CN115166945A - Optical imaging system and electronic device - Google Patents

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, wherein an object side surface of the sixth lens is convex, and wherein one of the first lens to the sixth lens is a variable focal length lens configured to have a variable focal length. The disclosure also relates to an electronic device comprising the optical imaging system.

Description

Optical imaging system and electronic device

Cross Reference to Related Applications

This application claims the benefit of priority of korean patent application No. 10-2021-0174344, filed in korean intellectual property office at 12/8/2021, the entire disclosure of which is incorporated herein by reference for all purposes.

Technical Field

The present disclosure relates to an optical imaging system including a variable focal length lens configured to have an adjustable focal length.

Background

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 the lenses that make up the optical imaging system. The camera module may be configured to adjust (auto focus (AF)) the focal length of the optical imaging system for sharp image capture. For example, the camera module may adjust the focal length of the camera module by moving the optical imaging system in the optical axis direction. However, the camera module having the above-described structure may be configured to have a considerably large size to move the optical imaging system in the optical axis direction, and thus it may be difficult to miniaturize the camera module and reduce the weight of the camera module.

The above information is presented merely as background information to aid in understanding the present disclosure. No determination is made as to whether any of the above can be used as prior art with respect to the present disclosure, nor is an assertion made.

Disclosure of Invention

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

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 in order from an object side toward an imaging plane, wherein an object side surface of the sixth lens is convex, and wherein one of the first lens to the sixth lens is a variable focal length lens configured to have a variable focal length.

The image side surface of the first lens may be convex.

The image side surface of the second lens may be concave.

The third lens may be configured as a variable focus lens.

The image side surface of the fourth lens may be convex.

The object side surface of the fifth lens may be convex.

The image side surface of the sixth lens may be concave.

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

T1/TTL can 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 plane.

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.

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

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

L1S1E/T1 can be less than 2.0, where L1S1E is the effective diameter of the object side surface of the first lens and T1 is the thickness of the first lens.

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.

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

The electronic device may comprise a camera module comprising an optical imaging system, wherein the optical imaging system may further comprise an image sensor having a surface on which said imaging plane is formed.

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 surface and a convex image-side surface, a fifth lens having a convex object-side surface, and a sixth lens having a refractive power, wherein the first lens to the sixth lens are arranged in order from an object side, and wherein 0.001< | f1/f6| <0.026, wherein f1 is a focal length of the first lens, and f6 is a focal length of the sixth lens.

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 an object side toward an imaging plane, wherein the third lens is a variable focal length lens configured to have a variable focal length, and wherein 0.07T 1/TTL <0.20, where T1 is a thickness of the first lens, and TTL is a distance from an object side surface of the first lens to the imaging plane.

Other features and aspects will become apparent from the following detailed description, the appended claims, the drawings, and the following drawings.

Drawings

Fig. 1 is a view illustrating an optical imaging system according to a first exemplary embodiment of the present disclosure.

Fig. 2 presents a graph with curves representing aberration characteristics of the optical imaging system shown in fig. 1.

Fig. 3 is a view illustrating an optical imaging system according to a second exemplary embodiment of the present disclosure.

Fig. 4 presents a graph with curves representing aberration characteristics of the optical imaging system shown in fig. 3.

Fig. 5 is a view illustrating an optical imaging system according to a third exemplary embodiment of the present disclosure.

Fig. 6 presents a graph having a curve representing aberration characteristics of the optical imaging system shown in fig. 5.

Fig. 7 is a view illustrating an optical imaging system according to a fourth exemplary embodiment of the present disclosure.

Fig. 8 presents a graph having a curve representing aberration characteristics of the optical imaging system shown in fig. 7.

Fig. 9 is a view illustrating an optical imaging system according to a fifth exemplary embodiment of the present disclosure.

Fig. 10 presents a graph having a curve representing aberration characteristics of the optical imaging system shown in fig. 9.

Fig. 11 is a view illustrating an optical imaging system according to a sixth exemplary embodiment of the present disclosure.

Fig. 12 presents a graph having a curve representing aberration characteristics of the optical imaging system shown in fig. 11.

Fig. 13 is a view illustrating an optical imaging system according to a seventh exemplary embodiment of the present disclosure.

Fig. 14 presents a graph having a curve representing aberration characteristics of the optical imaging system shown in fig. 13.

Fig. 15 is a view illustrating an optical imaging system according to an eighth exemplary embodiment of the present disclosure.

Fig. 16 presents a graph having a curve representing aberration characteristics of the optical imaging system shown in fig. 15.

Fig. 17 is a view illustrating an optical imaging system according to a ninth exemplary embodiment of the present disclosure.

Fig. 18 presents a graph having a curve representing aberration characteristics of the optical imaging system shown in fig. 17.

Fig. 19 is a view illustrating an optical imaging system according to a tenth exemplary embodiment of the present disclosure.

Fig. 20 presents a graph having a curve representing aberration characteristics of the optical imaging system shown in fig. 19.

Fig. 21 is a view showing one form of a variable focus lens.

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

Like reference numerals refer to like elements throughout the drawings and the detailed description. The figures may not be drawn to scale and the relative sizes, proportions and depictions of elements in the figures may be exaggerated for clarity, illustration and convenience.

Detailed Description

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

The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, devices, and/or systems described herein. Various changes, modifications, and equivalents of the methods, devices, and/or systems described herein will, however, be apparent after understanding the present disclosure. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein except as may be necessary in a particular order, but may be varied as will be apparent after understanding the present disclosure. In addition, descriptions of features well known in the art may be omitted for the sake of clarity and conciseness.

The features described herein may be embodied in different forms and should not be construed as 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, apparatuses, and/or systems described herein that will be apparent after understanding the present disclosure.

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

Throughout the specification, when an element such as a layer, region or substrate is described as being "on," "connected to" or "coupled to" another element, it can 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. In contrast, when an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element, there are no other elements intervening between the element and the other element.

The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. The articles "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprising," "including," and "having" specify the presence of stated features, integers, operations, elements, components, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, operations, elements, components, and/or groups thereof.

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

Although terms such as "first", "second", and "third" may be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections are not limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first member, first component, first region, first layer, or first portion referred to in these examples may also be referred to as a second member, second component, second region, second layer, or second portion without departing from the teachings of the examples described herein.

Spatially relative terms such as "over 8230," "above," "upper," "under 8230," "below," "lower," and the like may be used herein for ease of description to describe the relationship of one element to another element as illustrated in the figures. These spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "upper" relative to another element would then be oriented "below" or "lower" relative to the other element. Thus, the phrase "over" encompasses both orientations of "over" and "under", depending on the spatial orientation of the device, 8230 \8230 @. The device may also be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative terms used herein should be interpreted accordingly.

Variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, may be expected. Thus, examples described herein are not limited to the specific shapes shown in the drawings, but include changes in shape that occur during manufacturing.

It should be noted that use of the word "may" with respect to an example herein, such as with respect to what an example may include or implement, means that there is at least one example in which such features are included or implemented, and all examples are not so limited.

The features of the examples described herein may be combined in various ways that will be apparent after understanding the present disclosure. Further, while the examples described herein have a variety of configurations, other configurations are possible as will be apparent after understanding the present disclosure.

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

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

The optical imaging systems 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, and the like. However, the application range and application examples of the optical imaging system described herein are not limited to the above-described electronic devices. For example, the optical imaging system is applicable to electronic devices that provide a narrow installation space but require high-resolution image capturing.

The optical imaging system according to the first aspect of the present disclosure may include a plurality of lenses arranged in order 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 in this order from the object side toward the imaging plane.

The optical imaging system according to the first aspect may comprise a variable focus lens configured to have a variable focus. For example, one of the first to sixth lenses 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 focus lens may have a focal length of-1100 mm to 60 mm. The variable focus lens may be configured such that its focal length varies continuously. For example, when the radius of curvature of the image side surface of the variable focusing lens varies arbitrarily in the range of 600mm to-50 mm, the variable focusing lens may have any focal length within the above range. As a specific example, the focal length of the variable focus lens may vary to any value within the above-mentioned range, such as-980 mm, -870mm, 10mm, or 32mm.

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

The optical imaging system according to the first aspect configured as described above may have a plurality of focal lengths by the variable focal length lens. For example, the focal length of the optical imaging system can be changed by changing the focal length of the variable focusing lens. As an example, the optical imaging system may have a maximum first focal length when the variable focusing lens has a maximum focal length. As another example, when the variable focal length lens has a standard (normal) focal length, the optical imaging system may also have a standard second focal length. As yet another example, when the variable focusing 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 through the first to third focal distances, or perform auto-focusing of the camera module.

The variable focus lens may have a predetermined abbe number. As an example, the abbe number of the variable focus lens may be less than 40. As a specific example, the abbe number of the variable focus lens may be greater than 20 and less than 40. The variable focus lens may have a predetermined refractive index. As an example, the refractive index of the variable focus lens may be less than 1.6. As a specific example, the refractive index of the variable focus lens may be greater than 1.5 and less than 1.6.

The optical imaging system according to the second aspect of the present disclosure may include a plurality of lenses arranged in order 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, which are arranged in order from the object side toward the imaging surface.

The optical imaging system according to the second aspect may include two or more lenses of which at least one surface is convex. For example, the optical imaging system according to the second aspect may include: a fourth lens element having a convex object-side surface and a convex image-side surface; and a fifth lens with a convex object side.

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, wherein f1 is a focal length of the first lens, and f6 is a focal length of the sixth lens.

An optical imaging system according to a 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 two or more of the following conditional expressions may be satisfied. 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.

0.8<SD/TD

0.07<T1/TTL<0.20

25<V1-V2<45

0.5<LD/TD<0.8

-500mm<fv<50.0mm

L1S1E/T1<2.0

D12/f<0.2

L3S1ER<1.5mm

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

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

1.7<L1S1E/T1<2.0

0.005<D12/f<0.01

1.0mm<L3S1ER<1.4mm

An 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 two or more of the following conditional expressions may be satisfied. 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.

-1.2<f2/f4<-0.4

0.7<f2/f5<1.2

-1.2<(R1+R2)/(R1-R2)<-0.4

0.01<R1/(R9+R10)<0.12

0.6<R1/(R11+R12)<1.2

8.0<(R9+R10)/(R11+R12)<12.0

1.6<R1/R11<2.0

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

The optical imaging system according to the first to fourth aspects may include one or more lenses having the following characteristics, if necessary. 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 aspect does not necessarily include a lens having the following characteristics.

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

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 workability. 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 more than 50 and less than 60.

The second lens may have an optical 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 workability. 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.

The third lens may have an optical 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 auto-focus of the optical imaging system. For example, the third lens may be configured as a variable focal length lens with variable focal length.

The fourth lens may have an optical 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 or image side of the fourth lens may be aspheric. The fourth lens may be formed of a material having high light transmittance and excellent workability. 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 more than 50 and less than 60.

The fifth lens may have an optical 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 or image side of the fifth lens may be aspheric. The fifth lens may include an inflection point. For example, an 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 workability. 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 more than 18 and less than 24.

The sixth lens may have an optical 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 aspherical surface. For example, the object side or image side of the sixth lens may be aspheric. The sixth lens may include an inflection point. For example, an 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 high light transmittance and excellent workability. 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 more than 50 and less than 60.

The aspherical surfaces of the first to sixth lenses may be represented by the following equation 1:

equation 1

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

The optical imaging system may further include a cover glass. As an example, the optical imaging system may comprise a cover glass arranged on the object-side or image-side surface of the variable focusing lens. The optical imaging system may further comprise a filter. The filter may be disposed between the sixth lens and the imaging surface. The filter may be configured to block light of a particular wavelength. For example, the filter may be configured to block infrared rays. The optical imaging system may include an imaging surface. The imaging plane may be formed on the surface of the image sensor or inside the image sensor.

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

An optical imaging system according to a first exemplary embodiment is described below with reference to fig. 1.

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.

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

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, the variable focal length lens VL may have a positive refractive power or a negative refractive power according to the shape of the shape varying portion LQ. Further, the shape varying portion LQ may vary the focal length of the variable focal length lens VL by varying the radius of curvature of the variable focal length lens VL. For example, the shape varying portion LQ may change the focal length of the variable focusing lens VL by increasing or decreasing the radius of curvature of the second surface of the variable focusing lens VL. The fourth lens 140 may have a 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 a negative refractive power, and an object side surface thereof may be convex while an image side surface thereof may be concave. The fifth lens 150 may have an inflection point. The sixth lens 160 may have a negative refractive power, and an object side surface thereof may be convex while an image side surface thereof may be concave. The sixth lens 160 may have an inflection point.

The optical imaging system 100 may include an imaging plane IP. In the present exemplary embodiment, the imaging plane IP may be formed on the surface of the image sensor IS. The optical imaging system 100 may include a diaphragm 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 a filter IF. The filter IF may be disposed between the sixth lens 160 and the imaging plane IP.

Table 1 and table 2 show lens characteristics and aspherical coefficients of the optical imaging system according to the present exemplary embodiment, respectively, and fig. 2 presents a graph having a curve showing aberration characteristics of the optical imaging system according to the present exemplary embodiment.

TABLE 1

TABLE 2

Noodle 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
Noodle 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

An optical imaging system according to a second exemplary embodiment will be described with reference to fig. 3.

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.

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

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, the variable focal length lens VL may have a positive refractive power or a negative refractive power according to the shape of the shape varying portion LQ. Further, the shape varying portion LQ may vary the focal length of the variable focal length lens VL by varying the radius of curvature of the variable focal length lens VL. For example, the shape varying portion LQ may change the focal length of the variable focusing lens VL by increasing or decreasing the radius of curvature of the second surface of the variable focusing lens VL. Fourth lens 240 may have positive optical power and its object-side surface may be convex while its image-side surface may be convex. The fifth lens 250 may have a negative refractive power, and an object side surface thereof may be convex while an image side surface thereof 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.

The optical imaging system 200 may include an imaging plane IP. In the present exemplary embodiment, the imaging plane IP may be formed on the surface of the image sensor IS. The optical imaging system 200 may include a diaphragm 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 image plane IP.

Table 3 and table 4 show lens characteristics and aspherical coefficients of the optical imaging system according to the present exemplary embodiment, respectively, and fig. 4 presents a graph having a curve showing aberration characteristics of the optical imaging system according to the present exemplary embodiment.

TABLE 3

TABLE 4

An optical imaging system according to a third exemplary embodiment will be described with reference to fig. 5.

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.

The optical imaging system 300 may include a variable focus lens. For example, one of the first through sixth lenses 310 through 360 may be a variable focal length lens.

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, the variable focal length lens VL may have a positive refractive power or a negative refractive power according to the shape of the shape varying portion LQ. Further, the shape varying portion LQ may vary the focal length of the variable focal length lens VL by varying the radius of curvature of the variable focal length lens VL. For example, the shape varying portion LQ may change the focal length of the variable focusing lens VL by increasing or decreasing the radius of curvature of the second surface of the variable focusing lens VL. Fourth lens 340 may have positive optical power, and its object-side surface may be convex while its image-side surface may be convex. The fifth lens 350 may have a negative refractive power, and an object side surface thereof may be convex while an image side surface thereof 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.

The optical imaging system 300 may include an imaging plane IP. In the present exemplary embodiment, the imaging plane IP may be formed on the surface of the image sensor IS. The optical imaging system 300 may include a diaphragm 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.

Table 5 and table 6 show lens characteristics and aspherical coefficients of the optical imaging system according to the present exemplary embodiment, respectively, and fig. 6 presents a graph having a curve showing aberration characteristics of the optical imaging system according to the present exemplary embodiment.

TABLE 5

Noodle number	Component 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	Third lens	Infinity(s)	0.1000	1.516	64.2	1.100
S6		Infinity(s)	0.2800	1.548	30.0	1.100
							S7		Infinity(s)	0.0200	1.529	65.4	1.100
S8		Infinity(s)	0.2000			1.100
							S9	Fourth lens	59.4471	0.3688	1.534	55.7	1.260
S10		-9.2225	0.1400			1.432
							S11	Fifth lens element	14.3214	0.4500	1.647	21.5	1.760
S12		4.3088	0.2674			2.180
							S13	Sixth lens element	0.9944	0.5333	1.534	55.7	2.460
S14		0.8118	0.5286			2.780
							S15	Light filter	Infinity(s)	0.2100
S16		Infinity(s)	0.2040
							S17	Image plane		-0.0176

TABLE 6

An optical imaging system according to a fourth exemplary embodiment will be described with reference to fig. 7.

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.

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

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, the variable focusing lens VL may have a positive refractive power or a negative refractive power depending on the shape of the shape varying portion LQ. Further, the shape varying portion LQ may vary the focal length of the variable focal length lens VL by varying the radius of curvature of the variable focal length lens VL. For example, the shape varying portion LQ may change the focal length of the variable focusing lens VL by increasing or decreasing the radius of curvature of the second surface of the variable focusing lens VL. Fourth lens 440 may have positive optical power and its object-side surface may be convex while its image-side surface may be convex. The fifth lens 450 may have a negative refractive power, and an object side surface thereof may be convex while an image side surface thereof may be concave. The fifth lens 450 may have an inflection point. The sixth lens 460 may have a positive refractive power, and an object side surface thereof may be convex while an image side surface thereof may be concave. The sixth lens 460 may have an inflection point.

The optical imaging system 400 may include an imaging plane IP. In the present exemplary embodiment, the imaging plane IP may be formed on the surface of the image sensor IS. The optical imaging system 400 may include a diaphragm 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.

Table 7 and table 8 show lens characteristics and aspherical coefficients of the optical imaging system according to the present exemplary embodiment, respectively, and fig. 8 presents a graph having a curve showing aberration characteristics of the optical imaging system according to the present exemplary embodiment.

TABLE 7

Noodle number	Component 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	Third lens	Infinity(s)	0.1000	1.516	64.2	1.100
S6		Infinity(s)	0.2800	1.548	30.0	1.100
							S7		Infinity(s)	0.0200	1.529	65.4	1.100
S8		Infinity(s)	0.2000			1.100
							S9	Fourth lens	66.8001	0.3687	1.534	55.7	1.260
S10		-9.1120	0.1400			1.432
							S11	Fifth lens element	14.6828	0.4500	1.647	21.5	1.760
S12		4.3259	0.2560			2.180
							S13	Sixth lens element	0.9923	0.5252	1.534	55.7	2.460
S14		0.8100	0.5285			2.780
							S15	Light filter	Infinity(s)	0.2100
S16		Infinity(s)	0.2024
							S17	Image plane		-0.0159

TABLE 8

An optical imaging system according to a fifth exemplary embodiment will be described with reference to fig. 9.

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

The optical imaging system 500 may include a variable focus lens. For example, one of the first through sixth lenses 510 through 560 may be a variable focal length lens.

The first lens 510 may have positive optical 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, the variable focusing lens VL may have a positive refractive power or a negative refractive power depending on the shape of the shape varying portion LQ. Further, the shape varying portion LQ may vary the focal length of the variable focal length lens VL by varying the radius of curvature of the variable focal length lens VL. For example, the shape varying portion LQ may change the focal length of the variable focusing lens VL by increasing or decreasing the radius of curvature of the second surface of the variable focusing lens VL. Fourth lens 540 may have a 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 a negative refractive power, and an object side surface thereof may be convex while an image side surface thereof may be concave. The fifth lens 550 may have an inflection point. The sixth lens 560 may have positive optical 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.

The optical imaging system 500 may include an imaging plane IP. In the present exemplary embodiment, the imaging plane IP may be formed on the surface of the image sensor IS. The optical imaging system 500 may include a diaphragm 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.

Table 9 and table 10 show lens characteristics and aspherical coefficients of the optical imaging system according to the present exemplary embodiment, respectively, and fig. 10 presents a graph having a curve showing aberration characteristics of the optical imaging system according to the present exemplary embodiment.

TABLE 9

TABLE 10

Noodle 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
Noodle 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

An optical imaging system according to a sixth exemplary embodiment will be described with reference to fig. 11.

The optical imaging system 600 according to the sixth exemplary embodiment may include a plurality of lenses. For example, 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.

The optical imaging system 600 may include a variable focus lens. For example, one of the first through sixth lenses 610 through 660 may be a variable focal length lens.

The first lens 610 may have positive optical 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 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, the variable focusing lens VL may have a positive refractive power or a negative refractive power depending on the shape of the shape varying portion LQ. Further, the shape varying portion LQ may vary the focal length of the variable focal length lens VL by varying the radius of curvature of the variable focal length lens VL. For example, the shape varying portion LQ may change the focal length of the variable focusing lens VL by increasing or decreasing the radius of curvature of the second surface of the variable focusing 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 a negative refractive power, and an object side surface thereof may be convex while an image side surface thereof may be concave. The fifth lens 650 may have an inflection point. The sixth lens 660 may have a positive refractive power, and an object side surface thereof may be convex while an image side surface thereof may be concave. The sixth lens 660 may have an inflection point.

The optical imaging system 600 may include an imaging plane IP. In the present exemplary embodiment, the imaging plane IP may be formed on the surface of the image sensor IS. The optical imaging system 600 may include a diaphragm 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 image plane IP.

Table 11 and table 12 show lens characteristics and aspherical coefficients of the optical imaging system according to the present exemplary embodiment, respectively, and fig. 12 presents a graph having a curve showing aberration characteristics of the optical imaging system according to the present exemplary embodiment.

TABLE 11

Noodle numbering	Component 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	Third lens	Infinity(s)	0.1000	1.516	64.2	1.100
S6		Infinity(s)	0.2800	1.548	30.0	1.100
							S7		Infinity(s)	0.0200	1.529	65.4	1.100
S8		Infinity(s)	0.2000			1.100
							S9	Fourth lens	57.0419	0.4169	1.534	55.7	1.198
S10		-9.2670	0.1413			1.432
							S11	Fifth lens element	14.1090	0.4500	1.647	21.5	1.726
S12		4.1534	0.2858			2.150
							S13	Sixth lens element	1.0041	0.5499	1.534	55.7	2.416
S14		0.8212	0.4950			2.738
							S15	Light filter	Infinity(s)	0.2100
S16		Infinity(s)	0.2000
							S17	Image plane		0.0200

TABLE 12

An optical imaging system according to a seventh exemplary embodiment will be described with reference to fig. 13.

The optical imaging system 700 according to the seventh exemplary embodiment may include a plurality of lenses. For example, 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.

The optical imaging system 700 may include a variable focus lens. For example, one of the first through sixth lenses 710 through 760 may be a variable focal length lens.

The first lens 710 may have positive optical 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 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, the variable focusing lens VL may have a positive refractive power or a negative refractive power depending on the shape of the shape varying portion LQ. Further, the shape varying portion LQ may vary the focal length of the variable focal length lens VL by varying the radius of curvature of the variable focal length lens VL. For example, the shape varying portion LQ may change the focal length of the variable focusing lens VL by increasing or decreasing the radius of curvature of the second surface of the variable focusing lens VL. Fourth lens 740 may have positive optical power, and its object-side surface may be convex while its image-side surface may be convex. The fifth lens 750 may have a negative refractive power, and an object side surface thereof may be convex while an image side surface thereof may be concave. The fifth lens 750 may have an inflection point. Sixth lens 760 may have a 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.

The optical imaging system 700 may include an imaging plane IP. In the present exemplary embodiment, the imaging plane IP may be formed on the surface of the image sensor IS. The optical imaging system 700 may include a diaphragm 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 a filter IF. The filter IF may be disposed between the sixth lens 760 and the imaging plane IP.

Table 13 and table 14 show lens characteristics and aspherical coefficients of the optical imaging system according to the present exemplary embodiment, respectively, and fig. 14 presents a graph having a curve showing aberration characteristics of the optical imaging system according to the present exemplary embodiment.

Watch 13

Noodle number	Component 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	Third lens	Infinity(s)	0.1000	1.516	64.2	1.100
S6		Infinity(s)	0.2800	1.548	30.0	1.100
							S7		Infinity(s)	0.0200	1.529	65.4	1.100
S8		Infinity(s)	0.2000			1.100
							S9	Fourth lens	57.3964	0.3884	1.534	55.7	1.260
S10		-9.2470	0.1422			1.432
							S11	Fifth lens element	14.1780	0.4500	1.647	21.5	1.760
S12		4.3684	0.2809			2.180
							S13	Sixth lens element	1.0053	0.5370	1.534	55.7	2.460
S14		0.8126	0.5103			2.780
							S15	Light filter	Infinity(s)	0.2100
S16		Infinity(s)	0.2000
							S17	Image plane		0.0047

TABLE 14

An optical imaging system according to an eighth exemplary embodiment will be described with reference to fig. 15.

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.

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

First lens 810 may have a positive optical 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 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, the variable focal length lens VL may have a positive refractive power or a negative refractive power according to the shape of the shape varying portion LQ. Further, the shape varying portion LQ may vary the focal length of the variable focal length lens VL by varying the radius of curvature of the variable focal length lens VL. For example, the shape varying portion LQ may change the focal length of the variable focusing lens VL by increasing or decreasing the radius of curvature of the second surface of the variable focusing lens VL. The fourth lens 840 may have a 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 a 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.

The optical imaging system 800 may include an imaging plane IP. In the present exemplary embodiment, the imaging plane IP may be formed on the surface of the image sensor IS. The optical imaging system 800 may include a diaphragm 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 a filter IF. The filter IF may be disposed between the sixth lens 860 and the imaging plane IP.

Table 15 and table 16 show lens characteristics and aspherical coefficients of the optical imaging system according to the present exemplary embodiment, respectively, and fig. 16 presents a graph having a curve showing aberration characteristics of the optical imaging system according to the present exemplary embodiment.

Watch 15

TABLE 16

Noodle numbering	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
Noodle numbering	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

An optical imaging system according to a ninth exemplary embodiment will be described with reference to fig. 17.

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.

The optical imaging system 900 may include a variable focus lens. For example, one of the first through sixth lenses 910 through 960 may be a variable focal length lens.

First lens 910 may have a positive optical 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 an object side surface thereof may be convex while an image side surface thereof 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 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, the variable focal length lens VL may have a positive refractive power or a negative refractive power according to the shape of the shape varying portion LQ. Further, the shape varying portion LQ may vary the focal length of the variable focal length lens VL by varying the radius of curvature of the variable focal length lens VL. For example, the shape varying portion LQ may change the focal length of the variable focusing lens VL by increasing or decreasing the radius of curvature of the second surface of the variable focusing lens VL. The fourth lens 940 may have a positive refractive power, and an object side surface thereof may be convex while an image side surface thereof may be convex. The fifth lens 950 may have a negative refractive power, and the object side surface thereof may be convex while the image side surface thereof may be concave. The fifth lens 950 may have an inflection point. The sixth lens 960 may have a positive 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.

Optical imaging system 900 may include an imaging plane IP. In the present exemplary embodiment, the imaging plane IP may be formed on the surface of the image sensor IS. The optical imaging system 900 may include a diaphragm 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 a filter IF. The filter IF may be disposed between the sixth lens 960 and the imaging plane IP.

Table 17 and table 18 show lens characteristics and aspherical coefficients of the optical imaging system according to the present exemplary embodiment, respectively, and fig. 18 presents a graph having a curve showing aberration characteristics of the optical imaging system according to the present exemplary embodiment.

TABLE 17

Noodle numbering	Component 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	Third lens	Infinity(s)	0.1000	1.516	64.2	1.100
S6		Infinity(s)	0.2800	1.548	30.0	1.100
							S7		Infinity(s)	0.0200	1.529	65.4	1.100
S8		Infinity(s)	0.2000			1.100
							S9	Fourth lens	57.2654	0.3636	1.534	55.7	1.204
S10		-9.2625	0.1400			1.432
							S11	Fifth lens element	14.3082	0.4374	1.647	21.5	1.722
S12		4.1496	0.2575			2.142
							S13	Sixth lens element	0.9826	0.5133	1.534	55.7	2.411
S14		0.8094	0.5288			2.727
							S15	Light filter	Infinity(s)	0.2100
S16		Infinity(s)	0.2062
							S17	Image plane		-0.0200

Watch 18

An optical imaging system according to a tenth exemplary embodiment will be described with reference to fig. 19.

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.

The optical imaging system 1000 may include a variable focus lens. For example, one of the first through sixth lenses 1010 through 1060 may be a variable focal length lens.

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 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, the variable focusing lens VL may have a positive refractive power or a negative refractive power depending on the shape of the shape varying portion LQ. Further, the shape varying portion LQ may vary the focal length of the variable focal length lens VL by varying the radius of curvature of the variable focal length lens VL. For example, the shape varying portion LQ may change the focal length of the variable focusing lens VL by increasing or decreasing the radius of curvature of the second surface of the variable focusing lens VL. Fourth lens 1040 may have positive optical power and its object-side surface may be convex while its image-side surface may be convex. Fifth lens 1050 may have a 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 a positive refractive power, and an object side surface thereof may be convex while an image side surface thereof may be concave. The sixth lens 1060 may have an inflection point.

Optical imaging system 1000 may include an imaging plane IP. In the present exemplary embodiment, the imaging plane IP may be formed on the surface of the image sensor IS. The optical imaging system 1000 may include a diaphragm 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 image plane IP.

Tables 19 and 20 show lens characteristics and aspherical coefficients of the optical imaging system according to the present exemplary embodiment, respectively, and fig. 20 presents a graph having a curve showing aberration characteristics of the optical imaging system according to the present exemplary embodiment.

Watch 19

Noodle numbering	Component 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	Third lens	Infinity(s)	0.1000	1.516	64.2	1.100
S6		Infinity(s)	0.2800	1.548	30.0	1.100
							S7		Infinity(s)	0.0200	1.529	65.4	1.100
S8		Infinity(s)	0.2000			1.100
							S9	Fourth lens	57.1728	0.3594	1.534	55.7	1.204
S10		-9.2674	0.1400			1.432
							S11	Fifth lens element	14.2907	0.4297	1.647	21.5	1.722
S12		4.1342	0.2551			2.142
							S13	Sixth lens element	0.9806	0.5053	1.534	55.7	2.411
S14		0.8068	0.5288			2.727
							S15	Light filter	Infinity(s)	0.2100
S16		Infinity(s)	0.2062
							S17	Image plane		-0.0200

Watch 20

Tables 21 and 22 represent optical characteristic values and values of conditional expressions of the optical imaging systems according to the first to tenth exemplary embodiments, respectively.

TABLE 21

TABLE 22

Next, the structure of the variable focal length lens will be described with reference to fig. 21.

The variable focal length lens VL according to one form may be configured to have a predetermined optical power. For example, the variable focusing lens VL may have a positive refractive power. One surface of the variable focusing lens VL may be convex. For example, as shown in fig. 21, the image side surfaces Sq4 and Sq5 of the variable focal length lens VL may be convex. One surface of the variable focusing lens VL may be flat. For example, as shown in fig. 21, the object-side surface Sq3 of the variable focusing 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 surfaces or image sides Sq4 and Sq5 of the variable focal length lens VL may be variable. 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 Sq 5. The cover glass CG may be provided 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 radii of curvature of the first surface Sq1 and the second surface Sq2 of the cover glass CG may be a value close to infinity.

The variable focal length lens VL may include a plurality of members. For example, the variable focal length lens VL may include a first member LQ1 and a second member LQ2. The first member LQ1 may be disposed to surround a surface of the second member LQ2. For example, the first member LQ1 may be configured to cover the object-side surface and the image-side surface of the second member LQ2. The first and second members LQ1 and LQ2 may be configured to have different refractive indices and abbe numbers. For example, the refractive index of the second member LQ2 may be larger than the refractive index of the first member LQ1, and the abbe number of the second member LQ2 may be smaller than the abbe number of the first member LQ 1. The second member LQ2 may be made of a material that is easily deformable. For example, the second member LQ2 may be deformed to have the same or similar size as that of the first member LQ 1. In detail, the image side surfaces Sq4 and Sq5 of the second member LQ2 may be deformed to have the same size as the radius of curvature of the image side surface Sq4 of the first member LQ 1.

Next, a camera module including the optical imaging system according to an exemplary embodiment will be described with reference to fig. 22.

The camera module 10 according to an 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 above-described exemplary embodiments. The camera module 10 may comprise means for supplying energy to the variable focus lens VL. For example, the camera module 10 may comprise a device 30 for supplying a current to the variable focus lens VL. The device 30 may be configured to supply energy directly or indirectly to the variable focus lens VL. As an example, the device 30 may be configured to directly generate thermal energy or vibrational energy. As another example, the device 30 may be in the form of a connection terminal configured to transfer external power to the variable focus lens VL. The device 30 may be configured to be disposed outside the lens barrel 20 or 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.

The camera module 10 may be configured such that autofocus is possible. For example, the camera module 10 may perform auto-focusing 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.

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

Further, since a camera module including the optical imaging system according to the exemplary embodiment of the present disclosure can be automatically focused by changing the shape of the variable focal length lens, the focal length of the camera module can be rapidly adjusted and a driving current required for the automatic focusing of the camera module can be reduced.

While 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 to be considered in a descriptive sense only and not for purposes of limitation. The description of features or aspects in each example should be considered applicable to similar features or aspects in other examples. Suitable results may still be achieved if the described techniques are performed in a different order and/or if components in the described systems, architectures, devices, or circuits are combined in a different manner and/or replaced or supplemented by other components or their equivalents. Therefore, the scope of the present disclosure is defined not by the specific embodiments but by the claims and their equivalents, and all modifications within the scope of the claims and their equivalents should be understood as being included in the present disclosure.

Claims (20)

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 order from the object side toward an imaging surface,

wherein an object side surface of the sixth lens is convex,

wherein one of the first lens to the sixth lens is a variable focal length lens configured to have a variable focal length, an

Wherein the optical imaging system comprises a total of six lenses.

2. The optical imaging system of claim 1, wherein the image side surface of the first lens is convex.

3. The optical imaging system of claim 1, wherein an image side surface of the second lens is concave.

4. The optical imaging system of claim 1, wherein the third lens is configured as the variable focal length lens.

5. The optical imaging system of claim 1, wherein an image side surface of the fourth lens is convex.

6. The optical imaging system of claim 1, wherein an object side surface of the fifth lens is convex.

7. The optical imaging system of claim 1, wherein an image side surface of the sixth lens is concave.

8. The optical imaging system of claim 1, wherein 0.8<sd/TD, where SD is a distance from a diaphragm to an image-side surface of the sixth lens and TD is a distance from an object-side surface of the first lens to the image-side surface of the sixth lens.

9. The optical imaging system of claim 1, wherein 0.07T 1/TTL <0.20, wherein T1 is a thickness of the first lens and TTL is a distance from an object side surface of the first lens to the imaging surface.

10. The optical imaging system of claim 1, wherein 25 n V1-V2<45, wherein V1 is the abbe number of the first lens and V2 is the abbe number of the second lens.

11. The optical imaging system of claim 1, wherein 0.5 ± LD/TD <0.8, where LD is the distance from an object-side surface of the variable focus lens to an image-side surface of the sixth lens and TD is the distance from an object-side surface of the first lens to the image-side surface of the sixth lens.

12. The optical imaging system according to claim 1, wherein-500mm < -fv < -50.0 mm, where fv is a focal length of the variable-focal-length lens.

13. The optical imaging system of claim 1, wherein L1S1E/T1<2.0, wherein L1S1E is an effective diameter of an object side surface of the first lens, and T1 is a thickness of the first lens.

14. The optical imaging system of claim 1, wherein D12/f <0.2, wherein D12 is a distance from an image side surface of the first lens to an object side surface of the second lens, and f is a focal length of the optical imaging system.

15. The optical imaging system of claim 1, wherein L3S1ER <1.5mm, wherein L3S1ER is an effective radius of an object-side surface of the third lens.

16. An electronic device, comprising:

a camera module comprising the optical imaging system of claim 1,

wherein the optical imaging system further comprises an image sensor having a surface on which the imaging plane is formed.

17. An optical imaging system comprising:

a first lens having refractive power;

a second lens having refractive power;

a third lens having refractive power;

a fourth lens having a convex object-side surface and a convex image-side surface;

a fifth lens having a convex object-side surface; and

a sixth lens having a refractive power,

wherein the first lens to the sixth lens are arranged in order from an object side,

wherein 0.001< | f1/f6| <0.026, wherein f1 is a focal length of the first lens, and f6 is a focal length of the sixth lens, and

wherein the optical imaging system comprises a total of six lenses.

18. An electronic device, comprising:

a camera module comprising the optical imaging system of claim 17,

wherein the optical imaging system further comprises an image sensor having a surface on which an imaging plane of the optical imaging system is formed.

19. 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 order from the object side toward an imaging surface,

wherein the third lens is a variable focal length lens configured to have a variable focal length,

wherein 0.07T 1/TTL <0.20, where T1 is a thickness of the first lens, and TTL is a distance from an object side surface of the first lens to the imaging surface, and

wherein the optical imaging system comprises a total of six lenses.

20. An electronic device, comprising:

a camera module comprising the optical imaging system of claim 19,

wherein the optical imaging system further comprises an image sensor having a surface on which the imaging plane is formed.

Images