Optical imaging system and electronic device

Abstract

The present disclosure relates to an optical imaging system including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in order from an object side toward an imaging plane, and wherein one of the first to sixth lenses is a variable focal length lens configured to have a variable focal length. The invention further relates to electronic equipment which comprises the optical imaging system.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2021-0174344 filed in the Korean Intellectual Property Office on December 8, 2021, the disclosure of which is incorporated herein in its entirety by reference for all purposes. Technical Field

[0003] The present disclosure relates to an optical imaging system including a variable focal length lens configured to have an adjustable focal length. Background Art

[0004] The camera module may include an optical imaging system. The optical imaging system of the camera module may have a predetermined focal length. For example, the focal length of the optical imaging system may be determined by a lens constituting the optical imaging system. The camera module may be configured to adjust (auto focus (AF)) the focal length of the optical imaging system for clear image capture. For example, the camera module may adjust the focal length of the camera module by moving the optical imaging system in the direction of the optical axis. However, the camera module having the above structure may be configured to have a relatively large size to move the optical imaging system in the direction of the optical axis, and therefore it may be difficult to miniaturize the camera module and reduce the weight of the camera module.

[0005] The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with respect to the present disclosure. Summary of the invention

[0006] The purpose of providing this summary is to introduce a selection of inventive concepts in a concise form, and these inventive concepts will be further described in the following detailed description. This summary is not intended to identify the key features or essential features of the subject matter claimed, nor is it intended to help determine the scope of the subject matter claimed.

[0007] In one general aspect, an optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially from an object side toward an imaging plane, wherein the object side surface of the sixth lens is convex, and wherein one of the first to sixth lenses is a variable focal length lens configured to have a variable focal length.

[0008] The image-side surface of the first lens may be convex.

[0009] The image-side surface of the second lens may be concave.

[0010] The third lens may be configured as a variable focal length lens.

[0011] The image-side surface of the fourth lens may be convex.

[0012] The object-side surface of the fifth lens may be convex.

[0013] The image-side surface of the sixth lens may be concave.

[0014] SD / TD may be greater than 0.8, where SD is a distance from the stop to the image side surface of the sixth lens, and TD is a distance from the object side surface of the first lens to the image side surface of the sixth lens.

[0015] T1 / TTL may be greater than 0.07 and less than 0.20, where T1 is the thickness of the first lens, and TTL is the distance from the object-side surface of the first lens to the imaging surface.

[0016] V1-V2 may be greater than 25 and less than 45, where V1 is the Abbe number of the first lens, and V2 is the Abbe number of the second lens.

[0017] LD / TD may be greater than 0.5 and less than 0.8, where LD is a distance from the object side surface of the variable focal length lens to the image side surface of the sixth lens, and TD is a distance from the object side surface of the first lens to the image side surface of the sixth lens.

[0018] fv may be greater than -500 mm and less than 50.0 mm, where fv is the focal length of the variable focus lens.

[0019] L1S1E / T1 may be less than 2.0, where L1S1E is an effective diameter of the object-side surface of the first lens, and T1 is a thickness of the first lens.

[0020] D12 / f may be less than 0.2, where D12 is the distance from the image side surface of the first lens to the object side surface of the second lens, and f is the focal length of the optical imaging system.

[0021] L3S1ER may be less than 1.5 mm, where L3S1ER is an effective radius of the object side surface of the third lens.

[0022] The electronic device may include a camera module including an optical imaging system, wherein the optical imaging system may further include an image sensor having a surface on which the imaging plane is formed.

[0023] In another general aspect, an optical imaging system includes a first lens having a refractive power, a second lens having a refractive power, a third lens having a refractive power, a fourth lens having a convex object side and a convex image side, a fifth lens having a convex object side, and a sixth lens having a refractive power, wherein the first lens to the sixth lens are arranged in order from the object side, and wherein 0.001 < |f1 / f6| < 0.026, where f1 is the focal length of the first lens, and f6 is the focal length of the sixth lens.

[0024] In another general aspect, an optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in order from the object side toward the imaging surface, wherein the third lens is a variable focal length lens configured to have a variable focal length, and wherein 0.07 < T1 / TTL < 0.20, where T1 is the thickness of the first lens, and TTL is the distance from the object side surface of the first lens to the imaging surface.

[0025] Other features and aspects will become apparent in light of the appended claims, the drawings, and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a view showing an optical imaging system according to a first exemplary embodiment of the present disclosure.

[0027] Figure 2 presents a graph having curves representing Figure 1 the aberration characteristics of the optical imaging system shown.

[0028] Figure 3 is a view showing an optical imaging system according to a second exemplary embodiment of the present disclosure.

[0029] Figure 4 presents a graph having curves representing Figure 3 the aberration characteristics of the optical imaging system shown.

[0030] Figure 5 is a view showing an optical imaging system according to a third exemplary embodiment of the present disclosure.

[0031] Figure 6 presents a graph having curves representing Figure 5 the aberration characteristics of the optical imaging system shown.

[0032] Figure 7 is a view showing an optical imaging system according to a fourth exemplary embodiment of the present disclosure.

[0033] Figure 8 presents a graph having curves representing Figure 7A graph showing the aberration characteristics of an optical imaging system.

[0034] Fig. 9 is a view showing an optical imaging system according to a fifth exemplary embodiment of the present disclosure.

[0035] Fig.10 presents a representation Fig. 9 A graph showing the aberration characteristics of an optical imaging system.

[0036] Fig.11 is a view showing an optical imaging system according to a sixth exemplary embodiment of the present disclosure.

[0037] Fig.12 presents a representation Fig.11 A graph showing the aberration characteristics of an optical imaging system.

[0038] Fig.13 is a view showing an optical imaging system according to a seventh exemplary embodiment of the present disclosure.

[0039] Fig.14 presents a representation Fig.13 A graph showing the aberration characteristics of an optical imaging system.

[0040] Fig.15 is a view showing an optical imaging system according to an eighth exemplary embodiment of the present disclosure.

[0041] Fig.16 presents a representation Fig.15 A graph showing the aberration characteristics of an optical imaging system.

[0042] Fig.17 is a view showing an optical imaging system according to a ninth exemplary embodiment of the present disclosure.

[0043] Fig.18 presents a representation Fig.17 A graph showing the aberration characteristics of an optical imaging system.

[0044] Fig.19 is a view showing an optical imaging system according to a tenth exemplary embodiment of the present disclosure.

[0045] Fig. 20 presents a representation Fig.19 A graph showing the aberration characteristics of an optical imaging system.

[0046] Fig.21 is a view showing one form of a variable focal length lens.

[0047] Fig. 22 is a view illustrating a camera module according to an exemplary embodiment.

[0048] Throughout the drawings and detailed description, the same reference numerals refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative sizes, proportions, and depictions of elements in the drawings may be exaggerated. DETAILED DESCRIPTION

[0049] Hereinafter, exemplary embodiments of the present disclosure are described in detail with reference to the accompanying drawings, but it should be noted that examples are not limited thereto.

[0050] The following specific embodiments are 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 after understanding the present disclosure. For example, the order of operations described herein is merely an example, and except for operations that must occur in a specific order, it is not limited to the order set forth herein, but can be changed, which will be apparent after understanding the present disclosure. In addition, for greater clarity and brevity, descriptions of features known in the art may be omitted.

[0051] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein are provided merely to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent after understanding the present disclosure.

[0052] In describing the present disclosure below, words referring to components of the present disclosure will be used in consideration of the functions of the respective components, and thus should not be construed as limiting the technical components of the present disclosure.

[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, the element may be directly “on,” “connected to,” or “coupled to” the other element, or one or more other elements may be present between the element and the other element. Conversely, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, no other elements may be present between the element and the other element.

[0054] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the articles "a", "an" and "the" are intended to include plural forms as well. The words "include", "comprise" and "have" indicate the presence of the 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.

[0055] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items; similarly, "at least one" includes any one of the associated listed items and any combination of any two or more items.

[0056] Although terms such as "first", "second" and "third" may be used herein to describe various members, components, regions, layers or portions, these members, components, regions, layers or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer or portion from another member, component, region, layer or portion. Therefore, without departing from the teachings of the examples described herein, the first member, first component, first region, first layer or first portion mentioned in these examples may also be referred to as the second member, second component, second region, second layer or second portion.

[0057] Spatially relative terms such as "above", "higher", "below", "lower", etc. may be used herein for descriptive convenience to describe the relationship of one element relative to another element as shown in the accompanying drawings. In addition to covering the orientations depicted in the accompanying drawings, these spatially relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the accompanying drawings is flipped, an element described as being "above" or "higher" relative to another element will be "below" or "lower" relative to the other element. Therefore, depending on the spatial orientation of the device, the term "above" covers both orientations of "above" and "below". The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.

[0058] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. 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] It should be noted that herein, use of the word “may” with respect to an example, such as regarding what an example may include or implement, means that there is at least one example in which such feature is included or implemented, and all examples are not limited thereto.

[0060] The features of the examples described herein may be combined in various ways that will be apparent after understanding the present disclosure. In addition, although the examples described herein have various configurations, other configurations that will be apparent after understanding the present disclosure are also possible.

[0061] One aspect of the present disclosure may provide an optical imaging system configured to enable miniaturization and weight reduction of a camera module.

[0062] In the present disclosure, the first lens refers to the lens closest to the object (or subject), and the sixth lens refers to the lens closest to the imaging plane (or image sensor). In addition, the radius of curvature and thickness of the lens, TTL (the distance from the object side of the first lens to the imaging plane), IMG HT (the height of the imaging plane), and the focal length are all expressed in millimeters (mm). The thickness of the lens, the gap between the lenses, and the TTL are values ​​calculated based on the optical axis of the lens. In the description of the lens shape, the meaning of one surface of the lens being convex is that the optical axis portion of the corresponding surface is convex, and the meaning of one surface of the lens being concave is that the optical axis portion of the corresponding surface is concave. Therefore, even in the case where one surface of the lens is described as convex, the edge portion of the lens may also be concave. Similarly, even in the case where one surface of the lens is described as concave, the edge portion of the lens may also be convex.

[0063] The optical imaging system described herein may be configured to be installed in a mobile electronic device. For example, the optical imaging system may be installed in a smart phone, a laptop computer, an augmented reality device, a virtual reality device, a portable game console, etc. However, the application scope and application examples of the optical imaging system described herein are not limited to the above-mentioned electronic devices. For example, the optical imaging system may be applied to an electronic device that provides a narrow installation space but requires high-resolution image capture.

[0064] The optical imaging system according to the first aspect of the present disclosure may include a plurality of lenses arranged sequentially from the object side. For example, the optical imaging system according to the first aspect may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially from the object side toward the imaging surface.

[0065] The optical imaging system according to the first aspect may include a variable focal length lens configured to have a variable focal length. For example, one of the first lens to the sixth lens may be a variable focal length lens. The variable focal length lens may have a focal length within a predetermined range. For example, the variable focal length lens may have a focal length of -1100mm to 60mm. The variable focal length lens may be configured to continuously change its focal length. For example, when the radius of curvature of the image side surface of the variable focal length lens changes arbitrarily in the range of 600mm to -50mm, the variable focal length lens may have any focal length within the above range. As a specific example, the focal length of the variable focal length lens may change to any value within the above range, such as -980mm, -870mm, 10mm or 32mm.

[0066] The optical imaging system according to the first aspect may include a lens whose one surface is convex. For example, the optical imaging system according to the first aspect may include a sixth lens whose object side surface is convex.

[0067] The optical imaging system of the first aspect configured as described above may have multiple focal lengths by means of a variable focal length lens. For example, the focal length of the optical imaging system may be changed by changing the focal length of the variable focal length lens. As an example, when the variable focal length lens has a maximum focal length, the optical imaging system may have a maximum first focal length. As another example, when the variable focal length lens has a normal focal length, the optical imaging system may also have a standard second focal length. As yet another example, when the variable focal length lens has a minimum focal length, the optical imaging system may have a minimum third focal length. The optical imaging system according to the first aspect may capture images of objects located at different distances by means of the first focal length to the third focal length, or perform autofocus of a camera module.

[0068] The variable focal length lens may have a predetermined Abbe number. As an example, the Abbe number of the variable focal length lens may be less than 40. As a specific example, the Abbe number of the variable focal length lens may be greater than 20 and less than 40. The variable focal length lens may have a predetermined refractive index. As an example, the refractive index of the variable focal length lens may be less than 1.6. As a specific example, the refractive index of the variable focal length lens may be greater than 1.5 and less than 1.6.

[0069] The optical imaging system according to the second aspect of the present disclosure may include a plurality of lenses arranged sequentially from the object side. For example, the optical imaging system according to the second aspect may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially from the object side toward the imaging surface.

[0070] The optical imaging system according to the second aspect may include two or more lenses whose at least one surface is convex. For example, the optical imaging system according to the second aspect may include: a fourth lens whose object side surface is convex and whose image side surface is convex; and a fifth lens whose object side surface is convex.

[0071] The optical imaging system according to the second aspect may satisfy a predetermined conditional expression. For example, the optical imaging system according to the second aspect may satisfy the conditional expression: 0.001<|f1 / f6|<0.026, where f1 is the focal length of the first lens, and f6 is the focal length of the sixth lens.

[0072] The optical imaging system according to the third aspect of the present disclosure may be configured to satisfy one or more of the following conditional expressions. As an example, the optical imaging system according to the third aspect may include six lenses, and may satisfy two or more of the following conditional expressions. As another example, the optical imaging system according to the third aspect may include six lenses, and may be configured to satisfy all of the following conditional expressions.

[0073] 0.8 <SD / TD

[0074] 0.07 <T1 / TTL<0.20

[0075] 25 <V1-V2<45

[0076] 0.5 <LD / TD<0.8

[0077] -500mm <fv<50.0mm

[0078] L1S1E / T1<2.0

[0079] D12 / f<0.2

[0080] L3S1ER<1.5mm

[0081] Here, SD is the distance from the aperture to the image side surface of the sixth lens, TD is the distance from the object side surface of the first lens to the image side surface of the sixth lens, T1 is the thickness of the first lens, TTL is the distance from the object side surface of the first lens to the imaging plane, V1 is the Abbe number of the first lens, V2 is the Abbe number of the second lens, LD is the distance from the object side surface of the variable focal length lens to the image side surface of the sixth lens, fv is the focal length of the variable focal length lens, L1S1E is the effective diameter of the object side surface of the first lens, D12 is the distance from the image side surface of the first lens to the object side surface of the second lens, f is the focal length of the optical imaging system, and L3S1ER is the effective radius of the object side surface of the third lens.

[0082] The optical imaging system may satisfy some of the above conditional expressions in a more limited form as follows.

[0083] 1.7 <L1S1E / T1<2.0

[0084] 0.005 <D12 / f<0.01

[0085] 1.0mm <L3S1ER<1.4mm

[0086] The optical imaging system according to the fourth aspect of the present disclosure may be configured to satisfy one or more of the following conditional expressions. As an example, the optical imaging system according to the fourth aspect may include six lenses, and may satisfy two or more of the following conditional expressions. As another example, the optical imaging system according to the fourth aspect may include six lenses, and may be configured to satisfy all of the following conditional expressions.

[0087] -1.2 <f2 / f4<-0.4

[0088] 0.7 <f2 / f5<1.2

[0089] -1.2<(R1+R2) / (R1-R2)<-0.4

[0090] 0.01 <R1 / (R9+R10)<0.12

[0091] 0.6 <R1 / (R11+R12)<1.2

[0092] 8.0<(R9+R10) / (R11+R12)<12.0

[0093] 1.6 <R1 / R11<2.0

[0094] Here, f2 is the focal length of the second lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, R1 is the radius of curvature of the object side surface of the first lens, R2 is the radius of curvature of the image side surface of the first lens, R9 is the radius of curvature of the object side surface of the fifth lens, R10 is the radius of curvature of the image side surface of the fifth lens, R11 is the radius of curvature of the object side surface of the sixth lens, and R12 is the radius of curvature of the image side surface of the sixth lens.

[0095] If necessary, the optical imaging system according to the first to fourth aspects may include one or more lenses having the following characteristics. As an example, the optical imaging system according to the first aspect may include one of the first to sixth lenses having the following characteristics. As another example, the optical imaging system according to the second aspect may include two or more of the first to sixth lenses having the following characteristics. However, the optical imaging system according to the above aspects does not necessarily include a lens having the following characteristics.

[0096] The characteristics of the first to sixth lenses will be described below.

[0097] The first lens may have a predetermined refractive power. For example, the first lens may have a positive refractive power. One surface of the first lens may be convex. For example, the image side surface of the first lens may be convex. The first lens may have an aspherical surface. For example, both surfaces of the first lens may be aspherical. The first lens may be formed of a material having high light transmittance and excellent processability. For example, the first lens may be formed of plastic. However, the material of the first lens is not limited to plastic. For example, the first lens may be formed of glass. The first lens may have a predetermined refractive index. For example, the refractive index of the first lens may be greater than 1.5 and less than 1.6. The first lens may have a predetermined Abbe number. For example, the Abbe number of the first lens may be greater than 50 and less than 60.

[0098] The second lens may have a refractive power. For example, the second lens may have a negative refractive power. One surface of the second lens may be concave. For example, the image side surface of the second lens may be concave. The second lens may have an aspherical surface. For example, both surfaces of the second lens may be aspherical. The second lens may be formed of a material having high light transmittance and excellent processability. For example, the second lens may be formed of plastic. However, the material of the second lens is not limited to plastic. For example, the second lens may be formed of glass. The second lens may have a predetermined refractive index. For example, the refractive index of the second lens may be greater than 1.6 and less than 1.7. The second lens may have a predetermined Abbe number. For example, the Abbe number of the second lens may be greater than 18 and less than 24.

[0099] The third lens may have a refractive power. For example, the third lens may have a positive refractive power or a negative refractive power. The third lens may be configured to enable autofocus of the optical imaging system. For example, the third lens may be configured as a variable focal length lens having a variable focal length.

[0100] The fourth lens may have a refractive power. For example, the fourth lens may have a positive refractive power. One surface of the fourth lens may be convex. For example, the image side surface of the fourth lens may be convex. The fourth lens may have an aspherical surface. For example, the object side surface or the image side surface of the fourth lens may be aspherical. The fourth lens may be formed of a material having high light transmittance and excellent processability. For example, the fourth lens may be formed of plastic. However, the material of the fourth lens is not limited to plastic. The fourth lens may have a predetermined refractive index. For example, the refractive index of the fourth lens may be greater than 1.5 and less than 1.6. The fourth lens may have a predetermined Abbe number. For example, the Abbe number of the fourth lens may be greater than 50 and less than 60.

[0101] The fifth lens may have a refractive power. For example, the fifth lens may have a negative refractive power. One surface of the fifth lens may be convex. For example, the object side surface of the fifth lens may be convex. The fifth lens may have an aspherical surface. For example, the object side surface or the image side surface of the fifth lens may be aspherical. The fifth lens may include an inflection point. For example, the inflection point may be formed on at least one of the object side surface and the image side surface of the fifth lens. The fifth lens may be formed of a material having high light transmittance and excellent processability. For example, the fifth lens may be formed of plastic. However, the material of the fifth lens is not limited to plastic. The fifth lens may have a predetermined refractive index. For example, the refractive index of the fifth lens may be greater than 1.6 and less than 1.7. The fifth lens may have a predetermined Abbe number. For example, the Abbe number of the fifth lens may be greater than 18 and less than 24.

[0102] The sixth lens may have a refractive power. For example, the sixth lens may have a positive refractive power or a negative refractive power. One surface of the sixth lens may be convex. For example, the object side surface of the sixth lens may be convex. The sixth lens may have an aspheric surface. For example, the object side surface or the image side surface of the sixth lens may be aspheric. The sixth lens may include an inflection point. For example, the inflection point may be formed on at least one of the object side surface and the image side surface of the sixth lens. The sixth lens may be formed of a material having a high light transmittance and excellent processability. For example, the sixth lens may be formed of plastic. However, the material of the sixth lens is not limited to plastic. The sixth lens may have a predetermined refractive index. For example, the refractive index of the sixth lens may be greater than 1.5 and less than 1.6. The sixth lens may have a predetermined Abbe number. For example, the Abbe number of the sixth lens may be greater than 50 and less than 60.

[0103] The aspherical surfaces of the first to sixth lenses may be expressed by the following Equation 1:

[0104] Equation 1

[0105]

[0106] Here, c is the inverse of the radius of curvature of the lens, k is the cone constant, r is the distance from a specific point on the aspheric surface of the lens to the optical axis, A to H, J, and L to P are aspheric constants, and Z (or SAG) is the distance between a specific point at a distance r on the aspheric surface of the lens and a tangent plane intersecting the vertex of the aspheric surface of the lens.

[0107] The optical imaging system may further include a cover glass. As an example, the optical imaging system may include a cover glass disposed on the object side or the image side of the variable focal length lens. The optical imaging system may further include an optical filter. The optical filter may be disposed between the sixth lens and the imaging plane. The optical filter may be configured to block light of a specific wavelength. For example, the optical filter may be configured to block infrared rays. The optical imaging system may include an imaging plane. The imaging plane may be formed on a surface of the image sensor or inside the image sensor.

[0108] Next, an optical imaging system according to an exemplary embodiment is described with reference to the drawings.

[0109] Reference below Figure 1 An optical imaging system according to a first exemplary embodiment is described.

[0110] The optical imaging system 100 according to the first exemplary embodiment may include a plurality of lenses. For example, the optical imaging system 100 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 .

[0111] The optical imaging system 100 may include a variable focal length lens. For example, one of the first to sixth lenses 110 to 160 may be a variable focal length lens.

[0112] The first lens 110 may have a positive refractive power, and its object side surface may be convex, while its image side surface may be convex. The second lens 120 may have a negative refractive power, and its object side surface may be convex, while its image side surface may be concave. The third lens 130 may be configured as a variable focal length lens VL. The variable focal length lens VL may include a cover glass CG and a shape-changing portion LQ. The cover glass CG may constantly maintain the shape of the first surface (the object side surface in the present exemplary embodiment) of the variable focal length lens VL, and the shape-changing portion LQ may change the second surface (the image side surface in the present exemplary embodiment) of the variable focal length lens VL to a convex shape or a concave shape. Therefore, according to the shape of the shape-changing portion LQ, the variable focal length lens VL may have a positive refractive power or a negative refractive power. In addition, the shape-changing portion LQ may change the focal length of the variable focal length lens VL by changing the radius of curvature of the variable focal length lens VL. For example, the shape-changing portion LQ may change the focal length of the variable focal length lens VL by increasing or decreasing the radius of curvature of the second surface of the variable focal length lens VL. The fourth lens 140 may have positive refractive power, and its object-side surface may be convex, while its image-side surface may be convex. The fifth lens 150 may have negative refractive power, and its object-side surface may be convex, while its image-side surface may be concave. The fifth lens 150 may have an inflection point. The sixth lens 160 may have negative refractive power, and its object-side surface may be convex, while its image-side surface may be concave. The sixth lens 160 may have an inflection point.

[0113] The optical imaging system 100 may include an imaging plane IP. In the present exemplary embodiment, the imaging plane IP may be formed on a surface of the image sensor IS. The optical imaging system 100 may include a stop ST. For example, the stop ST may be disposed on the object side of the first lens 110. The optical imaging system 100 may include an optical filter IF. The optical filter IF may be disposed between the sixth lens 160 and the imaging plane IP.

[0114] Tables 1 and 2 respectively show the lens characteristics and aspheric coefficients of the optical imaging system according to the present exemplary embodiment, and Figure 2 A graph having curves representing aberration characteristics of the optical imaging system according to the present exemplary embodiment is presented.

[0115] Table 1

[0116]

[0117]

[0118] Table 2

[0119] Face number S1 S2 S3 S4 S9 k -4.4324E-01 9.9000E+01 -9.9000E+01 9.0145E+00 9.9000E+01 A -3.6340E-02 -2.4231E-01 -2.0389E-01 -1.0594E-01 2.5905E-02 B -1.4126E+00 -1.5267E+00 1.4421E+00 3.5022E+00 -2.7251E-01 C 6.9935E+01 3.9611E+01 -4.0407E+01 -5.4949E+01 1.2755E+00 D -1.4017E+03 -4.7144E+02 7.9271E+02 5.6219E+02 -6.8610E+00 E 1.6495E+04 3.7130E+03 -9.2009E+03 -3.9369E+03 2.9589E+01 F -1.2738E+05 -2.1234E+04 6.8777E+04 1.9602E+04 -8.3432E+01 G 6.7928E+05 9.2300E+04 -3.4939E+05 -7.1001E+04 1.5115E+02 H -2.5647E+06 -3.0987E+05 1.2418E+06 1.8911E+05 -1.7625E+02 J 6.9138E+06 7.9614E+05 -3.1243E+06 -3.7023E+05 1.2680E+02 L -1.3227E+07 -1.5225E+06 5.5435E+06 5.2632E+05 -4.5987E+01 M 1.7541E+07 2.0759E+06 -6.7880E+06 -5.2830E+05 -3.2030E+00 N -1.5333E+07 -1.8913E+06 5.4614E+06 3.5472E+05 1.0797E+01 O 7.9447E+06 1.0258E+06 -2.5991E+06 -1.4285E+05 -4.2367E+00 P -1.8482E+06 -2.4950E+05 5.5459E+05 2.6070E+04 5.7960E-01 Face number S10 S11 S12 S13 S14 k -5.3006E+01 6.0508E+01 -7.0390E+00 -2.5565E+00 -9.6103E-01 A 2.2552E-01 3.1755E-01 -2.8524E-01 -7.2886E-01 -8.3591E-01 B 4.4258E-01 2.5092E-01 1.6724E+00 1.2687E+00 1.1088E+00 C -6.5908E+00 -3.2956E+00 -4.0000E+00 -1.5483E+00 -1.2029E+00 D 2.5873E+01 9.3938E+00 5.6633E+00 1.2315E+00 9.6210E-01 E -6.2403E+01 -1.6550E+01 -5.4012E+00 -6.3044E-01 -5.6639E-01 F 1.0713E+02 2.0630E+01 3.6597E+00 1.8061E-01 2.4756E-01 G -1.3745E+02 -1.8886E+01 -1.8090E+00 -4.0425E-03 -8.1046E-02 H 1.3318E+02 1.2781E+01 6.5995E-01 -1.9833E-02 1.9932E-02 J -9.6641E+01 -6.3480E+00 -1.7773E-01 8.9985E-03 -3.6606E-03 L 5.1435E+01 2.2732E+00 3.4917E-02 -2.1660E-03 4.9365E-04 M -1.9398E+01 -5.6880E-01 -4.8674E-03 3.2396E-04 -4.7364E-05 N 4.8912E+00 9.4089E-02 4.5613E-04 -3.0211E-05 3.0559E-06 O -7.3779E-01 -9.2266E-03 -2.5759E-05 1.6168E-06 -1.1871E-07 P 5.0255E-02 4.0566E-04 6.6213E-07 -3.8058E-08 2.0961E-09

[0120] Reference Figure 3 An optical imaging system according to a second exemplary embodiment is described.

[0121] The optical imaging system 200 according to the second exemplary embodiment may include a plurality of lenses. For example, the optical imaging system 200 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 .

[0122] The optical imaging system 200 may include a variable focal length lens. For example, one of the first to sixth lenses 210 to 260 may be a variable focal length lens.

[0123] The first lens 210 may have a positive refractive power, and its object side surface may be convex, while its image side surface may be convex. The second lens 220 may have a negative refractive power, and its object side surface may be convex, while its image side surface may be concave. The third lens 230 may be configured as a variable focal length lens VL. The variable focal length lens VL may include a cover glass CG and a shape-changing portion LQ. The cover glass CG may constantly maintain the shape of the first surface (the object side surface in the present exemplary embodiment) of the variable focal length lens VL, and the shape-changing portion LQ may change the second surface (the image side surface in the present exemplary embodiment) of the variable focal length lens VL to a convex shape or a concave shape. Therefore, according to the shape of the shape-changing portion LQ, the variable focal length lens VL may have a positive refractive power or a negative refractive power. In addition, the shape-changing portion LQ may change the focal length of the variable focal length lens VL by changing the radius of curvature of the variable focal length lens VL. For example, the shape-changing portion LQ may change the focal length of the variable focal length lens VL by increasing or decreasing the radius of curvature of the second surface of the variable focal length lens VL. The fourth lens 240 may have positive refractive power, and its object side surface may be convex, while its image side surface may be convex. The fifth lens 250 may have negative refractive power, and its object side surface may be convex, while its image side surface may be concave. The fifth lens 250 may have an inflection point. The sixth lens 260 may have positive refractive power, and its object side surface may be convex, while its image side surface may be concave. The sixth lens 260 may have an inflection point.

[0124] The optical imaging system 200 may include an imaging plane IP. In the present exemplary embodiment, the imaging plane IP may be formed on a surface of the image sensor IS. The optical imaging system 200 may include a stop ST. For example, the stop ST may be disposed on the object side of the first lens 210. The optical imaging system 200 may include a filter IF. The filter IF may be disposed between the sixth lens 260 and the imaging plane IP.

[0125] Tables 3 and 4 respectively show the lens characteristics and aspheric coefficients of the optical imaging system according to the present exemplary embodiment, and Figure 4 A graph having curves representing aberration characteristics of the optical imaging system according to the present exemplary embodiment is presented.

[0126] Table 3

[0127]

[0128]

[0129] Table 4

[0130]

[0131]

[0132] Reference Figure 5 An optical imaging system according to a third exemplary embodiment is described.

[0133] The optical imaging system 300 according to the third exemplary embodiment may include a plurality of lenses. For example, the optical imaging system 300 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 .

[0134] The optical imaging system 300 may include a variable focal length lens. For example, one of the first lens 310 to the sixth lens 360 may be a variable focal length lens.

[0135] The first lens 310 may have a positive refractive power, and its object side surface may be convex, while its image side surface may be convex. The second lens 320 may have a negative refractive power, and its object side surface may be convex, while its image side surface may be concave. The third lens 330 may be configured as a variable focal length lens VL. The variable focal length lens VL may include a cover glass CG and a shape-changing portion LQ. The cover glass CG may constantly maintain the shape of the first surface (the object side surface in the present exemplary embodiment) of the variable focal length lens VL, and the shape-changing portion LQ may change the second surface (the image side surface in the present exemplary embodiment) of the variable focal length lens VL to a convex shape or a concave shape. Therefore, according to the shape of the shape-changing portion LQ, the variable focal length lens VL may have a positive refractive power or a negative refractive power. In addition, the shape-changing portion LQ may change the focal length of the variable focal length lens VL by changing the radius of curvature of the variable focal length lens VL. For example, the shape-changing portion LQ may change the focal length of the variable focal length lens VL by increasing or decreasing the radius of curvature of the second surface of the variable focal length lens VL. The fourth lens 340 may have positive refractive power, and its object side surface may be convex, while its image side surface may be convex. The fifth lens 350 may have negative refractive power, and its object side surface may be convex, while its image side surface may be concave. The fifth lens 350 may have an inflection point. The sixth lens 360 may have positive refractive power, and its object side surface may be convex, while its image side surface may be concave. The sixth lens 360 may have an inflection point.

[0136] The optical imaging system 300 may include an imaging plane IP. In the present exemplary embodiment, the imaging plane IP may be formed on a surface of the image sensor IS. The optical imaging system 300 may include a stop ST. For example, the stop ST may be disposed on the object side of the first lens 310. The optical imaging system 300 may include a filter IF. The filter IF may be disposed between the sixth lens 360 and the imaging plane IP.

[0137] Tables 5 and 6 respectively show the lens characteristics and aspheric coefficients of the optical imaging system according to the present exemplary embodiment, and Figure 6 A graph having curves representing aberration characteristics of the optical imaging system according to the present exemplary embodiment is presented.

[0138] Table 5

[0139] Face number part Radius of curvature Thickness / distance Refractive Index Abbe number Effective radius S1 First lens 1.7437 0.8000 1.543 56.0 0.725 S2 -102.4008 0.0238 0.772 S3 Second lens 10.2829 0.2300 1.667 19.2 0.798 S4 3.7195 0.2217 0.836 S5 The third lens infinity 0.1000 1.516 64.2 1.100 S6 infinity 0.2800 1.548 30.0 1.100 S7 infinity 0.0200 1.529 65.4 1.100 S8 infinity 0.2000 1.100 S9 The fourth lens 59.4471 0.3688 1.534 55.7 1.260 S10 -9.2225 0.1400 1.432 S11 Fifth lens 14.3214 0.4500 1.647 21.5 1.760 S12 4.3088 0.2674 2.180 S13 The sixth lens 0.9944 0.5333 1.534 55.7 2.460 S14 0.8118 0.5286 2.780 S15 Optical Filters infinity 0.2100 S16 infinity 0.2040 S17 Imaging surface -0.0176

[0140] Table 6

[0141]

[0142]

[0143] Reference Figure 7 An optical imaging system according to a fourth exemplary embodiment is described.

[0144] The optical imaging system 400 according to the fourth exemplary embodiment may include a plurality of lenses. For example, the optical imaging system 400 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 .

[0145] The optical imaging system 400 may include a variable focal length lens. For example, one of the first to sixth lenses 410 to 460 may be a variable focal length lens.

[0146] The first lens 410 may have a positive refractive power, and its object side surface may be convex, while its image side surface may be concave. The second lens 420 may have a negative refractive power, and its object side surface may be convex, while its image side surface may be concave. The third lens 430 may be configured as a variable focal length lens VL. The variable focal length lens VL may include a cover glass CG and a shape-changing portion LQ. The cover glass CG may constantly maintain the shape of the first surface (the object side surface in the present exemplary embodiment) of the variable focal length lens VL, and the shape-changing portion LQ may change the second surface (the image side surface in the present exemplary embodiment) of the variable focal length lens VL to a convex shape or a concave shape. Therefore, according to the shape of the shape-changing portion LQ, the variable focal length lens VL may have a positive refractive power or a negative refractive power. In addition, the shape-changing portion LQ may change the focal length of the variable focal length lens VL by changing the radius of curvature of the variable focal length lens VL. For example, the shape-changing portion LQ may change the focal length of the variable focal length lens VL by increasing or decreasing the radius of curvature of the second surface of the variable focal length lens VL. The fourth lens 440 may have positive refractive power, and its object side surface may be convex, while its image side surface may be convex. The fifth lens 450 may have negative refractive power, and its object side surface may be convex, while its image side surface may be concave. The fifth lens 450 may have an inflection point. The sixth lens 460 may have positive refractive power, and its object side surface may be convex, while its image side surface may be concave. The sixth lens 460 may have an inflection point.

[0147] The optical imaging system 400 may include an imaging plane IP. In the present exemplary embodiment, the imaging plane IP may be formed on a surface of the image sensor IS. The optical imaging system 400 may include a stop ST. For example, the stop ST may be disposed on the object side of the first lens 410. The optical imaging system 400 may include a filter IF. The filter IF may be disposed between the sixth lens 460 and the imaging plane IP.

[0148] Tables 7 and 8 respectively show the lens characteristics and aspheric coefficients of the optical imaging system according to the present exemplary embodiment, and Figure 8 A graph having curves representing aberration characteristics of the optical imaging system according to the present exemplary embodiment is presented.

[0149] Table 7

[0150] Face number part Radius of curvature Thickness / distance Refractive Index Abbe number Effective radius S1 First lens 1.7466 0.8150 1.543 56.0 0.725 S2 61.5649 0.0238 0.772 S3 Second lens 8.1279 0.2300 1.667 19.2 0.800 S4 3.6934 0.2263 0.837 S5 The third lens infinity 0.1000 1.516 64.2 1.100 S6 infinity 0.2800 1.548 30.0 1.100 S7 infinity 0.0200 1.529 65.4 1.100 S8 infinity 0.2000 1.100 S9 The fourth lens 66.8001 0.3687 1.534 55.7 1.260 S10 -9.1120 0.1400 1.432 S11 Fifth lens 14.6828 0.4500 1.647 21.5 1.760 S12 4.3259 0.2560 2.180 S13 The sixth lens 0.9923 0.5252 1.534 55.7 2.460 S14 0.8100 0.5285 2.780 S15 Optical Filters infinity 0.2100 S16 infinity 0.2024 S17 Imaging surface -0.0159

[0151] Table 8

[0152]

[0153]

[0154] Will refer to Fig. 9 An optical imaging system according to a fifth exemplary embodiment is described.

[0155] The optical imaging system 500 according to the fifth exemplary embodiment may include a plurality of lenses. For example, the optical imaging system 500 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 .

[0156] The optical imaging system 500 may include a variable focal length lens. For example, one of the first lens 510 to the sixth lens 560 may be a variable focal length lens.

[0157] The first lens 510 may have a positive refractive power, and its object side surface may be convex, while its image side surface may be concave. The second lens 520 may have a negative refractive power, and its object side surface may be convex, while its image side surface may be concave. The third lens 530 may be configured as a variable focal length lens VL. The variable focal length lens VL may include a cover glass CG and a shape-changing portion LQ. The cover glass CG may constantly maintain the shape of the first surface (the object side surface in the present exemplary embodiment) of the variable focal length lens VL, and the shape-changing portion LQ may change the second surface (the image side surface in the present exemplary embodiment) of the variable focal length lens VL to a convex shape or a concave shape. Therefore, according to the shape of the shape-changing portion LQ, the variable focal length lens VL may have a positive refractive power or a negative refractive power. In addition, the shape-changing portion LQ may change the focal length of the variable focal length lens VL by changing the radius of curvature of the variable focal length lens VL. For example, the shape-changing portion LQ may change the focal length of the variable focal length lens VL by increasing or decreasing the radius of curvature of the second surface of the variable focal length lens VL. The fourth lens 540 may have positive refractive power, and its object side surface may be convex, while its image side surface may be convex. The fifth lens 550 may have negative refractive power, and its object side surface may be convex, while its image side surface may be concave. The fifth lens 550 may have an inflection point. The sixth lens 560 may have positive refractive power, and its object side surface may be convex, while its image side surface may be concave. The sixth lens 560 may have an inflection point.

[0158] The optical imaging system 500 may include an imaging plane IP. In the present exemplary embodiment, the imaging plane IP may be formed on a surface of the image sensor IS. The optical imaging system 500 may include a stop ST. For example, the stop ST may be disposed on the object side of the first lens 510. The optical imaging system 500 may include a filter IF. The filter IF may be disposed between the sixth lens 560 and the imaging plane IP.

[0159] Tables 9 and 10 respectively show the lens characteristics and aspheric coefficients of the optical imaging system according to the present exemplary embodiment, and Fig.10 A graph having curves representing aberration characteristics of the optical imaging system according to the present exemplary embodiment is presented.

[0160] Table 9

[0161]

[0162]

[0163] Table 10

[0164] Face number S1 S2 S3 S4 S9 k -4.2279E-01 -9.9000E+01 -7.0102E+01 9.0907E+00 9.9000E+01 A -3.0686E-02 -2.4155E-01 -1.6929E-01 -1.0360E-01 7.0233E-03 B -1.7409E+00 -1.9268E+00 5.3730E-01 3.5492E+00 5.6768E-02 C 7.9169E+01 4.8169E+01 -2.2277E+01 -5.5853E+01 -1.2913E+00 D -1.5540E+03 -6.5208E+02 5.0738E+02 5.6445E+02 6.5214E+00 E 1.8138E+04 6.1662E+03 -6.1098E+03 -3.8617E+03 -2.0150E+01 F -1.3967E+05 -4.2207E+04 4.6046E+04 1.8565E+04 5.1557E+01 G 7.4487E+05 2.1086E+05 -2.3371E+05 -6.4077E+04 -1.1811E+02 H -2.8181E+06 -7.6893E+05 8.2745E+05 1.6025E+05 2.1766E+02 J 7.6242E+06 2.0350E+06 -2.0719E+06 -2.8993E+05 -2.9244E+02 L -1.4655E+07 -3.8533E+06 3.6585E+06 3.7431E+05 2.7342E+02 M 1.9547E+07 5.0762E+06 -4.4592E+06 -3.3462E+05 -1.7235E+02 N -1.7200E+07 -4.4123E+06 3.5723E+06 1.9558E+05 6.9776E+01 O 8.9786E+06 2.2725E+06 -1.6933E+06 -6.6640E+04 -1.6385E+01 P -2.1058E+06 -5.2491E+05 3.5995E+05 9.9010E+03 1.6971E+00 Face number S10 S11 S12 S13 S14 k -8.5573E+01 6.1117E+01 -8.3877E+00 -2.5894E+00 -9.6203E-01 A 1.8934E-01 2.9297E-01 -3.1946E-01 -7.5341E-01 -8.4420E-01 B 7.2600E-01 4.3549E-01 1.8612E+00 1.4187E+00 1.1546E+00 C -7.5919E+00 -3.9280E+00 -4.5279E+00 -1.9393E+00 -1.3056E+00 D 2.7534E+01 1.0628E+01 6.5468E+00 1.8455E+00 1.0850E+00 E -6.2310E+01 -1.8069E+01 -6.3676E+00 -1.2521E+00 -6.5500E-01 F 1.0093E+02 2.1890E+01 4.3890E+00 6.0524E-01 2.8894E-01 G -1.2344E+02 -1.9626E+01 -2.2011E+00 -2.0615E-01 -9.4091E-02 H 1.1557E+02 1.3100E+01 8.1254E-01 4.8525E-02 2.2758E-02 J -8.2037E+01 -6.4496E+00 -2.2083E-01 -7.5491E-03 -4.0804E-03 L 4.3098E+01 2.2958E+00 4.3654E-02 6.8385E-04 5.3526E-04 M -1.6127E+01 -5.7144E-01 -6.1033E-03 -1.7307E-05 -4.9924E-05 N 4.0437E+00 9.3954E-02 5.7147E-04 -3.1812E-06 3.1355E-06 O -6.0674E-01 -9.1385E-03 -3.2106E-05 3.4287E-07 -1.1887E-07 P 4.1074E-02 3.9724E-04 8.1671E-07 -1.0994E-08 2.0550E-09

[0165] Reference Fig.11 An optical imaging system according to a sixth exemplary embodiment is described.

[0166] The optical imaging system 600 according to the sixth exemplary embodiment may include a plurality of lenses. For example, the optical imaging system 600 may include a first lens 610 , a second lens 620 , a third lens 630 , a fourth lens 640 , a fifth lens 650 , and a sixth lens 660 .

[0167] The optical imaging system 600 may include a variable focal length lens. For example, one of the first lens 610 to the sixth lens 660 may be a variable focal length lens.

[0168] The first lens 610 may have a positive refractive power, and its object side surface may be convex, while its image side surface may be convex. The second lens 620 may have a negative refractive power, and its object side surface may be convex, while its image side surface may be concave. The third lens 630 may be configured as a variable focal length lens VL. The variable focal length lens VL may include a cover glass CG and a shape-changing portion LQ. The cover glass CG may constantly maintain the shape of the first surface (the object side surface in this exemplary embodiment) of the variable focal length lens VL, and the shape-changing portion LQ may change the second surface (the image side surface in this exemplary embodiment) of the variable focal length lens VL to a convex shape or a concave shape. Therefore, according to the shape of the shape-changing portion LQ, the variable focal length lens VL may have a positive refractive power or a negative refractive power. In addition, the shape-changing portion LQ may change the focal length of the variable focal length lens VL by changing the radius of curvature of the variable focal length lens VL. For example, the shape-changing portion LQ may change the focal length of the variable focal length lens VL by increasing or decreasing the radius of curvature of the second surface of the variable focal length lens VL. The fourth lens 640 may have positive refractive power, and its object side surface may be convex, while its image side surface may be convex. The fifth lens 650 may have negative refractive power, and its object side surface may be convex, while its image side surface may be concave. The fifth lens 650 may have an inflection point. The sixth lens 660 may have positive refractive power, and its object side surface may be convex, while its image side surface may be concave. The sixth lens 660 may have an inflection point.

[0169] The optical imaging system 600 may include an imaging plane IP. In the present exemplary embodiment, the imaging plane IP may be formed on a surface of the image sensor IS. The optical imaging system 600 may include a stop ST. For example, the stop ST may be disposed on the object side of the first lens 610. The optical imaging system 600 may include a filter IF. The filter IF may be disposed between the sixth lens 660 and the imaging plane IP.

[0170] Tables 11 and 12 respectively show the lens characteristics and aspheric coefficients of the optical imaging system according to the present exemplary embodiment, and Fig.12 A graph having curves representing aberration characteristics of the optical imaging system according to the present exemplary embodiment is presented.

[0171] Table 11

[0172] Face number part Radius of curvature Thickness / distance Refractive Index Abbe number Effective radius S1 First lens 1.7669 0.8000 1.543 56.0 0.725 S2 -72.0404 0.0238 0.772 S3 Second lens 10.6926 0.2300 1.657 20.4 0.800 S4 3.8053 0.2224 0.845 S5 The third lens infinity 0.1000 1.516 64.2 1.100 S6 infinity 0.2800 1.548 30.0 1.100 S7 infinity 0.0200 1.529 65.4 1.100 S8 infinity 0.2000 1.100 S9 The fourth lens 57.0419 0.4169 1.534 55.7 1.198 S10 -9.2670 0.1413 1.432 S11 Fifth lens 14.1090 0.4500 1.647 21.5 1.726 S12 4.1534 0.2858 2.150 S13 The sixth lens 1.0041 0.5499 1.534 55.7 2.416 S14 0.8212 0.4950 2.738 S15 Optical Filters infinity 0.2100 S16 infinity 0.2000 S17 Imaging surface 0.0200

[0173] Table 12

[0174]

[0175]

[0176] Reference Fig.13 An optical imaging system according to a seventh exemplary embodiment is described.

[0177] The optical imaging system 700 according to the seventh exemplary embodiment may include a plurality of lenses. For example, the optical imaging system 700 may include a first lens 710 , a second lens 720 , a third lens 730 , a fourth lens 740 , a fifth lens 750 , and a sixth lens 760 .

[0178] The optical imaging system 700 may include a variable focal length lens. For example, one of the first lens 710 to the sixth lens 760 may be a variable focal length lens.

[0179] The first lens 710 may have a positive refractive power, and its object side surface may be convex, while its image side surface may be convex. The second lens 720 may have a negative refractive power, and its object side surface may be convex, while its image side surface may be concave. The third lens 730 may be configured as a variable focal length lens VL. The variable focal length lens VL may include a cover glass CG and a shape-changing portion LQ. The cover glass CG may constantly maintain the shape of the first surface (the object side surface in this exemplary embodiment) of the variable focal length lens VL, and the shape-changing portion LQ may change the second surface (the image side surface in this exemplary embodiment) of the variable focal length lens VL to a convex shape or a concave shape. Therefore, according to the shape of the shape-changing portion LQ, the variable focal length lens VL may have a positive refractive power or a negative refractive power. In addition, the shape-changing portion LQ may change the focal length of the variable focal length lens VL by changing the radius of curvature of the variable focal length lens VL. For example, the shape-changing portion LQ may change the focal length of the variable focal length lens VL by increasing or decreasing the radius of curvature of the second surface of the variable focal length lens VL. The fourth lens 740 may have positive refractive power, and its object side surface may be convex, while its image side surface may be convex. The fifth lens 750 may have negative refractive power, and its object side surface may be convex, while its image side surface may be concave. The fifth lens 750 may have an inflection point. The sixth lens 760 may have negative refractive power, and its object side surface may be convex, while its image side surface may be concave. The sixth lens 760 may have an inflection point.

[0180] The optical imaging system 700 may include an imaging plane IP. In the present exemplary embodiment, the imaging plane IP may be formed on a surface of the image sensor IS. The optical imaging system 700 may include a stop ST. For example, the stop ST may be disposed on the object side of the first lens 710. The optical imaging system 700 may include an optical filter IF. The optical filter IF may be disposed between the sixth lens 760 and the imaging plane IP.

[0181] Tables 13 and 14 respectively show the lens characteristics and aspheric coefficients of the optical imaging system according to the present exemplary embodiment, and Fig.14 A graph having curves representing aberration characteristics of the optical imaging system according to the present exemplary embodiment is presented.

[0182] Table 13

[0183] Face number part Radius of curvature Thickness / distance Refractive Index Abbe number Effective radius S1 First lens 1.7526 0.8000 1.543 56.0 0.725 S2 -46.3907 0.0238 0.772 S3 Second lens 11.6472 0.2300 1.657 20.4 0.798 S4 3.7555 0.2227 0.838 S5 The third lens infinity 0.1000 1.516 64.2 1.100 S6 infinity 0.2800 1.548 30.0 1.100 S7 infinity 0.0200 1.529 65.4 1.100 S8 infinity 0.2000 1.100 S9 The fourth lens 57.3964 0.3884 1.534 55.7 1.260 S10 -9.2470 0.1422 1.432 S11 Fifth lens 14.1780 0.4500 1.647 21.5 1.760 S12 4.3684 0.2809 2.180 S13 The sixth lens 1.0053 0.5370 1.534 55.7 2.460 S14 0.8126 0.5103 2.780 S15 Optical Filters infinity 0.2100 S16 infinity 0.2000 S17 Imaging surface 0.0047

[0184] Table 14

[0185]

[0186]

[0187] Will refer to Fig.15 An optical imaging system according to an eighth exemplary embodiment is described.

[0188] The optical imaging system 800 according to the eighth exemplary embodiment may include a plurality of lenses. For example, the optical imaging system 800 may include a first lens 810 , a second lens 820 , a third lens 830 , a fourth lens 840 , a fifth lens 850 , and a sixth lens 860 .

[0189] The optical imaging system 800 may include a variable focal length lens. For example, one of the first lens 810 to the sixth lens 860 may be a variable focal length lens.

[0190] The first lens 810 may have a positive refractive power, and its object side surface may be convex, while its image side surface may be convex. The second lens 820 may have a negative refractive power, and its object side surface may be convex, while its image side surface may be concave. The third lens 830 may be configured as a variable focal length lens VL. The variable focal length lens VL may include a cover glass CG and a shape-changing portion LQ. The cover glass CG may constantly maintain the shape of the first surface (the object side surface in this exemplary embodiment) of the variable focal length lens VL, and the shape-changing portion LQ may change the second surface (the image side surface in this exemplary embodiment) of the variable focal length lens VL to a convex shape or a concave shape. Therefore, according to the shape of the shape-changing portion LQ, the variable focal length lens VL may have a positive refractive power or a negative refractive power. In addition, the shape-changing portion LQ may change the focal length of the variable focal length lens VL by changing the radius of curvature of the variable focal length lens VL. For example, the shape-changing portion LQ may change the focal length of the variable focal length lens VL by increasing or decreasing the radius of curvature of the second surface of the variable focal length lens VL. The fourth lens 840 may have positive refractive power, and its object side surface may be convex, while its image side surface may be convex. The fifth lens 850 may have negative refractive power, and its object side surface may be convex, while its image side surface may be concave. The fifth lens 850 may have an inflection point. The sixth lens 860 may have positive refractive power, and its object side surface may be convex, while its image side surface may be concave. The sixth lens 860 may have an inflection point.

[0191] The optical imaging system 800 may include an imaging plane IP. In the present exemplary embodiment, the imaging plane IP may be formed on a surface of the image sensor IS. The optical imaging system 800 may include a stop ST. For example, the stop ST may be disposed on the object side of the first lens 810. The optical imaging system 800 may include an optical filter IF. The optical filter IF may be disposed between the sixth lens 860 and the imaging plane IP.

[0192] Table 15 and Table 16 respectively show the lens characteristics and aspheric coefficients of the optical imaging system according to the present exemplary embodiment, and Fig.16 A graph having curves representing aberration characteristics of the optical imaging system according to the present exemplary embodiment is presented.

[0193] Table 15

[0194]

[0195]

[0196] Table 16

[0197] Face number S1 S2 S3 S4 S9 k -4.3782E-01 9.9000E+01 -9.9000E+01 9.1955E+00 9.9000E+01 A -1.9657E-02 -2.3076E-01 -1.7874E-01 -1.1543E-01 3.0322E-02 B -2.3463E+00 -2.5501E+00 5.7308E-01 3.8999E+00 -3.0846E-01 C 9.4107E+01 6.2305E+01 -2.4623E+01 -6.1802E+01 2.1044E+00 D -1.7621E+03 -8.1317E+02 5.8823E+02 6.3162E+02 -1.3280E+01 E 1.9934E+04 7.2304E+03 -7.3171E+03 -4.3844E+03 5.6951E+01 F -1.4964E+05 -4.6230E+04 5.6487E+04 2.1488E+04 -1.5810E+02 G 7.8029E+05 2.1697E+05 -2.9226E+05 -7.6110E+04 2.9094E+02 H -2.8912E+06 -7.5176E+05 1.0515E+06 1.9701E+05 -3.6249E+02 J 7.6686E+06 1.9136E+06 -2.6696E+06 -3.7283E+05 3.0639E+02 L -1.4462E+07 -3.5235E+06 4.7719E+06 5.0990E+05 -1.7145E+02 M 1.8933E+07 4.5542E+06 -5.8807E+06 -4.9045E+05 5.9173E+01 N -1.6357E+07 -3.9106E+06 4.7588E+06 3.1450E+05 -1.0263E+01 O 8.3845E+06 1.9998E+06 -2.2768E+06 -1.2061E+05 1.1137E-01 P -1.9311E+06 -4.6024E+05 4.8822E+05 2.0908E+04 1.6443E-01 Face number S10 S11 S12 S13 S14 k -9.6433E+01 6.0358E+01 -8.0517E+00 -2.5763E+00 -9.6132E-01 A 1.9732E-01 2.9341E-01 -3.1146E-01 -7.4702E-01 -8.3995E-01 B 6.7725E-01 4.8772E-01 1.8438E+00 1.3979E+00 1.1334E+00 C -7.1254E+00 -4.2429E+00 -4.5184E+00 -1.8939E+00 -1.2618E+00 D 2.4931E+01 1.1617E+01 6.5693E+00 1.7700E+00 1.0308E+00 E -5.3766E+01 -2.0113E+01 -6.4281E+00 -1.1669E+00 -6.1158E-01 F 8.2624E+01 2.4853E+01 4.4649E+00 5.4126E-01 2.6520E-01 G -9.6281E+01 -2.2710E+01 -2.2617E+00 -1.7349E-01 -8.4911E-02 H 8.6879E+01 1.5430E+01 8.4570E-01 3.6912E-02 2.0198E-02 J -6.0273E+01 -7.7282E+00 -2.3353E-01 -4.6384E-03 -3.5626E-03 L 3.1312E+01 2.7992E+00 4.7066E-02 1.7054E-04 4.6000E-04 M -1.1681E+01 -7.0998E-01 -6.7326E-03 4.5119E-05 -4.2270E-05 N 2.9332E+00 1.1921E-01 6.4750E-04 -8.1709E-06 2.6189E-06 O -4.4173E-01 -1.1878E-02 -3.7528E-05 5.7897E-07 -9.8122E-08 P 3.0034E-02 5.3091E-04 9.8987E-07 -1.6007E-08 1.6801E-09

[0198] Will refer to Fig.17 An optical imaging system according to a ninth exemplary embodiment is described.

[0199] The optical imaging system 900 according to the ninth exemplary embodiment may include a plurality of lenses. For example, the optical imaging system 900 may include a first lens 910 , a second lens 920 , a third lens 930 , a fourth lens 940 , a fifth lens 950 , and a sixth lens 960 .

[0200] The optical imaging system 900 may include a variable focal length lens. For example, one of the first lens 910 to the sixth lens 960 may be a variable focal length lens.

[0201] The first lens 910 may have a positive refractive power, and its object side surface may be convex, while its image side surface may be concave. The second lens 920 may have a negative refractive power, and its object side surface may be convex, while its image side surface may be concave. The third lens 930 may be configured as a variable focal length lens VL. The variable focal length lens VL may include a cover glass CG and a shape-changing portion LQ. The cover glass CG may constantly maintain the shape of the first surface (the object side surface in this exemplary embodiment) of the variable focal length lens VL, and the shape-changing portion LQ may change the second surface (the image side surface in this exemplary embodiment) of the variable focal length lens VL to a convex shape or a concave shape. Therefore, according to the shape of the shape-changing portion LQ, the variable focal length lens VL may have a positive refractive power or a negative refractive power. In addition, the shape-changing portion LQ may change the focal length of the variable focal length lens VL by changing the radius of curvature of the variable focal length lens VL. For example, the shape-changing portion LQ may change the focal length of the variable focal length lens VL by increasing or decreasing the radius of curvature of the second surface of the variable focal length lens VL. The fourth lens 940 may have positive refractive power, and its object side surface may be convex, while its image side surface may be convex. The fifth lens 950 may have negative refractive power, and its object side surface may be convex, while its image side surface may be concave. The fifth lens 950 may have an inflection point. The sixth lens 960 may have positive refractive power, and its object side surface may be convex, while its image side surface may be concave. The sixth lens 960 may have an inflection point.

[0202] The optical imaging system 900 may include an imaging plane IP. In the present exemplary embodiment, the imaging plane IP may be formed on a surface of the image sensor IS. The optical imaging system 900 may include a stop ST. For example, the stop ST may be disposed on the object side of the first lens 910. The optical imaging system 900 may include an optical filter IF. The optical filter IF may be disposed between the sixth lens 960 and the imaging plane IP.

[0203] Tables 17 and 18 respectively show the lens characteristics and aspheric coefficients of the optical imaging system according to the present exemplary embodiment, and Fig.18 A graph having curves representing aberration characteristics of the optical imaging system according to the present exemplary embodiment is presented.

[0204] Table 17

[0205] Face number part Radius of curvature Thickness / distance Refractive Index Abbe number Effective radius S1 First lens 1.7146 0.8000 1.543 56.0 0.725 S2 895.3855 0.0238 0.772 S3 Second lens 9.3151 0.2300 1.657 20.4 0.797 S4 3.6048 0.2294 0.834 S5 The third lens infinity 0.1000 1.516 64.2 1.100 S6 infinity 0.2800 1.548 30.0 1.100 S7 infinity 0.0200 1.529 65.4 1.100 S8 infinity 0.2000 1.100 S9 The fourth lens 57.2654 0.3636 1.534 55.7 1.204 S10 -9.2625 0.1400 1.432 S11 Fifth lens 14.3082 0.4374 1.647 21.5 1.722 S12 4.1496 0.2575 2.142 S13 The sixth lens 0.9826 0.5133 1.534 55.7 2.411 S14 0.8094 0.5288 2.727 S15 Optical Filters infinity 0.2100 S16 infinity 0.2062 S17 Imaging surface -0.0200

[0206] Table 18

[0207]

[0208]

[0209] Reference Fig.19 An optical imaging system according to a tenth exemplary embodiment is described.

[0210] The optical imaging system 1000 according to the tenth exemplary embodiment may include a plurality of lenses. For example, the optical imaging system 1000 may include a first lens 1010 , a second lens 1020 , a third lens 1030 , a fourth lens 1040 , a fifth lens 1050 , and a sixth lens 1060 .

[0211] The optical imaging system 1000 may include a variable focal length lens. For example, one of the first lens 1010 to the sixth lens 1060 may be a variable focal length lens.

[0212] The first lens 1010 may have a positive refractive power, and its object side surface may be convex, while its image side surface may be concave. The second lens 1020 may have a negative refractive power, and its object side surface may be convex, while its image side surface may be concave. The third lens 1030 may be configured as a variable focal length lens VL. The variable focal length lens VL may include a cover glass CG and a shape changing portion LQ. The cover glass CG may constantly maintain the shape of the first surface (the object side surface in this exemplary embodiment) of the variable focal length lens VL, and the shape changing portion LQ may change the second surface (the image side surface in this exemplary embodiment) of the variable focal length lens VL to a convex shape or a concave shape. Therefore, depending on the shape of the shape changing portion LQ, the variable focal length lens VL may have a positive refractive power or a negative refractive power. In addition, the shape changing portion LQ may change the focal length of the variable focal length lens VL by changing the radius of curvature of the variable focal length lens VL. For example, the shape changing portion LQ may change the focal length of the variable focal length lens VL by increasing or decreasing the radius of curvature of the second surface of the variable focal length lens VL. The fourth lens 1040 may have positive refractive power, and its object side surface may be convex, while its image side surface may be convex. The fifth lens 1050 may have negative refractive power, and its object side surface may be convex, while its image side surface may be concave. The fifth lens 1050 may have an inflection point. The sixth lens 1060 may have positive refractive power, and its object side surface may be convex, while its image side surface may be concave. The sixth lens 1060 may have an inflection point.

[0213] The optical imaging system 1000 may include an imaging plane IP. In the present exemplary embodiment, the imaging plane IP may be formed on a surface of the image sensor IS. The optical imaging system 1000 may include a stop ST. For example, the stop ST may be disposed on the object side of the first lens 1010. The optical imaging system 1000 may include a filter IF. The filter IF may be disposed between the sixth lens 1060 and the imaging plane IP.

[0214] Tables 19 and 20 respectively show the lens characteristics and aspheric coefficients of the optical imaging system according to the present exemplary embodiment, and Fig. 20 A graph having curves representing aberration characteristics of the optical imaging system according to the present exemplary embodiment is presented.

[0215] Table 19

[0216] Face number part Radius of curvature Thickness / distance Refractive Index Abbe number Effective radius S1 First lens 1.6992 0.8000 1.543 56.0 0.725 S2 119.6704 0.0238 0.772 S3 Second lens 8.7145 0.2300 1.657 20.4 0.797 S4 3.5443 0.2317 0.833 S5 The third lens infinity 0.1000 1.516 64.2 1.100 S6 infinity 0.2800 1.548 30.0 1.100 S7 infinity 0.0200 1.529 65.4 1.100 S8 infinity 0.2000 1.100 S9 The fourth lens 57.1728 0.3594 1.534 55.7 1.204 S10 -9.2674 0.1400 1.432 S11 Fifth lens 14.2907 0.4297 1.647 21.5 1.722 S12 4.1342 0.2551 2.142 S13 The sixth lens 0.9806 0.5053 1.534 55.7 2.411 S14 0.8068 0.5288 2.727 S15 Optical Filters infinity 0.2100 S16 infinity 0.2062 S17 Imaging surface -0.0200

[0217] Table 20

[0218]

[0219]

[0220] Table 21 and Table 22 respectively represent optical characteristic values ​​and values ​​of conditional expressions of the optical imaging systems according to the first to tenth exemplary embodiments.

[0221] Table 21

[0222]

[0223]

[0224] Table 22

[0225]

[0226] Next, we will refer to Fig.21 Describe the structure of a variable focal length lens.

[0227] According to one form, the variable focal length lens VL may be configured to have a predetermined refractive power. For example, the variable focal length lens VL may have a positive refractive power. One surface of the variable focal length lens VL may be convex. For example, Fig.21 As shown, the image side surfaces Sq4 and Sq5 of the variable focal length lens VL may be convex. One surface of the variable focal length lens VL may be flat. For example, Fig.21As shown, the object side surface Sq3 of the variable focal length lens VL may be flat. However, one surface of the variable focal length lens VL is not necessarily flat. The radius of curvature of the convex surface or image side surfaces Sq4 and Sq5 of the variable focal length lens VL may be changeable. For example, the volume or shape of the variable focal length lens VL may be changed by externally supplied energy to change the radius of curvature of the image side surfaces Sq4 and Sq5. The cover glass CG may be disposed on one surface of the variable focal length lens VL. The cover glass CG may be disposed in close contact with one surface of the variable focal length lens VL to keep one surface of the variable focal length lens VL always flat (the radius of curvature of one surface of the variable focal length lens VL is a value close to infinity). In detail, the radius of curvature of the first surface Sq1 and the second surface Sq2 of the cover glass CG may be a value approximately close to infinity.

[0228] The variable focal length lens VL may include a plurality of components. For example, the variable focal length lens VL may include a first component LQ1 and a second component LQ2. The first component LQ1 may be configured to surround the surface of the second component LQ2. For example, the first component LQ1 may be configured to cover the object side surface and the image side surface of the second component LQ2. The first component LQ1 and the second component LQ2 may be configured to have different refractive indices and Abbe numbers. For example, the refractive index of the second component LQ2 may be greater than the refractive index of the first component LQ1, and the Abbe number of the second component LQ2 may be less than the Abbe number of the first component LQ1. The second component LQ2 may be made of a material that is easily deformed. For example, the second component LQ2 may be deformed to have a size that is the same as or similar to that of the first component LQ1. In detail, the image side surfaces Sq4 and Sq5 of the second component LQ2 may be deformed to have a size that is the same as the radius of curvature of the image side surface Sq4 of the first component LQ1.

[0229] Next, we will refer to Fig. 22 A camera module including an optical imaging system according to example embodiments is described.

[0230] The camera module 10 according to the exemplary embodiment may include a lens barrel 20 and an optical imaging system. The optical imaging system may be any one of the optical imaging systems 100, 200, 300, 400, 500, 600, 700, 800, 900 and 1000 according to the exemplary embodiments described above. The camera module 10 may include a component for supplying energy to the variable focal length lens VL. For example, the camera module 10 may include a device 30 for supplying current to the variable focal length lens VL. The device 30 may be configured to supply energy to the variable focal length lens VL directly or indirectly. As an example, the device 30 may be configured to directly generate heat energy or vibration energy. As another example, the device 30 may be in the form of a connection terminal configured to transfer external power to the variable focal length lens VL. The device 30 may be configured to be disposed outside the lens barrel 20 or disposed in an empty space between the lens barrel 20 and any one of the optical imaging systems 100 , 200 , 300 , 400 , 500 , 600 , 700 , 800 , 900 , and 1000 .

[0231] The camera module 10 may be configured so that autofocus is possible. For example, the camera module 10 may perform autofocus by supplying energy to a variable focal length lens VL included in any one of the optical imaging systems 100, 200, 300, 400, 500, 600, 700, 800, 900, and 1000. Therefore, in the camera module 10 according to the present exemplary embodiment, a driving device for driving any one of the optical imaging systems 100, 200, 300, 400, 500, 600, 700, 800, 900, and 1000 in the optical axis direction may be omitted, and the focal length may be accurately adjusted by the variable focal length lens VL.

[0232] The optical imaging system according to the exemplary embodiment of the present disclosure may adjust the focal length to achieve miniaturization and weight reduction of the camera module.

[0233] In addition, since a camera module including an optical imaging system according to an exemplary embodiment of the present disclosure can automatically focus by changing the shape of a variable focal length lens, the focal length of the camera module can be quickly adjusted and the driving current required for autofocusing of the camera module can be reduced.

[0234] Although specific examples have been shown and described above, it will be apparent after understanding the present disclosure that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are understood in a descriptive sense only and not for limiting purposes. The description of the features or aspects in each example should be considered to be applicable to similar features or aspects in other examples. If the described techniques are performed in a different order, and / or if the components in the described systems, architectures, devices, or circuits are replaced or supplemented in different ways and / or by other components or their equivalents, appropriate results can still be achieved. Therefore, the scope of the present disclosure is not limited by specific embodiments, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in the present disclosure.

Claims

1. An optical imaging system, comprising: A first lens having a positive refractive power; A second lens having a negative refractive power; A third lens having a refractive power; A fourth lens having a convex object side and a convex image side; A fifth lens having a negative refractive power; And A sixth lens having a refractive power, Wherein, the first lens to the sixth lens are arranged in sequence from the object side, Wherein, the optical imaging system includes a total of six lenses, and Wherein, the third lens is a variable focal length lens configured to have a variable focal length.

2. The optical imaging system according to claim 1, wherein: The first lens has a convex object side.

3. The optical imaging system according to claim 1, wherein: The second lens has a convex object side.

4. The optical imaging system according to claim 1, wherein: The fifth lens has a convex object side.

5. The optical imaging system according to claim 1, wherein: The sixth lens has a convex object side.

6. An optical imaging system, comprising: A first lens having a positive refractive power; A second lens having a negative refractive power; A third lens having a refractive power; A fourth lens having a refractive power; A fifth lens having a negative refractive power; And A sixth lens having a refractive power, Wherein, the first lens to the sixth lens are arranged in sequence from the object side, Wherein, the optical imaging system includes a total of six lenses, Wherein, the third lens is a variable focal length lens configured to have a variable focal length, and Wherein, -1.2 < f2 / f4 < -0.4, where f2 is the focal length of the second lens, and f4 is the focal length of the fourth lens.

7. The optical imaging system according to claim 6, wherein: The first lens has a convex object side.

8. The optical imaging system according to claim 6, wherein: The second lens has a convex object side.

9. The optical imaging system according to claim 6, wherein: The fifth lens has a convex object side.

10. The optical imaging system according to claim 6, wherein: The sixth lens has a convex object side.

Images