the optical imaging system 700 may also include a filter IF and an imaging surface IP disposed after the second reflective member P2.

[0363] The imaging surface IP can refer to the surface on which the optical imaging system 700 forms a focal point. For example, the imaging surface IP can refer to a surface of the image sensor IS that receives light, such as... Figure 3 and Figure 4As shown in the image.

[0364] An aperture stop can be positioned between the second lens 720 and the third lens 730. For example, the aperture stop can be positioned at the edge of the object side of the third lens 730.

[0365] The characteristics of each element (radius of curvature, element thickness or distance between elements, refractive index, Abbe number and effective radius) are listed in Table 13 below.

[0366] Table 13

[0367] For reference, the “distance” in Table 13 can be based on the position of the second reflecting member P2 when the object distance is infinite.

[0368] In the seventh embodiment of this disclosure, the front lens FL may have positive refractive power, the paraxial region on the object side of the front lens FL may have a convex shape, and the paraxial region on the image side of the front lens FL may have a concave shape.

[0369] The first lens 710 may have positive refractive power, the paraxial region on the object side of the first lens 710 may have a convex shape, and the paraxial region on the image side of the first lens 710 may have a concave shape.

[0370] The second lens 720 may have negative refractive power, the paraxial region on the object side of the second lens 720 may have a convex shape, and the paraxial region on the image side of the second lens 720 may have a concave shape.

[0371] The third lens 730 may have negative refractive power, and the corresponding paraxial regions of the object side and image side of the third lens 730 may each have a concave shape.

[0372] The fourth lens 740 can have positive refractive power, and the corresponding paraxial regions of the object side and image side of the fourth lens 740 can each have a convex shape.

[0373] The fifth lens 750 can have positive refractive power, and the corresponding paraxial regions of the object side and image side of the fifth lens 750 can each have a convex shape.

[0374] The two surfaces of the front lens FL and the two surfaces of each of the first lenses 710 to the fifth lenses 750 may have aspherical surface coefficients as listed in Table 12 below. For example, the object-side surface and the image-side surface of the front lens FL may both be aspherical surfaces, and the object-side surface and the image-side surface of each of the first lenses 710 to the fifth lenses 750 may both be aspherical surfaces.

[0375] Table 14

[0376] Furthermore, the optical imaging system 700 configured as described above may have Figure 18 The aberration characteristics shown are illustrated.

[0377] Figure 19 This is a configuration diagram of an optical imaging system according to the eighth embodiment of this disclosure, and Figure 20 It is shown Figure 19 The graph shows the aberration characteristics of the optical imaging system.

[0378] Reference Figure 19 and Figure 20 An optical imaging system 800 according to an eighth embodiment of the present disclosure is described. Figure 19 The optical path of the optical imaging system 800 according to the eighth embodiment of the present disclosure in the deployed state is schematically shown.

[0379] Reference Figure 19 The optical imaging system 800 according to the eighth embodiment of the present disclosure may include a first lens group LG1 and a second lens group LG2.

[0380] The first lens group LG1 may include a front lens FL and a first reflecting member P1, and the second lens group LG2 may include a first lens 810, a second lens 820, a third lens 830, a fourth lens 840 and a fifth lens 850 arranged sequentially along the optical axis of the second lens group LG2 from the object side of the second lens group LG2 toward the image side of the second lens group LG2.

[0381] The front lens FL can be positioned in front of the first reflecting member P1.

[0382] The first reflective component P1 may include, for example: Figure 3 The incident surface PS1, the first reflecting surface R1, and the exit surface PS2 are shown in the diagram.

[0383] The optical imaging system 800 may further include a second reflective member P2 disposed behind the second lens group LG2. The second reflective member P2 may include, for example: Figure 4 The second reflective surface R2 and the third reflective surface R3 are shown in the figure.

[0384] In addition, the optical imaging system 800 may also include a filter IF and an imaging surface IP disposed after the second reflective member P2.

[0385] The imaging surface IP can refer to the surface on which the optical imaging system 800 forms a focal point. For example, the imaging surface IP can refer to a surface of the image sensor IS on which light is received, such as... Figure 3 and Figure 4 As shown in the image.

[0386] An aperture stop can be positioned between the second lens 820 and the third lens 830. For example, the aperture stop can be positioned at the edge of the object side of the third lens 830.

[0387] The characteristics of each element (radius of curvature, element thickness or distance between elements, refractive index, Abbe number and effective radius) are listed in Table 15 below.

[0388] Table 15

[0389] For reference, the “distance” in Table 15 can be based on the position of the second reflecting member P2 when the object distance is infinite.

[0390] In the eighth embodiment of this disclosure, the front lens FL may have positive refractive power, the paraxial region on the object side of the front lens FL may have a convex shape, and the paraxial region on the image side of the front lens FL may have a concave shape.

[0391] The first lens 810 may have positive refractive power, the paraxial region on the object side of the first lens 810 may have a convex shape, and the paraxial region on the image side of the first lens 810 may have a concave shape.

[0392] The second lens 820 may have negative refractive power, the paraxial region on the object side of the second lens 820 may have a convex shape, and the paraxial region on the image side of the second lens 820 may have a concave shape.

[0393] The third lens 830 may have negative refractive power, and the corresponding paraxial regions of the object side and image side of the third lens 830 may each have a concave shape.

[0394] The fourth lens 840 may have positive refractive power, the paraxial region on the object side of the fourth lens 840 may have a concave shape, and the paraxial region on the image side of the fourth lens 840 may have a convex shape.

[0395] The fifth lens 850 may have positive refractive power, and the corresponding paraxial regions of the object side and image side of the fifth lens 850 may have a convex shape.

[0396] The two surfaces of the front lens FL and the two surfaces of each of the first lens 810 to the fifth lens 850 may have aspherical surface coefficients as listed in Table 16 below. For example, the object-side surface and the image-side surface of the front lens FL may both be aspherical surfaces, and the object-side surface and the image-side surface of each of the first lens 810 to the fifth lens 850 may both be aspherical surfaces.

[0397] Table 16

[0398] Furthermore, the optical imaging system 800 configured as described above may have Figure 20 The aberration characteristics shown are illustrated.

[0399] Figure 21 This is a configuration diagram of an optical imaging system according to the ninth embodiment of this disclosure, and Figure 22 It is shown Figure 21 The graph shows the aberration characteristics of the optical imaging system.

[0400] Reference Figure 21 and Figure 22 An optical imaging system 900 according to a ninth embodiment of the present disclosure is described. Figure 21 The optical path of the optical imaging system 900 according to the ninth embodiment of the present disclosure in the deployed state is schematically shown.

[0401] Reference Figure 21 The optical imaging system 900 according to the ninth embodiment of the present disclosure may include a first lens group LG1 and a second lens group LG2.

[0402] The first lens group LG1 may include a front lens FL and a first reflecting member P1, and the second lens group LG2 may include a first lens 910, a second lens 920, a third lens 930, a fourth lens 940 and a fifth lens 950 arranged sequentially along the optical axis of the second lens group LG2 from the object side of the second lens group LG2 toward the image side of the second lens group LG2.

[0403] The front lens FL can be positioned in front of the first reflecting member P1.

[0404] The first reflective component P1 may include, for example: Figure 3 The incident surface PS1, the first reflecting surface R1, and the exit surface PS2 are shown in the diagram.

[0405] The optical imaging system 900 may further include a second reflective member P2 disposed behind the second lens group LG2. The second reflective member P2 may include, for example: Figure 4 The second reflective surface R2 and the third reflective surface R3 are shown in the figure.

[0406] In addition, the optical imaging system 900 may also include a filter IF and an imaging surface IP disposed after the second reflective member P2.

[0407] The imaging surface IP can refer to the surface on which the optical imaging system 900 forms a focal point. For example, the imaging surface IP can refer to a surface of the image sensor IS that receives light, such as... Figure 3 and Figure 4 As shown in the image.

[0408] An aperture stop can be positioned between the second lens 920 and the third lens 930. For example, the aperture stop can be positioned at the edge of the object side of the third lens 930.

[0409] The characteristics of each element (radius of curvature, element thickness or distance between elements, refractive index, Abbe number and effective radius) are listed in Table 17 below.

[0410] Table 17

[0411] For reference, the “distance” in Table 17 can be based on the position of the second reflecting element P2 when the object distance is infinite.

[0412] In the ninth embodiment of this disclosure, the front lens FL may have positive refractive power, the paraxial region on the object side of the front lens FL may have a convex shape, and the paraxial region on the image side of the front lens FL may have a concave shape.

[0413] The first lens 910 may have positive refractive power, the paraxial region on the object side of the first lens 910 may have a convex shape, and the paraxial region on the image side of the first lens 910 may have a concave shape.

[0414] The second lens 920 may have negative refractive power, the paraxial region on the object side of the second lens 920 may have a convex shape, and the paraxial region on the image side of the second lens 920 may have a concave shape.

[0415] The third lens 930 may have negative refractive power, and the corresponding paraxial regions of the object side and image side of the third lens 930 may each have a concave shape.

[0416] The fourth lens 940 can have positive refractive power, and the corresponding paraxial regions of the object side and image side of the fourth lens 940 can each have a convex shape.

[0417] The fifth lens 950 can have positive refractive power, and the corresponding paraxial regions of the object side and image side of the fifth lens 950 can each have a convex shape.

[0418] The two surfaces of the front lens FL and the surface of each of the first lenses 910 to the fifth lenses 950 may have aspherical surface coefficients as listed in Table 18 below. For example, the object-side and image-side surfaces of the front lens FL may both be aspherical surfaces, and the object-side and image-side surfaces of each of the first lenses 910 to the fifth lenses 950 may both be aspherical surfaces.

[0419] Table 18

[0420] Furthermore, the optical imaging system 900 configured as described above can have Figure 22 The aberration characteristics shown are illustrated.

[0421] Figure 23 This is a configuration diagram of an optical imaging system according to the tenth embodiment of this disclosure, and Figure 24 It is shown Figure 23 The graph shows the aberration characteristics of the optical imaging system.

[0422] Reference Figure 23 and Figure 24 An optical imaging system 1000 according to a tenth embodiment of the present disclosure is described. Figure 23 The optical path of the optical imaging system 1000 according to the tenth embodiment of the present disclosure in the unfolded state is schematically shown.

[0423] An optical imaging system 1000 according to a tenth embodiment of the present disclosure may include a first lens group LG1 and a second lens group LG2.

[0424] The first lens group LG1 may include a front lens FL and a first reflecting member P1, and the second lens group LG2 may include a first lens 1010, a second lens 1020, a third lens 1030, a fourth lens 1040 and a fifth lens 1050 arranged sequentially along the optical axis of the second lens group LG2 from the object side of the second lens group LG2 toward the image side of the second lens group LG2.

[0425] The front lens FL can be positioned in front of the first reflecting member P1.

[0426] The first reflective component P1 may include, for example: Figure 3 The incident surface PS1, the first reflecting surface R1, and the exit surface PS2 are shown in the diagram.

[0427] The optical imaging system 1000 may further include a second reflective member P2 disposed behind the second lens group LG2. The second reflective member P2 may include, for example: Figure 4 The second reflective surface R2 and the third reflective surface R3 are shown in the figure.

[0428] In addition, the optical imaging system 1000 may also include a filter IF and an imaging surface IP disposed after the second reflective member P2.

[0429] The imaging surface IP can refer to the surface on which the optical imaging system 1000 forms a focal point. For example, the imaging surface IP can refer to a surface of the image sensor IS on which light is received, such as... Figure 3 and Figure 4 As shown in the image.

[0430] An aperture stop can be positioned between the second lens 1020 and the third lens 1030. For example, the aperture stop can be positioned at the edge of the object side of the third lens 1030.

[0431] The characteristics of each element (radius of curvature, element thickness or distance between elements, refractive index, Abbe number and effective radius) are listed in Table 19 below.

[0432] Table 19

[0433] For reference, the “distance” in Table 19 can be based on the position of the second reflecting element P2 when the object distance is infinite.

[0434] In the tenth embodiment of this disclosure, the front lens FL may have positive refractive power, the paraxial region on the object side of the front lens FL may have a convex shape, and the paraxial region on the image side of the front lens FL may have a concave shape.

[0435] The first lens 1010 may have positive refractive power, and the corresponding paraxial regions of the object side and image side of the first lens 1010 may each have a convex shape.

[0436] The second lens 1020 may have negative refractive power, the paraxial region on the object side of the second lens 1020 may have a convex shape, and the paraxial region on the image side of the second lens 1020 may have a concave shape.

[0437] The third lens 1030 may have negative refractive power, and the corresponding paraxial regions of the object side and image side of the third lens 1030 may each have a concave shape.

[0438] The fourth lens 1040 may have positive refractive power, and the corresponding paraxial regions of the object side and image side of the fourth lens 1040 may each have a convex shape.

[0439] The fifth lens 1050 may have positive refractive power, and the corresponding paraxial regions of the object side and image side of the fifth lens 1050 may each have a convex shape.

[0440] The two surfaces of the front lens FL and the two surfaces of each of the first lenses 1010 to the fifth lenses 1050 may have aspherical surface coefficients as listed in Table 20 below. For example, the object-side surface and the image-side surface of the front lens FL may both be aspherical surfaces, and the object-side surface and the image-side surface of each of the first lenses 1010 to the fifth lenses 1050 may both be aspherical surfaces.

[0441] Table 20

[0442] Furthermore, the optical imaging system 1000 configured as described above may have Figure 24 The aberration characteristics shown are illustrated.

[0443] Table 21 below lists the attribute values ​​of the optical imaging systems 100 to 1000 according to the first to tenth embodiments.

[0444] Table 21

[0445] In Table 21, R1 can be the radius of curvature of the incident surface PS1 of the first reflective member P1, and R2 can be the radius of curvature of the exit surface PS2 of the first reflective member P1 (in Examples 1 to 5).

[0446] Alternatively, R1 may be the radius of curvature of the object side of the front lens FL, and R2 may be the radius of curvature of the image side of the front lens FL (in Examples 6 to 10).

[0447] f can be the total focal length of the optical imaging system, f1 can be the focal length of the first lens, f2 can be the focal length of the second lens, f3 can be the focal length of the third lens, f4 can be the focal length of the fourth lens, and f5 can be the focal length of the fifth lens.

[0448] d1 can be the distance between the first reflecting surface of the first reflecting member P1 and the object side surface of the first lens of the second lens group LG2.

[0449] h1 can be the effective radius of the first surface of the first lens group LG1 (the incident surface PS1 of the first reflecting member P1 in embodiments 1 to 5, and the object side surface of the front lens FL in embodiments 6 to 10).

[0450] h2 can be the effective radius of the object side surface of the first lens of the second lens group LG2.

[0451] a can be the distance between the center of the first reflective surface R1 of the first reflective member P1 and the center of the second reflective surface R2 of the second reflective member P2 when the object distance is infinite, and b can be the distance between the center of the second reflective surface R2 of the second reflective member P2 and the center of the third reflective surface R3 of the second reflective member P2.

[0452] Fno can be the F-number of the optical imaging system, fG1 can be the focal length of the first lens group LG1, and fG2 can be the focal length of the second lens group LG2.

[0453] Him can be half the length of the imaging surface IP in the horizontal direction. The horizontal direction can refer to the direction from the second reflecting surface R2 toward the third reflecting surface R3 (or the opposite direction).

[0454] AFd can be the amount of movement of the second reflecting member P2 between the position closest to the second lens group LG2 (when the object distance is infinite) and the position farthest from the second lens group LG2 (when the object distance is the minimum value (e.g., 300 mm)).

[0455] TTL can be the sum of the distances along the optical axis from the first surface of the first lens group LG1 to the first reflective surface R1 of the first reflective member P1, from the first reflective surface R1 of the first reflective member P1 to the second reflective surface R2 of the second reflective member P2, from the second reflective surface R2 of the second reflective member P2 to the third reflective surface R3 of the second reflective member P2, and from the third reflective surface R3 of the second reflective member P2 to the imaging surface IP.

[0456] BFL can be the sum of the distance along the optical axis from the last surface of the second lens group LG2 to the second reflecting surface R2 of the second reflecting member P2, the distance along the optical axis from the second reflecting surface R2 of the second reflecting member P2 to the third reflecting surface R3 of the second reflecting member P2, and the distance along the optical axis from the third reflecting surface R3 of the second reflecting member P2 to the imaging surface IP.

[0457] IMG HT can be half the diagonal length of the imaging plane.

[0458] fi_300 can be the value of fi when the object distance is 300mm, where fi = (object distance × f) / (object distance + f).

[0459] Table 22 below lists the values ​​of conditional expressions 1 to 46 for the optical imaging systems 100 to 1000 according to the first to tenth embodiments.

[0460] Table 22

[0461] The values ​​listed in Tables 21 and 22 can be obtained by rounding to three decimal places.

[0462] While this disclosure includes specific embodiments, it will be apparent upon understanding the disclosure of this application that various changes in form and detail may be made to these embodiments without departing from the spirit and scope of the claims and their equivalents. The description of features or aspects in each embodiment should be considered applicable to similar features or aspects in other embodiments. Suitable results may still be achieved if the described techniques are performed in a different order, and / or if components in the described system, architecture, device, or circuit are combined in different ways and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of this disclosure is not limited by the specific embodiments but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in this disclosure.

Claims

1. An optical imaging system, including: A first lens group and a second lens group with positive refractive power are arranged sequentially along the optical axis of the optical imaging system from the object side of the optical imaging system toward the imaging surface of the optical imaging system. The first lens group includes a first reflecting member, and the first reflecting member includes a first reflecting surface. The second lens group includes multiple lenses. The optical imaging system also includes a second reflective component disposed behind the second lens group. The second reflective member includes a second reflective surface and a third reflective surface, and The following condition must be met: 0.50 < fG1 / fG2 < 2.50, where fG1 is the focal length of the first lens group and fG2 is the focal length of the second lens group.

2. The optical imaging system according to claim 1, wherein, The second reflective surface is disposed behind the second lens group. The third reflective surface is spaced apart from the second reflective surface in a direction perpendicular to the optical axis of the second lens group, and The second reflective member is configured to move along the optical axis of the second lens group.

3. The optical imaging system according to claim 2, wherein, The condition 0.50 < a / f < 1.00 is satisfied, where a is the distance between the center of the first reflective surface and the center of the second reflective surface when the second reflective member is positioned closest to the second lens group, and f is the total focal length of the optical imaging system.

4. The optical imaging system according to claim 2, wherein, The condition 0.30 < a / TTL < 0.60 is satisfied, where a is the distance between the center of the first reflective surface and the center of the second reflective surface when the second reflective member is positioned closest to the second lens group, and TTL is the sum of the distances along the optical axis of the optical imaging system from the first surface of the first lens group to the first reflective surface, from the first reflective surface to the second reflective surface, from the second reflective surface to the third reflective surface, and from the third reflective surface to the imaging surface.

5. The optical imaging system according to claim 2, wherein, The condition 0.100 < AFd / (f-fi) < 0.600 is satisfied, where AFd is the distance between the position of the second reflective member located at the position closest to the second lens group and the position of the second reflective member located at the position farthest from the second lens group, f is the total focal length of the optical imaging system, and fi is (object distance × f) / (object distance + f).

6. The optical imaging system according to claim 1 further includes an image sensor, the image sensor including the imaging surface. in, The image sensor is spaced apart from the third reflective surface in a direction parallel to the optical axis of the second lens group. The second reflective surface and the third reflective surface are spaced apart from each other in a direction perpendicular to the optical axis of the second lens group, and The following conditions must be met: h2 + Him < b, where h2 is the effective radius of the object side of the first lens closest to the first lens in the plurality of lenses of the second lens group, Him is half the length of the imaging surface in the direction in which the second reflecting surface and the third reflecting surface are spaced apart from each other, and b is the distance between the center of the second reflecting surface and the center of the third reflecting surface.

7. The optical imaging system according to claim 1, wherein, The condition 0.20 < f / fG1 < 0.90 is satisfied, where f is the total focal length of the optical imaging system.

8. The optical imaging system according to claim 1, wherein, The condition 0.40 < f / fG2 < 1.10 is satisfied, where f is the total focal length of the optical imaging system.

9. The optical imaging system according to claim 1, wherein, The condition 0.10 < RG1_S1 / fG1 < 0.60 is satisfied, where RG1_S1 is the radius of curvature of the first surface of the first lens group.

10. The optical imaging system according to claim 1, wherein, The condition 0.60 < fG1 / TTL < 1.60 is satisfied, where TTL is the sum of the distances along the optical axis from the first surface of the first lens group to the first reflecting surface, from the first reflecting surface to the second reflecting surface, from the second reflecting surface to the third reflecting surface, and from the third reflecting surface to the imaging surface.

11. The optical imaging system according to claim 1, wherein, The condition 3.50 < f / h1 < 5.50 is satisfied, where f is the total focal length of the optical imaging system and h1 is the effective radius of the first surface of the first lens group.

12. The optical imaging system according to claim 1, wherein, The following condition is satisfied: 0.40 < h2 / h1 < 0.80, where h1 is the effective radius of the first surface of the first lens group, and h2 is the effective radius of the object side surface of the first lens closest to the first lens group among the plurality of lenses of the second lens group.

13. The optical imaging system according to claim 1, wherein, The condition is satisfied that 0.40 < BFL / TTL < 0.70, where BFL is the sum of the distances along the optical axis from the last surface of the second lens group to the second reflecting surface, from the second reflecting surface to the third reflecting surface, and from the third reflecting surface to the imaging surface, and TTL is the sum of the distances along the optical axis from the first surface of the first lens group to the first reflecting surface, from the first reflecting surface to the second reflecting surface, from the second reflecting surface to the third reflecting surface, and from the third reflecting surface to the imaging surface.

14. The optical imaging system according to claim 1, wherein, The first reflective member further includes an incident surface and an exit surface, and The paraxial region of the incident surface has a convex shape.

15. The optical imaging system according to claim 1, wherein, The first lens group further includes a front lens disposed in front of the first reflecting member, and The front lens has positive refractive power.

16. The optical imaging system according to claim 1, wherein, The plurality of lenses in the second lens group include: A first lens with positive refractive power; A second lens with refractive power; A third lens with negative refractive power; A fourth lens with refractive power; and A fifth lens with positive refractive power, and The first lens to the fifth lens are arranged sequentially along the optical axis of the second lens group from the object side of the second lens group toward the image side of the second lens group.

17. The optical imaging system according to claim 16, wherein, The second lens has negative refractive power, and the fourth lens has positive refractive power.

18. The optical imaging system of claim 1, further comprising an image sensor, the image sensor including the imaging surface, in, The image sensor is spaced apart from the third reflective surface in a direction parallel to the optical axis of the second lens group. The second reflective surface and the third reflective surface are spaced apart from each other in a direction perpendicular to the optical axis of the second lens group, and The condition 0.50 < (h2+Him) / b < 0.80 is satisfied, where h2 is the effective radius of the object side of the first lens closest to the first lens in the plurality of lenses of the second lens group, Him is half the length of the imaging surface in the direction that the second reflecting surface and the third reflecting surface are spaced apart from each other, and b is the distance between the center of the second reflecting surface and the center of the third reflecting surface.

19. The optical imaging system according to claim 1, wherein, The condition 0.15 < |(RG1_S1-RG1_S2) / (RG1_S1+RG1_S2)| < 0.60 is satisfied, where RG1_S1 is the radius of curvature of the first surface of the first lens group, and RG1_S2 is the radius of curvature of the last surface of the first lens group.

20. The optical imaging system according to claim 1, wherein, The condition 0 < h2 / fG1 < 0.1 is satisfied, where h2 is the effective radius of the object side surface of the first lens closest to the first lens in the second lens group.

21. The optical imaging system according to claim 1, wherein, The following condition is satisfied: 7.0 < TTL / (2×IMG HT) < 11.0, where TTL is the sum of the distances along the optical axis from the first surface of the first lens group to the first reflecting surface, from the first reflecting surface to the second reflecting surface, from the second reflecting surface to the third reflecting surface, and from the third reflecting surface to the imaging surface, and IMG HT is half the diagonal length of the imaging surface.

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