Optical image capturing system

Abstract

The present disclosure relates to an optical imaging system including: a first lens group having at least two reflective surfaces and including a first lens and a second lens; a second lens group including a plurality of lenses; and a reflective member disposed between the first lens group and the second lens group, in which at least two reflective surfaces include a first reflective surface formed on an image-side surface of the second lens and a second reflective surface formed on an object-side surface of the first lens, the object-side surface of the first lens including a first refractive surface, and the object-side surface of the second lens including a second refractive surface. The image-side surface of the second lens includes a second refractive surface, and the reflective member includes a third reflective surface, and a conditional expression f1G / fTlt is satisfied; and 0.9 where f1G is the focal length of the first lens group, and fT is the total focal length of the optical imaging system.

Description

[0001] Cross Reference to Related Applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2023-0188813, filed on December 21, 2023, and Korean Patent Application No. 10-2024-0124995, filed on September 12, 2024, in the Korean Intellectual Property Office, the disclosure of each of which is incorporated herein by reference in its entirety for all purposes. TECHNICAL FIELD

[0003] The following description relates to an optical imaging system. BACKGROUND

[0004] Recently, optical imaging systems implemented in portable electronic devices generally have a small form factor and have high magnification (telephoto) performance.

[0005] However, since an optical imaging system having high magnification (telephoto) performance must have a long focal length, there is a problem that the size of the optical imaging system inevitably increases.

[0006] Accordingly, an optical imaging system that bends light by a reflection member has been proposed.

[0007] In addition, recently, a structure in which a part of a lens of an optical imaging system is disposed in front of a reflection member has been proposed.

[0008] However, even with these conventional optical imaging systems, the optical imaging system still has a large size, which limits the installation of a high-resolution optical imaging system in a portable electronic device.

[0009] The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the present disclosure. SUMMARY

[0010] The summary is presented in order to provide a simplified summary of the concepts disclosed herein. The concepts disclosed herein are further described in the detailed description that follows. The summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used in determining the scope of the claimed subject matter.

[0011] In general aspects, an optical imaging system includes: a first lens group including a first lens and a second lens arranged along a first optical axis and having at least two reflecting surfaces; a second lens group including a plurality of lenses arranged along a second optical axis and spaced apart from the first lens group; and a reflecting member disposed between the first lens group and the second lens group, wherein the at least two reflecting surfaces include a first reflecting surface disposed on an image side surface of the second lens and a second reflecting surface disposed on an object side surface of the first lens, wherein the object side surface of the first lens includes a first refractive surface extending outward from the second reflecting surface, wherein the image side surface of the second lens includes a second refractive surface disposed outward from the first reflecting surface, wherein the reflecting member includes a third reflecting surface, and a conditional expression f1G / fT < 0.9 is satisfied, where f1G is a focal length of the first lens group, and fT is a total focal length of the optical imaging system.

[0012] The first lens group can have a positive refractive power, and the second lens group can have a negative refractive power.

[0013] A conditional expression f1G > 0 and Rp < 0 can be satisfied, where Rp is a radius of curvature of the first reflecting surface of the second lens of the first lens group.

[0014] A conditional expression 2 mm < d < 3 mm can be satisfied, where d is a distance from the object side surface of the first lens of the first lens group to the image side surface of the second lens of the first lens group along the first optical axis.

[0015] A conditional expression 0.2 < |(2 x d) / Rp| < 0.6 can be satisfied, where d is a distance from the object side surface of the first lens of the first lens group to the image side surface of the second lens of the first lens group along the first optical axis, and Rp is a radius of curvature of the first reflecting surface of the second lens of the first lens group.

[0016] A conditional expression 0.4 < Hs / Hp < 0.6 can be satisfied, where Hp is an effective diameter of the object side surface of the first lens of the first lens group, and Hs is an effective diameter of the second reflecting surface of the first lens of the first lens group.

[0017] The reflecting member can further include an entrance surface and an exit surface, and the third reflecting surface is disposed between the entrance surface and the exit surface, and a conditional expression 0.4 < d / Ph < 0.8 can be satisfied, where d is a distance from the object side surface of the first lens of the first lens group to the image side surface of the second lens of the first lens group along the first optical axis, and Ph is a sum of a distance from the entrance surface to the third reflecting surface along the first optical axis and a distance from the third reflecting surface to the exit surface along the second optical axis.

[0018] A conditional expression of L / fT<0.8 may be satisfied, where L is the sum of a distance from the third reflective surface to an imaging plane disposed on the second optical axis along the second optical axis and an effective radius of the first lens.

[0019] Can satisfy the conditional expression 0.5 <Rs / Rp<1.3,其中,Rs是第一透镜组的第一透镜的第二反射表面的曲率半径,以及Rp是第一透镜组的第二透镜的第一反射表面的曲率半径。

[0020] Can satisfy conditional expression 1 <f1G / Rp<2.3,其中,Rp是第一透镜组的第二透镜的第一反射表面的曲率半径。

[0021] Can satisfy the conditional expression 0.1 <Lf / fT<0.7,其中,Lf是沿着第一光轴从第一透镜组的第一透镜的第二反射表面到反射构件的第三反射表面的距离。

[0022] Can satisfy the conditional expression 0.2 <Lf / Lr<0.5,其中,Lf是沿着第一光轴从第一透镜组的第一透镜的第二反射表面到反射构件的第三反射表面的距离,以及Lr是沿着第二光轴从反射构件的第三反射表面到成像面的距离。

[0023] The first lens may have negative refractive power, and the second lens may have positive refractive power.

[0024] The plurality of lenses of the second lens group may include a third lens, a fourth lens, and a fifth lens sequentially arranged along the second optical axis, and wherein the fifth lens may have positive refractive power.

[0025] Other features and aspects will be apparent from the following detailed description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A configuration diagram of an exemplary optical imaging system according to the first embodiment is shown.

[0027] Figure 2 Shown Figure 1 Aberration characteristics of the exemplary optical imaging system shown in .

[0028] Figure 3 A configuration diagram of an exemplary optical imaging system according to a second embodiment is shown.

[0029] Figure 4 Shown Figure 3 Aberration characteristics of the exemplary optical imaging system shown in .

[0030] Figure 5A configuration diagram of an exemplary optical imaging system according to the third embodiment is shown.

[0031] Figure 6 Aberration characteristics of the exemplary optical imaging system shown in Figure 5

[0032] Figure 7 An exemplary optical imaging system according to one or more embodiments is shown.

[0033] Figure 8 A plan view of a first lens of an optical imaging system according to one or more embodiments is shown. DETAILED DESCRIPTION

[0034] The following detailed description is presented to help the reader obtain a thorough understanding of the methods, apparatuses, and / or systems described herein. However, the following detailed description is not intended to limit the methods, apparatuses, and / or systems described herein, and variations, modifications, and equivalents of the methods, apparatuses, and / or systems described herein are possible. For example, the order of the operations described herein and / or within operations can be altered, except that the order of operations and / or within operations that must occur can not be altered. As another example, the order of the operations and / or within operations can be performed in parallel, except that at least a portion of the order of operations and / or within operations that must occur in a certain order (e.g., a particular order) can not be performed in parallel. Furthermore, to improve clarity and conciseness, descriptions of features that are known in the art can be omitted.

[0035] Although terms such as “first,” “second,” and “third” or A, B, (a), (b), etc. can be used herein to describe various components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Each of these terms is not used to define the nature, order, or sequence of, for example, a corresponding component, assembly, region, layer, or part, but is used only to distinguish a corresponding component, assembly, region, layer, or part from another component, assembly, region, layer, or part. Therefore, a first component, a first assembly, a first region, a first layer, or a first part mentioned in examples described herein can also be referred to as a second component, a second assembly, a second region, a second layer, or a second part without departing from the teachings of the examples.

[0036] ​Throughout this specification, when a component, element, or layer is described as being “on,” “connected to,” “coupled to,” or “engaged to” another component, element, or layer, it may be directly “on” (e.g., in contact with), directly “connected to,” directly “coupled to,” or directly “engaged to” the other component, element, or layer, or one or more other components, elements, or layers may reasonably be present between them. When a component, element, or layer is described as being “directly on,” “directly connected to,” “directly coupled to,” or “directly engaged to” another component, element, or layer, there are no other components, elements, or layers between them. Similarly, expressions such as “between” and “immediately between,” as well as “adjacent to” and “immediately adjacent to,” may also be interpreted as described above.

[0037] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. The words "one", "a kind of" and "the" are intended to also include plural forms, unless the context clearly indicates otherwise. As non-limiting examples, the terms "include", "comprise" and "have" specify the existence of the stated features, quantities, operations, components, elements and / or their combinations, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations, nor exclude the existence of alternatives that replace the features, quantities, operations, components, elements and / or their combinations. In addition, although an embodiment can set forth the existence of such terms "include", "comprise" and "have" specifying the stated features, quantities, operations, components, elements and / or their combinations, there can be other embodiments in which one or more of the stated features, quantities, operations, components, elements and / or their combinations are not present.

[0038] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more of the associated listed items. The phrases "at least one of A, B, and C," etc. are intended to have separate meanings, and these phrases "at least one of A, B, and C," etc. also include examples in which one or more of A, B, and C can be present (e.g., any combination of one or more of A, B, and C), unless the corresponding description and implementation require that such a list (e.g., "at least one of A, B, and C") be interpreted as having a combined meaning.

[0039] The features described herein can be implemented in different ways and are not to be construed as limited to the examples described herein. Rather, these examples are provided as a description of implementations of the methods, apparatuses, and / or systems described herein for purposes of illustration only and with the understanding that variations and modifications will occur to those of ordinary skill in the art in light of this disclosure. Throughout this document, use of the term "may" (e.g., with respect to what can include or implement what) means that at least one example or implementation includes or implements the feature, and that all examples and implementations are not limited to this. The terms "example" and "implementation" are used herein interchangeably (e.g., the phrase "in one example" has the same meaning as "in one implementation," and "in one or more examples" has the same meaning as "in one or more implementations").

[0040] In the following lens configuration diagrams, the thickness, size, and shape of the lenses are slightly exaggerated for the purpose of illustration, and in particular, only the spherical or aspherical shape presented in the lens configuration diagram is presented as an example, and is not limited to this shape.

[0041] The optical imaging system according to one or more embodiments can be mounted on a portable electronic device. In an example, the optical imaging system can be a component of a camera module mounted on a portable electronic device. The portable electronic device can be a portable electronic device such as, but not limited to, a mobile communication terminal, a smart phone, a tablet personal computer (PC), etc.

[0042] In one or more examples, the values of the lens such as the radius of curvature, the thickness, the distance, the focal length, etc. are all in mm, and the unit of the field of view is degree.

[0043] In addition, in the description of the shape of each lens, the meaning of one surface convex shape means that the paraxial region of the surface is convex, and the meaning of one surface concave shape means that the paraxial region of the surface is concave.

[0044] In an example, the paraxial region refers to a very narrow region near the optical axis.

[0045] The imaging plane can mean a virtual plane on which a focus is formed by the optical imaging system. Alternatively, the imaging plane can mean one surface of the image sensor that receives light.

[0046] One or more examples can provide an optical imaging system that achieves high resolution while having a small size.

[0047] One or more examples can provide an optical imaging system that reduces the size of the optical imaging system and captures a high-resolution image.

[0048] Referring toFigure 7 An optical imaging system according to one or more embodiments includes a plurality of lens groups. For example, the optical imaging system can include a first lens group LG1 and a second lens group LG2.

[0049] The first lens group LG1 can include one or more lenses and a plurality of reflective surfaces, and the second lens group LG2 can include a plurality of lenses.

[0050] In an embodiment, the first lens group LG1 can include a first lens L1 and a second lens L2 including a first reflective surface RS1, and the first lens L1 including a second reflective surface RS2. The second lens group LG2 can include a third lens L3, a fourth lens L4, and a fifth lens L5.

[0051] The first lens L1 and the second lens L2 of the first lens group LG1 can be arranged along a first optical axis, and the third lens L3 to the fifth lens L5 of the second lens group LG2 can be arranged along a second optical axis.

[0052] The first optical axis of the first lens group LG1 and the second optical axis of the second lens group LG2 can intersect each other. For example, a virtual line extending on the first optical axis of the first lens group LG1 and a virtual line extending on the second optical axis of the second lens group LG2 can intersect each other.

[0053] In an embodiment, the first optical axis of the first lens group LG1 and the second optical axis of the second lens group LG2 can be perpendicular to each other.

[0054] In a non-limiting example, the first lens group LG1 can have a positive refractive power as a whole, and the second lens group LG2 can have a negative refractive power as a whole.

[0055] An optical imaging system according to one or more embodiments can further include a reflective member P changing a propagation direction of light. The reflective member P can have a third reflective surface RS3. In an example, the reflective member P can be a mirror or a prism. In an embodiment, the reflective member P can be disposed between the first lens group LG1 and the second lens group LG2.

[0056] When the reflective member P is a prism, the reflective member P can have any shape among shapes obtained by dividing a rectangular parallelepiped or a cube in half in a diagonal direction. The reflective member P can include an entrance surface, the third reflective surface RS3, and an exit surface. The reflective member P can have three rectangular faces and two triangular faces. In an example, the entrance surface, the third reflective surface RS3, and the exit surface of the reflective member P can each have a rectangular shape, and two side surfaces of the reflective member P can have a substantially triangular shape.

[0057] Light passing through the first lens group LG1 can be incident on the incidence surface of the reflection member P, light incident on the incidence surface can be reflected on the third reflection surface RS3, and light reflected on the third reflection surface RS3 can be emitted to the exit surface.

[0058] The optical imaging system according to one or more embodiments can form a long optical path in a relatively narrow space by bending light via the reflection member P.

[0059] Accordingly, the optical imaging system can be miniaturized while allowing the optical imaging system to have a long focal length.

[0060] The optical imaging system according to one or more embodiments can have the characteristics of a telephoto lens having a relatively narrow angle of view and a long focal length.

[0061] An effective diameter of an object side surface of one or more lenses included in the first lens group LG1 and an effective diameter of an image side surface of the one or more lenses included in the first lens group LG1 can each be greater than a minor axis length of the incidence surface of the reflection member P.

[0062] In an example, the one or more lenses included in the first lens group LG1 can be substantially circular when viewed in the first optical axis direction of the first lens group LG1.

[0063] An effective diameter of an object side surface of the plurality of lenses included in the second lens group LG2 and an effective diameter of an image side surface of the plurality of lenses included in the second lens group LG2 can each be less than the minor axis length of the incidence surface of the reflection member P.

[0064] In an example, the lenses included in the second lens group LG2 can be substantially circular when viewed from the second optical axis direction of the second lens group LG2.

[0065] The optical imaging system can further include an image sensor S that converts an image of an incident object into an electrical signal.

[0066] In addition, the optical imaging system can further include an infrared blocking filter (hereinafter referred to as a filter) that blocks infrared rays. The filter can be disposed between the last lens (for example, the fifth lens L5) and the image sensor S.

[0067] The first lens group LG1 can include at least two reflection surfaces. Since the first lens group LG1 includes at least two reflection surfaces, the height (for example, the height in the first optical axis direction) of the optical imaging system can be reduced while achieving a long total focal length (that is, a telephoto lens).

[0068] In an embodiment, if the first lens group LG1 includes two lenses (e.g., the first lens L1 and the second lens L2), at least two reflection surfaces can be disposed on a lens disposed closest to the object side among the two lenses included in the first lens group LG1 (the first lens L1) and a lens disposed adjacent to the lens disposed closest to the object side (the second lens L2).

[0069] For example, the first lens L1 and the second lens L2 can each have at least one reflection surface.

[0070] At least one reflection surface can be formed on the object side surface of the first lens L1, and at least one reflection surface can be formed on the image side surface of the second lens L2.

[0071] In an embodiment, a portion of the object side surface of the first lens L1 can function as a reflection surface, and a portion of the image side surface of the second lens L2 can function as a reflection surface.

[0072] Hereinafter, a reflection surface formed on the image side surface of the second lens L2 will be referred to as a first reflection surface RS1, and a reflection surface formed on the object side surface of the first lens L1 will be referred to as a second reflection surface RS2.

[0073] The object side surface of the first lens L1 can include the second reflection surface RS2 and a first refractive surface TS1. In an example, the second reflection surface RS2 can be formed at a central portion of the object side surface of the first lens L1, and the first refractive surface TS1 can extend from the second reflection surface RS2 to an outer side of the second reflection surface RS2. That is, the second reflection surface RS2 can be disposed on an inner side of the first refractive surface TS1.

[0074] In an example, the "outer side" can refer to a direction away from the first optical axis, and the "inner side" can refer to a direction close to the first optical axis.

[0075] Since the second reflection surface RS2 can be formed at a central portion of the object side surface of the first lens L1, light can be blocked from passing through the central portion of the object side surface of the first lens L1. The light can pass through the first refractive surface TS1 on the object side surface of the first lens L1 and enter the second lens L2.

[0076] The image side surface of the second lens L2 can include the first reflection surface RS1 and a second refractive surface TS2. In an example, the second refractive surface TS2 can be formed at a central portion of the image side surface of the second lens L2, and the first reflection surface RS1 can extend from the second reflection surface TS2 to an outer side of the second reflection surface TS2. That is, the first reflection surface RS1 can be disposed on an outer side (or outside) of the second refractive surface TS2.

[0077] Light passing through the first lens L1 can be reflected by the first reflecting surface RS1 on the image side of the second lens L2 and can return toward the first lens L1. In addition, light reflected by the first reflecting surface RS1 toward the first lens L1 can be reflected by the second reflecting surface RS2 on the object side of the first lens L1 and advance through the second lens L2 and toward the reflecting member P.

[0078] Light passing through the second lens L2 can be reflected by the third reflecting surface RS3 of the reflecting member P and can enter the second lens group LG2.

[0079] In an embodiment, one or more lenses included in the first lens group LG1 and a plurality of lenses included in the second lens group LG2 can each have an aspherical object side surface and an aspherical image side surface.

[0080] An aspherical surface of a lens is represented by the following Equation 1.

[0081] Equation 1:

[0082]

[0083] In Equation 1, c denotes a curvature (an inverse of a radius of curvature) of a lens surface, K denotes a conic constant, and Y denotes a distance of an arbitrary point on an aspherical surface of a lens to an optical axis. In addition, constants A to F denote aspherical coefficients. Further, Z denotes a distance along the optical axis from the arbitrary point on the aspherical surface of the lens to a vertex of the corresponding aspherical surface.

[0084] An optical imaging system according to one or more embodiments can satisfy at least one of the following conditional expressions.

[0085] In an embodiment, the optical imaging system can satisfy the conditional expressions f1G>0 and Rp<0. In an example, f1G is a total focal length of the first lens group LG1, and Rp is a radius of curvature of the first reflecting surface RS1 of the second lens L2 of the first lens group LG1. For example, the first reflecting surface RS1 of the first lens group LG1 can have a concave shape when viewed from the object side. That is, the first reflecting surface RS1 of the first lens group LG1 can have a convex shape toward the image side.

[0086] Accordingly, image brightness can be improved, and resolution can be improved.

[0087] In an embodiment, the optical imaging system can satisfy the conditional expression 2mm<d<3mm. In an example, d is a distance along the first optical axis from the object side surface of the first lens L1 to the image side surface of the second lens L2. Accordingly, the optical imaging system can be miniaturized.

[0088] In an embodiment, the optical imaging system can satisfy a conditional expression |(2xd) / Rp| > 0.4. Alternatively, the optical imaging system can satisfy a conditional expression 0.2 < |(2xd) / Rp| < 0.6.

[0089] Accordingly, the image brightness can be improved, and the resolution can be improved.

[0090] In an embodiment, the optical imaging system can satisfy a conditional expression 0.4 < Hs / Hp < 0.6. In an example, Hp is an effective diameter of an object side surface of the first lens L1, and Hs is an effective diameter of the second reflective surface RS2 of the first lens L1. Accordingly, the image brightness can be improved, and the resolution can be improved.

[0091] In an embodiment, the optical imaging system can satisfy a conditional expression f1G / fT < 0.9. In an example, fT is a total focal length of the optical imaging system. Accordingly, the optical imaging system can be miniaturized.

[0092] In an embodiment, the optical imaging system can satisfy a conditional expression 0.4 < d / Ph < 0.8. In an example, Ph is a sum of a distance from an incident surface of the reflective member P to the third reflective surface RS3 along the first optical axis and a distance from the third reflective surface RS3 of the reflective member P to an exit surface along the second optical axis.

[0093] Accordingly, the optical imaging system can be miniaturized.

[0094] In an embodiment, the optical imaging system can satisfy a conditional expression L / fT < 0.8. In an example, L is a total track length along the second optical axis of the optical imaging system. For example, L can represent a distance from an effective diameter end of the first lens group LG1 in the second optical axis direction to an imaging surface along the second optical axis. Alternatively, L can represent a sum of a distance from the third reflective surface RS3 of the reflective member P to the imaging surface along the second optical axis and an effective radius of the first lens L1.

[0095] Accordingly, the optical imaging system can be miniaturized.

[0096] In an embodiment, the optical imaging system can satisfy a conditional expression 0.5 < Rs / Rp < 1.3. In an example, Rs is a radius of curvature of the second reflective surface RS2 of the first lens group LG1. For example, the second reflective surface RS2 of the first lens group LG1 can have a concave shape. Accordingly, the resolution can be improved.

[0097] In an embodiment, the optical imaging system can satisfy a conditional expression 1 < f1G / Rp < 2.3. Accordingly, the resolution can be improved.

[0098] In an embodiment, the optical imaging system can satisfy a conditional expression 0.1 < Lf / fT < 0.7. In an example, Lf is a distance from the second reflective surface RS2 of the first lens group LG1 to the third reflective surface RS3 of the reflecting member P along the first optical axis. Accordingly, the optical imaging system can be miniaturized.

[0099] In an embodiment, the optical imaging system can satisfy a conditional expression 0.2 < Lf / Lr < 0.5. In an example, Lr is a distance from the third reflective surface RS3 of the reflecting member P to the imaging plane along the second optical axis. Accordingly, the optical imaging system can be miniaturized.

[0100] An exemplary optical imaging system 100 according to a first embodiment will be described with reference to Figure 1 and Figure 2 An exemplary optical imaging system 100 according to a first embodiment will be described with reference to

[0101] The exemplary optical imaging system 100 according to one or more embodiments includes a first lens group LG1 and a second lens group LG2. In addition, the optical imaging system 100 includes a reflecting member P disposed between the first lens group LG1 and the second lens group LG2.

[0102] In order from the object side to the imaging plane, the first lens group LG1 includes a first lens 110 and a second lens 120, and the second lens group LG2 includes a third lens 130, a fourth lens 140, and a fifth lens 150.

[0103] In addition, the optical imaging system 100 can further include an optical filter IF and an image sensor.

[0104] The optical imaging system 100 according to the first embodiment can form a focal point on an imaging plane IP. The imaging plane IP can refer to a surface on which the optical imaging system 100 forms a focal point. For example, the imaging plane IP can refer to one surface of the image sensor on which light is received.

[0105] In the first embodiment, the reflecting member P can be a prism. However, this is only an example, and the reflecting member P can also be provided as a mirror.

[0106] Lens properties (a radius of curvature, a thickness of a lens or a distance between lenses, a refractive index, an Abbe number, and an effective radius) of each lens are shown in Table 1 below.

[0107] In the table below, a "-" symbol of the thickness or distance is due to light reflection.

[0108] Table 1:

[0109]

[0110] Table 1:

[0111] The value listed in Table 1 as the effective radius of the prism refers to the value of the effective radius of the long axis. In the first embodiment, the effective radius of the short axis of the entrance surface of the prism is 2 mm.

[0112] In the first embodiment, the first lens group LG1 can have a positive refractive power as a whole, and the second lens group LG2 can have a negative refractive power as a whole.

[0113] The first lens 110 can have a negative refractive power, the object side surface of the first lens 110 can have a concave shape, and the image side surface of the first lens 110 can have a convex shape.

[0114] The second lens 120 can have a positive refractive power, the object side surface of the second lens 120 can have a concave shape, and the image side surface of the second lens 120 can have a convex shape.

[0115] The third lens 130 can have a negative refractive power, the object side surface of the third lens 130 can have a concave shape, and the image side surface of the third lens 130 can have a convex shape.

[0116] The fourth lens 140 can have a negative refractive power, and the object side surface and the image side surface of the fourth lens 140 can have a concave shape.

[0117] The fifth lens 150 can have a positive refractive power, and the object side surface and the image side surface of the fifth lens 150 can have a convex shape.

[0118] In an example, each surface of the first lens 110 to the fifth lens 150 can have an aspherical coefficient as shown in Table 2 below. In an example, the object side surface and the image side surface of each of the first lens 110 to the fifth lens 150 are aspherical.

[0119] Table 2:

[0120]

[0121]

[0122] An example optical imaging system 200 according to a second embodiment will be described with reference to Figure 3 and Figure 4 An example optical imaging system 200 according to a second embodiment will be described with reference to

[0123] The optical imaging system 200 according to the second embodiment includes a first lens group LG1 and a second lens group LG2. In addition, the optical imaging system 200 includes a reflecting member P disposed between the first lens group LG1 and the second lens group LG2.

[0124] In order from the object side to the imaging surface, the first lens group LG1 includes a first lens 210 and a second lens 220 , and the second lens group LG2 includes a third lens 230 , a fourth lens 240 , and a fifth lens 250 .

[0125] In addition, the optical imaging system 200 may further include an optical filter IF and an image sensor.

[0126] The optical imaging system 200 according to the second embodiment can form a focus on an imaging plane IP. The imaging plane IP may refer to a surface on which a focus is formed by the optical imaging system 200. As an example, the imaging plane IP may refer to a surface of an image sensor that receives light.

[0127] In the second embodiment, the reflective member P may be a prism. However, this is merely an example, and the reflective member P may also be a mirror.

[0128] The lens characteristics (curvature radius, thickness of the lens or distance between lenses, refractive index, Abbe number, and effective radius) of each lens are shown in Table 3 below.

[0129] Table 3:

[0130]

[0131]

[0132] The values ​​described as the effective radius of the prism in Table 3 refer to the values ​​of the major axis effective radius. In the second embodiment, the minor axis effective radius of the incident surface of the prism is 2 mm.

[0133] In the second embodiment, the first lens group LG1 may have positive refractive power as a whole, and the second lens group LG2 may have negative refractive power as a whole.

[0134] The first lens 210 may have negative refractive power, the object-side surface of the first lens 210 may have a concave shape, and the image-side surface of the first lens 210 may have a convex shape.

[0135] The second lens 220 may have positive refractive power, the object-side surface of the second lens 220 may have a concave shape, and the image-side surface of the second lens 220 may have a convex shape.

[0136] The third lens 230 may have positive refractive power, an object-side surface of the third lens 230 may have a concave shape, and an image-side surface of the third lens 230 may have a convex shape.

[0137] The fourth lens 240 may have negative refractive power, and object-side and image-side surfaces of the fourth lens 240 may have concave shapes.

[0138] The fifth lens 250 may have positive refractive power, the object-side surface of the fifth lens 250 may have a convex shape, and the image-side surface of the fifth lens 250 may have a concave shape.

[0139] In an example, each surface of the first to fifth lenses 210 to 250 may have an aspheric coefficient as shown in the following Table 4. In an example, the object-side surface and the image-side surface of each of the first to fifth lenses 210 to 250 may be aspheric.

[0140] Table 4:

[0141]

[0142]

[0143] Will refer to Figure 5 and Figure 6 An exemplary optical imaging system 300 according to a third embodiment is described.

[0144] The exemplary optical imaging system 300 according to the third embodiment includes a first lens group LG1 and a second lens group LG2 . In addition, the optical imaging system 300 includes a reflective member P disposed between the first lens group LG1 and the second lens group LG2 .

[0145] In order from the object side to the imaging surface, the first lens group LG1 may include a first lens 310 and a second lens 320 , and the second lens group LG2 may include a third lens 330 , a fourth lens 340 , and a fifth lens 350 .

[0146] In addition, the optical imaging system 300 may further include an optical filter IF and an image sensor.

[0147] The optical imaging system 300 according to the third embodiment can form a focus on an imaging plane IP. The imaging plane IP may refer to a surface on which a focus is formed by the optical imaging system 300. As an example, the imaging plane IP may refer to a surface of an image sensor that receives light.

[0148] In the third embodiment, the reflective member P may be a prism. However, this is merely an example, and the reflective member P may also be a mirror.

[0149] The lens characteristics (curvature radius, thickness of the lens or distance between lenses, refractive index, Abbe number, and effective radius) of each lens are shown in Table 5 below.

[0150] Table 5

[0151]

[0152]

[0153] The value of the effective radius of the prism described in Table 5 refers to the value of the major axis effective radius. In the third embodiment, the minor axis effective radius of the entrance surface of the prism is 2 mm.

[0154] In the third embodiment, the first lens group LG1 can have a positive refractive power as a whole, and the second lens group LG2 can have a negative refractive power as a whole.

[0155] The first lens 310 can have a negative refractive power, the object side surface of the first lens 310 can have a concave shape, and the image side surface of the first lens 310 can have a convex shape.

[0156] The second lens 320 can have a positive refractive power, the object side surface of the second lens 320 can have a concave shape, and the image side surface of the second lens 320 can have a convex shape.

[0157] The third lens 330 can have a negative refractive power, the object side surface of the third lens 330 can have a convex shape, and the image side surface of the third lens 330 can have a concave shape.

[0158] The fourth lens 340 can have a negative refractive power, the object side surface of the fourth lens 340 can have a convex shape, and the image side surface of the fourth lens 340 can have a concave shape.

[0159] The fifth lens 350 can have a positive refractive power, the object side surface of the fifth lens 350 can have a convex shape, and the image side surface of the fifth lens 350 can have a concave shape.

[0160] In an example, each surface of the first lens 310 to the fifth lens 350 can have an aspherical coefficient as shown in Table 6 below. In an example, the object side surface and the image side surface of each of the first lens 310 to the fifth lens 350 can be aspherical.

[0161] Table 6:

[0162]

[0163]

[0164] Table 7:

[0165]

[0166]

[0167] In Table 7, fT is the total focal length of the optical imaging system, fl is the focal length of the first lens, f2 is the focal length of light reflected from the first reflecting surface of the second lens, f3 is the focal length of light reflected from the second reflecting surface of the first lens, f4 is the focal length of the second lens, f5 is the focal length of the third lens, f6 is the focal length of the fourth lens, and f7 is the focal length of the fifth lens.

[0168] f1G is the total focal length of the first lens group, and f2G is the total focal length of the second lens group.

[0169] IMG HT is half of the diagonal length of the imaging surface, Rs is the radius of curvature of the second reflecting surface of the first lens group, Rp is the radius of curvature of the first reflecting surface of the first lens group, Hp is the effective diameter of the object side surface of the first lens, and Hs is the effective diameter of the second reflecting surface of the first lens.

[0170] L is the sum of the effective radius of the first lens and the distance along the second optical axis from the third reflecting surface of the reflecting member to the imaging surface, Lf is the distance along the first optical axis from the second reflecting surface of the first lens group to the third reflecting surface of the reflecting member, and Lr is the distance along the second optical axis from the third reflecting surface of the reflecting member to the imaging surface.

[0171] d is the distance along the first optical axis from the object side surface of the first lens to the image side surface of the second lens, and Ph is the sum of the distance along the first optical axis from the entrance surface of the reflecting member to the third reflecting surface and the distance along the second optical axis from the third reflecting surface of the reflecting member to the exit surface.

[0172] TTL is the sum of Lf and Lr, and BFL is the distance along the second optical axis from the image side surface of the last lens of the second lens group to the imaging surface.

[0173] Figure 8 A plan view of the first lens of an exemplary optical imaging system is shown. H S represents the minor or diameter of the lens, and H P represents the major or diameter of the lens.

[0174] While the present disclosure includes specific implementations, it will be apparent to those skilled in the art after understanding the disclosure provided herein that various changes in form and details can be made without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects in each example are to be considered applicable to similar features or aspects in other examples. Suitable results can be achieved if the described techniques are performed in a different order, and / or if components in the described systems, architectures, devices, or circuits are combined in a different manner, and / or replaced or supplemented by other components or their equivalents.

[0175] Thus, in addition to the above and all disclosure of the drawings, the scope of the present disclosure also includes the claims and their equivalents, i.e., all variations within the scope of the claims and their equivalents will be interpreted as included in the present disclosure.

Claims

1. An optical imaging system, characterized in that: Comprising: A first lens group, including a first lens and a second lens arranged along a first optical axis, and having at least two reflecting surfaces; A second lens group, including a plurality of lenses arranged along a second optical axis, and spaced apart from the first lens group; And A reflecting member, disposed between the first lens group and the second lens group, wherein the at least two reflecting surfaces include a first reflecting surface provided on the image side surface of the second lens and a second reflecting surface provided on the object side surface of the first lens, wherein the object side surface of the first lens includes a first refracting surface that extends outward from the second reflecting surface, wherein the image side surface of the second lens includes a second refracting surface that is provided inward from the first reflecting surface, wherein the reflecting member includes a third reflecting surface, and wherein the condition expression f1G / fT < 0.9 is satisfied, where f1G is the focal length of the first lens group and fT is the total focal length of the optical imaging system.

2. The optical imaging system according to claim 1, wherein: The first lens group has a positive refractive power, and the second lens group has a negative refractive power.

3. The optical imaging system according to claim 1, wherein: The condition expression f1G > 0 and Rp < 0 are satisfied, where Rp is the radius of curvature of the first reflecting surface of the second lens of the first lens group.

4. The optical imaging system according to claim 1, wherein: The condition expression 2mm < d < 3mm is satisfied, where d is the distance along the first optical axis from the object side surface of the first lens of the first lens group to the image side surface of the second lens of the first lens group.

5. The optical imaging system according to claim 1, wherein: The condition expression 0.2 < |(2×d) / Rp| < 0.6 is satisfied, where d is the distance along the first optical axis from the object side surface of the first lens of the first lens group to the image side surface of the second lens of the first lens group, and Rp is the radius of curvature of the first reflecting surface of the second lens of the first lens group.

6. The optical imaging system according to claim 1, wherein: The condition expression 0.4 < Hs / Hp < 0.6 is satisfied, where Hp is the effective diameter of the object side surface of the first lens of the first lens group, and Hs is the effective diameter of the second reflecting surface of the first lens of the first lens group.

7. The optical imaging system according to claim 1, wherein: The reflecting member further includes an incident surface and an exit surface, and the third reflecting surface is disposed between the incident surface and the exit surface, and wherein the condition expression 0.4 < d / Ph < 0.8 is satisfied, where d is the distance along the first optical axis from the object side surface of the first lens of the first lens group to the image side surface of the second lens of the first lens group, and Ph is the sum of the distance along the first optical axis from the incident surface to the third reflecting surface and the distance along the second optical axis from the third reflecting surface to the exit surface.

8. The optical imaging system according to claim 1, wherein: The condition expression L / fT < 0.8 is satisfied, where L is the sum of the distance along the second optical axis from the third reflecting surface to the imaging surface disposed on the second optical axis and the effective radius of the first lens.

9. The optical imaging system according to claim 1, wherein: The condition expression 0.5 < Rs / Rp < 1.3 is satisfied, where Rs is the radius of curvature of the second reflecting surface of the first lens of the first lens group, and Rp is the radius of curvature of the first reflecting surface of the second lens of the first lens group.

10. The optical imaging system according to claim 1, wherein: The condition expression 1 < f1G / Rp < 2.3 is satisfied, where Rp is the radius of curvature of the first reflecting surface of the second lens of the first lens group.

11. The optical imaging system according to claim 1, wherein: The condition expression 0.1 < Lf / fT < 0.7 is satisfied, where Lf is the distance along the first optical axis from the second reflecting surface of the first lens of the first lens group to the third reflecting surface of the reflecting member.

12. The optical imaging system according to claim 1, wherein: The condition expression 0.2 < Lf / Lr < 0.5 is satisfied, where Lf is the distance along the first optical axis from the second reflecting surface of the first lens of the first lens group to the third reflecting surface of the reflecting member, and Lr is the distance along the second optical axis from the third reflecting surface of the reflecting member to the imaging surface.

13. The optical imaging system according to claim 1, wherein: The first lens has a negative refractive power, and the second lens has a positive refractive power.

14. The optical imaging system according to claim 1, wherein: The plurality of lenses of the second lens group include a third lens, a fourth lens, and a fifth lens arranged in sequence along the second optical axis, and wherein the fifth lens has a positive refractive power.

Images