Optical image capturing system

Abstract

The present disclosure provides an optical imaging system including: a plurality of lenses disposed along an optical axis; a first reflective member disposed at an object side of the plurality of lenses; and a plurality of reflective members disposed at the image side of the plurality of lenses. At least one of the plurality of lenses is a variable lens having a variable focal length, and each of the plurality of reflective members is configured to move as the focal length of the variable lens changes.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2021-0022588 filed on February 19, 2021, 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 following description relates to an optical imaging system. Background Art

[0004] Recently, camera modules have been adopted in portable electronic devices including smart phones.

[0005] Furthermore, in order to indirectly achieve an optical zoom effect, a method of installing a plurality of camera modules having different focal lengths in a portable electronic device has been proposed.

[0006] However, this method may require multiple camera modules with different focal lengths for an optical zoom effect, and the structure of the modules may be complicated. Summary of the invention

[0007] This Summary is provided to introduce some 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.

[0008] Various examples provide optical imaging systems that can achieve a zoom function by changing the focal length.

[0009] In one general aspect, an optical imaging system includes: a plurality of lenses arranged along an optical axis; a first reflective member arranged at an object side of the plurality of lenses; and a plurality of reflective members arranged at an image side of the plurality of lenses. At least one of the plurality of lenses is a variable lens having a variable focal length, and each of the plurality of reflective members is configured to move as the focal length of the variable lens changes.

[0010] The variable lens may be configured to have a first focal length or a second focal length as the focal length changes, the first focal length may be positive, and the second focal length may be negative.

[0011] The variable lens may include a liquid lens and a plane lens attached to an image-side surface of the liquid lens.

[0012] The radius of curvature of the object-side surface of the liquid lens may be variable, and the thickness of the liquid lens on the optical axis may be variable.

[0013] The variable lens can be configured to have a first focal length or a second focal length as the focal length changes. The first focal length can be positive, and the second focal length can be negative. When the variable lens has the first focal length, the radius of curvature of the object-side surface of the liquid lens can be positive. When the variable lens has the second focal length, the radius of curvature of the object-side surface of the liquid lens can be negative, and when the variable lens has the second focal length, the thickness of the liquid lens on the optical axis can be less than the thickness when the variable lens has the first focal length.

[0014] The plurality of lenses can include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially arranged from the object side, and the variable lens can be the second lens or the sixth lens.

[0015] The variable lens can be the second lens. The first lens can have a positive refractive power, the second lens can have a positive refractive power or a negative refractive power, the third lens can have a negative refractive power, the fourth lens can have a positive refractive power, the fifth lens can have a negative refractive power, and the sixth lens can have a positive refractive power.

[0016] The variable lens can be the sixth lens. The first lens can have a positive refractive power, the second lens can have a negative refractive power, the third lens can have a positive refractive power, the fourth lens can have a negative refractive power, the fifth lens can have a positive refractive power, and the sixth lens can have a positive refractive power or a negative refractive power.

[0017] The plurality of reflecting members can include a second reflecting member and a third reflecting member. The second reflecting member can include a reflecting surface configured to reflect light in a direction perpendicular to the optical axis of the plurality of lenses, and the third reflecting member can include a reflecting surface configured to reflect the light reflected by the second reflecting member in a direction parallel to the optical axis of the plurality of lenses.

[0018] The second reflecting member and the third reflecting member can be configured to move together.

[0019] The optical imaging system can satisfy 10 < fv_1 / D6R_1, where fv_1 is the first focal length of the variable lens, and D6R_1 is the distance on the optical axis from the last lens among the plurality of lenses to the reflecting member closest to the last lens among the plurality of reflecting members when the variable lens has the first focal length.

[0020] The optical imaging system can satisfy -15 < fv_2 / D6R_2 < -3, where fv_2 is the second focal length of the variable lens, and D6R_2 is the distance on the optical axis from the last lens among the plurality of lenses to the reflecting member closest to the last lens among the plurality of reflecting members when the variable lens has the second focal length.

[0021] The optical imaging system can satisfy -7 < (fv_1 × D6R_2) / (fv_2 × D6R_1) < -1, where fv_1 is the first focal length of the variable lens, fv_2 is the second focal length of the variable lens, D6R_1 is the distance on the optical axis from the last lens among the plurality of lenses to the reflection member closest to the last lens among the plurality of reflection members when the variable lens has the first focal length, and D6R_2 is the distance on the optical axis from the last lens to the reflection member closest to the last lens when the variable lens has the second focal length.

[0022] The optical imaging system can satisfy -3 < fv_2 / fv_1 < 0, where fv_1 is the first focal length of the variable lens, fv_2 is the second focal length of the variable lens, the first focal length is positive, and the second focal length is negative.

[0023] The optical imaging system can satisfy 3 < D6R_2 / D6R_1 < 6, where D6R_1 is the distance on the optical axis from the last lens among the plurality of lenses to the reflection member closest to the last lens among the plurality of reflection members when the variable lens has the first focal length, and D6R_2 is the distance on the optical axis from the last lens to the reflection member closest to the last lens when the variable lens has the second focal length, and where the first focal length is positive and the second focal length is negative.

[0024] The optical imaging system can satisfy 0 < L1 / TTL1 < 1, where L1 is the linear distance in a direction parallel to the optical axis from the object-side surface of the foremost lens among the plurality of lenses to the imaging surface when the variable lens has the first focal length, and TTL1 is the distance on the optical axis from the object-side surface of the foremost lens to the imaging surface when the variable lens has the first focal length.

[0025] The optical imaging system can satisfy 0 < L2 / TTL2 < 1, where L2 is the linear distance in a direction parallel to the optical axis from the object-side surface of the foremost lens among the plurality of lenses to the imaging surface when the variable lens has the second focal length, and TTL2 is the distance on the optical axis from the object-side surface of the foremost lens to the imaging surface when the variable lens has the second focal length.

[0026] The optical imaging system can satisfy 1 < (L1 × TTL2) / (L2 × TTL1) < 3, where L1 is the linear distance in a direction parallel to the optical axis from the object-side surface of the foremost lens among the plurality of lenses to the imaging surface when the variable lens has the first focal length, L2 is the linear distance in a direction parallel to the optical axis from the object-side surface of the foremost lens to the imaging surface when the variable lens has the second focal length, TTL1 is the distance on the optical axis from the object-side surface of the foremost lens to the imaging surface when the variable lens has the first focal length, and TTL2 is the distance on the optical axis from the object-side surface of the foremost lens to the imaging surface when the variable lens has the second focal length.

[0027] Other features and aspects will be apparent from the following detailed description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a diagram illustrating a first example in which a first lens group and a second lens group are disposed at a first position in an optical imaging system.

[0029] Figure 2 Yes means Figure 1 Graphs of the aberration characteristics of the optical imaging system shown in .

[0030] Figure 3 is a diagram illustrating a first example in which the first lens group and the second lens group are disposed at a second position in the optical imaging system.

[0031] Figure 4 Yes means Figure 3 Graphs of the aberration characteristics of the optical imaging system shown in .

[0032] Figure 5 is a diagram illustrating a second example in which a first lens group and a second lens group are disposed at a first position in an optical imaging system.

[0033] Figure 6 Yes means Figure 5 Graphs of the aberration characteristics of the optical imaging system shown in .

[0034] Figure 7 is a diagram showing a second example in which the first lens group and the second lens group are arranged at a second position in the optical imaging system.

[0035] Figure 8 Yes means Figure 7 Graphs of the aberration characteristics of the optical imaging system shown in .

[0036] Fig. 9 is a diagram illustrating a third example in which a first lens group and a second lens group are disposed at a first position in an optical imaging system.

[0037] Fig.10 Yes means Fig. 9 Graphs of the aberration characteristics of the optical imaging system shown in .

[0038] Fig.11 is a diagram showing a third example in which the first lens group and the second lens group are arranged at a second position in the optical imaging system.

[0039] Fig.12 Yes means Fig.11Graphs of the aberration characteristics of the optical imaging system shown in .

[0040] Fig.13 is a diagram illustrating a fourth example in which a first lens group and a second lens group are disposed at a first position in an optical imaging system.

[0041] Fig.14 Yes means Fig.13 Graphs of the aberration characteristics of the optical imaging system shown in .

[0042] Fig.15 is a diagram illustrating a fourth example in which the first lens group and the second lens group are disposed at a second position in the optical imaging system.

[0043] Fig.16 Yes means Fig.15 Graphs of the aberration characteristics of the optical imaging system shown in .

[0044] Fig.17 is a diagram illustrating a fifth example in which a first lens group and a second lens group are disposed at a first position in an optical imaging system.

[0045] Fig.18 Yes means Fig.17 Graphs of the aberration characteristics of the optical imaging system shown in .

[0046] Fig.19 is a diagram illustrating a fifth example in which the first lens group and the second lens group are disposed at a second position in the optical imaging system.

[0047] Fig. 20 Yes means Fig.19 Graphs of the aberration characteristics of the optical imaging system shown in .

[0048] Fig.21 is a modified example of a plurality of reflecting members according to the example.

[0049] Like reference numerals refer to like elements throughout the drawings and detailed description. DETAILED DESCRIPTION

[0050] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices and / or systems described herein. However, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent to those of ordinary skill in the art. As will be apparent to those of ordinary skill in the art, the order of operations described herein is merely an example and is not limited to the order set forth herein, but may be changed, except for operations that must occur in a certain order. In addition, for increased clarity and brevity, descriptions of functions and structures that are known to those of ordinary skill in the art may be omitted.

[0051] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the embodiments described herein have been provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those of ordinary skill in the art.

[0052] In this document, it will be noted that the use of the term "may" with respect to an embodiment or example, for example with respect to what an embodiment or example may include or implement, means that there is at least one embodiment or example that includes or implements such feature, while all embodiments and examples are not limited thereto.

[0053] Throughout the specification, when an element such as a layer, a region or a substrate is described as being “on”, “connected to” or “coupled to” another element, it may be directly “on”, “connected to” or “coupled to” the other element, or one or more other elements may be present between them. Conversely, when an element is described as being “directly on”, “directly connected to” or “directly coupled to” another element, there are no other elements present between them.

[0054] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more.

[0055] Although terms such as "first", "second" and "third" may be used herein to describe various members, components, regions, layers or parts, these members, components, regions, layers or parts are not limited by these terms. Specifically, these terms are only used to distinguish one member, component, region, layer or part from another member, component, region, layer or part. Therefore, without departing from the teachings of the examples described herein, the first member, first component, first region, first layer or first part mentioned in the examples may also be referred to as the second member, second component, second region, second layer or second part.

[0056] For ease of description, spatially relative terms such as "above", "upper", "below" and "lower" may be used herein to describe the relationship of one element to another element as shown in the figure. In addition to the orientation depicted in the figure, such spatially relative terms are intended to also include different orientations of the device in use or operation. For example, if the device in the figure is turned over, the element described as being "above" or "upper" relative to another element will then be "below" or "lower" relative to the other element. Therefore, the term "above" includes both the orientation above and below, depending on the spatial orientation of the device. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein will be interpreted accordingly.

[0057] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. The articles "a", "an" and "the" are intended to include plural forms as well, unless the context clearly indicates otherwise. The terms "include", "comprise" and "have" specify the presence of stated features, numbers, operations, components, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, numbers, operations, components, elements and / or combinations thereof.

[0058] Due to manufacturing techniques and / or tolerances, the shapes shown in the drawings may vary. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0059] As will be apparent after obtaining an understanding of the disclosure of the present application, the features of the examples described herein can be combined in various ways. In addition, although the examples described herein have multiple configurations, as will be apparent after obtaining an understanding of the disclosure of the present application, other configurations are also possible.

[0060] The drawings may not be drawn to scale, and the relative sizes, proportions, and depictions of elements in the drawings may be exaggerated for clarity, illustration, and convenience.

[0061] In the drawings showing lenses, the thickness, size, and shape of the lenses are exaggerated to show examples, and the spherical or non-spherical shapes of the lenses shown in the drawings are examples, and the shapes are not limited thereto.

[0062] Various examples of optical imaging systems may be installed on a portable electronic device. For example, the optical imaging system may be a component of a camera module installed in a portable electronic device. The portable electronic device may be implemented as a portable electronic device such as a mobile communication terminal, a smart phone, or a tablet PC.

[0063] The optical imaging system may include a plurality of lenses, and the plurality of lenses may be spaced apart from each other by a predetermined distance.

[0064] As an example, the optical imaging system may include at least six lenses. However, the number of lenses is not limited thereto, and the number of lenses may be less than or greater than six.

[0065] The first lens (or frontmost lens) may refer to a lens closest to the object side (or first reflecting member) along the optical axis, and the last lens (or last lens) refers to a lens closest to the imaging surface (or second reflecting member) along the optical axis.

[0066] In addition, in each lens, the first surface may refer to a surface adjacent to the object side (or object side surface), and the second surface may refer to a surface adjacent to the image side (or image side surface). In addition, in an exemplary embodiment, the radius of curvature, thickness, distance, and focal length of the lens may be expressed in mm, and the unit of the field of view (FOV) may be in degrees.

[0067] The imaging surface may refer to a virtual surface on which a focus is formed by an optical imaging system. Alternatively, the imaging surface may refer to a surface of an image sensor through which light is received.

[0068] The optical imaging system may include at least six lenses.

[0069] For example, the optical imaging system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side (or the first reflective member).

[0070] If necessary, the optical imaging system may include seven or more lenses.In addition, the optical imaging system may further include an image sensor for converting an incident image of the object into an electrical signal.

[0071] The optical imaging system may further include a plurality of reflective members having a reflective surface that can change the optical path. For example, each of the plurality of reflective members may be a reflective mirror or a prism.

[0072] One of the plurality of reflective members may be disposed at the front side of the plurality of lenses. For example, the first reflective member may be disposed at the front side of the first lens (disposed to be closer to the object side than the first lens). Other reflective members may be disposed at the rear side of the plurality of lenses. As an example, another reflective member may be disposed between the sixth lens and the image sensor (or imaging surface) along the optical axis.

[0073] By arranging a plurality of reflection members between a plurality of lenses and an image sensor to reflect the light path multiple times, a long light path can be formed in a relatively narrow space.

[0074] Therefore, the optical imaging system can have a reduced size and a long focal length.

[0075] In addition, the optical imaging system may further include an infrared cut filter (hereinafter, referred to as a filter) for blocking infrared rays. The filter may be disposed between a reflective member disposed most adjacent to the image sensor among the plurality of reflective members and the image sensor.

[0076] In an exemplary embodiment, all lenses included in the optical imaging system may be formed of a plastic material.

[0077] One of the plurality of lenses may be configured as a lens whose focal length changes (hereinafter, referred to as a “variable lens”). The variable lens may include a liquid lens and a flat lens attached to the liquid lens.

[0078] The lenses other than the variable lens may have an aspherical surface. For example, each of the lenses other than the variable lens may have at least one aspherical surface.

[0079] The aspherical surface of the lens can be expressed by Equation 1.

[0080] [Equation 1]

[0081]

[0082] In Equation 1, c is the curvature of the lens (the inverse of the radius of curvature), K is the cone constant, and Y is the distance from any point on the aspherical surface of the lens to the optical axis. In addition, constants A to E refer to aspherical coefficients. Z represents the distance from any point on the aspherical surface of the lens to the vertex of the aspherical surface (SAG).

[0083] The optical imaging system may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side toward the image side. The second lens or the sixth lens may be a variable lens.

[0084] For example, when the focal length is changed, the second lens or the sixth lens may have positive or negative refractive power.

[0085] In an optical imaging system, since the focal length of one of the plurality of lenses can be changed, the focal length of the optical imaging system can also be changed.

[0086] Therefore, even when the lens is not directly moved, the focal length of the optical imaging system can be changed, so that a zoom effect can be easily achieved.

[0087] When the focal length is changed by directly moving the lens, it may be necessary to ensure the moving distance of the lens, and thus, the overall length of the optical imaging system may be increased. However, the optical imaging system in the exemplary embodiment may achieve a zoom effect and may have a reduced size.

[0088] Variable lenses can include liquid lenses and flat lenses.

[0089] In a liquid lens, the radius of curvature and thickness of the object side surface can be changed. Therefore, the focal length of the liquid lens can be changed. The thickness can refer to the thickness on the optical axis.

[0090] When the variable lens has positive refractive power, the radius of curvature of the object-side surface of the liquid lens may be positive. When the variable lens has negative refractive power, the radius of curvature of the object-side surface of the liquid lens may be negative.

[0091] When the variable lens has negative refractive power, the thickness of the liquid lens on the optical axis may be smaller than when the variable lens has positive refractive power.

[0092] The plane lens may be coupled to the image side surface of the liquid lens to support the liquid lens. For example, the liquid lens and the plane lens may be combined with each other. In the plane lens, both the object side surface and the image side surface may be planar.

[0093] A plurality of reflective members may be disposed between the plurality of lenses and the image sensor. For example, a plurality of reflective members may be disposed between the last lens among the plurality of lenses and the image sensor. The optical axis may be folded by the plurality of reflective members disposed between the last lens and the image sensor.

[0094] The plurality of reflective members disposed between the final lens and the image sensor can be moved. Therefore, the distance on the optical axis between the final lens and the image sensor can be changed, so that even when the focal length of the optical imaging system changes, a focus can be easily formed on the image sensor (or imaging surface).

[0095] Therefore, the optical imaging system can have an optical zoom function and a focus adjustment function.

[0096] The optical imaging system may have the characteristics of a telephoto lens having a relatively narrow field of view and a long focal length.

[0097] The optical imaging system may satisfy at least one of the following conditional equations:

[0098] [Conditional equation 1] 10 <fv_1 / D6R_1

[0099] [Conditional equation 2]-15 <fv_2 / D6R_2<-3

[0100] [Conditional equation 3] -7<(fv_1×D6R_2) / (fv_2×D6R_1)<-1

[0101] [Conditional equation 4]-3 <fv_2 / fv_1<0

[0102] [Conditional equation 5]3 <D6R_2 / D6R_1<6

[0103] [Conditional equation 6] 0 <L1 / TTL1<1

[0104] [Conditional equation 7] 0 <L2 / TTL2<1

[0105] [Conditional equation 8] 1<(L1×TTL2) / (L2×TTL1)<3

[0106] In the conditional equation, fv_1 is a first focal length of the variable lens, and fv_2 is a second focal length of the variable lens.

[0107] The focal length of the variable lens can be changed. Therefore, the focal length of the optical imaging system can also be changed. For example, when the variable lens has a first focal length, the optical imaging system can have the first focal length, and when the variable lens has a second focal length, the optical imaging system can have the second focal length.

[0108] The first focal length of the variable lens may be positive and the second focal length may be negative.

[0109] The second focal length of the optical imaging system may be greater than the first focal length.

[0110] D6R_1 is the distance from the last lens to the second reflecting member on the optical axis when the optical imaging system has a first focal length (or the variable lens has a first focal length).

[0111] D6R_2 is the distance on the optical axis from the last lens to the second reflecting member when the optical imaging system has a second focal length (or when the variable lens has a second focal length).

[0112] When the optical imaging system may include six lenses, the last lens may be the sixth lens.

[0113] L1 is a linear distance from the object-side surface of the first lens to the imaging surface in a direction parallel to the optical axis when the optical imaging system has a first focal length (or when the variable lens has a first focal length).

[0114] L2 is a linear distance from the object-side surface of the first lens to the imaging surface in a direction parallel to the optical axis when the optical imaging system has a second focal length (or when the variable lens has a second focal length). L1 and L2 may be the same.

[0115] TTL1 is the distance from the object side surface of the first lens to the imaging surface on the optical axis when the optical imaging system has a first focal length (or the variable lens has a first focal length), such as Figure 1As shown, TTL1=a+b+c, wherein a is the distance from the object-side surface of the first lens to the second reflecting component R2 on the optical axis when the optical imaging system has a first focal length, b is the distance from the second reflecting component R2 to the third reflecting component R3 on the optical axis when the optical imaging system has the first focal length, and c is the distance from the third reflecting component R3 to the imaging surface on the optical axis when the optical imaging system has the first focal length.

[0116] TTL2 is the distance from the object side surface of the first lens to the imaging surface on the optical axis when the optical imaging system has a second focal length (or the variable lens has a second focal length), such as Figure 3 As shown, TTL2 = a'+b'+c', where a' is the distance on the optical axis from the object-side surface of the first lens to the second reflecting component R2 when the optical imaging system has a second focal length, b' is the distance on the optical axis from the second reflecting component R2 to the third reflecting component R3 when the optical imaging system has a second focal length, and c' is the distance on the optical axis from the third reflecting component R3 to the imaging surface when the optical imaging system has a second focal length. Figures 1 to 4 A first example of an optical imaging system is described.

[0117] Figure 1 is a diagram showing a state in which the optical imaging system has a first focal length, and Figure 3 is a diagram showing a state in which the optical imaging system has a second focal length.

[0118] The optical imaging system in the first example may include a first lens 110 , a second lens 120 , a third lens 130 , a fourth lens 140 , a fifth lens 150 , and a sixth lens 160 .

[0119] The optical imaging system may form a focus on the imaging surface 180 .

[0120] In addition, the optical imaging system may further include an optical filter 170 and an image sensor IS. In addition, a stop may be disposed between the third lens 130 and the fourth lens 140 .

[0121] In addition, the optical imaging system may further include a first reflective member R1 disposed at the front side (object side) of the first lens 110 and having a reflective surface for changing the optical path. The first reflective member R1 may be implemented by a prism or may be provided as a reflective mirror.

[0122] exist Figure 1 and Figure 3 In FIG. 5 , the prism, ie, the first reflective member R1 , may have a flat plate shape, but an actual prism may have a triangular columnar shape.

[0123] Light incident to the first reflective member R1 may be reflected by the first reflective member R1 and may pass through the first to sixth lenses 110 to 160. For example, light incident to the first reflective member R1 along the first optical axis may be reflected toward a second optical axis perpendicular to the first optical axis.

[0124] In addition, the optical imaging system may further include a second reflective member R2 and a third reflective member R3, which are disposed at the rear side (image side) of the sixth lens 160 and each have a reflective surface for changing the optical path. The second reflective member R2 and the third reflective member R3 may be disposed between the sixth lens 160 and the image sensor IS.

[0125] In the first example, the second reflective member R2 and the third reflective member R3 may be implemented as reflective mirrors, or may be configured as prisms. Fig.21 As shown in FIG. 4 , the second reflective member R2 and the third reflective member R3 may be provided in the form of a single prism R2 ′ having two reflective surfaces.

[0126] The light passing through the first to sixth lenses 110 to 160 may be reflected by the second reflective member R2. For example, the light passing through the first to sixth lenses 110 to 160 may be reflected by the second reflective member R2 toward a third optical axis perpendicular to the second optical axis. The second reflective member R2 may have a reflective surface for reflecting the light to the third optical axis perpendicular to the second optical axis.

[0127] The light reflected by the second reflection member R2 may be reflected again by the third reflection member R3. For example, the light reflected by the second reflection member R2 toward the third optical axis may be reflected by the third reflection member R3 toward a fourth optical axis perpendicular to the third optical axis and may be received in the image sensor IS. The third reflection member R3 may have a reflection surface for reflecting light to the fourth optical axis perpendicular to the third optical axis.

[0128] The second optical axis and the fourth optical axis may be parallel to each other.

[0129] The filter 170 may be disposed between the third reflective member R3 and the image sensor IS.

[0130] At least one of the first to sixth lenses 110 to 160 may be a variable lens having a variable focal length. For example, the second lens 120 may be a variable lens. The second lens 120 may include a liquid lens 121 and a plane lens 123 attached to the image side surface of the liquid lens 121.

[0131] The curvature radius and thickness of the object-side surface of the liquid lens 121 may be changed. Therefore, the focal length of the liquid lens 121 may be changed. The thickness may refer to the thickness on the optical axis.

[0132] When the focal length of the second lens 120 changes, the focal length of the optical imaging system may also change.

[0133] Even when the first to sixth lenses 110 to 160 do not move, the focal length of the optical imaging system can be changed by changing the focal length of the second lens 120, so that a zoom effect can be easily achieved.

[0134] Since the focal length of the optical imaging system changes, the second reflective member R2 and the third reflective member R3 may move to form a focus on the imaging surface 180. For example, when the second reflective member R2 and the third reflective member R3 move, the distance between the sixth lens 160 and the second reflective member R2 may change, and the distance between the third reflective member R3 and the image sensor IS (or the imaging surface 180) may also change.

[0135] Here, "distance" may refer to the distance on the optical axis between two members.

[0136] The second reflective member R2 and the third reflective member R3 may move together. Therefore, the distance on the optical axis between the second reflective member R2 and the third reflective member R3 may not change.

[0137] The length of the optical path may be changed by movement of the second and third reflective members R2 and R3.

[0138] The first reflecting member R1 and the first to sixth lenses 110 to 160 may be fixed members whose positions may be fixed, and the second and third reflecting members R2 and R3 may be movable members whose positions may be changed.

[0139] The characteristics of each lens (radius of curvature, thickness of the lens or distance between lenses, refractive index, and Abbe number) can be listed in Table 1.

[0140] In Table 1, the refractive indices of the second and third reflective members R2 and R3 may be represented by negative numbers, which may mean that the second and third reflective members R2 and R3 may have reflective surfaces for reflecting light.

[0141] [Table 1]

[0142]

[0143]

[0144] [Table 2]

[0145] At the first focal length At the second focal length r3 10.8963 -22.0525 D12 0.7278 1.1606 T2 2.2907 1.8578 D6R 3 17.0064 DR3F 5.0347 19.0410

[0146] r3 is the radius of curvature of the object-side surface of the second lens 120, D12 is the distance on the optical axis from the image-side surface of the first lens 110 to the object-side surface of the second lens 120, T2 is the thickness of the liquid lens 121 in the second lens 120 on the optical axis, D6R is the distance on the optical axis from the image-side surface of the sixth lens 160 to the second reflective member R2, and DR3F is the distance on the optical axis between the third reflective member R3 and the filter 170.

[0147] [Table 3]

[0148] At the first focal length At the second focal length f 16.2019 31.7632 f1 129.4498 129.4498 f2 36.5646 -74.0016 f3 -7.9005 -7.9005 f4 12.0602 12.0602 f5 -12.1492 -12.1492 f6 7.5529 7.5529

[0149] f is the focal length of the optical imaging system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.

[0150] In a first example, the first lens 110 may have positive refractive power, a first surface of the first lens 110 may be a concave surface, and a second surface of the first lens 110 may be a convex surface.

[0151] The second lens 120 may be a variable lens whose focal length may be changed. For example, the second lens 120 may have a first focal length and a second focal length. The second lens 120 may include a liquid lens 121 and a plane lens 123 attached to the image side surface of the liquid lens 121.

[0152] When the second lens 120 has the first focal length, the second lens 120 may have positive refractive power. In addition, the first surface of the second lens 120 (e.g., the object-side surface of the liquid lens 121) may have a convex surface, and the second surface of the second lens 120 (e.g., the image-side surface of the plane lens 123) may be a plane.

[0153] When the second lens 120 has the second focal length, the second lens 120 may have negative refractive power. In addition, the first surface of the second lens 120 may be a concave surface, and the second surface of the second lens 120 may be a flat surface.

[0154] The third lens 130 may have negative refractive power, and the first and second surfaces of the third lens 130 may be concave surfaces.

[0155] The fourth lens 140 may have positive refractive power, a first surface of the fourth lens 140 may be a concave surface, and a second surface of the fourth lens 140 may be a convex surface.

[0156] The fifth lens 150 may have negative refractive power, a first surface of the fifth lens 150 may be a convex surface, and a second surface of the fifth lens 150 may be a concave surface.

[0157] The sixth lens 160 may have positive refractive power, and the first and second surfaces of the sixth lens 160 may be convex surfaces.

[0158] Each surface of the first lens 110 and the third to sixth lenses 130 to 160 may have an aspherical coefficient as shown in Table 4. For example, the object-side surface and the image-side surface of the first lens 110 and the third to sixth lenses 130 to 160 may be aspherical surfaces.

[0159] [Table 4]

[0160]

[0161]

[0162] Furthermore, the optical imaging system configured as described above may have Figures 2 to 4 Aberration characteristics shown in .

[0163] Will refer to Figures 5 to 8 A second example of an optical imaging system is described.

[0164] Figure 5 is a diagram showing a state in which the optical imaging system has a first focal length, and Figure 7 is a diagram showing a state in which the optical imaging system has a second focal length.

[0165] The optical imaging system in the second example may include a first lens 210 , a second lens 220 , a third lens 230 , a fourth lens 240 , a fifth lens 250 , and a sixth lens 260 .

[0166] The optical imaging system may form a focus on the imaging surface 280 .

[0167] In addition, the optical imaging system may further include an optical filter 270 and an image sensor IS. In addition, a stop may be disposed between the third lens 230 and the fourth lens 240 .

[0168] In addition, the optical imaging system may further include a first reflective member R1 disposed at the front side of the first lens 210 and having a reflective surface for changing the optical path. The first reflective member R1 may be implemented by a prism or may be provided as a reflective mirror.

[0169] exist Figure 5 and Figure 7 In FIG. 5 , the prism, ie, the first reflective member R1 , may have a flat plate shape, but an actual prism may have a triangular columnar shape.

[0170] Light incident to the first reflective member R1 may be reflected by the first reflective member R1 and may pass through the first to sixth lenses 210 to 260. For example, light incident to the first reflective member R1 along the first optical axis may be reflected toward a second optical axis perpendicular to the first optical axis.

[0171] In addition, the optical imaging system may further include a second reflective member R2 and a third reflective member R3 disposed at the rear side of the sixth lens 260 and each having a reflective surface for changing the optical path. The second reflective member R2 and the third reflective member R3 may be disposed between the sixth lens 260 and the image sensor IS.

[0172] The second reflective member R2 and the third reflective member R3 may be implemented as reflectors, or may be configured as prisms. Fig.21 As shown in FIG. 4 , the second reflective member R2 and the third reflective member R3 may be provided in the form of a single prism R2 ′ having two reflective surfaces.

[0173] The light passing through the first to sixth lenses 210 to 260 may be reflected by the second reflective member R2. For example, the light passing through the first to sixth lenses 210 to 260 may be reflected by the second reflective member R2 toward a third optical axis perpendicular to the second optical axis. The second reflective member R2 may have a reflective surface for reflecting the light to the third optical axis perpendicular to the second optical axis.

[0174] The light reflected by the second reflection member R2 may be reflected again by the third reflection member R3. For example, the light reflected by the second reflection member R2 toward the third optical axis may be reflected by the third reflection member R3 toward a fourth optical axis perpendicular to the third optical axis and may be received in the image sensor IS. The third reflection member R3 may have a reflection surface for reflecting light to the fourth optical axis perpendicular to the third optical axis.

[0175] The second optical axis and the fourth optical axis may be parallel to each other.

[0176] The filter 270 may be disposed between the third reflective member R3 and the image sensor IS.

[0177] At least one of the first to sixth lenses 210 to 260 may be a variable lens having a variable focal length. For example, the second lens 220 may be a variable lens. The second lens 220 may include a liquid lens 221 and a plane lens 223 attached to the image side surface of the liquid lens 221.

[0178] The curvature radius and thickness of the object-side surface of the liquid lens 221 may be changed. Therefore, the focal length of the liquid lens 221 may be changed. The thickness may refer to the thickness on the optical axis.

[0179] When the focal length of the second lens 220 changes, the focal length of the optical imaging system may also change.

[0180] Even when the first to sixth lenses 210 to 260 do not move, the focal length of the optical imaging system can be changed by changing the focal length of the second lens 220, so that a zoom effect can be easily achieved.

[0181] Since the focal length of the optical imaging system changes, the second reflective member R2 and the third reflective member R3 may move to form a focus on the imaging surface 280. For example, when the second reflective member R2 and the third reflective member R3 move, the distance between the sixth lens 260 and the second reflective member R2 may change, and the distance between the third reflective member R3 and the image sensor IS (or the imaging surface 280) may also change.

[0182] Here, "distance" may refer to the distance on the optical axis between two members.

[0183] The second reflective member R2 and the third reflective member R3 may move together. Therefore, the distance on the optical axis between the second reflective member R2 and the third reflective member R3 may not change.

[0184] The length of the optical path may be changed by movement of the second and third reflective members R2 and R3.

[0185] The first reflecting member R1 and the first to sixth lenses 210 to 260 may be fixed members whose positions may be fixed, and the second and third reflecting members R2 and R3 may be movable members whose positions may be changed.

[0186] The characteristics of each lens (radius of curvature, thickness of the lens or distance between lenses, refractive index, and Abbe number) can be listed in Table 5.

[0187] In Table 5, the refractive indices of the second and third reflective members R2 and R3 may be represented by negative numbers, which may mean that the second and third reflective members R2 and R3 may have reflective surfaces for reflecting light.

[0188] [Table 5]

[0189]

[0190] [Table 6]

[0191]

[0192]

[0193] The definitions of r3, D12, T2, D6R, and DR3F may be the same as in the first example.

[0194] [Table 7]

[0195] At the first focal length At the second focal length f 16.58 28.55 f1 250 250 f2 47.6 -54.5168 f3 -7.42 -7.42 f4 9 9 f5 -12.651 -12.651 f6 8.4 8.4

[0196] The definitions of f, f1, f2, f3, f4, f5, and f6 may be the same as those of the first example.

[0197] In a second example, the first lens 210 may have positive refractive power, a first surface of the first lens 210 may be a concave surface, and a second surface of the first lens 210 may be a convex surface.

[0198] The second lens 220 may be a variable lens whose focal length may be changed. For example, the second lens 220 may have a first focal length and a second focal length. The second lens 220 may include a liquid lens 221 and a plane lens 223 attached to the image side surface of the liquid lens 221.

[0199] When the second lens 220 has the first focal length, the second lens 220 may have positive refractive power. In addition, the first surface of the second lens 220 (e.g., the object-side surface of the liquid lens 221) may be a convex surface, and the second surface of the second lens 220 (e.g., the image-side surface of the plane lens 223) may be a plane.

[0200] When the second lens 220 has the second focal length, the second lens 220 may have negative refractive power. In addition, the first surface of the second lens 220 may be a concave surface, and the second surface of the second lens 220 may be a flat surface.

[0201] The third lens 230 may have negative refractive power, and the first and second surfaces of the third lens 230 may be concave surfaces.

[0202] The fourth lens 240 may have positive refractive power, a first surface of the fourth lens 240 may be a concave surface, and a second surface of the fourth lens 240 may be a convex surface.

[0203] The fifth lens 250 may have negative refractive power, a first surface of the fifth lens 250 may be a convex surface, and a second surface of the fifth lens 250 may be a concave surface.

[0204] The sixth lens 260 may have positive refractive power, and the first and second surfaces of the sixth lens 260 may be convex surfaces.

[0205] Each surface of the first lens 210 and the third to sixth lenses 230 to 260 may have an aspherical coefficient as shown in Table 8. For example, the object-side surface and the image-side surface of the first lens 210 and the third to sixth lenses 230 to 260 may be aspherical surfaces.

[0206] [Table 8]

[0207] Cone constant The fourth coefficient The sixth coefficient The eighth coefficient The tenth coefficient The twelfth coefficient S4 (0) 0.00(104)5263 6.3(0E-)05 -2.(11E)-05 1.9(2E-)06 -7.(83E)-08 S5 0 0.001497638 -1.86E-05 -1.21E-06 -5.65E-07 3.85E-08 S9 0 0.005401982 -4.42E-04 1.54E-08 6.99E-06 -1.24E-06 S10 0 -0.000320078 1.01E-05 -9.72E-06 -4.50E-06 -6.99E-07 S12 0 -0.000949189 -5.73E-05 -1.06E-05 -1.84E-06 -7.99E-08 S13 0 0.002971337 5.63E-07 2.15E-06 1.99E-06 -2.66E-07 S14 0 8.08E-04 2.22E-04 9.59E-06 -2.39E-06 -5.87E-07 S15 0 -0.000245536 -1.15E-04 -1.22E-05 -8.45E-07 1.66E-08 S16 0 -0.002447921 -1.19E-04 -6.54E-06 1.03E-06 6.85E-08 S17 0 -0.001864786 4.16E-05 1.19E-05 -1.68E-06 1.50E-07

[0208] Furthermore, the optical imaging system configured as described above may have Figure 6 and Figure 8 Aberration characteristics shown in .

[0209] Will refer to Figures 9 to 12 A third example of an optical imaging system is described.

[0210] Fig. 9 is a diagram showing a state in which the optical imaging system has a first focal length, and Fig.11 is a diagram showing a state in which the optical imaging system has a second focal length.

[0211] The optical imaging system in the third example may include a first lens 310 , a second lens 320 , a third lens 330 , a fourth lens 340 , a fifth lens 350 , and a sixth lens 360 .

[0212] The optical imaging system in the third example can form a focus on the imaging surface 380 .

[0213] In addition, the optical imaging system may further include an optical filter 370 and an image sensor IS. In addition, a stop may be disposed between the third lens 330 and the fourth lens 340 .

[0214] In addition, the optical imaging system may further include a first reflective member R1 disposed at the front side of the first lens 310 and having a reflective surface for changing the optical path. The first reflective member R1 may be implemented by a prism or may be provided as a reflective mirror.

[0215] exist Fig. 9 and Fig.11 In FIG. 5 , the prism, ie, the first reflective member R1 , may have a flat plate shape, but an actual prism may have a triangular columnar shape.

[0216] Light incident to the first reflective member R1 may be reflected by the first reflective member R1 and may pass through the first to sixth lenses 310 to 360. For example, light incident to the first reflective member R1 along the first optical axis may be reflected toward a second optical axis perpendicular to the first optical axis.

[0217] In addition, the optical imaging system may further include a second reflective member R2 and a third reflective member R3 disposed at the rear side of the sixth lens 360 and each having a reflective surface for changing the optical path. The second reflective member R2 and the third reflective member R3 may be disposed between the sixth lens 360 and the image sensor IS.

[0218] The second reflective member R2 and the third reflective member R3 may be implemented as reflectors, or may be configured as prisms. Fig.21 As shown in FIG. 4 , the second reflective member R2 and the third reflective member R3 may be provided in the form of a single prism R2 ′ having two reflective surfaces.

[0219] The light passing through the first to sixth lenses 310 to 360 may be reflected by the second reflective member R2. For example, the light passing through the first to sixth lenses 310 to 360 may be reflected by the second reflective member R2 toward a third optical axis perpendicular to the second optical axis. The second reflective member R2 may have a reflective surface for reflecting the light to the third optical axis perpendicular to the second optical axis.

[0220] The light reflected by the second reflection member R2 may be reflected again by the third reflection member R3. For example, the light reflected by the second reflection member R2 toward the third optical axis may be reflected by the third reflection member R3 toward a fourth optical axis perpendicular to the third optical axis and may be received in the image sensor IS. The third reflection member R3 may have a reflection surface for reflecting light to the fourth optical axis perpendicular to the third optical axis.

[0221] The second optical axis and the fourth optical axis may be parallel to each other.

[0222] The filter 370 may be disposed between the third reflective member R3 and the image sensor IS.

[0223] At least one of the first to sixth lenses 310 to 360 may be a variable lens having a variable focal length. For example, the second lens 320 may be a variable lens. The second lens 320 may include a liquid lens 321 and a plane lens 323 attached to the image side surface of the liquid lens 321.

[0224] The curvature radius and thickness of the object-side surface of the liquid lens 321 may be changed. Therefore, the focal length of the liquid lens 321 may be changed. The thickness may refer to the thickness on the optical axis.

[0225] When the focal length of the second lens 320 changes, the focal length of the optical imaging system may also change.

[0226] Even when the first to sixth lenses 310 to 360 do not move, the focal length of the optical imaging system can be changed by changing the focal length of the second lens 320, so that a zoom effect can be easily achieved.

[0227] Since the focal length of the optical imaging system changes, the second reflective member R2 and the third reflective member R3 may move to form a focus on the imaging surface 380. For example, when the second reflective member R2 and the third reflective member R3 move, the distance between the sixth lens 360 and the second reflective member R2 may change, and the distance between the third reflective member R3 and the image sensor IS (or the imaging surface 380) may also change.

[0228] Here, "distance" may refer to the distance on the optical axis between two members.

[0229] The second reflective member R2 and the third reflective member R3 may move together. Therefore, the distance on the optical axis between the second reflective member R2 and the third reflective member R3 may not change.

[0230] The length of the optical path may be changed by movement of the second and third reflective members R2 and R3.

[0231] The first reflecting member R1 and the first to sixth lenses 310 to 360 may be fixed members whose positions may be fixed, and the second and third reflecting members R2 and R3 may be movable members whose positions may be changed.

[0232] The characteristics of each lens (radius of curvature, thickness of the lens or distance between lenses, refractive index and Abbe number) can be listed in Table 9.

[0233] In Table 9, the refractive indices of the second and third reflective members R2 and R3 may be represented by negative numbers, which may mean that the second and third reflective members R2 and R3 may have reflective surfaces for reflecting light.

[0234] [Table 9]

[0235]

[0236]

[0237] [Table 10]

[0238] At the first focal length At the second focal length r3 17.709 -16.505 D12 1.0147 1.3824 T2 2.1774 1.8096 D6R 3 13.9994 DR3F 6.1990 17.1984

[0239] The definitions of r3, D12, T2, D6R, and DR3F may be the same as in the first example.

[0240] [Table 11]

[0241] At the first focal length At the second focal length f 16.8083 28.9971 f1 127.387693 127.387693 f2 59.4261745 -55.38590604 f3 -7.40568 -7.40568 f4 8.7946 8.7946 f5 -12.01742 -12.01742 f6 8.50535 8.50535

[0242] The definitions of f, f1, f2, f3, f4, f5, and f6 may be the same as those of the first example.

[0243] In a third example, the first lens 310 may have positive refractive power, a first surface of the first lens 310 may be a concave surface, and a second surface of the first lens 310 may be a convex surface.

[0244] The second lens 320 may be a variable lens whose focal length may be changed. For example, the second lens 320 may have a first focal length and a second focal length. The second lens 320 may include a liquid lens 321 and a plane lens 323 attached to the image side surface of the liquid lens 321.

[0245] When the second lens 320 has the first focal length, the second lens 320 may have positive refractive power. In addition, the first surface of the second lens 320 (e.g., the object-side surface of the liquid lens 321) may be a convex surface, and the second surface of the second lens 320 (e.g., the image-side surface of the plane lens 323) may be a plane.

[0246] When the second lens 320 has the second focal length, the second lens 320 may have negative refractive power. In addition, the first surface of the second lens 320 may be a concave surface, and the second surface of the second lens 320 may be a flat surface.

[0247] The third lens 330 may have negative refractive power, and the first and second surfaces of the third lens 330 may be concave surfaces.

[0248] The fourth lens 340 may have positive refractive power, and the first and second surfaces of the fourth lens 340 may be convex surfaces.

[0249] The fifth lens 350 may have negative refractive power, a first surface of the fifth lens 350 may be a convex surface, and a second surface of the fifth lens 350 may be a concave surface.

[0250] The sixth lens 360 may have positive refractive power, and the first and second surfaces of the sixth lens 360 may be convex surfaces.

[0251] Each surface of the first lens 310 and the third to sixth lenses 330 to 360 may have an aspherical coefficient as shown in Table 12. For example, the object-side surface and the image-side surface of the first lens 310 and the third to sixth lenses 330 to 360 may be aspherical surfaces.

[0252] [Table 12]

[0253] Cone constant The fourth coefficient The sixth coefficient The eighth coefficient The tenth coefficient The twelfth coefficient S4 (0) 0.00(096)6697 3.7(3E-)05 1.1(8E-)05 -1.(31E)-06 3.0(0E)-08 S5 0 0.001076464 3.37E-05 3.97E-06 -2.54E-07 -6.51E-09 S9 0 0.003884349 2.92E-05 4.69E-06 -1.96E-06 2.03E-08 S10 0 0.000156127 3.51E-05 2.73E-06 -2.26E-07 -4.52E-08 S12 0 -0.000928506 -7.13E-05 -4.84E-06 -4.12E-07 -2.81E-08 S13 0 0.001521104 3.09E-05 7.87E-07 -7.52E-07 -1.77E-07 S14 0 -2.14E-07 7.58E-05 5.53E-06 -1.58E-07 -9.24E-08 S15 0 -0.000186781 -6.07E-05 -6.72E-06 -5.12E-08 6.80E-08 S16 0 -0.000727204 -4.63E-05 -3.13E-06 3.59E-07 1.51E-09 S17 0 -0.000664569 2.93E-05 -7.26E-07 1.17E-06 -9.47E-08

[0254] Furthermore, the optical imaging system configured as described above may have Figures 10 to 12 Aberration characteristics shown in .

[0255] Will refer to Figures 13 to 16 A fourth example of an optical imaging system is described.

[0256] Fig.13 is a diagram showing a state in which the optical imaging system has a first focal length, and Fig.15 is a diagram showing a state in which the optical imaging system has a second focal length.

[0257] The optical imaging system in the fourth example may include a first lens 410 , a second lens 420 , a third lens 430 , a fourth lens 440 , a fifth lens 450 , and a sixth lens 460 .

[0258] The optical imaging system in the fourth example can form a focus on the imaging surface 480 .

[0259] In addition, the optical imaging system may further include an optical filter 470 and an image sensor IS. In addition, a stop may be disposed between the third lens 430 and the fourth lens 340 .

[0260] In addition, the optical imaging system may further include a first reflective member R1 disposed at the front side of the first lens 410 and having a reflective surface for changing the optical path. In the fourth example, the first reflective member R1 may be implemented by a prism or may be provided as a reflective mirror.

[0261] exist Fig.13 and Fig.15 In FIG. 5 , the prism, ie, the first reflective member R1 , may have a flat plate shape, but an actual prism may have a triangular columnar shape.

[0262] Light incident to the first reflective member R1 may be reflected by the first reflective member R1 and may pass through the first to sixth lenses 410 to 460. For example, light incident to the first reflective member R1 along the first optical axis may be reflected toward a second optical axis perpendicular to the first optical axis.

[0263] In addition, the optical imaging system may further include a second reflective member R2 and a third reflective member R3 disposed at the rear side of the sixth lens 460 and each having a reflective surface for changing the optical path. The second reflective member R2 and the third reflective member R3 may be disposed between the sixth lens 460 and the image sensor IS.

[0264] The second reflective member R2 and the third reflective member R3 may be implemented as reflectors, or may be configured as prisms. Fig.21 As shown in FIG. 4 , the second reflective member R2 and the third reflective member R3 may be provided in the form of a single prism R2 ′ having two reflective surfaces.

[0265] The light passing through the first to sixth lenses 410 to 460 may be reflected by the second reflective member R2. For example, the light passing through the first to sixth lenses 410 to 460 may be reflected by the second reflective member R2 toward a third optical axis perpendicular to the second optical axis. The second reflective member R2 may have a reflective surface for reflecting the light to the third optical axis perpendicular to the second optical axis.

[0266] The light reflected by the second reflection member R2 may be reflected again by the third reflection member R3. For example, the light reflected by the second reflection member R2 toward the third optical axis may be reflected by the third reflection member R3 toward a fourth optical axis perpendicular to the third optical axis and may be received in the image sensor IS. The third reflection member R3 may have a reflection surface for reflecting light to the fourth optical axis perpendicular to the third optical axis.

[0267] The second optical axis and the fourth optical axis may be parallel to each other.

[0268] The filter 470 may be disposed between the third reflective member R3 and the image sensor IS.

[0269] At least one of the first to sixth lenses 410 to 460 may be a variable lens having a variable focal length. For example, the second lens 420 may be a variable lens. The second lens 420 may include a liquid lens 421 and a plane lens 423 attached to the image side surface of the liquid lens 421.

[0270] The curvature radius and thickness of the object-side surface of the liquid lens 421 may be changed. Therefore, the focal length of the liquid lens 421 may be changed. The thickness may refer to the thickness on the optical axis.

[0271] When the focal length of the second lens 420 changes, the focal length of the optical imaging system may also change.

[0272] Even when the first to sixth lenses 410 to 460 do not move, the focal length of the optical imaging system can be changed by changing the focal length of the second lens 420, so that a zoom effect can be easily achieved.

[0273] Since the focal length of the optical imaging system changes, the second reflective member R2 and the third reflective member R3 may move to form a focus on the imaging surface 480. For example, when the second reflective member R2 and the third reflective member R3 move, the distance between the sixth lens 460 and the second reflective member R2 may change, and the distance between the third reflective member R3 and the image sensor IS (or the imaging surface 480) may also change.

[0274] Here, "distance" may refer to the distance on the optical axis between two members.

[0275] The second reflective member R2 and the third reflective member R3 may move together. Therefore, the distance on the optical axis between the second reflective member R2 and the third reflective member R3 may not change.

[0276] The length of the optical path may be changed by movement of the second and third reflective members R2 and R3.

[0277] The first reflecting member R1 and the first to sixth lenses 410 to 460 may be fixed members whose positions may be fixed, and the second and third reflecting members R2 and R3 may be movable members whose positions may be changed.

[0278] The characteristics of each lens (radius of curvature, thickness of the lens or distance between lenses, refractive index and Abbe number) can be listed in Table 13.

[0279] In Table 13, the refractive indices of the second and third reflective members R2 and R3 may be represented by negative numbers, which may mean that the second and third reflective members R2 and R3 may have reflective surfaces for reflecting light.

[0280] [Table 13]

[0281]

[0282] [Table 14]

[0283]

[0284] The definitions of r3, D12, T2, D6R, and DR3F may be the same as in the first example.

[0285] [Table 15]

[0286] At the first focal length At the second focal length f 16.8032 29.1086 f1 113.20688 113.20688 f2 65.60402685 -48.72483221 f3 -7.419199 -7.419199 f4 8.840524 8.840524 f5 -12.352182 -12.352182 f6 8.549017 8.549017

[0287] The definitions of f, f1, f2, f3, f4, f5, and f6 may be the same as those of the first example.

[0288] In a fourth example, the first lens 410 may have positive refractive power, a first surface of the first lens 410 may be a concave surface, and a second surface of the first lens 410 may be a convex surface.

[0289] The second lens 420 may be a variable lens whose focal length may be changed. For example, the second lens 420 may have a first focal length and a second focal length. The second lens 420 may include a liquid lens 421 and a plane lens 423 attached to the image side surface of the liquid lens 421.

[0290] When the second lens 420 has the first focal length, the second lens 420 may have positive refractive power. In addition, the first surface of the second lens 420 (e.g., the object-side surface of the liquid lens 421) may be a convex surface, and the second surface of the second lens 420 (e.g., the image-side surface of the plane lens 423) may be a plane.

[0291] When the second lens 420 has the second focal length, the second lens 420 may have negative refractive power. In addition, the first surface of the second lens 420 may be a concave surface, and the second surface of the second lens 420 may be a flat surface.

[0292] The third lens 430 may have negative refractive power, and the first and second surfaces of the third lens 430 may be concave surfaces.

[0293] The fourth lens 440 may have positive refractive power, and the first and second surfaces of the fourth lens 440 may be convex surfaces.

[0294] The fifth lens 450 may have negative refractive power, a first surface of the fifth lens 450 may be a convex surface, and a second surface of the fifth lens 450 may be a concave surface.

[0295] The sixth lens 460 may have positive refractive power, and the first and second surfaces of the sixth lens 460 may be convex surfaces.

[0296] Each surface of the first lens 410 and the third to sixth lenses 430 to 460 may have an aspherical coefficient as shown in Table 16. For example, the object-side surface and the image-side surface of the first lens 410 and the third to sixth lenses 430 to 460 may be aspherical surfaces.

[0297] [Table 16]

[0298] Cone constant The fourth coefficient The sixth coefficient The eighth coefficient The tenth coefficient The twelfth coefficient S4 (0) 0.00(065)2593 5.3(5E-)05 -3.(79E)-06 6.0(2E-)07 -3.(07E)-08 S5 0 0.000813573 2.75E-05 -6.85E-07 1.72E-07 -8.27E-09 S9 0 0.001658673 -4.07E-05 5.82E-06 -6.04E-07 2.16E-08 S10 0 -0.000244908 -1.22E-05 2.25E-07 -3.68E-07 8.88E-08 S12 0 -0.000306098 -2.19E-05 -3.21E-06 -2.10E-07 -1.01E-08 S13 0 0.000438819 -1.06E-05 1.78E-06 -3.17E-07 -7.66E-08 S14 0 -1.13E-04 2.32E-05 5.83E-07 -1.35E-07 2.95E-08 S15 0 -3.06757E-05 -3.47E-05 -5.57E-06 -6.93E-08 1.84E-08 S16 0 -0.000336051 -2.57E-05 -2.82E-06 7.91E-08 -3.23E-08 S17 0 5.02056E-06 5.45E-05 -7.66E-06 1.59E-06 -1.21E-07

[0299] In addition, the optical imaging system configured as described above may have Fig.14 and Fig.16 Aberration characteristics shown in .

[0300] Will refer to Figures 17 to 20 A fifth example of an optical imaging system is described.

[0301] Fig.17 is a diagram showing a state in which the optical imaging system has a first focal length, and Fig.19 is a diagram showing a state in which the optical imaging system has a second focal length.

[0302] The optical imaging system in the fifth example may include a first lens 510 , a second lens 520 , a third lens 530 , a fourth lens 540 , a fifth lens 550 , and a sixth lens 560 .

[0303] The optical imaging system in the fifth example can form a focus on the imaging surface 580 .

[0304] In addition, the optical imaging system may further include an optical filter 570 and an image sensor IS. In addition, a stop may be disposed between the second lens 520 and the third lens 530 .

[0305] In addition, the optical imaging system may further include a first reflective member R1 disposed at the front side of the first lens 510 and having a reflective surface for changing the optical path. In the fifth example, the first reflective member R1 may be implemented by a prism or may be provided as a reflective mirror.

[0306] exist Fig.17 and Fig.19 In FIG. 5 , the prism, ie, the first reflective member R1 , may have a flat plate shape, but an actual prism may have a triangular columnar shape.

[0307] Light incident to the first reflective member R1 may be reflected by the first reflective member R1 and may pass through the first to sixth lenses 510 to 560. For example, light incident to the first reflective member R1 along the first optical axis may be reflected toward a second optical axis perpendicular to the first optical axis.

[0308] In addition, the optical imaging system may further include a second reflective member R2 and a third reflective member R3 disposed at the rear side of the sixth lens 560 and each having a reflective surface for changing the optical path. The second reflective member R2 and the third reflective member R3 may be disposed between the sixth lens 560 and the image sensor IS.

[0309] The second reflective member R2 and the third reflective member R3 may be implemented as reflectors, or may be configured as prisms. Fig.21 As shown in FIG. 4 , the second reflective member R2 and the third reflective member R3 may be provided in the form of a single prism R2 ′ having two reflective surfaces.

[0310] The light passing through the first to sixth lenses 510 to 560 may be reflected by the second reflective member R2. For example, the light passing through the first to sixth lenses 510 to 560 may be reflected by the second reflective member R2 toward a third optical axis perpendicular to the second optical axis. The second reflective member R2 may have a reflective surface for reflecting the light to the third optical axis perpendicular to the second optical axis.

[0311] The light reflected by the second reflection member R2 may be reflected again by the third reflection member R3. For example, the light reflected by the second reflection member R2 toward the third optical axis may be reflected by the third reflection member R3 toward a fourth optical axis perpendicular to the third optical axis and may be received in the image sensor IS. The third reflection member R3 may have a reflection surface for reflecting light to the fourth optical axis perpendicular to the third optical axis.

[0312] The second optical axis and the fourth optical axis may be parallel to each other.

[0313] The filter 570 may be disposed between the third reflective member R3 and the image sensor IS.

[0314] At least one of the first to sixth lenses 510 to 560 may be a variable lens having a variable focal length. For example, the sixth lens 560 may be a variable lens. The sixth lens 560 may include a liquid lens 561 and a plane lens 563 attached to the image side surface of the liquid lens 561.

[0315] The curvature radius and thickness of the object-side surface of the liquid lens 561 may be changed. Therefore, the focal length of the liquid lens 561 may be changed. The thickness may refer to the thickness on the optical axis.

[0316] When the focal length of the sixth lens 560 changes, the focal length of the optical imaging system may also change.

[0317] Even when the first to sixth lenses 510 to 560 do not move, the focal length of the optical imaging system can be changed by changing the focal length of the sixth lens 560, so that a zoom effect can be easily achieved.

[0318] Since the focal length of the optical imaging system changes, the second reflective member R2 and the third reflective member R3 may move to form a focus on the imaging surface 580. For example, when the second reflective member R2 and the third reflective member R3 move, the distance between the sixth lens 560 and the second reflective member R2 may change, and the distance between the third reflective member R3 and the image sensor IS (or the imaging surface 580) may also change.

[0319] Here, "distance" may refer to the distance on the optical axis between two members.

[0320] The second reflective member R2 and the third reflective member R3 may move together. Therefore, the distance on the optical axis between the second reflective member R2 and the third reflective member R3 may not change.

[0321] The length of the optical path may be changed by movement of the second and third reflective members R2 and R3.

[0322] The first reflecting member R1 and the first to sixth lenses 510 to 560 may be fixed members whose positions may be fixed, and the second and third reflecting members R2 and R3 may be movable members whose positions may be changed.

[0323] The characteristics of each lens (radius of curvature, thickness of the lens or distance between lenses, refractive index and Abbe number) can be listed in Table 17.

[0324] In Table 17, the refractive indices of the second and third reflective members R2 and R3 may be represented by negative numbers, which may mean that the second and third reflective members R2 and R3 may have reflective surfaces for reflecting light.

[0325] [Table 17]

[0326]

[0327]

[0328] [Table 18]

[0329] At the first focal length At the second focal length R11 18.5 -42.86 D56 1.7982 2.2484 T6 1.8151 1.3649 D6R 3 13.1809 DR3F 7.5469 17.7278

[0330] R11 is the radius of curvature of the object-side surface of the sixth lens 560, D56 is the distance on the optical axis from the image-side surface of the fifth lens 550 to the object-side surface of the sixth lens 560, T6 is the thickness of the liquid lens 561 of the sixth lens 560 on the optical axis, D6R is the distance on the optical axis from the image-side surface of the sixth lens 560 to the second reflective member R2, and DR3F is the distance on the optical axis between the third reflective member R3 and the filter 570.

[0331] [Table 19]

[0332] At the first focal length At the second focal length f 16.1726 31.755 f1 48.216963 48.216963 f2 -7.503543 -7.503543 f3 12.38179 12.38179 f4 -8.47084 -8.47084 f5 7.339655 7.339655 f6 62.10051479 -143.871787

[0333] The definitions of f, f1, f2, f3, f4, f5, and f6 may be the same as those of the first example.

[0334] In a fifth example, the first lens 510 may have positive refractive power, a first surface of the first lens 510 may be a concave surface, and a second surface of the first lens 510 may be a convex surface.

[0335] The second lens 520 may have negative refractive power, and the first and second surfaces of the second lens 520 may be concave surfaces.

[0336] The third lens 530 may have positive refractive power, a first surface of the third lens 530 may be a concave surface, and a second surface of the third lens 530 may be a convex surface.

[0337] The fourth lens 540 may have negative refractive power, and the first and second surfaces of the fourth lens 540 may be concave surfaces.

[0338] The fifth lens 550 may have positive refractive power, and the first and second surfaces of the fifth lens 550 may be convex surfaces.

[0339] The sixth lens 560 may be a variable lens whose focal length may be changed. For example, the sixth lens 560 may have a first focal length and a second focal length. The sixth lens 560 may include a liquid lens 561 and a plane lens 563 attached to the image side surface of the liquid lens 561.

[0340] When the sixth lens 560 has the first focal length, the sixth lens 560 may have positive refractive power. In addition, the first surface of the sixth lens 560 (e.g., the object-side surface of the liquid lens 561) may be a convex surface, and the second surface of the sixth lens 560 (e.g., the image-side surface of the plane lens 563) may be a plane.

[0341] When the sixth lens 560 has the second focal length, the sixth lens 560 may have negative refractive power. In addition, a first surface of the sixth lens 560 may be a concave surface, and a second surface of the sixth lens 560 may be a flat surface.

[0342] Each surface of the first to fifth lenses 510 to 550 may have an aspherical coefficient as shown in Table 20. For example, the object-side surface and the image-side surface of the first to fifth lenses 510 to 550 may be aspherical surfaces.

[0343] [Table 20]

[0344] Cone constant The fourth coefficient The sixth coefficient The eighth coefficient The tenth coefficient The twelfth coefficient S4 (0) 0.00(063)5779 -3.(37E)-05 -3.(03E)-06 -1.(12E)-06 (1).1(0E)-0(7) S5 0 0.000954221 -1.28E-06 -9.04E-06 -1.29E-07 4.93E-08 S6 0 0.000729294 6.23E-06 4.76E-06 -3.62E-06 4.47E-07 S7 0 -2.54065E-05 -1.60E-05 7.30E-07 7.67E-07 2.38E-07 S9 0 -0.000446111 -1.80E-05 -2.82E-06 -9.16E-07 3.34E-08 S10 0 0.000274266 -1.60E-05 -4.55E-07 -4.24E-07 -1.59E-07 S11 0 -3.61E-04 -1.95E-05 -2.95E-06 -6.71E-07 8.96E-08 S12 0 -7.11911E-06 -2.15E-05 -5.05E-06 8.04E-08 -7.97E-09 S13 0 -1.57883E-05 -3.65E-06 -1.12E-06 5.44E-08 3.74E-09 S14 0 8.26479E-05 2.76E-05 -1.17E-06 2.36E-07 4.49E-09

[0345] Furthermore, the optical imaging system configured as described above may have Fig.18 and Fig. 20 Aberration characteristics shown in .

[0346] According to the above example, the optical imaging system can achieve a zoom function by changing the focal length.

[0347] Although the present disclosure includes specific examples, it will be apparent to those of ordinary skill in the art that various changes in form and detail may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are considered to be illustrative only and not for limiting purposes. The description of features or aspects in each example is considered to be applicable to similar features or aspects in other examples. Suitable results may be obtained 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 different ways and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of the present disclosure is not limited by the detailed description, but by the claims and their equivalents, and all changes within the scope of the claims and their equivalents will be interpreted as included in the present disclosure.

Claims

1. An optical imaging system, comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, arranged in sequence along the optical axis; a first reflecting member, disposed at the object side of the first lens; and a plurality of reflecting members, disposed at the image side of the sixth lens, wherein the total number of lenses having refractive power in the optical imaging system is six, wherein the first lens has a positive refractive power and a concave object-side surface, wherein the second lens or the sixth lens is a variable lens having a variable focal length, wherein each of the plurality of reflecting members is configured to move together as the focal length of the variable lens changes, wherein the variable lens is configured to have a first focal length or a second focal length as the focal length changes, wherein the first focal length is positive and the second focal length is negative, the variable lens includes a liquid lens and a plano lens attached to the image-side surface of the liquid lens, and wherein when the variable lens has the second focal length, the thickness of the liquid lens on the optical axis is less than the thickness of the liquid lens on the optical axis when the variable lens has the first focal length.

2. The optical imaging system according to claim 1, wherein: The curvature radius of the object-side surface of the liquid lens is variable.

3. The optical imaging system according to claim 2, in, when the variable lens has the first focal length, the curvature radius of the object-side surface of the liquid lens is positive, and wherein when the variable lens has the second focal length, the curvature radius of the object-side surface of the liquid lens is negative.

4. The optical imaging system according to claim 1, in, the variable lens is the second lens, and wherein the second lens has a positive refractive power or a negative refractive power, the third lens has a negative refractive power, the fourth lens has a positive refractive power, the fifth lens has a negative refractive power, and the sixth lens has a positive refractive power.

5. The optical imaging system according to claim 1, in, the variable lens is the sixth lens, and wherein the second lens has a negative refractive power, the third lens has a positive refractive power, the fourth lens has a negative refractive power, the fifth lens has a positive refractive power, and the sixth lens has a positive refractive power or a negative refractive power.

6. The optical imaging system according to claim 1, in, the plurality of reflecting members includes a second reflecting member and a third reflecting member, and wherein the second reflecting member includes a reflecting surface configured to reflect light in a direction perpendicular to the optical axis, and the third reflecting member includes a reflecting surface configured to reflect the light reflected by the second reflecting member in a direction parallel to the optical axis.

7. The optical imaging system according to claim 6, wherein: The second reflecting member and the third reflecting member are configured to move together.

8. The optical imaging system according to claim 1, wherein: 10 < fv_1 / D6R_1, where fv_1 is the first focal length of the variable lens, and D6R_1 is the distance on the optical axis from the sixth lens to the reflecting member closest to the sixth lens among the plurality of reflecting members when the variable lens has the first focal length.

9. The optical imaging system according to claim 1, wherein: -15 < fv_2 / D6R_2 < -3, where fv_2 is the second focal length of the variable lens, and D6R_2 is the distance on the optical axis from the sixth lens to the reflecting member closest to the sixth lens among the plurality of reflecting members when the variable lens has the second focal length.

10. The optical imaging system according to claim 1, wherein: -7 < (fv_1 × D6R_2) / (fv_2 × D6R_1) < -1, where fv_1 is the first focal length of the variable lens, fv_2 is the second focal length of the variable lens, D6R_1 is the distance on the optical axis from the sixth lens to the reflecting member closest to the sixth lens among the plurality of reflecting members when the variable lens has the first focal length, and D6R_2 is the distance on the optical axis from the sixth lens to the reflecting member closest to the sixth lens when the variable lens has the second focal length.

11. The optical imaging system according to claim 1, wherein: -3 < fv_2 / fv_1 < 0, where fv_1 is the first focal length of the variable lens, and fv_2 is the second focal length of the variable lens.

12. The optical imaging system according to claim 1, in, 3 < D6R_2 / D6R_1 < 6, where D6R_1 is the distance on the optical axis from the sixth lens to the reflecting member closest to the sixth lens among the plurality of reflecting members when the variable lens has the first focal length, and D6R_2 is the distance on the optical axis from the sixth lens to the reflecting member closest to the sixth lens when the variable lens has the second focal length.

13. The optical imaging system according to claim 1, wherein: 0 < L1 / TTL1 < 1, where L1 is the linear distance in a direction parallel to the optical axis from the object-side surface of the first lens to the imaging surface when the variable lens has the first focal length, and TTL1 is the distance on the optical axis from the object-side surface of the first lens to the imaging surface when the variable lens has the first focal length.

14. The optical imaging system according to claim 1, wherein: 0 < L2 / TTL2 < 1, where L2 is the linear distance in a direction parallel to the optical axis from the object-side surface of the first lens to the imaging surface when the variable lens has the second focal length, and TTL2 is the distance on the optical axis from the object-side surface of the first lens to the imaging surface when the variable lens has the second focal length.

15. The optical imaging system of claim 1, wherein: 1<(L1×TTL2) / (L2×TTL1)<3, wherein L1 is a linear distance from the object-side surface of the first lens to the imaging surface in a direction parallel to the optical axis when the variable lens has the first focal length, L2 is a linear distance from the object-side surface of the first lens to the imaging surface in a direction parallel to the optical axis when the variable lens has the second focal length, TTL1 is a distance from the object-side surface of the first lens to the imaging surface on the optical axis when the variable lens has the first focal length, and TTL2 is a distance from the object-side surface of the first lens to the imaging surface on the optical axis when the variable lens has the second focal length.

Images