Optical imaging system

Abstract

An optical imaging system includes a first lens group including a first lens and a second lens disposed in order along a first optical axis, a second lens group including a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens disposed in order along a second optical axis perpendicular to the first optical axis, and a light path conversion member disposed between the first lens group and the second lens group, the light path conversion member being configured to change a traveling direction of light from a direction of the first optical axis to a direction of the second optical axis, wherein a conditional expression 0.5 ≤ |f / f1| + |f / f2| ≤ 1.5 is satisfied, where f is a focal length of the optical imaging system, f1 is a focal length of the first lens, and f2 is a focal length of the second lens.

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0180902, filed on December 6, 2024, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. Technical Field

[0003] This disclosure relates to an optical imaging system for a telephoto camera. Background Technology

[0004] In the recent mobile camera market, there has been an increased demand for slim, high-magnification telephoto cameras.

[0005] Since high-magnification telephoto cameras require long focal lengths, prisms used to bend the path of light can be placed in front of the lens of the high-magnification telephoto camera.

[0006] In addition, in order to realize a telephoto camera with high magnification and low F number, a folding optics type has been proposed, in which a large-diameter lens is set horizontally in front of a prism.

[0007] However, when only one lens is placed in front of the prism, there are limitations in aberration correction and thinning of high-magnification telephoto cameras. Summary of the Invention

[0008] 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.

[0009] In one general aspect, the optical imaging system includes: a first lens group comprising a first lens and a second lens arranged sequentially along a first optical axis from the object side of the first lens group toward the image side of the first lens group; a second lens group comprising a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially along a second optical axis perpendicular to the first optical axis from the object side of the second lens group toward the imaging surface of the optical imaging system; and a light path conversion member disposed between the first lens group and the second lens group, the light path conversion member being configured to change the direction of light travel from the direction of the first optical axis to the direction of the second optical axis, wherein the condition 0.5 ≤ |f / f1| + |f / f2| ≤ 1.5 is satisfied, where f is the focal length of the optical imaging system, f1 is the focal length of the first lens, and f2 is the focal length of the second lens.

[0010] The first and second lenses can have refractive powers with opposite signs.

[0011] It can satisfy the conditional expression 1 ≤ fG1 / f ≤ 3, where fG1 is the focal length of the first lens group.

[0012] It can satisfy the conditional expression 2 ≤ f3 / f4 ≤ -1, where f3 is the focal length of the third lens and f4 is the focal length of the fourth lens.

[0013] The condition 1.0 ≤ (F number × SD1) / f ≤ 3.0 can be satisfied, where SD1 is the diameter of the first lens and the F number is the value representing the brightness of the optical imaging system.

[0014] It can satisfy the conditional expression 1.5 ≤ f / BFL ≤ 3.0, where BFL is the distance along the second optical axis from the image side of the seventh lens to the imaging plane.

[0015] The third lens can have positive refractive power, the fourth lens can have negative refractive power, the fifth lens can have positive refractive power, the sixth lens can have negative refractive power, and the seventh lens can have positive refractive power.

[0016] The object-side surface of the third lens may have a convex shape in its paraxial region, and the image-side surface of the fourth lens may have a concave shape in its paraxial region.

[0017] The first lens may have positive refractive power, and the image-side surface of the first lens may have a convex shape in its paraxial region.

[0018] The first lens may have negative refractive power, and the image-side surface of the first lens may have a concave shape in its paraxial region.

[0019] The second lens can have negative refractive power, and the image side of the second lens can have a concave shape in its paraxial region.

[0020] The second lens can have negative refractive power, and the image side of the second lens can have a convex shape in its paraxial region.

[0021] The second lens can have positive refractive power, and the image side of the second lens can have a convex shape in its paraxial region.

[0022] The object-side and image-side of the sixth lens can both have a concave shape in their respective paraxial regions.

[0023] The image-side surface of the fifth lens may have a convex shape in its paraxial region, and the object-side surface of the seventh lens may have a convex shape in its paraxial region.

[0024] In another general aspect, the optical imaging system includes: a light path conversion member configured to change the path of light passing through the optical imaging system; a first lens group disposed on the object side of the light path conversion member, the first lens group including a plurality of lenses arranged sequentially along a first optical axis; and a second lens group disposed on the image side of the light path conversion member, the second lens group including a plurality of lenses arranged sequentially along a second optical axis perpendicular to the first optical axis, wherein the total number of lenses in the second lens group is greater than the total number of lenses in the first lens group, and satisfies the condition 1.0 ≤ fG2 / dG1G2 ≤ 4.5, where fG2 is the focal length of the second lens group, and dG1G2 is the distance between the first lens group and the second lens group along the first and second optical axes.

[0025] The first lens group may include a first lens and a second lens arranged sequentially along the first optical axis from the object side of the first lens group toward the optical path conversion component. The second lens group may include a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially along the second optical axis from the object side of the second lens group toward the imaging surface of the optical imaging system. The second lens group may satisfy the conditional expression -2 ≤ f3 / f4 ≤ -1, where f3 is the focal length of the third lens and f4 is the focal length of the fourth lens.

[0026] The first and second lenses can have refractive powers with opposite signs, the third, fifth and seventh lenses can have positive refractive powers, and the fourth and sixth lenses can have negative refractive powers.

[0027] The conditional expression can be satisfied. / mm ≤ FOV / IMG HT ≤ / mm, where FOV is the field of view of the optical imaging system, and IMG HT is half the diagonal length of the imaging surface of the optical imaging system.

[0028] It can satisfy the conditional expression 1.5 ≤ h1 / h2 ≤ 3, where h1 is the maximum height of the optical imaging system along the first optical axis, and h2 is the maximum height of the second lens group along the first optical axis.

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

[0030] Figure 1A This is a configuration diagram showing an optical imaging system according to a first embodiment of the present disclosure.

[0031] Figure 1B This is a graph showing the aberration characteristics of an optical imaging system according to a first embodiment of the present disclosure.

[0032] Figure 2A This is a configuration diagram showing an optical imaging system according to a second embodiment of the present disclosure.

[0033] Figure 2B This is a graph showing the aberration characteristics of an optical imaging system according to a second embodiment of the present disclosure.

[0034] Figure 3A This is a configuration diagram showing an optical imaging system according to a third embodiment of the present disclosure.

[0035] Figure 3B This is a graph showing the aberration characteristics of an optical imaging system according to a third embodiment of the present disclosure.

[0036] Figure 4A This is a configuration diagram showing an optical imaging system according to a fourth embodiment of the present disclosure.

[0037] Figure 4B This is a graph showing the aberration characteristics of an optical imaging system according to a fourth embodiment of the present disclosure.

[0038] Figure 5A This is a configuration diagram showing an optical imaging system according to a fifth embodiment of the present disclosure.

[0039] Figure 5B This is a graph showing the aberration characteristics of an optical imaging system according to a fifth embodiment of the present disclosure.

[0040] Figure 6A This is a configuration diagram showing an optical imaging system according to a sixth embodiment of the present disclosure.

[0041] Figure 6B This is a graph showing the aberration characteristics of an optical imaging system according to a sixth embodiment of the present disclosure.

[0042] Figure 7A This is a configuration diagram showing an optical imaging system according to a seventh embodiment of the present disclosure.

[0043] Figure 7B This is a graph showing the aberration characteristics of an optical imaging system according to a seventh embodiment of the present disclosure.

[0044] Figure 8A This is a configuration diagram showing an optical imaging system according to an eighth embodiment of the present disclosure.

[0045] Figure 8B This is a graph showing the aberration characteristics of an optical imaging system according to an eighth embodiment of the present disclosure.

[0046] 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

[0047] 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.

[0048] 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, apparatuses, and / or systems described herein will become apparent upon understanding the disclosure of this application.

[0049] 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.

[0050] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more items.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] In the optical imaging system configuration diagrams in the accompanying drawings, the thickness, size, and shape of the lenses may be exaggerated for clarity. Specifically, the aspherical shapes of the lens surfaces shown in the configuration diagrams are presented as examples only and are not limited thereto.

[0055] As used herein, the first lens may refer to the lens positioned closest to the object side of the optical imaging system, and the seventh lens may refer to the lens positioned closest to the imaging surface of the optical imaging system (or image sensor).

[0056] Furthermore, as used herein, the units for radii of curvature, thickness, distance, focal length, and other dimensions are millimeters (mm), and the units for field of view (FOV) are degrees (°).

[0057] Furthermore, in the description of a lens shape, the statement that the lens surface has a convex shape means that the paraxial region of that surface is convex, and the statement that the lens surface has a concave shape means that the paraxial region of that surface is concave. Therefore, even when the lens surface is described as having a convex shape, the edge portion of the lens can be concave. Similarly, even when the lens surface is described as having a concave shape, the edge portion of the lens can be convex.

[0058] The paraxial region of a lens surface is a very narrow area on the lens surface that is close to the optical axis.

[0059] 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 the paraxial region of the lens surface, the 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.

[0060] An optical imaging system according to an embodiment of the present disclosure may include seven lenses. For example, an optical imaging system according to an embodiment of the present disclosure may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens 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.

[0061] However, the optical imaging system according to embodiments of this disclosure may include more than seven lenses and may further include other components as needed.

[0062] The optical imaging system according to embodiments of the present disclosure may further include an image sensor for converting incident light from an object into an electrical signal.

[0063] Furthermore, the optical imaging system according to embodiments of the present disclosure may also include an infrared blocking filter (hereinafter referred to as a filter) that blocks infrared light in the wavelength range incident on the image sensor.

[0064] Furthermore, the optical imaging system according to embodiments of this disclosure may also include a light path conversion member for changing the path of incident light toward an image sensor. For example, the light path conversion member may be configured as a prism or mirror having a reflective surface.

[0065] Furthermore, the optical imaging system according to embodiments of this disclosure may also include an aperture stop for adjusting the amount of light passing through the optical imaging system. For example, the aperture stop may be disposed between two adjacent lenses.

[0066] An optical imaging system according to embodiments of the present disclosure may include lenses made of plastic material. For example, the first through seventh lenses may all be lenses made of plastic material.

[0067] Furthermore, at least one of the first to seventh lenses may have an aspherical surface. For example, each of the first to seventh lenses may have at least one aspherical surface. The aspherical surfaces of the first to seventh lenses are defined by Equation 1 below.

[0068] (Equation 1)

[0069] 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 to H, J, and L to P 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.

[0070] An optical imaging system according to an embodiment of the present disclosure may include two lens groups. For example, an optical imaging system according to an embodiment of the present disclosure may include a first lens group and a second lens group 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.

[0071] The first lens group and the second lens group may each include multiple lenses arranged along different optical axes. For example, the first lens group may include a first lens and a second lens arranged sequentially along a first optical axis, and the second lens group may include a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially along a second optical axis. The first optical axis and the second optical axis may be perpendicular to each other or substantially perpendicular to each other.

[0072] The optical path conversion component can be disposed between the first lens group and the second lens group. For example, the optical path conversion component can change the path of the incident light from the direction of the first optical axis to the direction of the second optical axis.

[0073] The first lens group may include lenses with opposite refractive powers. That is, the refractive powers of the first lens and the second lens may be opposite to each other. For example, the first lens may have positive refractive power and the second lens may have negative refractive power. Alternatively, the first lens may have negative refractive power and the second lens may have positive refractive power.

[0074] In the second lens group, lenses with opposite refractive powers can be alternately arranged along the optical axis. That is, the refractive powers of two adjacent lenses can be opposite to each other. For example, the third lens can have positive refractive power, the fourth lens can have negative refractive power, the fifth lens can have positive refractive power, the sixth lens can have negative refractive power, and the seventh lens can have positive refractive power.

[0075] According to embodiments of this disclosure, the first lens group and the second lens group may each include multiple lenses, and adjacent lenses may have opposite refractive powers, thereby improving the aberration correction performance of the optical imaging system. Furthermore, the first lens group may include multiple lenses, thereby reducing the F-number while minimizing the increase in height of the telephoto camera module comprising the optical imaging system.

[0076] The optical imaging system according to embodiments of the present disclosure may satisfy any one or any combination of any two or more of the following conditional expressions 1 to 8.

[0077] 0.5 ≤ |f / f1| + |f / f2| ≤ 1.5 (Conditional expression 1)

[0078] -2 ≤ f3 / f4 ≤ -1 (Conditional expression 2)

[0079] 1 ≤ fG1 / f ≤ 3 (Conditional expression 3)

[0080] 5 / mm ≤ FOV / IMG HT ≤ 9 / mm (Conditional expression 4)

[0081] 1.0 ≤ fG2 / dG1G2 ≤ 4.5 (Conditional expression 5)

[0082] 1.5 ≤ h1 / h2 ≤ 3.0 (Conditional expression 6)

[0083] 1.5 ≤ f / BFL ≤ 3.0 (Conditional expression 7)

[0084] 1.0 ≤ (F number × SD1) / f ≤ 3.0 (Conditional expression 8)

[0085] In conditional expression 1, f is the focal length of the optical imaging system, f1 is the focal length of the first lens, and f2 is the focal length of the second lens. Conditional expression 1 relates to the refractive power conditions (the reciprocal of the focal length) of the first and second lenses, used to reduce aberrations in the optical imaging system.

[0086] In conditional expression 2, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens. Conditional expression 2 relates to the refractive power conditions (the reciprocal of the focal length) of the third and fourth lenses, used to reduce aberrations in the optical imaging system.

[0087] In conditional expression 3, f is the focal length of the optical imaging system, and fG1 is the focal length of the first lens group (or the combined focal length of the first and second lenses). Conditional expression 3 relates to the refractive power condition of the first lens group (the reciprocal of the focal length) to reduce the size of the second lens group.

[0088] In conditional expression 4, FOV is the field of view of the optical imaging system, and IMG HT is half the diagonal length of the imaging plane. Conditional expression 4 can represent the field of view of the lens.

[0089] In conditional expression 5, fG2 is the focal length of the second lens group (or the composite focal length of the third, fourth, fifth, sixth, and seventh lenses), and dG1G2 is the distance along the optical axis between the first and second lens groups (or the sum of the distance along the first optical axis from the image-side surface of the second lens to the reflecting surface of the optical path conversion member and the distance along the second optical axis from the reflecting surface of the optical path conversion member to the object-side surface of the third lens). Conditional expression 5 relates to the leading lens effect of the first lens group. When the range of conditional expression 5 is satisfied, it is considered that the goal of minimizing the increase in height of the telephoto camera module, including the optical imaging system, has been achieved.

[0090] In conditional expression 6, h1 is the maximum height of the optical imaging system along the first optical axis, and h2 is the maximum height of the second lens group along the first optical axis. The direction of the first optical axis corresponds to the height direction of the telephoto camera module including the optical imaging system. Conditional expression 6 relates to the leading lens effect of the first lens group. When the range of conditional expression 6 is satisfied, it is considered that the goal of minimizing the increase in height of the telephoto camera module including the optical imaging system has been achieved.

[0091] In conditional expression 7, f is the focal length of the optical imaging system, and BFL is the distance along the optical axis from the image-side surface of the seventh lens to the imaging plane. Conditional expression 7 relates to the characteristics of telephoto cameras.

[0092] In conditional expression 8, SD1 is the diameter of the first lens, and the F-number is a value representing the brightness of the optical imaging system, which is equal to the focal length of the optical imaging system divided by the diameter of the entrance pupil of the optical imaging system. Conditional expression 8 can represent the relationship between the diameter of the first lens and the F-number in a front-lens type optical system.

[0093] The optical imaging system according to embodiments of this disclosure may also satisfy any one or any combination of any two or more of the following conditional expressions 9 to 15.

[0094] -0.5 ≤ f / f1 ≤ 1.0 (Conditional expression 9)

[0095] -0.5 ≤ f / f2 ≤ 1.0 (Conditional expression 10)

[0096] 1 ≤ f / f3 ≤ 3 (Conditional expression 11)

[0097] -5 < f / f4 ≤ -1 (Conditional expression 12)

[0098] 2 ≤ f / f5 < 5 (Conditional expression 13)

[0099] -10 ≤ f / f6 < 0 (Conditional expression 14)

[0100] 1 ≤ f / f7 < 3 (Conditional expression 15)

[0101] In conditional expressions 9 through 15, f is the focal length of the optical imaging system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens. When the range of conditional expressions 9 through 15 is satisfied, each lens can have appropriate refractive power, thereby providing acceptable aberration characteristics.

[0102] First Embodiment

[0103] Figure 1A This is a configuration diagram showing an optical imaging system according to a first embodiment of the present disclosure. Figure 1B This is a graph showing the aberration characteristics of an optical imaging system according to a first embodiment of the present disclosure.

[0104] Reference Figure 1A The optical imaging system 100 according to a first embodiment of this disclosure may include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, and a seventh lens 170 arranged sequentially along the optical axis of the optical imaging system 100 from the object side of the optical imaging system 100 toward the imaging surface IP of the optical imaging system 100. Furthermore, a filter F and an image sensor IS having the imaging surface IP may be disposed on the image side of the seventh lens 170. Additionally, although not shown in the figures, an aperture stop may be disposed between the fifth lens 150 and the sixth lens 160.

[0105] The optical imaging system 100 according to the first embodiment of this disclosure may include a first lens group LG1 and a second lens group LG2, and the optical path conversion member P may be disposed between the first lens group LG1 and the second lens group LG2. That is, the first lens group LG1 and the second lens group LG2 may have different optical axes.

[0106] According to a first embodiment of this disclosure, the first lens group LG1 may include a first lens 110 and a second lens 120 arranged sequentially along the first optical axis OA1. The second lens group LG2 may include a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, and a seventh lens 170 arranged sequentially along the second optical axis OA2. The optical path conversion member P can change the path of the incident light from the direction of the first optical axis OA1 to the direction of the second optical axis OA2.

[0107] exist Figure 1A In the diagram, h1 is the maximum height of the optical imaging system 100 along the first optical axis OA1, and h2 is the maximum height of the second lens group LG2 along the first optical axis OA1. The direction of the first optical axis OA1 corresponds to the height direction of the telephoto camera module including the optical imaging system 100. Although in Figure 2A , Figure 3A , Figure 4A , Figure 5A , Figure 6A , Figure 7A and Figure 8A Dimensions h1 and h2 are not shown in the figure, but they can be applied to these figures as well.

[0108] The characteristics of the lenses included in the optical imaging system 100 according to the first embodiment of the present disclosure are listed in Table 1 below.

[0109] Table 1

[0110] According to a first embodiment of this disclosure, a first lens 110 may have positive refractive power, and both the object-side and image-side surfaces of the first lens 110 may have a convex shape in their respective paraxial regions. A second lens 120 may have negative refractive power, and both the object-side and image-side surfaces of the second lens 120 may have a convex shape in their respective paraxial regions. A third lens 130 may have positive refractive power, and both the object-side and image-side surfaces of the third lens 130 may have a convex shape in their respective paraxial regions. A fourth lens 140 may have negative refractive power, and both the object-side and image-side surfaces of the fourth lens 140 may have a concave shape in their respective paraxial regions. A fifth lens 150 may have positive refractive power, and both the object-side and image-side surfaces of the fifth lens 150 may have a concave shape in their respective paraxial regions. The sixth lens 160 may have negative refractive power, and both the object-side and image-side surfaces of the sixth lens 160 may have concave shapes in their respective paraxial regions. The seventh lens 170 may have positive refractive power, and both the object-side and image-side surfaces of the seventh lens 170 may have convex shapes in their respective paraxial regions.

[0111] The aspherical coefficients K, A to H, J, and L to P of the lenses included in the optical imaging system 100 according to the first embodiment of this disclosure, according to Formula 1 discussed above, are listed in Table 2 below. According to the first embodiment, the object-side surface and image-side surface of each of the first lens 110 to the seventh lens 170 can be aspherical surfaces.

[0112] Table 2

[0113] Second Embodiment

[0114] Figure 2A This is a configuration diagram showing an optical imaging system according to a second embodiment of the present disclosure. Figure 2B This is a graph showing the aberration characteristics of an optical imaging system according to a second embodiment of the present disclosure.

[0115] Reference Figure 2A The optical imaging system 200 according to a second embodiment of this disclosure may include a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, a sixth lens 260, and a seventh lens 270 arranged sequentially along the optical axis of the optical imaging system 200 from the object side of the optical imaging system 200 toward the imaging surface IP of the optical imaging system 200. Furthermore, a filter F and an image sensor IS having the imaging surface IP may be disposed on the image side of the seventh lens 270. Additionally, although not shown in the figures, an aperture stop may be disposed between the fifth lens 250 and the sixth lens 260.

[0116] The optical imaging system 200 according to the second embodiment of this disclosure may include a first lens group LG1 and a second lens group LG2, and the optical path conversion member P may be disposed between the first lens group LG1 and the second lens group LG2. That is, the first lens group LG1 and the second lens group LG2 may have different optical axes.

[0117] According to a second embodiment of this disclosure, the first lens group LG1 may include a first lens 210 and a second lens 220 arranged sequentially along the first optical axis OA1. The second lens group LG2 may include a third lens 230, a fourth lens 240, a fifth lens 250, a sixth lens 260, and a seventh lens 270 arranged sequentially along the second optical axis OA2. The optical path conversion member P can change the path of the incident light from the direction of the first optical axis OA1 to the direction of the second optical axis OA2.

[0118] The characteristics of the lenses included in the optical imaging system 200 according to the second embodiment of the present disclosure are listed in Table 3 below.

[0119] Table 3

[0120] According to a second embodiment of this disclosure, the first lens 210 may have positive refractive power, and both the object-side and image-side surfaces of the first lens 210 may have convex shapes in their respective paraxial regions. The second lens 220 may have negative refractive power, and both the object-side and image-side surfaces of the second lens 220 may have convex shapes in their paraxial regions and concave shapes in their paraxial regions. The third lens 230 may have positive refractive power, and both the object-side and image-side surfaces of the third lens 230 may have convex shapes in their paraxial regions and concave shapes in their paraxial regions. The fourth lens 240 may have negative refractive power, and both the object-side and image-side surfaces of the fourth lens 240 may have convex shapes in their paraxial regions and concave shapes in their paraxial regions. The fifth lens 250 may have positive refractive power, and both the object-side and image-side surfaces of the fifth lens 250 may have convex shapes in their respective paraxial regions. The sixth lens 260 may have negative refractive power, and both the object-side and image-side surfaces of the sixth lens 260 may have concave shapes in their respective paraxial regions. The seventh lens 270 may have positive refractive power, and both the object-side and image-side surfaces of the seventh lens 270 may have convex shapes in their respective paraxial regions.

[0121] The aspherical coefficients K, A to H, J, and L to P of the lenses included in the optical imaging system 200 according to the second embodiment of this disclosure, as discussed in Equation 1 above, are listed in Table 4 below. According to the second embodiment, the object-side surface and image-side surface of each of the first lens 210 to the seventh lens 270 can be aspherical surfaces.

[0122] Table 4

[0123] Third Embodiment

[0124] Figure 3A This is a configuration diagram showing an optical imaging system according to a third embodiment of the present disclosure. Figure 3B This is a graph showing the aberration characteristics of an optical imaging system according to a third embodiment of the present disclosure.

[0125] Reference Figure 3AThe optical imaging system 300 according to the third embodiment of this disclosure may include a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, a sixth lens 360, and a seventh lens 370 arranged sequentially along the optical axis of the optical imaging system 300 from the object side of the optical imaging system 300 toward the imaging surface IP of the optical imaging system 300. Furthermore, a filter F and an image sensor IS having the imaging surface IP may be disposed on the image side of the seventh lens 370. Additionally, although not shown in the figures, an aperture stop may be disposed between the fifth lens 350 and the sixth lens 360.

[0126] The optical imaging system 300 according to the third embodiment of this disclosure may include a first lens group LG1 and a second lens group LG2, and the optical path conversion member P may be disposed between the first lens group LG1 and the second lens group LG2. That is, the first lens group LG1 and the second lens group LG2 may have different optical axes.

[0127] According to a third embodiment of this disclosure, the first lens group LG1 may include a first lens 310 and a second lens 320 arranged sequentially along the first optical axis OA1. The second lens group LG2 may include a third lens 330, a fourth lens 340, a fifth lens 350, a sixth lens 360, and a seventh lens 370 arranged sequentially along the second optical axis OA2. The optical path conversion member P can change the path of the incident light from the direction of the first optical axis OA1 to the direction of the second optical axis OA2.

[0128] The characteristics of the lenses included in the optical imaging system 300 according to the third embodiment of the present disclosure are listed in Table 5 below.

[0129] Table 5

[0130] According to a third embodiment of this disclosure, the first lens 310 may have positive refractive power, and both the object-side and image-side surfaces of the first lens 310 may have convex shapes in their respective paraxial regions. The second lens 320 may have negative refractive power, and both the object-side and image-side surfaces of the second lens 320 may have convex shapes in their respective paraxial regions. The third lens 330 may have positive refractive power, and both the object-side and image-side surfaces of the third lens 330 may have convex shapes in their respective paraxial regions. The fourth lens 340 may have negative refractive power, and both the object-side and image-side surfaces of the fourth lens 340 may have concave shapes in their respective paraxial regions. The fifth lens 350 may have positive refractive power, and both the object-side and image-side surfaces of the fifth lens 350 may have concave shapes in their respective paraxial regions. The sixth lens 360 may have negative refractive power, and both the object-side and image-side surfaces of the sixth lens 360 may have concave shapes in their respective paraxial regions. The seventh lens 370 may have positive refractive power, and both the object-side and image-side surfaces of the seventh lens 370 may have convex shapes in their respective paraxial regions.

[0131] The aspherical coefficients K, A to H, J, and L to P of the lenses included in the optical imaging system 300 according to the third embodiment of this disclosure, according to Formula 1 discussed above, are listed in Table 6 below. According to the third embodiment, the object-side surface and image-side surface of each of the first lens 310 to the seventh lens 370 can be aspherical surfaces.

[0132] Table 6

[0133] Fourth embodiment

[0134] Figure 4A This is a configuration diagram showing an optical imaging system according to a fourth embodiment of the present disclosure. Figure 4B This is a graph showing the aberration characteristics of an optical imaging system according to a fourth embodiment of the present disclosure.

[0135] Reference Figure 4AThe optical imaging system 400 according to the fourth embodiment of this disclosure may include a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, a sixth lens 460, and a seventh lens 470 arranged sequentially along the optical axis of the optical imaging system 400 from the object side of the optical imaging system 400 toward the imaging surface IP of the optical imaging system 400. Furthermore, a filter F and an image sensor IS having the imaging surface IP may be disposed on the image side of the seventh lens 470. Additionally, although not shown in the figures, an aperture stop may be disposed between the fifth lens 450 and the sixth lens 460.

[0136] The optical imaging system 400 according to the fourth embodiment of this disclosure may include a first lens group LG1 and a second lens group LG2, and the optical path conversion member P may be disposed between the first lens group LG1 and the second lens group LG2. That is, the first lens group LG1 and the second lens group LG2 may have different optical axes.

[0137] According to a fourth embodiment of this disclosure, the first lens group LG1 may include a first lens 410 and a second lens 420 arranged sequentially along the first optical axis OA1. The second lens group LG2 may include a third lens 430, a fourth lens 440, a fifth lens 450, a sixth lens 460, and a seventh lens 470 arranged sequentially along the second optical axis OA2. The optical path conversion member P can change the path of the incident light from the direction of the first optical axis OA1 to the direction of the second optical axis OA2.

[0138] The characteristics of the lenses included in the optical imaging system 400 according to the fourth embodiment of the present disclosure are listed in Table 7 below.

[0139] Table 7

[0140] According to a fourth embodiment of this disclosure, the first lens 410 may have positive refractive power, and both the object-side and image-side surfaces of the first lens 410 may have a convex shape in their respective paraxial regions. The second lens 420 may have negative refractive power, and both the object-side and image-side surfaces of the second lens 420 may have a convex shape in their respective paraxial regions. The third lens 430 may have positive refractive power, and both the object-side and image-side surfaces of the third lens 430 may have a convex shape in their respective paraxial regions. The fourth lens 440 may have negative refractive power, and both the object-side and image-side surfaces of the fourth lens 440 may have a concave shape in their respective paraxial regions. The fifth lens 450 may have positive refractive power, and both the object-side and image-side surfaces of the fifth lens 450 may have a concave shape in their respective paraxial regions. The sixth lens 460 may have negative refractive power, and both the object-side and image-side surfaces of the sixth lens 460 may have concave shapes in their respective paraxial regions. The seventh lens 470 may have positive refractive power, and both the object-side and image-side surfaces of the seventh lens 470 may have convex shapes in their respective paraxial regions.

[0141] The aspherical coefficients K, A to H, J, and L to P of the lenses included in the optical imaging system 400 according to the fourth embodiment of this disclosure, according to Formula 1 discussed above, are listed in Table 8 below. According to the fourth embodiment, the object-side surface and image-side surface of each of the first lens 410 to the seventh lens 470 can be aspherical surfaces.

[0142] Table 8

[0143] Fifth Embodiment

[0144] Figure 5A This is a configuration diagram showing an optical imaging system according to a fifth embodiment of the present disclosure. Figure 5B This is a graph showing the aberration characteristics of an optical imaging system according to a fifth embodiment of the present disclosure.

[0145] Reference Figure 5AThe optical imaging system 500 according to the fifth embodiment of this disclosure may include a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, a sixth lens 560, and a seventh lens 570 arranged sequentially along the optical axis of the optical imaging system 500 from the object side of the optical imaging system 500 toward the imaging surface IP of the optical imaging system 500. Furthermore, a filter F and an image sensor IS having the imaging surface IP may be disposed on the image side of the seventh lens 570. Additionally, although not shown in the figures, an aperture stop may be disposed between the fifth lens 550 and the sixth lens 560.

[0146] The optical imaging system 500 according to the fifth embodiment of this disclosure may include a first lens group LG1 and a second lens group LG2, and the optical path conversion member P may be disposed between the first lens group LG1 and the second lens group LG2. That is, the first lens group LG1 and the second lens group LG2 may have different optical axes.

[0147] According to a fifth embodiment of this disclosure, the first lens group LG1 may include a first lens 510 and a second lens 520 arranged sequentially along the first optical axis OA1. The second lens group LG2 may include a third lens 530, a fourth lens 540, a fifth lens 550, a sixth lens 560, and a seventh lens 570 arranged sequentially along the second optical axis OA2. The optical path conversion member P can change the path of the incident light from the direction of the first optical axis OA1 to the direction of the second optical axis OA2.

[0148] The characteristics of the lenses included in the optical imaging system 500 according to the fifth embodiment of the present disclosure are listed in Table 9 below.

[0149] Table 9

[0150] According to a fifth embodiment of this disclosure, the first lens 510 may have negative refractive power, the object-side surface of the first lens 510 may have a convex shape in its paraxial region, and the image-side surface of the first lens 510 may have a concave shape in its paraxial region. The second lens 520 may have positive refractive power, and both the object-side and image-side surfaces of the second lens 520 may have convex shapes in their respective paraxial regions. The third lens 530 may have positive refractive power, the object-side surface of the third lens 530 may have a convex shape in its paraxial region, and the image-side surface of the third lens 530 may have a concave shape in its paraxial region. The fourth lens 540 may have negative refractive power, the object-side surface of the fourth lens 540 may have a convex shape in its paraxial region, and the image-side surface of the fourth lens 540 may have a concave shape in its paraxial region. The fifth lens 550 may have positive refractive power, and both the object-side and image-side surfaces of the fifth lens 550 may have convex shapes in their respective paraxial regions. The sixth lens 560 may have negative refractive power, and both the object-side and image-side surfaces of the sixth lens 560 may have concave shapes in their respective paraxial regions. The seventh lens 570 may have positive refractive power, and both the object-side and image-side surfaces of the seventh lens 570 may have convex shapes in their respective paraxial regions.

[0151] The aspherical coefficients K, A to H, J, and L to P of the lenses included in the optical imaging system 500 according to the fifth embodiment of this disclosure, as discussed in Equation 1 above, are listed in Table 10 below. According to the fifth embodiment, the object-side surface and image-side surface of each of the first lens 510 to the seventh lens 570 can be aspherical surfaces.

[0152] Table 10

[0153] Sixth Embodiment

[0154] Figure 6A This is a configuration diagram showing an optical imaging system according to a sixth embodiment of the present disclosure. Figure 6B This is a graph showing the aberration characteristics of an optical imaging system according to a sixth embodiment of the present disclosure.

[0155] Reference Figure 6AThe optical imaging system 600 according to the sixth embodiment of this disclosure may include a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, a fifth lens 650, a sixth lens 660, and a seventh lens 670 arranged sequentially along the optical axis of the optical imaging system 600 from the object side of the optical imaging system 600 toward the imaging surface IP of the optical imaging system 600. Furthermore, a filter F and an image sensor IS having the imaging surface IP may be disposed on the image side of the seventh lens 670. Additionally, although not shown in the figures, an aperture stop may be disposed between the fifth lens 650 and the sixth lens 660.

[0156] The optical imaging system 600 according to the sixth embodiment of this disclosure may include a first lens group LG1 and a second lens group LG2, and the optical path conversion member P may be disposed between the first lens group LG1 and the second lens group LG2. That is, the first lens group LG1 and the second lens group LG2 may have different optical axes.

[0157] According to a sixth embodiment of this disclosure, the first lens group LG1 may include a first lens 610 and a second lens 620 arranged sequentially along the first optical axis OA1. The second lens group LG2 may include a third lens 630, a fourth lens 640, a fifth lens 650, a sixth lens 660, and a seventh lens 670 arranged sequentially along the second optical axis OA2. The optical path conversion member P can change the path of the incident light from the direction of the first optical axis OA1 to the direction of the second optical axis OA2.

[0158] The characteristics of the lenses included in the optical imaging system 600 according to the sixth embodiment of the present disclosure are listed in Table 11 below.

[0159] Table 11

[0160] According to a sixth embodiment of this disclosure, the first lens 610 may have negative refractive power, the object-side surface of the first lens 610 may have a convex shape in its paraxial region, and the image-side surface of the first lens 610 may have a concave shape in its paraxial region. The second lens 620 may have positive refractive power, and both the object-side and image-side surfaces of the second lens 620 may have convex shapes in their respective paraxial regions. The third lens 630 may have positive refractive power, the object-side surface of the third lens 630 may have a convex shape in its paraxial region, and the image-side surface of the third lens 630 may have a concave shape in its paraxial region. The fourth lens 640 may have negative refractive power, the object-side surface of the fourth lens 640 may have a convex shape in its paraxial region, and the image-side surface of the fourth lens 640 may have a concave shape in its paraxial region. The fifth lens 650 may have positive refractive power, and both the object-side and image-side surfaces of the fifth lens 650 may have convex shapes in their respective paraxial regions. The sixth lens 660 may have negative refractive power, and both the object-side and image-side surfaces of the sixth lens 660 may have concave shapes in their respective paraxial regions. The seventh lens 670 may have positive refractive power, and both the object-side and image-side surfaces of the seventh lens 670 may have convex shapes in their paraxial regions.

[0161] The aspherical coefficients K, A to H, J, and L to P of the lenses included in the optical imaging system 600 according to the sixth embodiment of this disclosure, according to Formula 1 discussed above, are listed in Table 12 below. According to the sixth embodiment, the object-side surface and image-side surface of each of the first lens 610 to the seventh lens 670 can be aspherical surfaces.

[0162] Table 12

[0163] Seventh Embodiment

[0164] Figure 7A This is a configuration diagram showing an optical imaging system according to a seventh embodiment of the present disclosure. Figure 7B This is a graph showing the aberration characteristics of an optical imaging system according to a seventh embodiment of the present disclosure.

[0165] Reference Figure 7AThe optical imaging system 700 according to the seventh embodiment of this disclosure may include a first lens 710, a second lens 720, a third lens 730, a fourth lens 740, a fifth lens 750, a sixth lens 760, and a seventh lens 770 arranged sequentially along the optical axis of the optical imaging system 700 from the object side of the optical imaging system 700 toward the imaging surface IP of the optical imaging system 700. Furthermore, a filter F and an image sensor IS having the imaging surface IP may be disposed on the image side of the seventh lens 770. Additionally, although not shown in the figures, an aperture stop may be disposed between the fifth lens 750 and the sixth lens 760.

[0166] The optical imaging system 700 according to the seventh embodiment of this disclosure may include a first lens group LG1 and a second lens group LG2, and the optical path conversion member P may be disposed between the first lens group LG1 and the second lens group LG2. That is, the first lens group LG1 and the second lens group LG2 may have different optical axes.

[0167] According to a seventh embodiment of this disclosure, the first lens group LG1 may include a first lens 710 and a second lens 720 arranged sequentially along the first optical axis OA1. The second lens group LG2 may include a third lens 730, a fourth lens 740, a fifth lens 750, a sixth lens 760, and a seventh lens 770 arranged sequentially along the second optical axis OA2. The optical path conversion member P can change the path of the incident light from the direction of the first optical axis OA1 to the direction of the second optical axis OA2.

[0168] The characteristics of the lenses included in the optical imaging system 700 according to the seventh embodiment of the present disclosure are listed in Table 13 below.

[0169] Table 13

[0170] According to a seventh embodiment of this disclosure, the first lens 710 may have positive refractive power, and both the object-side and image-side surfaces of the first lens 710 may have convex shapes in their respective paraxial regions. The second lens 720 may have negative refractive power, and both the object-side and image-side surfaces of the second lens 720 may have convex shapes in their respective paraxial regions. The third lens 730 may have positive refractive power, and both the object-side and image-side surfaces of the third lens 730 may have convex shapes in their respective paraxial regions. The fourth lens 740 may have negative refractive power, and both the object-side and image-side surfaces of the fourth lens 740 may have convex shapes in their respective paraxial regions. The fifth lens 750 may have positive refractive power, and both the object-side and image-side surfaces of the fifth lens 750 may have convex shapes in their respective paraxial regions. The sixth lens 760 may have negative refractive power, and both the object-side and image-side surfaces of the sixth lens 760 may have concave shapes in their respective paraxial regions. The seventh lens 770 may have positive refractive power, and both the object-side and image-side surfaces of the seventh lens 770 may have convex shapes in their paraxial regions.

[0171] The aspherical coefficients K, A to H, J, and L to P of the lenses included in the optical imaging system 700 according to the seventh embodiment of this disclosure, as discussed in Equation 1 above, are listed in Table 14 below. According to the seventh embodiment, the object-side surface and image-side surface of each of the first lens 710 to the seventh lens 770 can be aspherical surfaces.

[0172] Table 14

[0173] Eighth embodiment

[0174] Figure 8A This is a configuration diagram showing an optical imaging system according to an eighth embodiment of the present disclosure. Figure 8B This is a graph showing the aberration characteristics of an optical imaging system according to an eighth embodiment of the present disclosure.

[0175] Reference Figure 8AThe optical imaging system 800 according to the eighth embodiment of this disclosure may include a first lens 810, a second lens 820, a third lens 830, a fourth lens 840, a fifth lens 850, a sixth lens 860, and a seventh lens 870 arranged sequentially along the optical axis of the optical imaging system 800 from the object side of the optical imaging system 800 toward the imaging surface IP of the optical imaging system 800. Furthermore, a filter F and an image sensor IS having the imaging surface IP may be disposed on the image side of the seventh lens 870. Additionally, although not shown in the figures, an aperture stop may be disposed between the fifth lens 850 and the sixth lens 860.

[0176] The optical imaging system 800 according to the eighth embodiment of this disclosure may include a first lens group LG1 and a second lens group LG2, and the optical path conversion member P may be disposed between the first lens group LG1 and the second lens group LG2. That is, the first lens group LG1 and the second lens group LG2 may have different optical axes.

[0177] According to the eighth embodiment of this disclosure, the first lens group LG1 may include a first lens 810 and a second lens 820 arranged sequentially along the first optical axis OA1. The second lens group LG2 may include a third lens 830, a fourth lens 840, a fifth lens 850, a sixth lens 860, and a seventh lens 870 arranged sequentially along the second optical axis OA2. The optical path conversion member P can change the path of the incident light from the direction of the first optical axis OA1 to the direction of the second optical axis OA2.

[0178] The characteristics of the lenses included in the optical imaging system 800 according to the eighth embodiment of the present disclosure are listed in Table 15 below.

[0179] Table 15

[0180] According to the eighth embodiment of this disclosure, the first lens 810 may have positive refractive power, and both the object-side and image-side surfaces of the first lens 810 may have convex shapes in their respective paraxial regions. The second lens 820 may have negative refractive power, and both the object-side and image-side surfaces of the second lens 820 may have convex shapes in their respective paraxial regions. The third lens 830 may have positive refractive power, and both the object-side and image-side surfaces of the third lens 830 may have convex shapes in their respective paraxial regions. The fourth lens 840 may have negative refractive power, and both the object-side and image-side surfaces of the fourth lens 840 may have convex shapes in their respective paraxial regions. The fifth lens 850 may have positive refractive power, and both the object-side and image-side surfaces of the fifth lens 850 may have convex shapes in their respective paraxial regions. The sixth lens 860 may have negative refractive power, and both the object-side and image-side surfaces of the sixth lens 860 may have concave shapes in their respective paraxial regions. The seventh lens 870 may have positive refractive power, and both the object-side and image-side surfaces of the seventh lens 870 may have convex shapes in their paraxial regions.

[0181] The aspherical coefficients K, A to H, J, and L to P of the lenses included in the optical imaging system 800 according to the eighth embodiment of this disclosure, according to Formula 1 discussed above, are listed in Table 16 below. According to the eighth embodiment, the object-side surface and image-side surface of each of the first lens 810 to the seventh lens 870 can be aspherical surfaces.

[0182] Table 16

[0183] Table 17 below lists the optical and physical characteristics of the optical imaging systems according to the first to eighth embodiments of this disclosure. The TTL in Table 17 is the distance along the optical axis from the object side of the first lens to the imaging plane, but it does not appear in any of the conditional expressions 1 to 15 discussed above.

[0184] Table 17

[0185] Table 18 below lists the condition expression values ​​according to the first to eighth embodiments of this disclosure.

[0186] Table 18

[0187] According to embodiments of this disclosure, the low-light performance of a telephoto camera can be improved while minimizing the increase in the telephoto camera's height. Furthermore, clear images can be obtained even in high magnification mode.

[0188] 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: The first lens group includes a first lens and a second lens arranged sequentially along a first optical axis from the object side of the first lens group toward the image side of the first lens group; The second lens group includes a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially along a second optical axis perpendicular to the first optical axis from the object side of the second lens group toward the imaging surface of the optical imaging system; as well as An optical path conversion component is disposed between the first lens group and the second lens group. The optical path conversion component is configured to change the direction of light travel from the direction of the first optical axis to the direction of the second optical axis. Wherein, the condition 0.5 ≤ |f / f1| + |f / f2| ≤ 1.5 is satisfied, where f is the focal length of the optical imaging system, f1 is the focal length of the first lens, and f2 is the focal length of the second lens, and The optical imaging system has a total of seven lenses.

2. The optical imaging system according to claim 1, wherein, The first lens and the second lens have refractive powers with opposite signs.

3. The optical imaging system according to claim 1, wherein, The condition 1 ≤ fG1 / f ≤ 3 is satisfied, where fG1 is the focal length of the first lens group.

4. The optical imaging system according to claim 1, wherein, The condition expression 2 ≤ f3 / f4 ≤ -1 is satisfied, where f3 is the focal length of the third lens and f4 is the focal length of the fourth lens.

5. The optical imaging system according to claim 1, wherein, The condition 1.0 ≤ (F number × SD1) / f ≤ 3.0 is satisfied, where SD1 is the diameter of the first lens and the F number is the value representing the brightness of the optical imaging system.

6. The optical imaging system according to claim 1, wherein, The condition 1.5 ≤ f / BFL ≤ 3.0 is satisfied, where BFL is the distance along the second optical axis from the image side of the seventh lens to the imaging plane.

7. The optical imaging system according to claim 1, wherein, The third lens has positive refractive power, the fourth lens has negative refractive power, the fifth lens has positive refractive power, the sixth lens has negative refractive power, and the seventh lens has positive refractive power.

8. The optical imaging system according to claim 1, wherein, The object-side surface of the third lens has a convex shape in its paraxial region, and the image-side surface of the fourth lens has a concave shape in its paraxial region.

9. The optical imaging system according to claim 1, wherein, The first lens has positive refractive power, and the image-side surface of the first lens has a convex shape in its paraxial region.

10. The optical imaging system according to claim 1, wherein, The first lens has negative refractive power, and the image-side surface of the first lens has a concave shape in its paraxial region.

11. The optical imaging system according to claim 1, wherein, The second lens has negative refractive power, and the image-side surface of the second lens has a concave shape in its paraxial region.

12. The optical imaging system according to claim 1, wherein, The second lens has negative refractive power, and the image side of the second lens has a convex shape in its paraxial region.

13. The optical imaging system according to claim 1, wherein, The second lens has positive refractive power, and the image-side surface of the second lens has a convex shape in its paraxial region.

14. The optical imaging system according to claim 1, wherein, The object-side and image-side of the sixth lens both have concave shapes in their respective paraxial regions.

15. The optical imaging system according to claim 1, wherein, The image-side surface of the fifth lens has a convex shape in its paraxial region, and the object-side surface of the seventh lens has a convex shape in its paraxial region.

16. An optical imaging system, comprising: An optical path conversion component is configured to change the path of light passing through the optical imaging system; A first lens group is disposed on the object side of the optical path conversion member, and the first lens group includes a plurality of lenses arranged sequentially along a first optical axis; as well as A second lens group is disposed on the image side of the optical path conversion member. The second lens group includes a plurality of lenses arranged sequentially along a second optical axis perpendicular to the first optical axis. In this case, the total number of lenses in the second lens group is greater than the total number of lenses in the first lens group. The condition 1.0 ≤ fG2 / dG1G2 ≤ 4.5 is satisfied, where fG2 is the focal length of the second lens group, and dG1G2 is the distance between the first lens group and the second lens group along the first optical axis and the second optical axis. The optical imaging system has a total of seven lenses.

17. The optical imaging system according to claim 16, wherein, The plurality of lenses in the first lens group include a first lens and a second lens arranged sequentially along the first optical axis from the object side of the first lens group toward the optical path conversion member. The second lens group comprises a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially along the second optical axis from the object side of the second lens group toward the imaging surface of the optical imaging system. The conditional expression -2 ≤ f3 / f4 ≤ -1 is satisfied, where f3 is the focal length of the third lens and f4 is the focal length of the fourth lens.

18. The optical imaging system according to claim 17, wherein, The first lens and the second lens have refractive powers of opposite signs. The third lens, the fifth lens, and the seventh lens have positive refractive power, and The fourth lens and the sixth lens have negative refractive power.

19. The optical imaging system according to claim 16, wherein, Satisfying the conditional expression / mm ≤ FOV / IMGHT ≤ / mm, where FOV is the field of view of the optical imaging system, and IMG HT is half the diagonal length of the imaging surface of the optical imaging system.

20. The optical imaging system according to claim 16, wherein, The condition expression 1.5 ≤ h1 / h2 ≤ 3 is satisfied, where h1 is the maximum height of the optical imaging system along the first optical axis, and h2 is the maximum height of the second lens group along the first optical axis.

Images