Optical imaging system

Abstract

The present disclosure relates to an optical imaging system. The optical imaging system includes, in order from an object side, a first lens group, a light path conversion member, and a second lens group, wherein the first lens group includes a plurality of lenses arranged along a first optical axis, and the second lens group includes a plurality of lenses arranged along a second optical axis, and wherein the optical imaging system satisfies a conditional expression 1.5 ≤ fG1 / f ≤ 3.0, where fG1 is a focal length of the first lens group, and f is a focal length of the optical imaging system.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority of Korean Patent Application No. 10-2025-0026322 filed with the Korean Intellectual Property Office on February 28, 2025, the entire disclosure of which is incorporated herein by reference for all purposes. Technical Field

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

[0004] In the mobile camera market, demand for telephoto camera modules capable of achieving high magnification continues to grow.

[0005] Accordingly, camera modules having a structure that bends the optical path by arranging a reflective member such as a prism in front of the lens have been adopted to increase the focal length without increasing the size of the module.

[0006] Meanwhile, even with the above structure, there may still be problems that need improvement such as low-light imaging performance, and development of telephoto camera modules to solve these problems is required.

[0007] The above information is presented as background information only to assist in understanding the present disclosure. No determination or assertion is made as to whether any of the foregoing can be applied as prior art with respect to the present disclosure. Summary of the Invention

[0008] This Summary of the Invention is provided to introduce a selection of concepts in a simplified form, which are further described in the Detailed Description section below. This Summary of the Invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to help determine the scope of the claimed subject matter.

[0009] In one general aspect, an optical imaging system includes a first lens group, an optical path converting member, and a second lens group sequentially arranged from the object side, wherein the first lens group includes a plurality of lenses arranged along a first optical axis, the second lens group includes a plurality of lenses arranged along a second optical axis, and the optical imaging system satisfies the conditional expression 1.5≤fG1 / f≤3.0, wherein fG1 is the focal length of the first lens group, and f is the focal length of the optical imaging system.

[0010] The optical imaging system may satisfy the conditional expression 1.0 < fG1 / fG2 ≤ 2.0, wherein fG2 is the focal length of the second lens group.

[0011] The optical imaging system can satisfy the condition 2≤h1 / h2≤3, where h1 is the maximum height of the optical imaging system in the first optical axis direction, and h2 is the maximum height of the second lens group in the first optical axis direction.

[0012] The optical imaging system can satisfy the conditional expression 0.5 mm ≤ h2 / Fno ≤ 2 mm, where h2 is the maximum height of the second lens group in the direction of the first optical axis, and Fno is the F number of the optical imaging system.

[0013] The first lens group may include a first lens and a second lens arranged sequentially from the object side, and the first lens may have positive refractive power and the second lens may have negative refractive power.

[0014] The optical imaging system can satisfy the conditional expression 0.5≤|f / f1|+|f / f2|≤2.0, where f1 is the focal length of the first lens and f2 is the focal length of the second lens.

[0015] Both the image-side surface of the first lens and the object-side surface of the second lens can be concave.

[0016] The first lens group and the second lens group can each have positive refractive power, and the focal length of the second lens group can be shorter than that of the first lens group.

[0017] An optical imaging system may include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially from the object side, and may satisfy the conditional expression 0.3≤dG1G2 / OAL≤0.5, where dG1G2 is the distance on the optical axis between the first lens group and the second lens group, OAL is the distance on the optical axis from the object side of the first lens to the imaging plane, and the optical axis includes the first optical axis and the second optical axis.

[0018] The first lens can have positive refractive power, the second lens can have negative refractive power, the third lens can have positive refractive power, the fourth lens can have negative refractive power, and the fifth lens can have negative refractive power.

[0019] The first lens group may include a first lens and a second lens, and the second lens group may include a third lens, a fourth lens, and a fifth lens.

[0020] The object-side surface of the third lens can be convex, and the image-side surface of the third lens can be concave.

[0021] The object side of the fourth lens can be convex.

[0022] The object-side surface of the fifth lens can be concave.

[0023] The image-side surface of the fifth lens can be convex.

[0024] The third lens can be a D-shaped cut lens.

[0025] Other features and aspects will become apparent from the following detailed description and accompanying drawings. Attached Figure Description

[0026] Figure 1A This is a schematic diagram of an optical imaging system according to a first embodiment of the present disclosure.

[0027] Figure 1B It is shown Figure 1A The graph shows the aberration characteristics of the optical imaging system.

[0028] Figure 2A This is a schematic diagram of an optical imaging system according to a second embodiment of the present disclosure.

[0029] Figure 2B It is shown Figure 2A The graph shows the aberration characteristics of the optical imaging system.

[0030] Figure 3A This is a schematic diagram of an optical imaging system according to a third embodiment of the present disclosure.

[0031] Figure 3B It is shown Figure 3A The graph shows the aberration characteristics of the optical imaging system.

[0032] Figure 4A This is a schematic diagram of an optical imaging system according to a fourth embodiment of the present disclosure.

[0033] Figure 4B It is shown Figure 4A The graph shows the aberration characteristics of the optical imaging system.

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

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

[0036] Figure 6A This is a schematic diagram of an optical imaging system according to a sixth embodiment of the present disclosure.

[0037] Figure 6B It is shown Figure 6A The graph shows the aberration characteristics of the optical imaging system.

[0038] Figure 7A This is a schematic diagram of an optical imaging system according to the seventh embodiment of the present disclosure.

[0039] Figure 7B It is shown Figure 7A The graph shows the aberration characteristics of the optical imaging system.

[0040] Figure 8A This is a schematic diagram of an optical imaging system according to the eighth embodiment of the present disclosure.

[0041] Figure 8B It is shown Figure 8A The graph shows the aberration characteristics of the optical imaging system.

[0042] Throughout the accompanying drawings and detailed embodiments, unless otherwise described, the same reference numerals refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative dimensions, scale, and depiction of elements in the drawings may be exaggerated. Detailed Implementation

[0043] In the following description, although examples of this disclosure will be described in detail with reference to the accompanying drawings, it should be noted that the examples are not limited thereto.

[0044] The following detailed embodiments are provided to aid the reader in gaining 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 this disclosure. 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 this disclosure. Furthermore, for clarity and brevity, descriptions of features well-known in the art may be omitted.

[0045] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein are provided merely to illustrate some of the many possible ways in which the methods, apparatuses, and / or systems described herein will be apparent upon understanding this disclosure.

[0046] 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.

[0047] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more items; similarly, “at least one” includes any one of the associated listed items and any combination of any two or more items.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] Due to manufacturing techniques and / or tolerances, the shapes shown in the accompanying drawings may vary. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include shape variations that occur during manufacturing.

[0052] It should be noted that in this document, the term "may" is used relative to examples, such as regarding what an example may include or implement, meaning that there exists at least one example that includes or implements such a feature, but not all examples are limited to this.

[0053] The features of the examples described herein can be combined in various ways that will become apparent upon understanding this disclosure. Furthermore, although the examples described herein have multiple configurations, other configurations that will become apparent upon understanding this disclosure are also possible.

[0054] In the accompanying drawings, for illustrative purposes, the thickness, size, and shape of the lenses may be slightly exaggerated. Spherical or aspherical shapes of the lenses may also be provided by way of example only, and embodiments of this disclosure are not intended to be limited to the shapes shown in the drawings.

[0055] The optical imaging system according to embodiments of this disclosure can be mounted on a portable electronic device. For example, the optical imaging system can be part of a camera module mounted on a portable electronic device, and the portable electronic device can be a smartphone, tablet PC, etc.

[0056] In this specification, the first lens (or foremost lens) refers to the lens closest to the object side, and the last lens (or final lens) refers to the lens closest to the imaging surface of the image sensor. Here, the imaging surface refers to the virtual surface in which the optical imaging system focuses or one of the light-receiving surfaces of the image sensor.

[0057] Furthermore, in the description of each lens, the first surface refers to the surface closer to the object side (or object-side surface), and the second surface refers to the surface closer to the image side (or image-side surface).

[0058] Furthermore, in the description of the shape of each lens, a convex shape on a surface means that the corresponding surface is convex in the paraxial region (a very narrow region close to and including the optical axis), and a concave shape on a surface means that the corresponding surface is concave in the paraxial region.

[0059] Furthermore, in this specification, values ​​such as the radius of curvature, thickness, distance, and focal length of the lens are expressed in millimeters (mm), and the field of view (FOV) is expressed in degrees (°).

[0060] One aspect of this disclosure provides an optical imaging system with improved imaging performance, such as image quality and brightness.

[0061] An optical imaging system according to embodiments of the present disclosure includes a plurality of lens groups. For example, the optical imaging system may include a first lens group and a second lens group.

[0062] In an embodiment, the first lens group and the second lens group may each include one or more lenses. For example, the first lens group may include two lenses, and the second lens group may include three lenses. Therefore, the optical imaging system may include five lenses.

[0063] In one embodiment, the optical imaging system may include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially from the object side. The lenses may be spaced apart from each other by a predetermined distance.

[0064] An optical imaging system according to embodiments of the present disclosure may include lenses formed of plastic. For example, the first through fifth lenses may all be formed of plastic.

[0065] An optical imaging system according to embodiments of the present disclosure may include a lens having at least one aspherical surface. For example, at least one of the first to fifth lenses may have at least one aspherical surface among the first and second surfaces. The aspherical surface of the lens is represented by mathematical formula 1.

[0066] Mathematical Formula 1

[0067] In mathematical formula 1, c is the reciprocal of the radius of curvature of the lens, K is the quadratic constant, and Y represents the distance from any point on the aspherical surface of the lens to the optical axis. Furthermore, constants A to P are aspherical constants of orders 4 to 30, and Z (or SAG) represents the distance on the optical axis between any point on the aspherical surface and the corresponding vertex of the aspherical surface.

[0068] An optical imaging system according to embodiments of the present disclosure may include an optical path conversion component that converts the optical path. For example, the optical path conversion component may be a component with a reflective surface, such as a mirror or a prism.

[0069] In this embodiment, the optical path conversion component can be disposed between the first lens group and the second lens group. Therefore, the optical axes of the first lens group and the second lens group can be different. For example, the lenses of the first lens group can be arranged along the first optical axis, the lenses of the second lens group can be arranged along the second optical axis, and the first optical axis and the second optical axis can be substantially perpendicular to each other.

[0070] According to an embodiment, by bending the optical path using an optical path conversion component, a relatively long optical path can be formed within a limited space. Therefore, the optical imaging system can be manufactured compactly while maintaining a long focal length.

[0071] The optical imaging system according to embodiments of the present disclosure may further include an image sensor that converts light reflected from an object into an electrical signal.

[0072] In addition, the optical imaging system may also include an infrared cutoff filter (hereinafter referred to as the "filter") for blocking infrared light incident on the image sensor. The filter may be positioned between the fifth lens and the image sensor.

[0073] In addition, the optical imaging system may also include an aperture stop for controlling the amount of light. For example, the aperture stop may be positioned between the fourth lens and the fifth lens.

[0074] An optical imaging system according to an embodiment of this disclosure may satisfy any one or any two or more of the following conditional expressions: Conditional expression 1: 0.5≤|f / f1|+|f / f2|≤2.0.

[0075] Conditional expression 2: 1.5≤fG1 / f≤3.0.

[0076] Conditional expression 3: 1.0 <fG1 / fG2≤2.0。

[0077] Conditional expression 4: 2≤h1 / h2≤3.

[0078] Conditional expression 5: 0.3≤dG1G2 / OAL≤0.5.

[0079] Conditional expression 6: 0.5 mm ≤ h2 / Fno ≤ 2 mm.

[0080] In the above conditional expressions, f is the total 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, fG1 is the focal length of the first lens group, fG2 is the focal length of the second lens group, h1 is the maximum height of the optical imaging system along the first optical axis, h2 is the maximum height of the second lens group along the first optical axis, dG1G2 is the distance between the first and second lens groups on the optical axis, OAL is the distance on the optical axis from the object side of the first lens to the imaging plane, and Fno is the F-number of the optical imaging system.

[0081] In the above conditional expressions, conditional expression 1 represents the focal length condition of the first lens group (i.e., the first lens and the second lens) used to reduce aberrations. Conditional expressions 2 and 3 represent the focal length conditions of the first and second lens groups used to reduce the size of the second lens group. Conditional expression 4 relates to the design features of the height of a module (e.g., a camera) that is relatively low relative to the optical performance of the optical imaging system. Conditional expression 5 represents the arrangement conditions of the first and second lens groups used to reduce the height of the module (e.g., the camera). Conditional expression 6 represents the relationship between the size of the optical imaging system and its brightness performance.

[0082] According to embodiments of this disclosure, the first lens group may include two lenses, such as a first lens and a second lens. For example, the first lens may have positive refractive power, and the second lens may have negative refractive power. The first lens group as a whole may have positive refractive power. Therefore, light passing through the first lens group can be refracted to converge and enter the optical path conversion member.

[0083] According to embodiments of this disclosure, the second lens group may include three lenses, such as a third lens, a fourth lens, and a fifth lens. For example, the third lens may have positive refractive power, and the fourth and fifth lenses may each have negative refractive power. The second lens group as a whole may have positive refractive power.

[0084] Figure 1A This is a schematic diagram of an optical imaging system according to a first embodiment of the present disclosure, and Figure 1B It is shown Figure 1A The graph shows the aberration characteristics of the optical imaging system.

[0085] An optical imaging system 100 according to a first embodiment of the present disclosure may include a first lens group G1, an optical path conversion component P, and a second lens group G2 arranged sequentially from the object side.

[0086] The first lens group G1 may include a first lens 110 and a second lens 120 arranged sequentially from the object side. The second lens group G2 may include a third lens 130, a fourth lens 140, and a fifth lens 150 arranged sequentially from the object side.

[0087] The maximum height h2 of the second lens group G2 along the first optical axis is shown as a circular lens having the maximum height of the second lens group G2. This is merely illustrative and not intended to be limiting. For example, for a D-shaped cut lens with the minor axis as the maximum height of the second lens group G2 along the first optical axis, h2 can be less than... Figure 1A h2 is shown in the figure.

[0088] In addition, the optical imaging system 100 may also include a filter IF and an image sensor IS with an imaging surface IP.

[0089] The optical path conversion component P can be arranged between the first lens group G1 and the second lens group G2, for example, between the second lens 120 and the third lens 130. For example, the optical path conversion component P can be configured as a prism including a reflective surface.

[0090] The physical and optical characteristics of the optical elements constituting the optical imaging system 100 according to the first embodiment of the present disclosure are shown in Table 1 below.

[0091] Table 1

[0092] In the first embodiment of this disclosure, the first lens 110 may have positive refractive power, its first surface may be convex, and its second surface may be concave. The second lens 120 may have negative refractive power, and both its first and second surfaces may be concave. The third lens 130 may have positive refractive power, its first surface may be convex, and its second surface may be concave. The fourth lens 140 may have negative refractive power, its first surface may be convex, and its second surface may be concave. The fifth lens 150 may have negative refractive power, its first surface may be concave, and its second surface may be convex.

[0093] According to a first embodiment of this disclosure, the second lens group G2 may include a D-shaped cut lens. For example, the third lens 130 may be configured as a D-shaped cut lens. A D-shaped cut lens is a lens whose edge has been partially cut off, including a pair of arcuate portions and a straight portion connecting the pair of arcuate portions. The D-shaped cut lens has a major axis and a minor axis, and the effective radius of the major axis refers to the straight-line distance from the center of the lens to the arcuate portion, and the effective radius of the minor axis refers to the straight-line distance from the center of the lens to the straight portion.

[0094] The aspherical data of each lens constituting the optical imaging system 100 according to the first embodiment of the present disclosure are shown in Table 2 below. According to the first embodiment, the first and second surfaces of the first lens 110 to the fifth lens 150 can both be aspherical.

[0095] Table 2

[0096] Figure 2A This is a schematic diagram of an optical imaging system according to a second embodiment of the present disclosure, and Figure 2B It is shown Figure 2A The graph shows the aberration characteristics of the optical imaging system.

[0097] An optical imaging system 200 according to a second embodiment of the present disclosure may include a first lens group G1, an optical path conversion component P, and a second lens group G2 arranged sequentially from the object side.

[0098] The first lens group G1 may include a first lens 210 and a second lens 220 arranged sequentially from the object side. The second lens group G2 may include a third lens 230, a fourth lens 240, and a fifth lens 250 arranged sequentially from the object side.

[0099] In addition, the optical imaging system 200 may also include a filter IF and an image sensor IS with an imaging surface IP.

[0100] The optical path conversion component P can be disposed between the first lens group G1 and the second lens group G2, for example, between the second lens 220 and the third lens 230. For example, the optical path conversion component P can be configured as a prism including a reflective surface.

[0101] The physical and optical characteristics of the optical elements constituting the optical imaging system 200 according to the second embodiment of the present disclosure are shown in Table 3 below.

[0102] Table 3

[0103] In the second embodiment of this disclosure, the first lens 210 may have positive refractive power, its first surface may be convex, and its second surface may be concave. The second lens 220 may have negative refractive power, and both its first and second surfaces may be concave. The third lens 230 may have positive refractive power, its first surface may be convex, and its second surface may be concave. The fourth lens 240 may have negative refractive power, its first surface may be convex, and its second surface may be concave. The fifth lens 250 may have negative refractive power, its first surface may be concave, and its second surface may be convex.

[0104] According to a second embodiment of this disclosure, the second lens group G2 may include a D-shaped cut lens. For example, the third lens 230 may be configured as a D-shaped cut lens.

[0105] The aspherical data of each lens constituting the optical imaging system 200 according to the second embodiment of the present disclosure are shown in Table 4 below. According to the second embodiment, the first and second surfaces of the first lens 210 to the fifth lens 250 can both be aspherical.

[0106] Table 4

[0107] Figure 3A This is a schematic diagram of an optical imaging system according to a third embodiment of the present disclosure, and Figure 3B It is shown Figure 3A The graph shows the aberration characteristics of the optical imaging system.

[0108] An optical imaging system 300 according to a third embodiment of the present disclosure may include a first lens group G1, an optical path conversion member P, and a second lens group G2 arranged sequentially from the object side.

[0109] The first lens group G1 may include a first lens 310 and a second lens 320 arranged sequentially from the object side. The second lens group G2 may include a third lens 330, a fourth lens 340, and a fifth lens 350 arranged sequentially from the object side.

[0110] In addition, the optical imaging system 300 may also include a filter IF and an image sensor IS with an imaging surface IP.

[0111] The optical path conversion component P can be disposed between the first lens group G1 and the second lens group G2, for example, between the second lens 320 and the third lens 330. For example, the optical path conversion component P can be configured as a prism including a reflective surface.

[0112] The physical and optical characteristics of the optical elements constituting the optical imaging system 300 according to the third embodiment of the present disclosure are shown in Table 5 below.

[0113] Table 5

[0114] In the third embodiment of this disclosure, the first lens 310 may have positive refractive power, its first surface may be convex, and its second surface may be concave. The second lens 320 may have negative refractive power, and both its first and second surfaces may be concave. The third lens 330 may have positive refractive power, its first surface may be convex, and its second surface may be concave. The fourth lens 340 may have negative refractive power, its first surface may be convex, and its second surface may be concave. The fifth lens 350 may have negative refractive power, its first surface may be concave, and its second surface may be convex.

[0115] According to a third embodiment of this disclosure, the second lens group G2 may include a D-shaped cut lens. For example, the third lens 330 may be configured as a D-shaped cut lens.

[0116] The aspherical data of each lens constituting the optical imaging system 300 according to the third embodiment of the present disclosure are shown in Table 6 below. According to the third embodiment, the first and second surfaces of the first lens 310 to the fifth lens 350 can both be aspherical.

[0117] Table 6

[0118] Figure 4A This is a schematic diagram of an optical imaging system according to a fourth embodiment of the present disclosure, and Figure 4B It is shown Figure 4A The graph shows the aberration characteristics of the optical imaging system.

[0119] An optical imaging system 400 according to a fourth embodiment of the present disclosure may include a first lens group G1, an optical path conversion member P, and a second lens group G2 arranged sequentially from the object side.

[0120] The first lens group G1 may include a first lens 410 and a second lens 420 arranged sequentially from the object side. The second lens group G2 may include a third lens 430, a fourth lens 440, and a fifth lens 450 arranged sequentially from the object side.

[0121] In addition, the optical imaging system 400 may also include a filter IF and an image sensor IS with an imaging surface IP.

[0122] The optical path conversion component P can be disposed between the first lens group G1 and the second lens group G2, for example, between the second lens 420 and the third lens 430. For example, the optical path conversion component P can be configured as a prism including a reflective surface.

[0123] The physical and optical characteristics of the optical elements constituting the optical imaging system 400 according to the fourth embodiment of the present disclosure are shown in Table 7 below.

[0124] Table 7

[0125] In the fourth embodiment of this disclosure, the first lens 410 may have positive refractive power, its first surface may be convex, and its second surface may be concave. The second lens 420 may have negative refractive power, and both its first and second surfaces may be concave. The third lens 430 may have positive refractive power, its first surface may be convex, and its second surface may be concave. The fourth lens 440 may have negative refractive power, its first surface may be convex, and its second surface may be concave. The fifth lens 450 may have negative refractive power, its first surface may be concave, and its second surface may be convex.

[0126] According to a fourth embodiment of this disclosure, the second lens group G2 may include a D-shaped cut lens. For example, the third lens 430 may be configured as a D-shaped cut lens.

[0127] The aspherical data of each lens constituting the optical imaging system 400 according to the fourth embodiment of the present disclosure are shown in Table 8 below. According to the fourth embodiment, the first and second surfaces of the first lens 410 to the fifth lens 450 can both be aspherical.

[0128] Table 8

[0129] Figure 5A This is a schematic diagram of an optical imaging system according to a fifth embodiment of the present disclosure, and Figure 5B It is shown Figure 5A The graph shows the aberration characteristics of the optical imaging system.

[0130] An optical imaging system 500 according to a fifth embodiment of the present disclosure may include a first lens group G1, an optical path conversion member P, and a second lens group G2 arranged sequentially from the object side.

[0131] The first lens group G1 may include a first lens 510 and a second lens 520 arranged sequentially from the object side. The second lens group G2 may include a third lens 530, a fourth lens 540, and a fifth lens 550 arranged sequentially from the object side.

[0132] In addition, the optical imaging system 500 may also include a filter IF and an image sensor IS with an imaging surface IP.

[0133] The optical path conversion component P can be disposed between the first lens group G1 and the second lens group G2, for example, between the second lens 520 and the third lens 530. For example, the optical path conversion component P can be configured as a prism including a reflective surface.

[0134] The physical and optical characteristics of the optical elements constituting the optical imaging system 500 according to the fifth embodiment of the present disclosure are shown in Table 9 below.

[0135] Table 9

[0136] In the fifth embodiment of this disclosure, the first lens 510 may have positive refractive power, its first surface may be convex, and its second surface may be concave. The second lens 520 may have negative refractive power, and both its first and second surfaces may be concave. The third lens 530 may have positive refractive power, its first surface may be convex, and its second surface may be concave. The fourth lens 540 may have negative refractive power, its first surface may be convex, and its second surface may be concave. The fifth lens 550 may have negative refractive power, its first surface may be concave, and its second surface may be convex.

[0137] According to a fifth embodiment of this disclosure, the second lens group G2 may include a D-shaped cut lens. For example, the third lens 530 may be configured as a D-shaped cut lens.

[0138] The aspherical data of each lens constituting the optical imaging system 500 according to the fifth embodiment of the present disclosure are shown in Table 10 below. According to the fifth embodiment, the first and second surfaces of the first lens 510 to the fifth lens 550 can both be aspherical.

[0139] Table 10

[0140] Figure 6A This is a schematic diagram of an optical imaging system according to a sixth embodiment of the present disclosure, and Figure 6B It is shown Figure 6A The graph shows the aberration characteristics of the optical imaging system.

[0141] An optical imaging system 600 according to a sixth embodiment of the present disclosure may include a first lens group G1, an optical path conversion member P, and a second lens group G2 arranged sequentially from the object side.

[0142] The first lens group G1 may include a first lens 610 and a second lens 620 arranged sequentially from the object side. The second lens group G2 may include a third lens 630, a fourth lens 640, and a fifth lens 650 arranged sequentially from the object side.

[0143] In addition, the optical imaging system 600 may also include a filter IF and an image sensor IS with an imaging surface IP.

[0144] The optical path conversion component P can be disposed between the first lens group G1 and the second lens group G2, for example, between the second lens 620 and the third lens 630. For example, the optical path conversion component P can be configured as a prism including a reflective surface.

[0145] The physical and optical characteristics of the optical elements constituting the optical imaging system 600 according to the sixth embodiment of the present disclosure are shown in Table 11 below.

[0146] Table 11

[0147] In the sixth embodiment of this disclosure, the first lens 610 may have positive refractive power, its first surface may be convex, and its second surface may be concave. The second lens 620 may have negative refractive power, and both its first and second surfaces may be concave. The third lens 630 may have positive refractive power, its first surface may be convex, and its second surface may be concave. The fourth lens 640 may have negative refractive power, its first surface may be convex, and its second surface may be concave. The fifth lens 650 may have negative refractive power, its first surface may be concave, and its second surface may be convex.

[0148] According to a sixth embodiment of this disclosure, the second lens group G2 may include a D-shaped cut lens. For example, the third lens 630 may be configured as a D-shaped cut lens.

[0149] The aspherical data of each lens constituting the optical imaging system 600 according to the sixth embodiment of the present disclosure are shown in Table 12 below. According to the sixth embodiment, the first and second surfaces of the first lens 610 to the fifth lens 650 can both be aspherical.

[0150] Table 12

[0151] Figure 7A This is a schematic diagram of an optical imaging system according to the seventh embodiment of the present disclosure, and Figure 7B It is shown Figure 7A The graph shows the aberration characteristics of the optical imaging system.

[0152] An optical imaging system 700 according to a seventh embodiment of the present disclosure may include a first lens group G1, an optical path conversion member P, and a second lens group G2 arranged sequentially from the object side.

[0153] The first lens group G1 may include a first lens 710 and a second lens 720 arranged sequentially from the object side. The second lens group G2 may include a third lens 730, a fourth lens 740, and a fifth lens 750 arranged sequentially from the object side.

[0154] In addition, the optical imaging system 700 may also include a filter IF and an image sensor IS with an imaging surface IP.

[0155] The optical path conversion component P can be disposed between the first lens group G1 and the second lens group G2, for example, between the second lens 720 and the third lens 730. For example, the optical path conversion component P can be configured as a prism including a reflective surface.

[0156] The physical and optical characteristics of the optical elements constituting the optical imaging system 700 according to the seventh embodiment of the present disclosure are shown in Table 13 below.

[0157] Table 13

[0158] In the seventh embodiment of this disclosure, the first lens 710 may have positive refractive power, its first surface may be convex, and its second surface may be concave. The second lens 720 may have negative refractive power, and both its first and second surfaces may be concave. The third lens 730 may have positive refractive power, its first surface may be convex, and its second surface may be concave. The fourth lens 740 may have negative refractive power, its first surface may be convex, and its second surface may be concave. The fifth lens 750 may have negative refractive power, its first surface may be concave, and its second surface may be convex.

[0159] According to a seventh embodiment of this disclosure, the second lens group G2 may include a D-shaped cut lens. For example, the third lens 730 may be configured as a D-shaped cut lens.

[0160] The aspherical data of each lens constituting the optical imaging system 700 according to the seventh embodiment of the present disclosure are shown in Table 14 below. According to the seventh embodiment, the first and second surfaces of the first lens 710 to the fifth lens 750 can both be aspherical.

[0161] Table 14

[0162] Figure 8A This is a schematic diagram of an optical imaging system according to the eighth embodiment of the present disclosure, and Figure 8B It is shown Figure 8A The graph shows the aberration characteristics of the optical imaging system.

[0163] An optical imaging system 800 according to an eighth embodiment of the present disclosure may include a first lens group G1, an optical path conversion member P, and a second lens group G2 arranged sequentially from the object side.

[0164] The first lens group G1 may include a first lens 810 and a second lens 820 arranged sequentially from the object side. The second lens group G2 may include a third lens 830, a fourth lens 840, and a fifth lens 850 arranged sequentially from the object side.

[0165] In addition, the optical imaging system 800 may also include a filter IF and an image sensor IS with an imaging surface IP.

[0166] The optical path conversion component P can be disposed between the first lens group G1 and the second lens group G2, for example, between the second lens 820 and the third lens 830. For example, the optical path conversion component P can be configured as a prism including a reflective surface.

[0167] The physical and optical characteristics of the optical elements constituting the optical imaging system 800 according to the eighth embodiment of the present disclosure are shown in Table 15 below.

[0168] Table 15

[0169] In the eighth embodiment of this disclosure, the first lens 810 may have positive refractive power, its first surface may be convex, and its second surface may be concave. The second lens 820 may have negative refractive power, and both its first and second surfaces may be concave. The third lens 830 may have positive refractive power, its first surface may be convex, and its second surface may be concave. The fourth lens 840 may have negative refractive power, its first surface may be convex, and its second surface may be concave. The fifth lens 850 may have negative refractive power, its first surface may be concave, and its second surface may be convex.

[0170] According to an eighth embodiment of this disclosure, the second lens group G2 may include a D-shaped cut lens. For example, the third lens 830 may be configured as a D-shaped cut lens.

[0171] The aspherical data of each lens constituting the optical imaging system 800 according to the eighth embodiment of the present disclosure are shown in Table 16 below. According to the eighth embodiment, the first and second surfaces of the first lens 810 to the fifth lens 850 can both be aspherical.

[0172] Table 16

[0173] Table 17 shows other physical and optical parameters, including the focal lengths of the various lenses constituting the optical imaging system according to embodiments of the present disclosure. In Table 17, 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, BFL is the distance along the optical axis from the image-side surface of the fifth lens to the imaging plane, and IMH is the maximum effective image height (IMG HT) of the optical imaging system, which is equal to half the diagonal length of the effective imaging area of ​​the imaging plane of the image sensor. Table 18 shows conditional expression data according to embodiments of the present disclosure.

[0174] Table 17

[0175] Table 18

[0176] The optical imaging system according to embodiments of this disclosure can achieve high-quality and bright image capture and further reduce module height.

[0177] While specific examples have been shown and described above, it will be apparent upon understanding this disclosure that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be understood in a descriptive sense only and not for limiting purposes. The description of features or aspects in each example should be considered applicable to similar features or aspects in other examples. 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, comprising: a first lens group, an optical path converting member and a second lens group arranged in sequence from an object side, wherein the first lens group comprises a plurality of lenses arranged along a first optical axis, and the second lens group comprises a plurality of lenses arranged along a second optical axis, and wherein the optical imaging system satisfies the conditional expression 1.5≤fG1 / f≤3.0, where fG1 is the focal length of the first lens group, and f is the focal length of the optical imaging system.

2. The optical imaging system according to claim 1, wherein, The optical imaging system satisfies the conditional expression 1.0<fG1 / fG2≤2.0, where fG2 is the focal length of the second lens group.

3. The optical imaging system according to claim 1, wherein, The optical imaging system satisfies the conditional expression 2≤h1 / h2≤3, where h1 is the maximum height of the optical imaging system in the direction of the first optical axis, and h2 is the maximum height of the second lens group in the direction of the first optical axis.

4. The optical imaging system according to claim 1, wherein, The optical imaging system satisfies the conditional expression 0.5mm≤h2 / Fno≤2 mm, where h2 is the maximum height of the second lens group in the direction of the first optical axis, and Fno is the F-number of the optical imaging system.

5. The optical imaging system according to claim 1, wherein, The first lens group comprises a first lens and a second lens arranged in sequence from the object side, and the first lens has positive refractive power, and the second lens has negative refractive power.

6. The optical imaging system according to claim 5, wherein, The optical imaging system satisfies the conditional expression 0.5≤|f / f1|+|f / f2|≤2.0, where f1 is the focal length of the first lens, and f2 is the focal length of the second lens.

7. The optical imaging system according to claim 5, wherein, Both the image side surface of the first lens and the object side surface of the second lens are concave.

8. The optical imaging system according to claim 1, wherein, Each of the first lens group and the second lens group has positive refractive power, and the focal length of the second lens group is shorter than that of the first lens group.

9. The optical imaging system according to claim 1, wherein, The optical imaging system comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence from the object side, and satisfies the conditional expression 0.3≤dG1G2 / OAL≤0.5, where dG1G2 is the distance between the first lens group and the second lens group on the optical axis, OAL is the distance from the object side surface of the first lens to an imaging surface on the optical axis, and the optical axis comprises the first optical axis and the second optical axis.

10. The optical imaging system according to claim 9, wherein, The first lens has positive refractive power, the second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has negative refractive power, and the fifth lens has negative refractive power.

11. The optical imaging system according to claim 10, wherein, The first lens group comprises the first lens and the second lens, and the second lens group comprises the third lens, the fourth lens and the fifth lens.

12. The optical imaging system according to claim 10, wherein, The object side surface of the third lens is convex, and the image side surface of the third lens is concave.

13. The optical imaging system according to claim 10, wherein, The object side surface of the fourth lens is convex.

14. The optical imaging system according to claim 10, wherein, The object side surface of the fifth lens is concave.

15. The optical imaging system according to claim 10, wherein, The image side surface of the fifth lens is convex.

16. The optical imaging system according to claim 10, wherein, The third lens is a D-cut lens.

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