Optical image capturing system

Abstract

The present disclosure relates to an optical imaging system including: a reflective member having a reflective surface for changing a path of light; a first lens group disposed on a front side of the reflective member and including one or more lenses; and a second lens group disposed on a rear side of the reflective member and including a plurality of lenses. Each of the first lens group and the second lens group has positive refractive power. An object-side surface of a foremost lens disposed closest to the object side among the one or more lenses of the first lens group is convex. The requirement of 0.5 lt is met; fG1 / fG2lt, fG1 / fG2lt; 2.5, where fG1 is the focal length of the first lens group, and fG2 is the focal length of the second lens group.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority from Korean Patent Application No. 10-2023-0187415 filed on December 20, 2023, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety for all purposes by reference. Technical Field

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

[0004] The portable terminal may include a camera having an optical imaging system with multiple lenses, thereby enabling video calling and image capture.

[0005] Portable terminals with cameras may be miniaturized, requiring development of corresponding optical imaging systems with high resolution.

[0006] In order to realize a camera with telephoto characteristics for a portable terminal, the optical axes of multiple lenses can be set to be parallel to the length direction or width direction of the portable terminal, and a reflective member can be set on the front side of the multiple lenses so that the total track length of the optical imaging system does not affect the thickness of the portable terminal.

[0007] However, in this structure, as the diameters of the plurality of lenses increase, the thickness of the portable terminal may also undesirably increase.

[0008] The above information is presented as background information only to assist in understanding the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above content may be applicable as prior art with respect to the present disclosure. Utility Model Content

[0009] This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

[0010] In one general aspect, an optical imaging system includes a reflecting member having a reflecting surface for changing a path of light, a first lens group disposed at a front side of the reflecting member and including one or more lenses, and a second lens group disposed at a rear side of the reflecting member and including a plurality of lenses. Each of the first lens group and the second lens group has a positive refractive power. An object side surface of a frontmost lens of the one or more lenses of the first lens group that is disposed closest to an object side is convex. 0.5 < fG1 / fG2 < 2.5 is satisfied, where fG1 is a focal length of the first lens group, and fG2 is a focal length of the second lens group.

[0011] The reflecting member and the first lens group can be configured to rotate with respect to two axes that are perpendicular to each other.

[0012] One of the two axes can be an optical axis of the first lens group or an axis parallel to the optical axis of the first lens group.

[0013] The reflecting member can include an entrance surface into which light is incident and an exit surface from which light is emitted, and the reflecting surface can be disposed between the entrance surface and the exit surface. An effective diameter of the object side surface of the frontmost lens of the first lens group and an effective diameter of an image side surface of the frontmost lens of the first lens group can be greater than a minor axis length of the entrance surface of the reflecting member.

[0014] The optical imaging system can satisfy 0.4 < R1 / R2 < 0.9, where R1 is a radius of curvature of the object side surface of the frontmost lens of the first lens group, and R2 is a radius of curvature of the image side surface of the frontmost lens of the first lens group.

[0015] The optical imaging system can satisfy -0.3 < (R1-R2) / (R1+R2) < 0.

[0016] The optical imaging system can satisfy 1 < SAG11 / SAG12 < 2.5, where SAG11 is a SAG value at an effective diameter end of the object side surface of the frontmost lens of the first lens group, and SAG12 is a SAG value at an effective diameter end of the image side surface of the frontmost lens of the first lens group.

[0017] The optical imaging system can satisfy 1 < fG1 / f < 3, where f is a total focal length of the optical imaging system.

[0018] The optical imaging system can satisfy 1 < CA_L11 / CA_L21 < 3, where CA_L11 is an effective diameter of the object side surface of the frontmost lens of the first lens group, and CA_L21 is an effective diameter of an object side surface of a frontmost lens of the plurality of lenses of the second lens group that is disposed closest to the reflecting member.

[0019] The reflection member can include an incidence surface on which light is incident and an exit surface from which light exits, and a reflection surface can be disposed between the incidence surface and the exit surface, and wherein 1.5 < (Lf + DR) / CA_L21 < 3 can be satisfied, where Lf is a distance from an object side surface of a frontmost lens of the first lens group to the reflection surface, DR is a distance from the incidence surface to the reflection surface, and CA_L21 is an effective diameter of an object side surface of a frontmost lens of the plurality of lenses of the second lens group that is disposed closest to the reflection member.

[0020] The optical imaging system can satisfy 0.5 [mm] < CA_L21 / Fno < 2 [mm], where CA_L21 is an effective diameter of an object side surface of a frontmost lens of the plurality of lenses of the second lens group that is disposed closest to the reflection member, and Fno is an F number of the optical imaging system.

[0021] The reflection member can include an incidence surface on which light is incident and an exit surface from which light exits, and a reflection surface can be disposed between the incidence surface and the exit surface. The optical imaging system can satisfy DP2 / fG2 < 0.4, where DP2 is a distance from the exit surface to an object side surface of a frontmost lens of the plurality of lenses of the second lens group that is disposed closest to the reflection member.

[0022] The optical imaging system can satisfy 3 < fG1 / f2 < 11, where f2 is a focal length of a frontmost lens of the plurality of lenses of the second lens group that is disposed closest to the reflection member.

[0023] The optical imaging system can satisfy -4 < f2 / f3 < 0, where f2 is a focal length of a frontmost lens of the plurality of lenses of the second lens group that is disposed closest to the reflection member, and f3 is a focal length of a lens of the plurality of lenses of the second lens group that is disposed second closest to the reflection member.

[0024] The one or more lenses of the first lens group can include a first lens, and the plurality of lenses of the second lens group can include a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens.

[0025] An image side surface of the first lens can be concave, the second lens can have a positive refractive power, the third lens can have a negative refractive power, and a focal length of the first lens can be greater than a focal length of the second lens.

[0026] In another general aspect, an optical imaging system includes: a reflecting member having a reflecting surface; a first lens group disposed on a front side of the reflecting member and including one or more lenses; and a second lens group disposed on a rear side of the reflecting member and including a plurality of lenses. Each of the first lens group and the second lens group has a positive refractive power, wherein 1 < fG1 / f < 3 is satisfied, where fG1 is a focal length of the first lens group, and f is a total focal length of the optical imaging system, and wherein the optical imaging system has a total of six lenses.

[0027] The reflecting member and the first lens group can be configured to rotate with respect to each other in two axes that are perpendicular to each other.

[0028] One of the two axes can be an optical axis of the first lens group or an axis parallel to the optical axis of the first lens group.

[0029] The optical imaging system can satisfy 0.5 < fG1 / fG2 < 2.5, where fG2 is a focal length of the second lens group.

[0030] Other features and aspects will be apparent from the following specific description, the drawings, and the claims. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a configuration diagram illustrating an optical imaging system according to a first embodiment of the present disclosure.

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

[0033] Figure 3 is a configuration diagram illustrating an optical imaging system according to a third embodiment of the present disclosure.

[0034] Figure 4 is a configuration diagram illustrating an optical imaging system according to a fourth embodiment of the present disclosure.

[0035] Figure 5 is a configuration diagram illustrating an optical imaging system according to a fifth embodiment of the present disclosure.

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

[0037] Figure 7 is a configuration diagram illustrating an optical imaging system according to a seventh embodiment of the present disclosure.

[0038] Figure 8 is a configuration diagram illustrating an optical imaging system according to an eighth embodiment of the present disclosure.

[0039] Throughout the drawings and specific embodiments, identical reference numerals designate identical elements, unless otherwise described. The drawings can not be to scale and the relative dimensions, proportions, and depiction of elements in the drawings can be exaggerated for purpose of clarity, illustration and convenience. DETAILED DESCRIPTION

[0040] Hereinafter, while examples of the present disclosure will be described in detail with reference to the accompanying drawings, it is noted that the examples are not limited thereto.

[0041] The following detailed description is provided to help the reader obtain a thorough understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents thereof will become apparent to those skilled in the art after an understanding of the present disclosure. For example, the order of the operations described herein is merely an example and is not limited to the order set forth herein, but can be changed as will be apparent after an understanding of the present disclosure, except for operations that necessarily occur in a certain order. Also, descriptions of features known in the art can be omitted in order to improve clarity and conciseness.

[0042] The features described herein can be implemented in different forms and are not to be construed as limited to the examples described herein. Rather, the examples described herein have been provided as an example of a number of possible ways of implementing the methods, devices, and / or systems described herein, as will be apparent after an understanding of the present disclosure.

[0043] Throughout the specification, when an element (such as a layer, region, or substrate) is referred to as being "on", "connected to", or "coupled to" another element, it can be directly on, directly connected to, or directly coupled to the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is referred to as being "directly on", "directly connected to", or "directly coupled to" another element, there are no other elements interposed therebetween.

[0044] As used herein, the term "and / or" includes any one of the associated listed items, as well as any combination of any two or more of the associated listed items; likewise, "at least one of" includes any one of the associated listed items, as well as any combination of any two or more of the associated listed items.

[0045] Although terms such as "first," "second," and "third" can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. Instead, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, terms describing the examples described herein, such as a first element, a first component, a first region, a first layer or a first section can also be termed a second element, a second component, a second region, a second layer or a second section without departing from the teachings of the examples.

[0046] For ease of description, spatial relative terms such as "above," "upper," "below," and "lower" can be used herein to describe the relationship of one element to another element as shown in the figures. Such spatial relative terms can be intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as above or upper other elements would then be oriented below or lower other elements. Accordingly, the terms "above" and "below" encompass both orientations of above and below, depending on the spatial orientation of the device. The device can also be oriented in other ways (e.g., rotated 90 degrees or at other orientations) and the spatial relative terms used herein can be interpreted accordingly.

[0047] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the present disclosure. As used herein, the term "one," "a," and "the" are intended to encompass the singular and the plural, unless the context clearly indicates otherwise. The terms "comprising," "including," and "having" are intended to be inclusive and mean that there can be additional such features, numbers, operations, components, elements, and / or combinations thereof in the described examples.

[0048] The shapes shown in the figures can vary due to manufacturing techniques and / or tolerances. Thus, the examples described herein are not limited to the specific shapes shown in the figures, but include variations of the shapes that occur during manufacturing.

[0049] In this document, it is noted that the use of the term "may" with respect to examples means that at least one example exists that includes or implements the feature, but that not all examples must include or implement the feature. It is further noted that the features described in examples can be combined with each other in various ways.

[0050] As will be evident to one of ordinary skill in the art upon reading the disclosure, the features of the examples described herein can be combined in various ways. Further, although the examples described herein have a variety of configurations, other configurations are possible in which the examples are practiced.

[0051] An effective radius of a lens surface is a radius of a portion of the lens surface through which light actually passes, and is not necessarily a radius of an outer edge of the lens surface. An object side surface of a lens and an image side surface of the lens can have different effective radii.

[0052] In other words, an effective radius of a lens surface is a distance between an optical axis of the lens surface and an edge ray of light passing through the lens surface in a direction perpendicular to the optical axis of the lens surface.

[0053] An optical imaging system according to an embodiment can be mounted on a portable electronic device. For example, the optical imaging system can be configured as a component of a camera module mounted on a portable electronic device. The portable electronic device can be implemented as a mobile communication terminal, a smart phone, and a tablet PC.

[0054] In an embodiment, units of values of a radius of curvature, a thickness, a distance, a focal length, etc. can be mm, and a unit of a field of view can be degrees.

[0055] In descriptions related to shapes of lenses of an embodiment, a convex surface can refer to a portion of an on-axis region of the surface being convex, and a concave surface can refer to a portion of an on-axis region of the surface being concave.

[0056] An on-axis region can refer to a very narrow region near an optical axis.

[0057] An imaging plane can refer to a virtual plane on which a focus is formed by an optical imaging system. Alternatively, an imaging plane can refer to a surface of an image sensor on which light is received.

[0058] An optical imaging system according to an embodiment can include a plurality of lens groups. As an example, the optical imaging system can include a first lens group and a second lens group.

[0059] The first lens group can include one or more lenses, and the second lens group can include a plurality of lenses.

[0060] In an embodiment, the first lens group can include a first lens, and the second lens group can include a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens to the sixth lens can be sequentially disposed from an object side.

[0061] When the first lens group includes a plurality of lenses, a frontmost lens of the first lens group can refer to the first lens, and a frontmost lens of the second lens group can refer to a lens of the plurality of lenses of the second lens group disposed closest to the first lens group.

[0062] The plurality of lenses included in the optical imaging system can be spaced apart from each other.

[0063] The frontmost lens of the first lens group can have a positive refractive power, and a subject side surface thereof can be convex. An absolute value of a focal length of the frontmost lens of the second lens group can be smaller than a focal length of the first lens group.

[0064] Among the plurality of lenses of the second lens group, at least three lenses can have a refractive index greater than 1.6. Among the plurality of lenses of the second lens group, at least two lenses can have a refractive index greater than 1.63.

[0065] Among the plurality of lenses of the second lens group, the fifth lens can have the greatest refractive index. In an embodiment, the fifth lens can have a refractive index of 1.66 or greater.

[0066] The optical imaging system can further include a reflection member having a reflection surface for changing a light path. The reflection surface of the reflection member can be configured to change the light path by 90°.

[0067] The reflection member can be disposed between the first lens group and the second lens group. In an embodiment, the reflection member can be disposed between the first lens and the second lens.

[0068] The reflection member can be implemented as a mirror or a prism having a reflection surface.

[0069] When the reflection member is implemented as a prism, the reflection member can have a form in which a rectangular parallelepiped or a cube is diagonally split. The prism can include an incidence surface into which light is incident, a reflection surface configured to reflect light passing through the incidence surface, and an exit surface from which light reflected from the reflection surface exits.

[0070] The reflection member can include three surfaces each having a quadrangular shape and two surfaces each having a triangular shape. For example, each of the incidence surface, the reflection surface, and the exit surface of the reflection member can have a quadrangular shape, and two side surfaces of the reflection member can have a substantially triangular shape.

[0071] An optical axis of the first lens group and an optical axis of the second lens group can be perpendicular to each other. In an embodiment, a direction of the optical axis of the first lens group can be substantially parallel to a thickness direction of a portable terminal in which the optical imaging system is mounted, and a direction of the optical axis of the second lens group can be substantially parallel to a length direction or a width direction of the portable terminal.

[0072] By changing a direction of light via the reflection member, a light path can be elongated in a relatively narrow space.

[0073] For example, light passing through the first lens can pass through the incidence surface of the reflection member, a light path of the light can be changed by 90° on the reflection surface, the light can pass through the exit surface of the reflection member, and can be incident to the second lens.

[0074] Accordingly, the optical imaging system can have a relatively long focal length while having a reduced size.

[0075] According to an embodiment, the optical imaging system can have characteristics of a telephoto lens having a relatively narrow field of view and a relatively long focal length.

[0076] In order to reduce the size of the portable terminal and the optical imaging system, it can be desirable to reduce the diameter of the lens located between the reflection member and the image sensor. However, as the diameter of the lens is reduced, the Fno (F number of the optical imaging system) increases, and the image can become dark.

[0077] Accordingly, the optical imaging system according to an embodiment can reduce the Fno by disposing the first lens group having a positive refractive power at the front side of the reflection member. In addition, the effective diameter of the object side surface and the effective diameter of the image side surface of the lens included in the first lens group can be greater than the short axis length of the entrance surface of the reflection member.

[0078] The lens included in the first lens group can have a substantially circular shape when viewed in the direction of the optical axis of the first lens group.

[0079] The reflection member can be disposed at the front side of the second lens group. The reflection member can be rotated with respect to two axes for image stabilization during photographing.

[0080] In other words, when a shake occurs due to factors such as hand jitter of a user when acquiring an image or a video, image stabilization can be performed by rotating the reflection member in response to the shake.

[0081] In an embodiment, the reflection member can be rotated using the optical axis (or an axis parallel to the optical axis) of the first lens group as a rotation axis (yaw axis), and can be rotated using an axis perpendicular to both the optical axis of the first lens group and the optical axis (or an axis parallel to the optical axis) of the second lens group as a rotation axis (pitch axis).

[0082] Since the first lens group having a positive refractive power is disposed at the front side of the reflection member, light incident to the reflection member can be converged, and thus the diameter of the second lens group can be configured to be small. Accordingly, the height of the optical imaging system can be reduced, and the Fno of the optical imaging system can also be reduced.

[0083] In addition, the first lens group can be rotated together with the reflection member.

[0084] The optical imaging system can further include an image sensor for converting an image of an incident object into an electrical signal.

[0085] In addition, the optical imaging system can further include an infrared cut filter (hereinafter, referred to as a filter) to block infrared light. The filter can be disposed between the second lens group and the imaging surface.

[0086] Further, the optical imaging system can further include an aperture for controlling the amount of light.

[0087] The effective radius of the first lens can be greater than the effective radius of the other lenses. In other words, among the first to sixth lenses, the effective radius of the first lens can be the greatest.

[0088] The first lens can have a shape different from the shapes of the other lenses. For example, when viewed in the direction of the optical axis of the first lens, the first lens can have a substantially circular shape. One or more lenses among the second to sixth lenses can have a non-circular shape. For example, the non-circular lens can have a length in a first axis (horizontal axis) direction perpendicular to the optical axis that is greater than a length in a second axis (vertical axis) direction perpendicular to both the optical axis and the first axis (horizontal axis) direction. Accordingly, the ratio of the length of the non-circular lens in the second axis (vertical axis) direction to the length in the first axis (horizontal axis) direction can be greater than 0.5 and less than 1.

[0089] Here, the first axis (horizontal axis) direction can be a direction in which a long side of the image sensor extends, and the second axis (vertical axis) direction can be a direction in which a short side of the image sensor extends.

[0090] The non-circular lens can have a length in the first axis (horizontal axis) direction that is greater than a length in the second axis (vertical axis) direction, such that the effective radius in the first axis (horizontal axis) direction can be greater than the effective radius in the second axis (vertical axis) direction.

[0091] In an embodiment, the first to sixth lenses can be formed of a plastic material.

[0092] In an embodiment, the object side surface and the image side surface of the lens included in the first lens group can be aspherical.

[0093] In an embodiment, the object side surface and the image side surface of one or more lenses among the plurality of lenses included in the second lens group can be aspherical.

[0094] Here, the aspheric surface of each lens can be expressed as Equation 1.

[0095] Equation 1:

[0096]

[0097] In Equation 1, c can be a curvature of a lens surface (an inverse of a radius of curvature), K can be a conic constant, and Y can be a distance from an optical axis to an arbitrary point on an aspherical surface of a lens. Also, constants A-H, J, and L to P can be aspherical surface coefficients. Z (also referred to as sag (SAG)) can be a distance in an optical axis direction between an arbitrary point on an aspherical surface of a lens and a vertex of the aspherical surface.

[0098] According to embodiments, the optical imaging system can satisfy one or more of the following conditional expressions.

[0099] In an embodiment, the optical imaging system can satisfy a conditional expression 0.4 < R1 / R2 < 0.9. Here, R1 can be a radius of curvature of an object side surface of a frontmost lens (e.g., a first lens) of the first lens group, and R2 can be a radius of curvature of an image side surface of the frontmost lens (e.g., the first lens) of the first lens group. Accordingly, a change in an optical path length due to rotation of the first lens group during image stabilization can be reduced, and image stabilization performance can be improved.

[0100] In an embodiment, the optical imaging system can satisfy a conditional expression 1 < SAG11 / SAG12 < 2.5. Here, SAG11 can be a SAG value at an effective diameter end of an object side surface of the first lens, and SAG12 can be a SAG value at an effective diameter end of an image side surface of the first lens. Accordingly, a change in an optical path length due to rotation of the first lens group during image stabilization can be reduced, and image stabilization performance can be improved.

[0101] When the SAG value has a positive value, the effective diameter end of the corresponding lens surface can be positioned closer to the image side than the vertex of the corresponding lens surface.

[0102] When the SAG value has a negative value, the effective diameter end of the lens surface can be positioned closer to the object side than the vertex of the lens surface.

[0103] In an embodiment, the optical imaging system can satisfy a conditional expression 1 < fG1 / f < 3. Here, fG1 can be a focal length of the first lens group, and f can be a total focal length of the optical imaging system. Accordingly, optimizing the focal length of the first lens group having positive refractive power can reduce a diameter of a lens included in the second lens group.

[0104] In an embodiment, the optical imaging system can satisfy a conditional expression 0.5 < fG1 / fG2 < 2.5. Here, fG2 can be a focal length of the second lens group. Accordingly, by appropriately distributing refractive power of each lens group, the optical imaging system can have a reduced size, and resolution can be improved.

[0105] In an embodiment, the optical imaging system can satisfy a conditional expression 1 < CA_L11 / CA_L21 < 3. Here, CA_L11 can be an effective diameter of a frontmost lens (e.g., a first lens) of the first lens group, and CA_L21 can be an effective diameter of a frontmost lens (e.g., a second lens) of the second lens group in a second axis (vertical axis) direction. Accordingly, image brightness can be improved, and a size of the optical imaging system can be reduced.

[0106] In an embodiment, the optical imaging system can satisfy a conditional expression 1.5 < (Lf+DR) / CA_L21 < 3. Here, Lf can be a distance from an object side surface of a frontmost lens (e.g., a first lens) of the first lens group to a reflection surface of the reflection member, and DR can be a distance from an incident surface of the reflection member to the reflection surface of the reflection member (or a distance from the reflection surface to an exit surface). Accordingly, a thickness of the optical imaging system can be prevented from excessively increasing in the optical axis direction of the first lens group.

[0107] In an embodiment, the optical imaging system can satisfy a conditional expression 0.5 [mm] < CA_L21 / Fno < 2 [mm]. Here, Fno can be an F number of the optical imaging system. Accordingly, image brightness can be improved, and a size of the optical imaging system can be reduced.

[0108] In an embodiment, the optical imaging system can satisfy a conditional expression DP2 / fG2 < 0.4. Here, DP2 can be a distance from an exit surface of the reflection member to an object side surface of a frontmost lens (e.g., a second lens) of the second lens group. Accordingly, interference between the reflection member and the second lens group when the reflection member rotates can be prevented. In addition, a space for the second lens group to move in the optical axis direction of the second lens group to perform focus adjustment can be secured.

[0109] In an embodiment, the optical imaging system can satisfy a conditional expression 3 < fG1 / f2 < 11. Here, f2 can be a focal length of a frontmost lens (e.g., a second lens) of the second lens group. Accordingly, aberration can be reduced, and the optical imaging system can also have sufficient telephoto performance.

[0110] In an embodiment, the optical imaging system can satisfy a conditional expression 3 < f1 / f2 < 11. Here, f1 can be a focal length of a frontmost lens (e.g., a first lens) of the first lens group, and f2 can be a focal length of a frontmost lens (e.g., a second lens) of the second lens group. Accordingly, aberration can be reduced, and the optical imaging system can also have sufficient telephoto performance.

[0111] In an embodiment, the optical imaging system may satisfy the conditional expression -4 <f2 / f3<0。这里,f3可以是与第二透镜组的最前透镜相邻设置的透镜(例如,第三透镜)的焦距。因此,可以减小像差,并且光学成像系统也可以具有足够的远摄性能。

[0112] In an embodiment, the optical imaging system may satisfy a conditional expression of −0.3<( R1 − R2 ) / ( R1 + R2 )< 0. Therefore, spherical aberration occurring in the first lens group may be reduced.

[0113] In an embodiment, the optical imaging system may satisfy the conditional expression 0.2 <Lf / Lr<0.4。这里,Lr可以是从反射构件的反射面到成像面的距离。因此,光学成像系统可以具有减小的尺寸。

[0114] Figure 1 : is a diagram showing a configuration of an optical imaging system according to a first embodiment. The optical imaging system according to the first embodiment can be referred to Figure 1 Provide a description.

[0115] The optical imaging system according to the first embodiment may include a first lens group G1 and a second lens group G2 . The optical imaging system may include a reflective member P disposed between the first lens group G1 and the second lens group G2 .

[0116] The first lens group G1 may include a first lens 110 , and the second lens group G2 may include a second lens 120 , a third lens 130 , a fourth lens 140 , a fifth lens 150 , and a sixth lens 160 in order from the object side.

[0117] In addition, the optical imaging system may further include an optical filter 170 and an image sensor.

[0118] The optical imaging system according to the first embodiment can form a focus on an imaging surface 180. The imaging surface 180 may refer to a surface on which the optical imaging system forms a focus. As an example, the imaging surface 180 may refer to a surface of an image sensor that receives light.

[0119] The reflective member P may be implemented as a prism, or may be provided as a reflecting mirror.

[0120] The lens characteristics of each lens (curvature radius, thickness of the lens or distance between lenses, refractive index, Abbe number, and focal length) are shown in Table 1.

[0121] Table 1:

[0122]

[0123]

[0124] Table 2:

[0125]

[0126] Table 2 lists the effective radius in the first axis (horizontal axis) direction and the effective radius in the second axis (vertical axis) direction of each of the first lens 110 to the sixth lens 160. The first axis (horizontal axis) direction and the second axis (vertical axis) direction can refer to two directions perpendicular to the optical axis of each lens and perpendicular to each other. For example, the optical axis of the first lens 110 and the optical axis of the second lens 120 can be perpendicular to each other, so that the first axis (horizontal axis) direction of the first lens 110 and the first axis (horizontal axis) direction of the second lens 210 can be different from each other.

[0127] The first lens 110 and the fourth lens 140 can have the same effective radius in the first axis (horizontal axis) direction and the same effective radius in the second axis (vertical axis) direction.

[0128] The effective radius in the first axis (horizontal axis) direction of the object side surface and the image side surface of each of the second lens 120 and the sixth lens 160 can be greater than the effective radius in the second axis (vertical axis) direction.

[0129] The effective radius in the first axis (horizontal axis) direction of the object side surface of the third lens 130 can be greater than the effective radius in the second axis (vertical axis) direction. The image side surface of the third lens 130 can have the same effective radius in the first axis (horizontal axis) direction and the same effective radius in the second axis (vertical axis) direction.

[0130] The object side surface of the fifth lens 150 can have the same effective radius in the first axis (horizontal axis) direction and the same effective radius in the second axis (vertical axis) direction. The effective radius in the first axis (horizontal axis) direction of the image side surface of the fifth lens 150 can be greater than the effective radius in the second axis (vertical axis) direction.

[0131] In the first embodiment, the first lens group G1 can have a positive refractive power as a whole, and the second lens group G2 can have a positive refractive power as a whole.

[0132] The effective radius of the object side surface of the first lens 110 of the first lens group G1 can be greater than the effective radius of the image side surface.

[0133] The first lens 110 can have a positive refractive power, the object side surface of the first lens 110 can be convex, and the image side surface of the first lens 110 can be concave.

[0134] The second lens 120 can have a positive refractive power, and object and image sides of the second lens 120 can be convex.

[0135] The third lens 130 can have a negative refractive power, and object and image sides of the third lens 130 can be concave.

[0136] The fourth lens 140 can have a negative refractive power, and object and image sides of the fourth lens 140 can be concave.

[0137] The fifth lens 150 can have a positive refractive power, an object side of the fifth lens 150 can be concave, and an image side of the fifth lens 150 can be convex.

[0138] The sixth lens 160 can have a positive refractive power, and object and image sides of the sixth lens 160 can be convex.

[0139] An aperture can be disposed between the second lens 120 and the third lens 130.

[0140] Each surface of the first lens 110 to the sixth lens 160 can have an aspheric coefficient as shown in Table 3. For example, object and image sides of each of the first lens 110 to the sixth lens 160 can be aspheric.

[0141] Table 3:

[0142]

[0143]

[0144] Figure 2 FIG. 2 is a configuration diagram illustrating an optical imaging system according to a second embodiment. The optical imaging system according to the second embodiment can be described with reference to FIG. 1. Figure 2

[0145] The optical imaging system according to the second embodiment can include a first lens group G1 and a second lens group G2. The optical imaging system can include a reflection member P disposed between the first lens group G1 and the second lens group G2.

[0146] The first lens group G1 can include a first lens 210, and the second lens group G2 can include, in order from an object side, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, and a sixth lens 260.

[0147] In addition, the optical imaging system can further include a filter 270 and an image sensor.

[0148] ​The optical imaging system according to the second embodiment can form a focal point on an imaging surface 280. The imaging surface 280 can refer to a surface on which the optical imaging system forms a focal point. As an example, the imaging surface 280 can refer to one surface of an image sensor on which light is received.

[0149] The reflection member P can be implemented as a prism, or can be provided as a mirror.

[0150] The lens properties (radius of curvature, thickness of the lens or distance between the lenses, refractive index, Abbe number, and focal length) of each lens are as shown in Table 4.

[0151] Table 4:

[0152]

[0153]

[0154] Table 5:

[0155]

[0156] Table 5 lists the effective radius in the first axis (horizontal axis) direction and the effective radius in the second axis (vertical axis) direction of each of the first lens 210 to the sixth lens 260. The first axis (horizontal axis) direction and the second axis (vertical axis) direction can refer to two directions that are perpendicular to the optical axis of each lens and perpendicular to each other.

[0157] The first lens 210 and the fourth lens 240 can have the same effective radius in the first axis (horizontal axis) direction and the same effective radius in the second axis (vertical axis) direction.

[0158] The effective radius in the first axis (horizontal axis) direction of the object side surface and the image side surface of each of the second lens 220 and the sixth lens 260 can be greater than the effective radius in the second axis (vertical axis) direction.

[0159] The effective radius in the first axis (horizontal axis) direction of the object side surface of the third lens 230 can be greater than the effective radius in the second axis (vertical axis) direction. The image side surface of the third lens 230 can have the same effective radius in the first axis (horizontal axis) direction and the same effective radius in the second axis (vertical axis) direction.

[0160] The object side surface of the fifth lens 250 can have the same effective radius in the first axis (horizontal axis) direction and the same effective radius in the second axis (vertical axis) direction. The effective radius in the first axis (horizontal axis) direction of the image side surface of the fifth lens 250 can be greater than the effective radius in the second axis (vertical axis) direction.

[0161] In the second embodiment, the first lens group G1 can have a positive refractive power as a whole, and the second lens group G2 can have a positive refractive power as a whole.

[0162] An effective radius of the object side surface of the first lens 210 of the first lens group G1 can be greater than an effective radius of the image side surface.

[0163] The first lens 210 can have a positive refractive power, the object side surface of the first lens 210 can be convex, and the image side surface of the first lens 210 can be concave.

[0164] The second lens 220 can have a positive refractive power, and the object side surface and the image side surface of the second lens 220 can be convex.

[0165] The third lens 230 can have a negative refractive power, and the object side surface and the image side surface of the third lens 230 can be concave.

[0166] The fourth lens 240 can have a negative refractive power, and the object side surface and the image side surface of the fourth lens 240 can be concave.

[0167] The fifth lens 250 can have a positive refractive power, the object side surface of the fifth lens 250 can be concave, and the image side surface of the fifth lens 250 can be convex.

[0168] The sixth lens 260 can have a positive refractive power, and the object side surface and the image side surface of the sixth lens 260 can be convex.

[0169] The aperture can be disposed between the second lens 220 and the third lens 230.

[0170] Each surface of the first lens 210 to the sixth lens 260 can have an aspheric coefficient as shown in Table 6. For example, the object side surface and the image side surface of each of the first lens 110 to the sixth lens 160 can be aspheric.

[0171] Table 6:

[0172]

[0173]

[0174] Figure 3 is a configuration diagram illustrating an optical imaging system according to a third embodiment. The optical imaging system according to the third embodiment can be described with reference to Figure 3 .

[0175] The optical imaging system according to the third embodiment can include a first lens group G1 and a second lens group G2. The optical imaging system can include a reflection member P disposed between the first lens group G1 and the second lens group G2.

[0176] The first lens group G1 can include the first lens 310, and the second lens group G2 can include, in order from the object side, the second lens 320, the third lens 330, the fourth lens 340, the fifth lens 350, and the sixth lens 360.

[0177] In addition, the optical imaging system can further include a filter 370 and an image sensor.

[0178] The optical imaging system according to the third embodiment can form a focal point on an imaging surface 380. The imaging surface 380 can refer to a surface on which the optical imaging system forms a focal point. As an example, the imaging surface 380 can refer to one surface of the image sensor on which light is received.

[0179] The reflection member P can be implemented as a prism, or can be provided as a mirror.

[0180] The lens properties (radius of curvature, thickness of the lens or distance between the lenses, refractive index, Abbe number, and focal length) of each lens are as shown in Table 7.

[0181] Table 7:

[0182]

[0183]

[0184] Table 8:

[0185]

[0186] Table 8 lists the effective radius of each of the first lens 310 to the sixth lens 360 in the first axis (horizontal axis) direction and the effective radius in the second axis (vertical axis) direction. The first axis (horizontal axis) direction and the second axis (vertical axis) direction can refer to two directions that are perpendicular to the optical axis of each lens and perpendicular to each other.

[0187] The first lens 310, the third lens 330, and the fourth lens 340 can have the same effective radius in the first axis (horizontal axis) direction and the same effective radius in the second axis (vertical axis) direction.

[0188] The effective radius of the object side surface and the image side surface of each of the second lens 320 and the sixth lens 360 in the first axis (horizontal axis) direction can be greater than the effective radius in the second axis (vertical axis) direction.

[0189] The object side surface of the fifth lens 350 can have the same effective radius in the first axis (horizontal axis) direction and the same effective radius in the second axis (vertical axis) direction. The effective radius of the image side surface of the fifth lens 350 in the first axis (horizontal axis) direction can be larger than the effective radius in the second axis (vertical axis) direction.

[0190] In the third embodiment, the first lens group G1 can have a positive refractive power as a whole, and the second lens group G2 can have a positive refractive power as a whole.

[0191] The effective radius of the object side surface of the first lens 310 of the first lens group G1 can be larger than the effective radius of the image side surface.

[0192] The first lens 310 can have a positive refractive power, the object side surface of the first lens 310 can be convex, and the image side surface of the first lens 310 can be concave.

[0193] The second lens 320 can have a positive refractive power, and the object side surface and the image side surface of the second lens 320 can be convex.

[0194] The third lens 330 can have a negative refractive power, and the object side surface and the image side surface of the third lens 330 can be concave.

[0195] The fourth lens 340 can have a negative refractive power, and the object side surface and the image side surface of the fourth lens 340 can be concave.

[0196] The fifth lens 350 can have a positive refractive power, the object side surface of the fifth lens 350 can be concave, and the image side surface of the fifth lens 350 can be convex.

[0197] The sixth lens 360 can have a positive refractive power, and the object side surface and the image side surface of the sixth lens 360 can be convex.

[0198] The aperture can be disposed between the exit surface of the reflection member P and the second lens 320.

[0199] Each surface of the first lens 310 to the sixth lens 360 can have an aspheric coefficient as shown in Table 9. For example, the object side surface and the image side surface of each of the first lens 310 to the sixth lens 360 can be aspheric.

[0200] Table 9:

[0201]

[0202]

[0203] Figure 4is a configuration diagram illustrating an optical imaging system according to a fourth embodiment. The optical imaging system according to the fourth embodiment can be described with reference to Figure 4

[0204] The optical imaging system according to the fourth embodiment can include a first lens group G1 and a second lens group G2. The optical imaging system can include a reflection member P disposed between the first lens group G1 and the second lens group G2.

[0205] The first lens group G1 can include a first lens 410, and the second lens group G2 can include, in order from an object side, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, and a sixth lens 460.

[0206] In addition, the optical imaging system can further include a filter 470 and an image sensor.

[0207] The optical imaging system according to the fourth embodiment can form a focal point on an imaging surface 480. The imaging surface 480 can refer to a surface on which the optical imaging system forms a focal point. As an example, the imaging surface 480 can refer to one surface of the image sensor on which light is received.

[0208] The reflection member P can be implemented as a prism, or can be provided as a mirror.

[0209] The lens properties (radius of curvature, thickness of a lens or distance between lenses, refractive index, Abbe number, and focal length) of each lens are as shown in Table 10.

[0210] Table 10:

[0211] Face No. Element Radius of Curvature Thickness or Distance Refractive Index Abbe Number Focal Length S1 First Lens 7.775 1.200 1.535 55.7 37.5 S2 11.979 2.000 S3 Prism Infinity 2.250 1.785 25.7 S4 Infinity 2.250 1.785 25.7 S5 Infinity 3.559 S6 Second Lens 3.414 1.285 1.535 55.7 5.913 S7 -39.711 0.270 S8 Third Lens -10.000 0.876 1.614 25.9 -3.375 S9 2.735 0.479 S10 Fourth Lens 16.409 0.532 1.544 56.0 56.624 S11 34.545 0.284 S12 Fifth Lens -91.199 0.852 1.661 20.4 7.884 S13 -5.000 0.100 S14 Sixth Lens -19.935 0.500 1.639 23.5 -28.320 S15 222.685 4.838 S16 Filter Infinity 0.210 1.517 64.2 S17 Infinity 3.900 S18 Imaging Surface Infinity

[0212] Table 11:

[0213]

[0214]

[0215] Table 11 lists the effective radius of each of the first lens 410 to the sixth lens 460 in the first axis (horizontal axis) direction and the effective radius in the second axis (vertical axis) direction. The first axis (horizontal axis) direction and the second axis (vertical axis) direction can refer to two directions that are perpendicular to the optical axis of each lens and perpendicular to each other.

[0216] The first lens 410, the third lens 430, and the fourth lens 440 can have the same effective radius in the first axis (horizontal axis) direction and the same effective radius in the second axis (vertical axis) direction.

[0217] ​The effective radius of each of the object side surface and the image side surface of the second lens 420 and the sixth lens 460 in the first axis (horizontal axis) direction can be greater than the effective radius in the second axis (vertical axis) direction.

[0218] The object side surface of the fifth lens 450 can have the same effective radius in the first axis (horizontal axis) direction and the same effective radius in the second axis (vertical axis) direction. The effective radius of the image side surface of the fifth lens 450 in the first axis (horizontal axis) direction can be greater than the effective radius in the second axis (vertical axis) direction.

[0219] In the fourth embodiment, the first lens group G1 can have a positive refractive power as a whole, and the second lens group G2 can have a positive refractive power as a whole.

[0220] The effective radius of the object side surface of the first lens 410 of the first lens group G1 can be greater than the effective radius of the image side surface.

[0221] The first lens 410 can have a positive refractive power, the object side surface of the first lens 410 can be convex, and the image side surface of the first lens 410 can be concave.

[0222] The second lens 420 can have a positive refractive power, and the object side surface and the image side surface of the second lens 420 can be convex.

[0223] The third lens 430 can have a negative refractive power, and the object side surface and the image side surface of the third lens 430 can be concave.

[0224] The fourth lens 440 can have a positive refractive power, the object side surface of the fourth lens 440 can be convex, and the image side surface of the fourth lens 440 can be concave.

[0225] The fifth lens 450 can have a positive refractive power, the object side surface of the fifth lens 450 can be concave, and the image side surface of the fifth lens 450 can be convex.

[0226] The sixth lens 460 can have a negative refractive power, and the object side surface and the image side surface of the sixth lens 460 can be concave.

[0227] An aperture can be disposed between the exit surface of the reflection member P and the second lens 420.

[0228] Each surface of the first lens 410 to the sixth lens 460 can have an asphericity coefficient as shown in Table 12. For example, the object side surface and the image side surface of each of the first lens 410 to the sixth lens 460 can be aspheric.

[0229] Table 12:

[0230]

[0231]

[0232] Figure 5 is a configuration diagram illustrating an optical imaging system according to a fifth embodiment. The optical imaging system according to the fifth embodiment can be described with reference to Figure 5 .

[0233] The optical imaging system according to the fifth embodiment can include a first lens group G1 and a second lens group G2. The optical imaging system can include a reflection member P disposed between the first lens group G1 and the second lens group G2.

[0234] The first lens group G1 can include a first lens 510, and the second lens group G2 can include, in order from the object side, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, and a sixth lens 560.

[0235] In addition, the optical imaging system can further include a filter 570 and an image sensor.

[0236] The optical imaging system according to the fifth embodiment can form a focal point on an imaging surface 580. The imaging surface 580 can refer to a surface on which the optical imaging system forms a focal point. As an example, the imaging surface 580 can refer to one surface of the image sensor on which light is received.

[0237] The reflection member P can be implemented as a prism, or can be provided as a mirror.

[0238] The lens properties (radius of curvature, thickness of the lens or distance between the lenses, refractive index, Abbe number, and focal length) of each lens are as shown in Table 13.

[0239] Table 13:

[0240]

[0241]

[0242] Table 14:

[0243]

[0244] Table 14 lists the effective radius of each of the first lens 510 to the sixth lens 560 in the first axis (horizontal axis) direction and the effective radius in the second axis (vertical axis) direction. The first axis (horizontal axis) direction and the second axis (vertical axis) direction can refer to two directions perpendicular to the optical axis of each lens and perpendicular to each other.

[0245] The first lens 510 and the fourth lens 540 can have the same effective radius in the first axis (horizontal axis) direction and the same effective radius in the second axis (vertical axis) direction.

[0246] The object side surface and the image side surface of each of the second lens 520 and the sixth lens 560 can have a larger effective radius in the first axis (horizontal axis) direction than in the second axis (vertical axis) direction.

[0247] The object side surface of the third lens 530 can have a larger effective radius in the first axis (horizontal axis) direction than in the second axis (vertical axis) direction. The image side surface of the third lens 530 can have the same effective radius in the first axis (horizontal axis) direction and the same effective radius in the second axis (vertical axis) direction.

[0248] The object side surface of the fifth lens 550 can have the same effective radius in the first axis (horizontal axis) direction and the same effective radius in the second axis (vertical axis) direction. The image side surface of the fifth lens 550 can have a larger effective radius in the first axis (horizontal axis) direction than in the second axis (vertical axis) direction.

[0249] In the fifth embodiment, the first lens group G1 can have a positive refractive power as a whole, and the second lens group G2 can have a positive refractive power as a whole.

[0250] The effective radius of the object side surface of the first lens 510 of the first lens group G1 can be larger than the effective radius of the image side surface.

[0251] The first lens 510 can have a positive refractive power, the object side surface of the first lens 510 can be convex, and the image side surface of the first lens 510 can be concave.

[0252] The second lens 520 can have a positive refractive power, and the object side surface and the image side surface of the second lens 520 can be convex.

[0253] The third lens 530 can have a negative refractive power, and the object side surface and the image side surface of the third lens 530 can be concave.

[0254] The fourth lens 540 can have a positive refractive power, the object side surface of the fourth lens 540 can be convex, and the image side surface of the fourth lens 540 can be concave.

[0255] The fifth lens 550 can have a positive refractive power, and the object side surface and the image side surface of the fifth lens 550 can be convex.

[0256] The sixth lens 560 can have a negative refractive power, and the object side surface and the image side surface of the sixth lens 560 can be concave.

[0257] An aperture can be disposed between the second lens 520 and the third lens 530.

[0258] Each surface of the first lens 510 to the sixth lens 560 can have an aspheric coefficient as shown in Table 15. For example, the object side surface and the image side surface of each of the first lens 510 to the sixth lens 560 can be aspheric.

[0259] Table 15:

[0260] S1 S2 S6 S7 S8 S9 Conic Constant (K) -5.2323E+00 7.5180E+00 9.6125E-01 3.7067E-02 1.1513E-02 -1.1431E+00 Fourth Order Coefficient (A) 1.8694E-03 1.2969E-03 -6.9337E-05 1.0119E-02 -9.9568E-05 -1.6918E-02 Sixth Order Coefficient (B) -2.7190E-04 -5.5098E-04 1.2037E-03 2.3256E-03 2.6601E-04 8.6434E-03 Sixth Order Coefficient (C) 1.0785E-04 2.5101E-04 -1.4545E-03 -8.9162E-03 4.9126E-05 -1.2362E-04 Tenth Order Coefficient (D) -2.6169E-05 -6.8677E-05 6.6760E-04 7.7167E-03 -9.2659E-06 -1.5074E-03 Twelfth Order Coefficient (E) 3.9537E-06 1.1717E-05 -1.5868E-04 -3.8173E-03 0.0000E+00 7.5001E-04 Fourteenth Order Coefficient (F) -3.6929E-07 -1.2455E-06 1.1549E-05 1.1729E-03 0.0000E+00 -1.9586E-04 Sixteenth Order Coefficient (G) 2.0837E-08 8.0397E-08 2.6622E-06 -2.1972E-04 0.0000E+00 2.6167E-05 Eighteenth Order Coefficient (H) -6.5093E-10 -2.8846E-09 -6.0416E-07 2.2667E-05 0.0000E+00 0.0000E+00 Twentieth Order Coefficient (J) 8.6533E-12 4.4158E-11 3.2319E-08 -9.7724E-07 0.0000E+00 0.0000E+00 S10 S11 S12 S13 S14 S15 Conic Constant (K) 0.0000E+00 0.0000E+00 -9.8817E+00 -1.4173E+00 0.0000E+00 -4.5178E+00 Fourth Order Coefficient (A) -2.0658E-04 2.4119E-03 -6.0227E-03 1.5728E-03 -4.3905E-03 -1.2745E-02 Sixth Order Coefficient (B) 1.1035E-05 -1.7085E-04 1.0175E-03 -2.6494E-04 -1.0662E-03 4.7998E-04 Sixth Order Coefficient (C) -1.5792E-04 -1.2087E-04 1.3976E-03 -1.9772E-04 -3.4758E-04 2.1400E-04 Tenth Order Coefficient (D) -6.6055E-05 -8.3326E-05 -9.5454E-04 -1.2635E-04 3.1244E-04 5.6750E-05 Twelfth Order Coefficient (E) 0.0000E+00 0.0000E+00 1.1367E-04 1.2770E-05 -4.3263E-05 -1.7966E-05 Fourteenth Order Coefficient (F) 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 Sixteenth Order Coefficient (G) 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 Eighteenth Order Coefficient (H) 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 Twentieth Order Coefficient (J) 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0261] Figure 6 FIG. 6 is a configuration diagram illustrating an optical imaging system according to a sixth embodiment. The optical imaging system according to the sixth embodiment can be described with reference to FIG. 6. Figure 6

[0262] The optical imaging system according to the sixth embodiment can include a first lens group G1 and a second lens group G2. The optical imaging system can include a reflection member P disposed between the first lens group G1 and the second lens group G2.

[0263] The first lens group G1 can include a first lens 610, and the second lens group G2 can include, in order from the object side, a second lens 620, a third lens 630, a fourth lens 640, a fifth lens 650, and a sixth lens 660.

[0264] In addition, the optical imaging system can further include a filter 670 and an image sensor.

[0265] The optical imaging system according to the sixth embodiment can form a focal point on an imaging surface 680. The imaging surface 680 can refer to a surface on which the optical imaging system forms a focal point. As an example, the imaging surface 680 can refer to one surface of the image sensor on which light is received.

[0266] The reflection member P can be implemented as a prism, or can be disposed as a mirror.

[0267] The lens characteristics (radius of curvature, thickness of a lens or distance between lenses, refractive index, Abbe number, and focal length) of each lens are shown in Table 16.

[0268] Table 16:

[0269] Face No. Element Radius of Curvature Thickness or Distance Refractive Index Abbe Number Focal Length S1 First Lens 8.902 1.200 1.535 55.7 37 S2 15.366 1.800 S3 Prism Infinity 2.250 1.785 25.7 S4 Infinity 2.250 1.785 25.7 S5 Infinity 3.600 S6 Second Lens 3.850 1.141 1.535 55.7 6.592 S7 Aperture -39.546 0.377 S8 Third Lens -7.498 0.619 1.639 23.5 -4.270 S9 4.500 0.472 S10 Fourth Lens 5.182 0.500 1.544 56.0 127.89 S11 5.407 0.562 S12 Fifth Lens 10.709 0.955 1.661 20.4 4.784 S13 -4.396 0.350 S14 Sixth Lens -3.942 0.549 1.639 23.5 -6.820 S15 -39.699 4.838 S16 Filter Infinity 0.210 1.517 64.2 S17 Infinity 3.228 S18 Imaging Surface Infinity

[0270] Table 17:

[0271]

[0272]

[0273] ​Table 17 lists the effective radius of each of the first to sixth lenses 610 to 660 in the first axis (horizontal axis) direction and the effective radius in the second axis (vertical axis) direction. The first axis (horizontal axis) direction and the second axis (vertical axis) direction can refer to two directions perpendicular to the optical axis of each lens and perpendicular to each other.

[0274] The first lens 610 and the fourth lens 640 can have the same effective radius in the first axis (horizontal axis) direction and the same effective radius in the second axis (vertical axis) direction.

[0275] The object side surface and the image side surface of each of the second lens 620, the fifth lens 650, and the sixth lens 660 can have a larger effective radius in the first axis (horizontal axis) direction than in the second axis (vertical axis) direction.

[0276] The object side surface of the third lens 630 can have a larger effective radius in the first axis (horizontal axis) direction than in the second axis (vertical axis) direction. The image side surface of the third lens 630 can have the same effective radius in the first axis (horizontal axis) direction and the same effective radius in the second axis (vertical axis) direction.

[0277] In the sixth embodiment, the first lens group G1 can have a positive refractive power as a whole, and the second lens group G2 can have a positive refractive power as a whole.

[0278] The object side surface of the first lens 610 of the first lens group G1 can have a larger effective radius than the image side surface.

[0279] The first lens 610 can have a positive refractive power, the object side surface of the first lens 610 can be convex, and the image side surface of the first lens 610 can be concave.

[0280] The second lens 620 can have a positive refractive power, and the object side surface and the image side surface of the second lens 620 can be convex.

[0281] The third lens 630 can have a negative refractive power, and the object side surface and the image side surface of the third lens 630 can be concave.

[0282] The fourth lens 640 can have a positive refractive power, the object side surface of the fourth lens 640 can be convex, and the image side surface of the fourth lens 640 can be concave.

[0283] The fifth lens 650 can have a positive refractive power, and the object side surface and the image side surface of the fifth lens 650 can be convex.

[0284] The sixth lens 660 can have a negative refractive power, the object side surface of the sixth lens 660 can be concave, and the image side surface of the sixth lens 660 can be convex.

[0285] The aperture can be disposed between the second lens 620 and the third lens 630.

[0286] Each surface of the first lens 610 through the sixth lens 660 can have an aspheric coefficient as shown in Table 18. For example, the object side surface and the image side surface of each of the first lens 610 through the fifth lens 650 can be aspheric, the object side surface of the sixth lens 660 can be aspheric, and the image side surface of the sixth lens 660 can be spherical.

[0287] Table 18:

[0288]

[0289]

[0290] Figure 7 is a configuration diagram illustrating an optical imaging system according to a seventh embodiment. The optical imaging system according to the seventh embodiment can be described with reference to Figure 7 .

[0291] The optical imaging system according to the seventh embodiment can include a first lens group G1 and a second lens group G2. The optical imaging system can include a reflection member P disposed between the first lens group G1 and the second lens group G2.

[0292] The first lens group G1 can include a first lens 710, and the second lens group G2 can include, in order from the object side, a second lens 720, a third lens 730, a fourth lens 740, a fifth lens 750, and a sixth lens 760.

[0293] In addition, the optical imaging system can further include a filter 770 and an image sensor.

[0294] The optical imaging system according to the seventh embodiment can form a focal point on an imaging surface 780. The imaging surface 780 can refer to a surface on which the optical imaging system forms a focal point. As an example, the imaging surface 780 can refer to one surface of the image sensor on which light is received.

[0295] The reflection member P can be implemented as a prism, or can be disposed as a mirror.

[0296] The lens characteristics (radius of curvature, thickness of a lens or distance between lenses, refractive index, Abbe number, and focal length) of each lens are as shown in Table 19.

[0297] Table 19:

[0298]

[0299]

[0300] Table 20:

[0301]

[0302] Table 20 lists the effective radius in the first axis (horizontal axis) direction and the effective radius in the second axis (vertical axis) direction of each of the first to sixth lenses 710 to 760. The first axis (horizontal axis) direction and the second axis (vertical axis) direction can refer to two directions perpendicular to the optical axis of each lens and perpendicular to each other.

[0303] The first lens 710, the fourth lens 740, and the fifth lens 750 can have the same effective radius in the first axis (horizontal axis) direction and the same effective radius in the second axis (vertical axis) direction.

[0304] The effective radius of the object side surface and the image side surface of the second lens 720 in the first axis (horizontal axis) direction can be greater than the effective radius in the second axis (vertical axis) direction.

[0305] The effective radius of the object side surface of the third lens 730 in the first axis (horizontal axis) direction can be greater than the effective radius in the second axis (vertical axis) direction. The image side surface of the third lens 730 can have the same effective radius in the first axis (horizontal axis) direction and the same effective radius in the second axis (vertical axis) direction.

[0306] The object side surface of the sixth lens 760 can have the same effective radius in the first axis (horizontal axis) direction and the same effective radius in the second axis (vertical axis) direction. The effective radius of the image side surface of the sixth lens 760 in the first axis (horizontal axis) direction can be greater than the effective radius in the second axis (vertical axis) direction.

[0307] In the seventh embodiment, the first lens group G1 can have a positive refractive power as a whole, and the second lens group G2 can have a positive refractive power as a whole.

[0308] The effective radius of the object side surface of the first lens 710 of the first lens group G1 can be greater than the effective radius of the image side surface.

[0309] The first lens 710 can have a positive refractive power, the object side surface of the first lens 710 can be convex, and the image side surface of the first lens 710 can be concave.

[0310] The second lens 720 can have a positive refractive power, and the object side surface and the image side surface of the second lens 720 can be convex.

[0311] The third lens 730 can have a negative refractive power, and object and image sides of the third lens 730 can be concave.

[0312] The fourth lens 740 can have a negative refractive power, an object side of the fourth lens 740 can be convex, and an image side of the fourth lens 740 can be concave.

[0313] The fifth lens 750 can have a positive refractive power, an object side of the fifth lens 750 can be concave, and an image side of the fifth lens 750 can be convex.

[0314] The sixth lens 760 can have a negative refractive power, an object side of the sixth lens 760 can be concave, and an image side of the sixth lens 760 can be convex.

[0315] An aperture can be disposed between the second lens 720 and the third lens 730.

[0316] Each surface of the first lens 710 through the sixth lens 760 can have an aspheric coefficient as shown in Table 21. For example, the object and image sides of each of the first lens 710 through the fifth lens 750 can be aspheric, the object side of the sixth lens 760 can be aspheric, and the image side of the sixth lens 760 can be spherical.

[0317] Table 21:

[0318] S1 S2 S6 S7 S8 S9 Conic Constant (K) -4.4258E+00 6.3751E+00 8.0963E-01 3.7067E-02 7.4734E-01 0.0000E+00 Fourth Order Coefficient (A) 1.8951E-03 6.8235E-04 -2.6667E-03 4.7975E-03 -7.2631E-03 1.2738E-03 Sixth Order Coefficient (B) -1.5983E-04 -2.6444E-04 3.0205E-04 -3.1099E-03 6.5656E-03 1.3620E-03 Sixth Order Coefficient (C) 5.9614E-05 1.2376E-04 -1.1140E-03 1.1186E-04 -2.2791E-03 4.9594E-05 Tenth Order Coefficient (D) -1.3195E-05 -3.4020E-05 6.5315E-04 1.2029E-03 -8.1360E-05 4.0455E-05 Twelfth Order Coefficient (E) 1.9005E-06 5.9594E-06 -2.0569E-04 -7.8914E-04 3.9382E-04 0.0000E+00 Fourteenth Order Coefficient (F) -1.7471E-07 -6.6489E-07 3.1812E-05 2.4267E-04 -1.4427E-04 0.0000E+00 Sixteenth Order Coefficient (G) 1.0002E-08 4.6018E-08 -1.9307E-06 -4.0031E-05 1.7750E-05 0.0000E+00 Eighteenth Order Coefficient (H) -3.2437E-10 -1.8016E-09 0.0000E+00 3.4070E-06 0.0000E+00 0.0000E+00 Twentieth Order Coefficient (J) 4.5480E-12 3.0480E-11 0.0000E+00 -1.1883E-07 0.0000E+00 0.0000E+00 S10 S11 S12 S13 S14 Conic Constant (K) 0.0000E+00 1.5000E+01 4.2413E-01 0.0000E+00 0.0000E+00 Fourth Order Coefficient (A) 8.8470E-03 -6.0848E-03 -9.3808E-04 -2.6851E-03 -7.3909E-03 Sixth Order Coefficient (B) -6.4726E-04 4.3865E-04 7.7611E-04 -1.2268E-03 -1.4997E-03 Sixth Order Coefficient (C) 2.8455E-04 9.9524E-04 -2.9469E-04 -1.0564E-03 9.1314E-05 Tenth Order Coefficient (D) 1.8777E-04 -7.1909E-04 -1.9995E-04 2.6931E-04 0.0000E+00 Twelfth Order Coefficient (E) 0.0000E+00 1.4827E-04 6.9373E-05 -6.5931E-06 0.0000E+00 Fourteenth Order Coefficient (F) 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 Sixteenth Order Coefficient (G) 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 Eighteenth Order Coefficient (H) 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 Twentieth Order Coefficient (J) 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0319] Figure 8 FIG. 8 is a configuration diagram illustrating an optical imaging system according to an eighth embodiment. The optical imaging system according to the eighth embodiment can be described with reference to FIG. 8. Figure 8

[0320] The optical imaging system according to the eighth embodiment can include a first lens group G1 and a second lens group G2. The optical imaging system can include a reflection member P disposed between the first lens group G1 and the second lens group G2.

[0321] The first lens group G1 can include a first lens 810, and the second lens group G2 can include, in order from an object side, a second lens 820, a third lens 830, a fourth lens 840, a fifth lens 850, and a sixth lens 860.

[0322] In addition, the optical imaging system can further include a filter 870 and an image sensor.

[0323] ​The optical imaging system according to the eighth embodiment can form a focal point on an imaging surface 880. The imaging surface 880 can refer to a surface on which the optical imaging system forms a focal point. As an example, the imaging surface 880 can refer to one surface of an image sensor on which light is received.

[0324] The reflection member P can be implemented as a prism, or can be provided as a mirror.

[0325] The lens properties (radius of curvature, thickness of the lens or distance between the lenses, refractive index, Abbe number, and focal length) of each lens are as shown in Table 22.

[0326] Table 22:

[0327]

[0328] Table 23:

[0329]

[0330]

[0331] Table 23 lists the effective radius in the first axis (horizontal axis) direction and the effective radius in the second axis (vertical axis) direction of each of the first lens 810 to the sixth lens 860. The first axis (horizontal axis) direction and the second axis (vertical axis) direction can refer to two directions that are perpendicular to the optical axis of each lens and perpendicular to each other.

[0332] The first lens 810 and the fourth lens 840 can have the same effective radius in the first axis (horizontal axis) direction and the same effective radius in the second axis (vertical axis) direction.

[0333] The effective radius in the first axis (horizontal axis) direction of the object side surface and the image side surface of each of the second lens 820, the fifth lens 850, and the sixth lens 860 can be greater than the effective radius in the second axis (vertical axis) direction.

[0334] The effective radius in the first axis (horizontal axis) direction of the object side surface of the third lens 830 can be greater than the effective radius in the second axis (vertical axis) direction. The image side surface of the third lens 830 can have the same effective radius in the first axis (horizontal axis) direction and the same effective radius in the second axis (vertical axis) direction.

[0335] In the eighth embodiment, the first lens group G1 can have a positive refractive power as a whole, and the second lens group G2 can have a positive refractive power as a whole.

[0336] The effective radius of the object side surface of the first lens 810 of the first lens group G1 can be greater than the effective radius of the image side surface.

[0337] The first lens 810 can have a positive refractive power, the object side surface of the first lens 810 can be convex, and the image side surface of the first lens 810 can be concave.

[0338] The second lens 820 can have a positive refractive power, and the object side surface and the image side surface of the second lens 820 can be convex.

[0339] The third lens 830 can have a negative refractive power, and the object side surface and the image side surface of the third lens 830 can be concave.

[0340] The fourth lens 840 can have a positive refractive power, the object side surface of the fourth lens 840 can be convex, and the image side surface of the fourth lens 840 can be concave.

[0341] The fifth lens 850 can have a positive refractive power, and the object side surface and the image side surface of the fifth lens 850 can be convex.

[0342] The sixth lens 860 can have a negative refractive power, and the object side surface and the image side surface of the sixth lens 860 can be concave.

[0343] The aperture can be disposed between the second lens 820 and the third lens 830.

[0344] Each surface of the first lens 810 to the sixth lens 860 can have an aspheric coefficient as shown in Table 24. For example, the object side surface and the image side surface of each of the first lens 810 to the sixth lens 860 can be aspheric.

[0345] Table 24:

[0346]

[0347]

[0348] Table 25:

[0349] Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Embodiment 5 Embodiment 6 Embodiment 7 Embodiment 8 SAG11 1.01449 0.929942 0.929891 0.966599 1.01083 1.01446 0.989874 0.989919 SAG12 0.59263 0.55238 0.551089 0.590113 0.589051 0.59094 0.63984 0.572836 f 18.61 18.5822 18.5914 18.6095 18.6101 18.61 18.61 18.6104 fG1 38 37.985 37.988 37.5 37 37 42.851 37 fG2 27.1689 26.636 26.717 28.1399 30.4054 31.9427 28.5284 30.1433 CA_L11 6.960 6.960 6.960 6.960 7.500 7.500 7.100 7.500 CA_L21 3.650 3.650 3.650 3.650 3.650 3.650 3.650 3.650 DR 2.250 2.250 2.250 2.250 2.250 2.250 2.250 2.250 Lf 5.596 5.608 5.591 5.450 5.250 5.250 5.250 5.250 Lr 19.948 20.115 15.271 19.936 20.502 19.650 19.550 20.500 Fno 3.484 3.462 3.464 3.473 3.446 3.470 3.448 3.417

[0350] Table 26:

[0351]

[0352] According to the above-described embodiments, the optical imaging system can have a reduced size, and a high-resolution image can be obtained.

[0353] While particular examples have been shown and described, it will be apparent to those skilled in the art following the disclosure herein, that numerous changes can be made in the form and details of these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be considered merely illustrative, and not restrictive, in nature. Descriptions of features or aspects within each example are considered to apply to similar features or aspects within other examples. Suitable results can be obtained if the described techniques are performed in a different order, and / or if components within the described systems, architectures, devices, or circuits are combined in different manners, and / or replaced or supplemented by other components or equivalents thereof. Accordingly, the scope of the disclosure is not to be limited by the specific implementations illustrated and described, but only by the claims, and their equivalents, and all variations within the scope of the claims and their equivalents are to be construed as being included in the disclosure.

Claims

1. An optical imaging system, characterized in that: Comprising: A reflecting member having a reflecting surface for changing the path of light; A first lens group disposed on the front side of the reflecting member and including one or more lenses; And A second lens group disposed on the rear side of the reflecting member and including a plurality of lenses, wherein each of the first lens group and the second lens group has a positive refractive power, wherein the object surface of the frontmost lens disposed closest to the object side among the one or more lenses of the first lens group is convex, and satisfying 0.5 < fG1 / fG2 < 2.5, where fG1 is the focal length of the first lens group and fG2 is the focal length of the second lens group.

2. The optical imaging system according to claim 1, wherein: The reflecting member and the first lens group are configured to rotate about two axes perpendicular to each other.

3. The optical imaging system according to claim 2, wherein: One of the two axes is the optical axis of the first lens group or an axis parallel to the optical axis of the first lens group.

4. The optical imaging system according to claim 1, wherein the reflecting member includes an incident surface on which light is incident and an exit surface from which light exits, and the reflecting surface is disposed between the incident surface and the exit surface, and wherein the effective diameter of the object surface of the frontmost lens of the first lens group and the effective diameter of the image surface of the frontmost lens of the first lens group are greater than the minor axis length of the incident surface of the reflecting member.

5. The optical imaging system according to claim 1, wherein: Satisfying 0.4 < R1 / R 6. The optical imaging system according to claim 5, wherein: ​ 7. The optical imaging system according to claim 1, wherein: ​ 8. The optical imaging system according to claim 1, wherein: ​ 9. The optical imaging system according to claim 1, wherein: ​ ​ ​ ​ 11. The optical imaging system according to claim 1, wherein: Satisfy 0.5 [mm] < CA_L21 / Fno < 2 [mm], where CA_L21 is the effective diameter of the object side surface of the frontmost lens disposed closest to the reflection member among the plurality of lenses of the second lens group, and Fno is the F-number of the optical imaging system.

12. The optical imaging system according to claim 1, wherein the reflection member includes an incident surface where light is incident and an exit surface from which light exits, and the reflection surface is disposed between the incident surface and the exit surface, and where DP2 / fG2 < 0.4 is satisfied, where DP2 is the distance from the exit surface to the object side surface of the frontmost lens disposed closest to the reflection member among the plurality of lenses of the second lens group.

13. The optical imaging system according to claim 1, wherein: Satisfy 3 < fG1 / f2 < 11, where f2 is the focal length of the frontmost lens disposed closest to the reflection member among the plurality of lenses of the second lens group.

14. The optical imaging system according to claim 1, wherein: Satisfy -4 < f2 / f3 < 0, where f2 is the focal length of the frontmost lens disposed closest to the reflection member among the plurality of lenses of the second lens group, and f3 is the focal length of the lens disposed second closest to the reflection member among the plurality of lenses of the second lens group.

15. The optical imaging system according to claim 1, wherein the one or more lenses of the first lens group include a first lens, and where the plurality of lenses of the second lens group include a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens.

16. The optical imaging system according to claim 15, wherein the image side surface of the first lens is concave, where the second lens has a positive refractive power and the third lens has a negative refractive power, and where the focal length of the first lens is greater than the focal length of the second lens.

Images