Optical imaging system

Abstract

An optical imaging system includes a first lens group including two or more lenses, and a second lens group including two or more lenses. The first lens group and the second lens group are sequentially arranged from an object side, and the second lens group is configured to be movable in an optical axis direction. 0.8 < TTL / f < 1.2. Here, TTL is a distance from an object side surface of a frontmost lens of the first lens group to an imaging surface, and f is a focal length of the optical imaging system.

Description

[0001] Cross - reference to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10 - 2021 - 0167234, filed on November 29, 2021 with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. Technical field

[0003] The present disclosure relates to an optical imaging system configured to be capable of macro - photography. Background art

[0004] A mobile terminal may include multiple camera modules. For example, a mobile terminal may include a first camera module mounted on the front surface of the terminal body and a second camera module mounted on the rear surface of the terminal body. The first camera module and the second camera module may have different optical characteristics. For example, the first camera module may include a wide - angle optical imaging system to enable video calls and allow the user of the mobile terminal to take self - portraits, and the second camera module may include an optical imaging system with a relatively long focal length to capture images of objects located at a long distance or an intermediate distance. Therefore, it is difficult to capture images of objects located at an intermediate distance and a long distance using the first camera module of the mobile terminal, and it is difficult to capture images of objects located at a short distance or an ultra - short distance using the second camera module.

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

[0006] The Summary of the Invention section is intended to introduce, in a brief form, selections of inventive concepts, which will be further described in the Detailed Description section below. The Summary of the Invention section is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter.

[0007] In one general aspect, an optical imaging system includes: a first lens group including two or more lenses; and a second lens group including two or more lenses. The first lens group and the second lens group are arranged in order from the object side, the second lens group is configured to be movable in the optical axis direction, and 0.8 < TTL / f < 1.2, where TTL is the distance from the object side surface of the foremost lens of the first lens group to the imaging surface, and f is the focal length of the optical imaging system.

[0008] |fG1 / fG2| can be greater than 0.7 and less than 1.4, where fG1 is a focal length of the first lens group and fG2 is a focal length of the second lens group.

[0009] The first lens group can include, arranged in order from the object side, a first lens, a second lens, and a third lens.

[0010] The first lens can have a positive refractive power, the second lens can have a negative refractive power, and the third lens can have a positive refractive power.

[0011] f3 / f can be greater than 0.32 and less than 0.82, where f3 is a focal length of the third lens.

[0012] An image side surface of the third lens can be convex.

[0013] The second lens group can include, arranged in order from the object side, a fourth lens, a fifth lens, and a sixth lens.

[0014] Two of the fourth lens through the sixth lens can have a negative refractive power.

[0015] TTL / IMG HT can be greater than 4.0 and less than 7.0, where IMG HT is a height of an image plane.

[0016] In another general aspect, an optical imaging system includes, arranged in order from an object side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, an image side surface of the third lens is convex, and where 0.8 < TTL / f < 1.2, 0.32 < f3 / f < 0.82, and -1.0 < R1 / R4 < 1.0, where TTL is a distance from an object side surface of the first lens to an image plane, f is a focal length of the optical imaging system, f3 is a focal length of the third lens, R1 is a radius of curvature of the object side surface of the first lens, and R4 is a radius of curvature of the image side surface of the second lens.

[0017] An image side surface of the second lens can be concave.

[0018] An image side surface of the fifth lens can be convex.

[0019] An object side surface of the sixth lens can be concave.

[0020] The fourth lens can have a positive refractive power.

[0021] The fifth lens can have a negative refractive power.

[0022] BFL / f can be greater than 0.23 and less than 0.46, where BFL is a distance from an image side surface of the sixth lens to an image plane.

[0023] In another general aspect, an optical imaging system includes first, second, third, fourth, fifth, and sixth lenses arranged in order from an object side and divided into a first lens group and a second lens group, each of the first and second lens groups having two or more lenses, wherein the second lens group is disposed toward an image side of the first lens group and configured to be movable in an optical axis direction, and wherein the optical imaging system includes no more than six lenses.

[0024] The first lens group can include the first through third lenses, and the second lens group can include the fourth through sixth lenses.

[0025] TTL / f can be greater than 0.8 and less than 1.2, f3 / f can be greater than 0.32 and less than 0.82, and R1 / R4 can be greater than -1.0 and less than 1.0, where TTL is a distance from an object side surface of the first lens to an image plane, f is a focal length of the optical imaging system, f3 is a focal length of the third lens, R1 is a radius of curvature of the object side surface of the first lens, and R4 is a radius of curvature of the image side surface of the second lens.

[0026] The first lens group can include the first through fourth lenses, and the second lens group can include the fifth and sixth lenses.

[0027] TTL / f can be greater than 0.8 and less than 1.2, f3 / f can be greater than 0.32 and less than 0.82, and R1 / R4 can be greater than -1.0 and less than 1.0, where TTL is a distance from an object side surface of the first lens to an image plane, f is a focal length of the optical imaging system, f3 is a focal length of the third lens, R1 is a radius of curvature of the object side surface of the first lens, and R4 is a radius of curvature of the image side surface of the second lens.

[0028] Other features and aspects will become apparent from the accompanying claims, drawings, and following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a view illustrating an optical imaging system according to a first exemplary embodiment of the present disclosure.

[0030] Figure 2 illustrating aberration characteristics of the optical imaging system shown. Figure 1 is a graph illustrating curves of aberration characteristics of the optical imaging system shown.

[0031] Figure 3 is a view illustrating an optical imaging system according to a second exemplary embodiment of the present disclosure.

[0032] Figure 4 illustrating aberration characteristics of the optical imaging system shown. Figure 3 is a graph illustrating curves of aberration characteristics of the optical imaging system shown.

[0033] Figure 5 is a view illustrating an optical imaging system according to a third exemplary embodiment of the present disclosure.

[0034] Figure 6 a graph showing curves representing Figure 5 aberration characteristics of the optical imaging system shown.

[0035] Figure 7 is a view showing an optical imaging system according to a fourth example embodiment of the present disclosure.

[0036] Figure 8 a graph showing curves representing Figure 7 aberration characteristics of the optical imaging system shown.

[0037] Figure 9 is a view showing an optical imaging system according to a fifth example embodiment of the present disclosure.

[0038] Figure 10 a graph showing curves representing Figure 9 aberration characteristics of the optical imaging system shown.

[0039] Figure 11 is a view showing an optical imaging system according to a sixth example embodiment of the present disclosure.

[0040] Figure 12 a graph showing curves representing Figure 11 aberration characteristics of the optical imaging system shown.

[0041] Figure 13 is a view showing an optical imaging system according to a seventh example embodiment of the present disclosure.

[0042] Figure 14 a graph showing curves representing Figure 13 aberration characteristics of the optical imaging system shown.

[0043] Figure 15 is a view showing an optical imaging system according to an eighth example embodiment of the present disclosure.

[0044] Figure 16 a graph showing curves representing Figure 15 aberration characteristics of the optical imaging system shown.

[0045] Figure 17 is a view showing an optical imaging system according to a ninth example embodiment of the present disclosure.

[0046] Figure 18 a graph showing curves representing Figure 17 aberration characteristics of the optical imaging system shown.

[0047] Figure 19is a view showing another form of the optical imaging system according to the first to ninth example embodiments.

[0048] Throughout the drawings and detailed description, identical reference numbers indicate identical elements. The drawings can not be to scale and the relative dimensions of the depicted exemplary embodiments can be exaggerated or rendered poorly for the sake of clarity. DETAILED DESCRIPTION

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

[0050] The following detailed description is provided to help the reader obtain a thorough understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents in the methods, devices, and / or systems described herein will be apparent to those skilled in the art after understanding the present disclosure. For example, the order of the operations described herein is merely an example and is not limited to the order set forth herein, except where a particular order is necessary, and can be changed, which will be apparent to those skilled in the art after understanding the present disclosure. Also, descriptions of features that are well known in the art can be omitted for more clarity and conciseness.

[0051] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, these examples are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the methods, devices, and / or systems described herein to those skilled in the art after understanding the present disclosure. Accordingly, known methods, devices, and materials are described in terms of their functionality and effects, rather than specific details of their structure and implementation.

[0052] Throughout the specification, when an element such as a layer, region, or substrate is referred to as being "on", "connected to", or "coupled to" another element, it can be directly on, directly connected to, or directly coupled to the other element, or one or more other elements can be interposed therebetween. Conversely, when an element is referred to as being "directly on", "directly connected to", or "directly coupled to" another element, there are no other elements interposed therebetween.

[0053] As used herein, the phrase "and / or" includes any one of the associated listed items, as well as any combination of any two or more of the associated listed items; likewise, "at least one of" includes any one of the associated listed items, as well as any combination of any two or more of the associated listed items.

[0054] Although terms such as "first," "second," and "third" can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, terms mentioned in the examples can also be referred to as a second element, a second component, a second region, a second layer or a second section without departing from the teachings of the examples described herein.

[0055] Spatially relative terms such as "on", "upper", "lower", "below", "above", and the like can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Such spatially relative terms can be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as being "on" or "upper" other elements or features would then be oriented "below" or "lower" relative to the other element(s) or feature(s). Thus, the example term "on" can encompass both an orientation of above and below. The device can be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0056] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the present disclosure. Unless otherwise defined, articles "a," "one" and "the" are intended to mean one or more of the items. The terms "including," "containing," and "having" are inclusive and are intended to mean that there are one or more items in the process, method, article, composition or apparatus that are described by the following. The terms "including" and "including without limitation," "comprising," and "having," are inclusive and are intended to mean that there are one or more items in the process, method, article, composition or apparatus that are described by the following.

[0057] In describing the present disclosure, terminology will be used with the understanding that such terminology is for the purpose of describing various examples only and is not intended to be limiting of the present disclosure. Unless otherwise defined, the terms "one" and "a" are intended to mean one or more of the items recited. The terms "including," "comprising," and "having" are inclusive and are intended to mean that there are one or more items in the process, method, article, composition or apparatus that are described by the following.

[0058] Variations can occur in the shapes of the elements depicted in the figures due to differences in manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the precise shapes and configurations described in the examples, but rather, are inclusive of variations in shapes and configurations that would result in the same technical effects.

[0059] It should be noted that, in this document, the term "may" is used to mean that there is a possibility that a feature, an example, or an example can include or be implemented with such a feature, an example, or an example. Thus, such term "may" does not necessarily mean that such a feature, an example, or an example will exist or will be implemented in all examples.

[0060] The features of the examples described herein can be combined in various ways that will become apparent upon understanding this disclosure. Furthermore, although the examples described herein have multiple configurations, other configurations that will become apparent upon understanding this disclosure are also possible.

[0061] One aspect of this disclosure provides an optical imaging system capable of performing close-up or macro photography using a camera module with scalable characteristics.

[0062] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are merely illustrative. That is to say, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings.

[0063] In this specification, the first lens refers to the lens closest to the object (or target), while the sixth lens refers to the lens closest to the imaging plane (or image sensor). Furthermore, in this specification, the radius of curvature and thickness of the lens, TTL (distance from the object-side surface of the first lens to the imaging plane), IMG HT (height of the imaging plane), focal length, effective radius, etc., are all expressed in millimeters (mm), and the field of view (FOV) is expressed in degrees.

[0064] Furthermore, the lens thickness, the distance between lenses, and the TTL are distances measured based on the optical axes of the lenses. Additionally, in the description of lens shape, a convex surface means that the paraxial region of the corresponding surface is convex, and a concave surface means that the paraxial region of the corresponding surface is concave. Therefore, although one surface of the lens is described as convex, the edge portion of the lens may be concave. Similarly, although one surface of the lens is described as concave, the edge portion of the lens may be convex.

[0065] The optical imaging system described herein can be configured for installation in mobile electronic devices. For example, it can be installed in smartphones, laptops, augmented reality devices, virtual reality devices, portable game consoles, etc. However, the applications and examples of the optical imaging system described herein are not limited to the aforementioned electronic devices. For instance, it can be applied to small or mobile electronic devices that require high-resolution image capture but offer limited installation space.

[0066] The optical imaging system according to the first aspect of the present disclosure can include two lens groups. For example, the optical imaging system can include a first lens group having two or more lenses and a second lens group having two or more lenses. The first lens group and the second lens group can be sequentially disposed from the object side. In detail, the second lens group can be disposed on the image side (i.e., the rear side) of the first lens group.

[0067] The optical imaging system according to the first aspect of the present disclosure can further include an image sensor configured to convert an optical signal passing through the first lens group and the second lens group into an electrical signal.

[0068] The optical imaging system according to the first aspect can be configured such that the second lens group is movable in the direction of the optical axis. For example, if necessary, the second lens group can be configured to move in the direction in which it becomes farther from the first lens group (i.e., the direction of the imaging surface).

[0069] The optical imaging system according to the first aspect can implement macro photography by changing the position of the second lens group. As an example, the optical imaging system according to the first aspect can capture an image of an object located at a long distance or an intermediate distance in a state in which the second lens group is disposed closest to the first lens group, and can capture an image of an object at an ultra-close position in a state in which the second lens group is disposed farthest from the first lens group. In detail, the optical imaging system according to the first aspect can implement macro photography by moving the second lens group by a substantially insignificant distance (within 20% of TTL).

[0070] The optical imaging system according to the first aspect can include six lenses. For example, in the optical imaging system according to the first aspect, the sum of the number of lenses constituting the first lens group and the number of lenses constituting the second lens group can be 6. In detail, the first lens group can include a first lens, a second lens, and a third lens sequentially arranged from the object side, and the second lens group can include a fourth lens, a fifth lens, and a sixth lens sequentially arranged from the object side. However, each of the number of lenses constituting the first lens group and the number of lenses constituting the second lens group is not limited to three. For example, the first lens group can include a first lens, a second lens, a third lens, and a fourth lens sequentially arranged from the object side, and the second lens group can include a fifth lens and a sixth lens sequentially arranged from the object side.

[0071] In the optical imaging system according to the first aspect, the first lens group can include one or more lenses having a positive refractive power and one or more lenses having a negative refractive power. For example, the first lens, the second lens, and the third lens constituting the first lens group can sequentially have a positive refractive power, a negative refractive power, and a positive refractive power.

[0072] In the optical imaging system according to the first aspect, the second lens group may include two or more lenses having negative refractive power. For example, two or more of the fourth, fifth, and sixth lenses constituting the second lens group may have negative refractive power.

[0073] According to the first aspect, the optical imaging system can satisfy a predetermined conditional expression. For example, according to the first aspect, the optical imaging system can satisfy the following conditional expression with respect to the distance (TTL) from the object side of the first lens to the imaging plane and the focal length (f) of the optical imaging system.

[0074] 0.8 <TTL / f<1.2

[0075] The optical imaging system according to the first aspect may also include characteristics other than those described above. For example, the optical imaging system according to the first aspect may satisfy one or more of the following conditional expressions.

[0076] 0.7 < |fG1 / fG2| < 1.4

[0077] 0.7mm <Dm<3.0mm

[0078] 0.06 <Dm / TTL<0.20

[0079] 0.15 <Dm / BFL<0.60

[0080] 0.06 <Dm / f<0.20

[0081] 0.50 <fM / f<0.98

[0082] Here, fG1 is the focal length of the first lens group, fG2 is the focal length of the second lens group, Dm is the maximum variable distance of the second lens group, BFL is the distance from the image side of the last lens of the second lens group to the imaging plane, and fM is the focal length of the optical imaging system in the maximum variable state of the second lens group.

[0083] An optical imaging system according to a second aspect of this disclosure may include a plurality of lenses. For example, an 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.

[0084] The optical imaging system according to the second aspect of this disclosure may further include an image sensor configured to convert optical signals passed through the first to sixth lenses into electrical signals.

[0085] The optical imaging system according to the second aspect may include a lens with a specific shape. For example, the optical imaging system according to the second aspect may include a third lens that protrudes from its image side.

[0086] The optical imaging system according to the second aspect can satisfy certain conditional expressions. For example, the optical imaging system according to the second aspect can satisfy all of the following conditional expressions.

[0087] 0.8 < TTL / f < 1.2

[0088] 0.32 < f3 / f < 0.82

[0089] -1.0 < R1 / R4 < 1.0

[0090] Here, f3 is the focal length of the third lens, R1 is the radius of curvature of the object side surface of the first lens, and R4 is the radius of curvature of the image side surface of the second lens.

[0091] The optical imaging system according to the third aspect of the present disclosure can be configured to satisfy one or more of the following conditional expressions. As an example, the optical imaging system according to the third aspect can include six lenses, e.g., 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, and can satisfy two or more of the following conditional expressions. As another example, the optical imaging system according to the third aspect can include six lenses, e.g., 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, and can be configured to satisfy all of the following conditional expressions.

[0092] 4.0 < TTL / IMG HT < 7.0

[0093] 0.23 < BFL / f < 0.46

[0094] 0.50 < f1 / f < 1.20

[0095] -5.0 < f2 / f < 2.0

[0096] -2.0 < f3 / f < 1.0

[0097] 0.4 < f5 / f < 2.0

[0098] -1.2 < f6 / f < -0.20

[0099] -4.0 < (R1+R2) / (R1-R2) < -0.60

[0100] -8.0 < (R1+R4) / (R1-R4) < -0.10

[0101] Here, IMG HT is a height of an imaging plane, f1 is a focal length of the first lens, 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, f6 is a focal length of the sixth lens, and R2 is a radius of curvature of an image side surface of the first lens.

[0102] An optical imaging system according to the present disclosure can include one or more lenses having the following properties. As an example, the optical imaging system according to the first aspect can include one of the first to sixth lenses having the following properties. As another example, the optical imaging system according to the second and third aspects can include one or more of the first to sixth lenses having the following properties. However, the optical imaging system according to the above aspects does not necessarily include a lens having the following properties. The properties of the first to sixth lenses will be described below.

[0103] The first lens can have a refractive power. For example, the first lens can have a positive refractive power. One surface of the first lens can be convex. For example, the object side surface of the first lens can be convex. The first lens can have a spherical surface or an aspherical surface. As an example, both surfaces of the first lens can be aspherical. The first lens can be formed of a material having high light transmittance and excellent workability. For example, the first lens can be formed of plastic or glass. The first lens can have a predetermined refractive index. As an example, the refractive index of the first lens can be less than 1.6. As a specific example, the refractive index of the first lens can be greater than 1.50 and less than 1.60. The first lens can have a predetermined Abbe number. As an example, the Abbe number of the first lens can be 50 or greater. As a specific example, the Abbe number of the first lens can be greater than 50 and less than 60.

[0104] The second lens can have a refractive power. For example, the second lens can have a positive refractive power or a negative refractive power. One surface of the second lens can be concave. As an example, the object side surface of the second lens can be concave. As an example, the image side surface of the second lens can be concave. The second lens can have a spherical surface or an aspherical surface. As an example, both surfaces of the second lens can be aspherical. The second lens can be formed of a material having high light transmittance and excellent workability. For example, the second lens can be formed of plastic or glass. The second lens can have a predetermined refractive index. As an example, the refractive index of the second lens can be 1.5 or greater. As a specific example, the refractive index of the second lens can be greater than 1.50 and less than 1.70. The second lens can have a predetermined Abbe number. For example, the Abbe number of the second lens can be 20 or greater. As a specific example, the Abbe number of the second lens can be greater than 20 and less than 60.

[0105] The third lens can have a refractive power. For example, the third lens can have a positive refractive power. One surface of the third lens can be convex. For example, the image side surface of the third lens can be convex. The third lens can have a spherical surface or an aspherical surface. As an example, both surfaces of the third lens can be aspherical. The third lens can be formed of a material having high light transmittance and excellent workability. For example, the third lens can be formed of plastic or glass. The third lens can have a predetermined refractive index. As an example, the refractive index of the third lens can be 1.5 or more. As a specific example, the refractive index of the third lens can be greater than 1.50 and less than 1.60. The third lens can have a predetermined Abbe number. As an example, the Abbe number of the third lens can be 50 or more. As a specific example, the Abbe number of the third lens can be greater than 50 and less than 60.

[0106] The fourth lens can have a refractive power. For example, the fourth lens can have a positive refractive power or a negative refractive power. The fourth lens can have a spherical surface or an aspherical surface. As an example, both surfaces of the fourth lens can be aspherical. As another example, both surfaces of the fourth lens can be spherical. The fourth lens can be formed of a material having high light transmittance and excellent workability. For example, the fourth lens can be formed of plastic or glass. The fourth lens can have a predetermined refractive index. As an example, the refractive index of the fourth lens can be 1.5 or more. As a specific example, the refractive index of the fourth lens can be greater than 1.50 and less than 1.90. The fourth lens can have a predetermined Abbe number. As an example, the Abbe number of the fourth lens can be 15 or more. As a specific example, the Abbe number of the fourth lens can be greater than 15 and less than 40.

[0107] The fifth lens can have a refractive power. For example, the fifth lens can have a positive refractive power or a negative refractive power. One surface of the fifth lens can be convex. For example, the image side surface of the fifth lens can be convex. However, the image side surface of the fifth lens is not necessarily limited to be convex. The fifth lens can have a spherical surface or an aspherical surface. As an example, both surfaces of the fifth lens can be aspherical. The fifth lens can be formed of a material having high light transmittance and excellent workability. For example, the fifth lens can be formed of plastic or glass. The fifth lens can have a predetermined refractive index. As an example, the refractive index of the fifth lens can be 1.5 or more. As a specific example, the refractive index of the fifth lens can be greater than 1.50 and less than 1.70. The fifth lens can have a predetermined Abbe number. As an example, the Abbe number of the fifth lens can be 15 or more. As a specific example, the Abbe number of the fifth lens can be greater than 15 and less than 40.

[0108] The sixth lens can have a refractive power. For example, the sixth lens can have a positive refractive power. One surface of the sixth lens can be concave. As an example, the object side surface of the sixth lens can be concave. As an example, the image side surface of the sixth lens can be concave. The sixth lens can have a spherical surface or an aspherical surface. As an example, both surfaces of the sixth lens can be aspherical. The sixth lens can be formed of a material having high light transmittance and excellent workability. For example, the sixth lens can be formed of plastic or glass. The sixth lens can have a predetermined refractive index. As an example, the refractive index of the sixth lens can be 1.5 or more. As a specific example, the refractive index of the sixth lens can be greater than 1.50 and less than 1.70. The sixth lens can have a predetermined Abbe number. As an example, the Abbe number of the sixth lens can be 20 or more. As a specific example, the Abbe number of the sixth lens can be greater than 20 and less than 60.

[0109] As described above, the first lens to the sixth lens can have a spherical surface or an aspherical surface. When the first lens to the sixth lens have aspherical surfaces, the aspherical surfaces can be represented by the following Equation 1.

[0110] Equation 1

[0111]

[0112] Here, c is the reciprocal of the radius of curvature of the lens, k is a conic constant, r is the distance from a certain point on the aspherical surface of the lens to the optical axis, A to H and J are aspherical constants, and Z (or SAG) is the distance between a certain point on the aspherical surface of the lens at a distance r and a tangent plane intersecting the vertex of the aspherical surface of the lens.

[0113] The optical imaging system according to the above exemplary embodiment or the above aspect can further include a filter. For example, the optical imaging system can include a filter disposed between the sixth lens and the imaging plane. The filter can be configured to block light of a certain wavelength. For example, the filter can be configured to block infrared rays.

[0114] Next, an optical imaging system according to an exemplary embodiment will be described with reference to the accompanying drawings.

[0115] First, an optical imaging system according to a first exemplary embodiment will be described with reference to Figure 1

[0116] ​The optical imaging system 100 according to the first exemplary embodiment can include a first lens group LG1 and a second lens group LG2. The first lens group LG1 can include a first lens 110, a second lens 120, and a third lens 130, and the second lens group LG2 can include a fourth lens 140, a fifth lens 150, and a sixth lens 160. The first lens group LG1 can be configured such that its position with respect to an imaging plane IP does not change, but the second lens group LG2 can be configured such that its position with respect to the imaging plane IP can change. For example, in a state in which the second lens group LG2 is disposed close to the first lens group LG1, the second lens group LG2 can be moved toward the imaging plane IP side, which can enable close-up photography or macro photography by the optical imaging system 100.

[0117] The first lens 110 can have a positive refractive power, and its object side surface can be convex and its image side surface can be concave. The second lens 120 can have a negative refractive power, and its object side surface can be convex and its image side surface can be concave. The third lens 130 can have a positive refractive power, and its object side surface can be convex and its image side surface can be convex. The fourth lens 140 can have a negative refractive power, and its object side surface can be concave and its image side surface can be concave. The fifth lens 150 can have a positive refractive power, and its object side surface can be convex and its image side surface can be convex. The sixth lens 160 can have a negative refractive power, and its object side surface can be convex and its image side surface can be concave. A inflection point can be formed on the image side surface of the sixth lens 160.

[0118] The optical imaging system 100 can further include a filter IF and an imaging plane IP. The filter IF can be disposed between the sixth lens 160 and the imaging plane IP. The imaging plane IP can be formed at a position at which light incident by the first lens 110 to the sixth lens 160 forms an image. For example, the imaging plane IP can be formed on one surface of an image sensor IS of a camera module, or inside the image sensor IS.

[0119] A graph having a curve representing an aberration characteristic of an optical imaging system according to the present exemplary embodiment is shown in Figure 2 Tables 1 and 2 show characteristics of lenses and aspherical values of the optical imaging system according to the present exemplary embodiment.

[0120] Table 1

[0121] Surface No. Component Radius of curvature Thickness / distance Refractive index Abbe number Effective radius S1 First lens 4.6097 1.5696 1.535 55.7 2.5 S2 78.2262 0.0500 2.5 S3 Second lens 43.7180 1.0000 1.639 23.5 2.4 S4 6.2475 0.7867 2.3 S5 Third lens 30.8505 0.9188 1.535 55.7 2.3 S6 -8.8963 1.4000 2.2 S7 Fourth lens -18.4105 0.5000 1.567 37.4 2.0 S8 7.0082 0.1529 2.0 S9 Fifth lens 10.8843 0.7232 1.661 20.4 2.0 S10 -37.9948 1.2165 2.0 S11 Sixth lens 71.0270 0.7479 1.567 37.4 1.9 S12 9.2813 4.8975 2.1 S13 Filter Infinity 0.1100 1.517 64.2 3.0 S14 Infinity 2.2315 3.0 S15 Imaging surface Infinity -0.0087 3.5

[0122] Table 2

[0123]

[0124]

[0125] Reference will be made to Figure 3 An optical imaging system according to a second exemplary embodiment will be described.

[0126] An optical imaging system 200 according to the second exemplary embodiment can include a first lens group LG1 and a second lens group LG2. The first lens group LG1 can include a first lens 210, a second lens 220, a third lens 230, and a fourth lens 240, and the second lens group LG2 can include a fifth lens 250 and a sixth lens 260. The first lens group LG1 can be configured such that its position with respect to an imaging plane IP does not change, but the second lens group LG2 can be configured such that its position with respect to the imaging plane IP can change. For example, in a state in which the second lens group LG2 is disposed close to the first lens group LG1, the second lens group LG2 can be moved toward the imaging plane IP side, which can enable close-up photography or macro photography by the optical imaging system 200.

[0127] The first lens 210 can have a positive refractive power, and its object side surface can be convex and its image side surface can be concave. The second lens 220 can have a negative refractive power, and its object side surface can be concave and its image side surface can be convex. The third lens 230 can have a positive refractive power, and its object side surface can be convex and its image side surface can be convex. The fourth lens 240 can have a negative refractive power, and its object side surface can be concave and its image side surface can be convex. The fifth lens 250 can have a positive refractive power, and its object side surface can be concave and its image side surface can be convex. The sixth lens 260 can have a negative refractive power, and its object side surface can be concave and its image side surface can be concave.

[0128] The optical imaging system 200 can further include a filter IF and an imaging plane IP. The filter IF can be disposed between the sixth lens 260 and the imaging plane IP. The imaging plane IP can be formed at a position at which light incident by the first lens 210 through the sixth lens 260 forms an image. For example, the imaging plane IP can be formed on one surface of an image sensor IS of a camera module, or inside the image sensor IS.

[0129] A graph having curves representing aberration characteristics of an optical imaging system according to the present exemplary embodiment is shown in Figure 4 Tables 3 and 4 show characteristics of lenses and aspherical values of the optical imaging system according to the present exemplary embodiment.

[0130] Table 3

[0131] Surface No. Component Radius of curvature Thickness / distance Refractive index Abbe number Effective radius S1 First lens 4.2374 0.9686 1.535 55.7 1.8 S2 12.9695 0.8275 1.7 S3 Second lens -5.5467 1.5000 1.535 55.7 1.7 S4 -6.2484 0.4032 1.8 S5 Third lens 6.0019 0.6623 1.535 55.7 1.8 S6 -5.0664 0.1000 1.7 S7 Fourth lens -5.0564 1.3198 1.847 23.8 1.7 S8 -16.1505 0.5186 1.7 S9 Fifth lens -4.3212 1.0653 1.661 20.4 1.6 S10 -3.7149 0.7537 1.6 S11 Sixth lens -5.7610 1.3189 1.535 55.7 1.5 S12 6.6345 1.9842 1.6 S13 Filter Infinity 0.1100 1.517 64.2 1.9 S14 Infinity 1.7944 1.9 S15 Imaging surface Infinity 0.0037 2.1

[0132] Table 4

[0133]

[0134]

[0135] Reference will be made to Figure 5 An optical imaging system according to a third exemplary embodiment will be described.

[0136] The optical imaging system 300 according to the third exemplary embodiment can include a first lens group LG1 and a second lens group LG2. The first lens group LG1 can include a first lens 310, a second lens 320, a third lens 330, and a fourth lens 340, and the second lens group LG2 can include a fifth lens 350 and a sixth lens 360. The first lens group LG1 can be configured such that its position with respect to an imaging plane IP does not change, but the second lens group LG2 can be configured such that its position with respect to the imaging plane IP can change. For example, in a state in which the second lens group LG2 is disposed close to the first lens group LG1, the second lens group LG2 can be moved toward the imaging plane IP side, which can enable close-up photography or macro photography by the optical imaging system 300.

[0137] The first lens 310 can have a positive refractive power, and its object side surface can be convex and its image side surface can be concave. The second lens 320 can have a negative refractive power, and its object side surface can be convex and its image side surface can be concave. The third lens 330 can have a positive refractive power, and its object side surface can be convex and its image side surface can be convex. The fourth lens 340 can have a negative refractive power, and its object side surface can be concave and its image side surface can be convex. The fifth lens 350 can have a positive refractive power, and its object side surface can be concave and its image side surface can be convex. The sixth lens 360 can have a negative refractive power, and its object side surface can be concave and its image side surface can be concave. A inflection point can be formed on the image side surface of the sixth lens 360.

[0138] The optical imaging system 300 can further include a filter IF and an imaging plane IP. The filter IF can be disposed between the sixth lens 360 and the imaging plane IP. The imaging plane IP can be formed at a position at which light incident by the first lens 310 through the sixth lens 360 forms an image. For example, the imaging plane IP can be formed on one surface of an image sensor IS of a camera module, or formed within the image sensor IS.

[0139] A graph having curves representing aberration characteristics of an optical imaging system according to the present exemplary embodiment is shown in Figure 6 Tables 5 and 6 show characteristics of lenses and aspherical values of the optical imaging system according to the present exemplary embodiment.

[0140] Table 5

[0141] Surface No. Component Radius of curvature Thickness / distance Refractive index Abbe number Effective radius S1 First lens 4.5371 1.1532 1.535 55.7 2.0 S2 9.5091 0.5000 2.0 S3 Second lens 8.5486 0.5000 1.535 55.7 2.0 S4 6.8843 0.9298 2.0 S5 Third lens 8.3255 1.0764 1.535 55.7 2.0 S6 -4.8617 0.2000 1.9 S7 Fourth lens -5.0284 2.0000 1.847 23.8 1.9 S8 -11.6864 0.6313 2.0 S9 Fifth lens -5.8853 1.0000 1.661 20.4 1.9 S10 -5.1216 0.9362 1.9 S11 Sixth lens -5.3356 1.0000 1.535 55.7 1.8 S12 7.7336 4.3722 2.0 S13 Filter Infinity 0.1100 1.517 64.2 2.9 S14 Infinity 1.0906 2.9 S15 Imaging surface Infinity 0.0053 3.2

[0142] Table 6

[0143] Surface No. S1 S2 S3 S4 S5 k -7.78370E-01 -7.42316E+00 1.95804E+00 -2.10761E+00 1.32898E-01 A -7.41054E-04 -1.43943E-04 2.03459E-04 -5.40313E-04 -4.90757E-04 B -1.38728E-04 -7.60000E-05 1.51322E-04 -1.96347E-04 4.00000E-05 C -1.50000E-05 -1.10000E-05 1.30000E-05 -2.30000E-05 1.00000E-05 D -2.00000E-06 -1.00000E-06 2.77363E-07 -1.00000E-06 1.00000E-06 E -1.20325E-07 -1.01525E-07 -9.87924E-08 -1.06934E-07 8.69400E-08 F -7.04244E-09 -1.86514E-08 -1.44763E-08 2.13027E-10 -4.38301E-09 G -4.68407E-11 -2.43620E-09 -1.54399E-09 9.59884E-10 1.18336E-10 H 1.14739E-11 -1.01266E-11 -2.46430E-10 8.65875E-11 2.16965E-10 J -1.35278E-11 4.16332E-11 -6.49894E-11 -9.86239E-11 3.67232E-10 Surface No. S6 S9 S10 S11 S12 k -2.04301E+00 -1.96111E+01 -1.27127E+01 4.41264E+00 -1.50746E+01 A 7.89561E-04 3.87679E-03 3.03797E-03 -1.61124E-02 -1.86544E-02 B 2.70949E-04 5.80000E-05 -7.51293E-04 -8.77713E-04 2.53006E-03 C 4.40000E-05 -3.70000E-05 -9.60000E-05 3.04283E-04 -1.55907E-04 D 3.00000E-06 -4.00000E-06 1.60000E-05 1.80000E-05 -2.74488E-06 E -2.74872E-08 3.24882E-07 4.00000E-06 4.00000E-06 1.96635E-06 F 2.22966E-08 3.55549E-07 1.36732E-07 2.00000E-06 2.18286E-07 G 6.03234E-09 7.66030E-08 -6.58587E-08 3.41403E-07 4.53269E-09 H 2.24336E-09 7.14866E-09 -5.51034E-09 7.12623E-09 -2.28886E-09 J 5.25135E-10 -2.67024E-09 7.18658E-09 -1.91112E-08 -7.06925E-10

[0144] An optical imaging system according to a fourth exemplary embodiment will be described with reference to Figure 7 An optical imaging system according to a fourth exemplary embodiment will be described with reference to

[0145] An optical imaging system 400 according to the fourth exemplary embodiment can include a first lens group LG1 and a second lens group LG2. The first lens group LG1 can include a first lens 410, a second lens 420, and a third lens 430, and the second lens group LG2 can include a fourth lens 440, a fifth lens 450, and a sixth lens 460. The first lens group LG1 can be configured such that its position with respect to an imaging plane IP does not change, but the second lens group LG2 can be configured such that its position with respect to the imaging plane IP can change. For example, in a state in which the second lens group LG2 is disposed close to the first lens group LG1, the second lens group LG2 can be moved toward the imaging plane IP side, which can enable close-up photography or macro photography by the optical imaging system 400.

[0146] The first lens 410 can have a positive refractive power, and its object side surface can be convex and its image side surface can be convex. The second lens 420 can have a negative refractive power, and its object side surface can be concave and its image side surface can be concave. The third lens 430 can have a positive refractive power, and its object side surface can be convex and its image side surface can be convex. The fourth lens 440 can have a positive refractive power, and its object side surface can be convex and its image side surface can be convex. The fifth lens 450 can have a negative refractive power, and its object side surface can be concave and its image side surface can be concave. The sixth lens 460 can have a negative refractive power, and its object side surface can be concave and its image side surface can be convex.

[0147] The optical imaging system 400 can further include a filter IF and an imaging plane IP. The filter IF can be disposed between the sixth lens 460 and the imaging plane IP. The imaging plane IP can be formed at a position at which light incident by the first lens 410 through the sixth lens 460 forms an image. For example, the imaging plane IP can be formed on one surface of an image sensor IS of a camera module, or inside the image sensor IS.

[0148] A graph having curves representing aberration characteristics of an optical imaging system according to the present exemplary embodiment is shown in Figure 8 Tables 7 and 8 show characteristics of lenses and aspherical values of the optical imaging system according to the present exemplary embodiment.

[0149] Table 7

[0150]

[0151]

[0152] Table 8

[0153] Surface No. S1 S2 S3 S4 S5 S6 k -3.11521E-01 0.00000E+00 -9.90000E+01 1.79769E+00 0.00000E+00 -7.41882E-01 A -6.77991E-04 5.27692E-04 2.68057E-04 -8.22489E-04 5.30000E-05 5.77817E-04 B -8.40000E-05 -1.60000E-05 1.30000E-05 -1.86399E-04 4.50000E-05 1.33372E-04 C -4.00000E-06 -1.00000E-05 4.00000E-06 -3.30000E-05 1.50000E-05 2.40000E-05 D -1.00000E-06 -1.00000E-06 8.70178E-08 -2.00000E-06 1.00000E-06 4.00000E-06 E -1.34152E-07 -1.73790E-07 1.67950E-08 2.41106E-07 -1.68650E-07 1.00000E-06 F -1.28377E-08 -2.28071E-08 -8.56035E-09 9.69663E-08 -1.07104E-07 -1.33081E-07 G 4.56556E-10 -2.00434E-09 -4.61763E-09 2.91500E-08 -1.28501E-08 -4.56002E-08 H 5.57648E-10 6.03004E-10 -5.60670E-10 3.05219E-09 9.37681E-09 -8.14018E-10 J -1.17662E-12 7.64694E-10 6.75540E-10 -4.86986E-09 1.14398E-08 1.45778E-08 Surface No. S7 S8 S9 S10 S11 S12 k 0.00000E+00 0.00000E+00 1.18607E+00 -9.90000E+01 5.70096E+00 0.00000E+00 A 3.51289E-03 -2.45487E-03 2.52600E-04 -1.34585E-03 -6.48130E-03 -7.24755E-03 B 2.81163E-04 -3.60414E-04 6.30000E-05 -1.84871E-03 -1.76403E-03 -5.53805E-04 C -1.70868E-04 -1.51030E-04 1.12414E-04 -3.61649E-04 -3.86104E-04 8.16463E-05 D -1.40000E-05 9.00000E-05 5.89574E-04 -3.00000E-06 -1.09570E-04 -1.08527E-04 E 6.00000E-06 2.10000E-05 -2.90000E-05 -3.50000E-05 1.80000E-05 4.64652E-05 F -1.00000E-06 3.70000E-05 -6.00000E-06 3.00000E-06 9.00000E-06 2.53930E-07 G 6.00000E-06 7.00000E-06 1.10000E-05 1.00000E-06 -6.00000E-06 -1.55579E-06 H -2.08084E-07 -2.00000E-06 5.00000E-06 -1.00000E-06 -2.00000E-06 -5.59015E-07 J -1.00000E-06 -1.00000E-06 -2.00000E-06 -2.00000E-06 1.00000E-06 1.72537E-07

[0154] An optical imaging system according to a fifth exemplary embodiment will be described with reference to Figure 9 An optical imaging system according to a fifth exemplary embodiment will be described with reference to

[0155] An optical imaging system 500 according to the fifth exemplary embodiment can include a first lens group LG1 and a second lens group LG2. The first lens group LG1 can include a first lens 510, a second lens 520, a third lens 530, and a fourth lens 540, and the second lens group LG2 can include a fifth lens 550 and a sixth lens 560. The first lens group LG1 can be configured such that its position with respect to an imaging plane IP does not change, but the second lens group LG2 can be configured such that its position with respect to the imaging plane IP can change. For example, in a state in which the second lens group LG2 is disposed close to the first lens group LG1, the second lens group LG2 can be moved toward the imaging plane IP side, which can enable close-up photography or macro photography by the optical imaging system 500.

[0156] The first lens 510 can have a positive refractive power, and its object side surface can be convex and its image side surface can be concave. The second lens 520 can have a positive refractive power, and its object side surface can be convex and its image side surface can be concave. The third lens 530 can have a positive refractive power, and its object side surface can be convex and its image side surface can be convex. The fourth lens 540 can have a negative refractive power, and its object side surface can be concave and its image side surface can be concave. The fifth lens 550 can have a positive refractive power, and its object side surface can be convex and its image side surface can be concave. The sixth lens 560 can have a positive refractive power, and its object side surface can be convex and its image side surface can be concave.

[0157] The optical imaging system 500 can further include a filter IF and an imaging plane IP. The filter IF can be disposed between the sixth lens 560 and the imaging plane IP. The imaging plane IP can be formed at a position at which light incident by the first lens 510 to the sixth lens 560 forms an image. For example, the imaging plane IP can be formed on one surface of an image sensor IS of a camera module, or inside the image sensor IS.

[0158] In Figure 10The graphs having curves representing aberration characteristics of optical imaging systems according to the present exemplary embodiments are shown in FIGS. 6A and 6B. Tables 1 and 2 show the characteristics and aspherical values of lenses of optical imaging systems according to the present exemplary embodiments.

[0159] Table 1

[0160]

[0161]

[0162] Table 2

[0163] Surface No. S1 S2 S3 S4 S5 S6 k -2.41363E-02 2.17275E-01 -2.40385E+00 -3.44309E+00 4.52972E-01 -1.34209E-01 A 1.61007E-04 6.80000E-05 -1.04574E-04 -2.48709E-04 -8.10000E-05 1.03764E-03 B -1.11236E-04 -3.60000E-05 8.00000E-05 -1.80565E-04 -2.45949E-04 8.59886E-04 C -9.00000E-06 -4.30000E-05 5.70000E-05 -9.60000E-05 -7.80000E-05 2.57213E-04 D -1.10000E-05 3.00000E-06 7.00000E-06 -1.30000E-05 -1.70000E-05 2.30000E-05 E 7.03485E-08 1.14430E-07 -1.91313E-07 1.00000E-06 -4.47129E-07 -7.00000E-06 F 1.22724E-08 6.59404E-09 1.65789E-09 6.39245E-08 7.43724E-08 -3.00000E-06 G -1.47646E-09 -6.81024E-10 9.05581E-09 1.00966E-08 -2.03450E-08 -1.00000E-06 H 0.00000E+00 0.00000E+00 3.09321E-09 9.16931E-09 -4.90123E-08 -2.54852E-07 J 0.00000E+00 0.00000E+00 0.00000E+00 6.94183E-09 -3.50081E-08 -8.51933E-08 Surface No. S7 S8 S9 S10 S11 S12 k -2.50018E-01 7.49777E+00 1.25204E+01 9.90000E+01 -2.02912E+00 -8.33433E-01 A 7.72543E-04 6.11142E-04 -3.18624E-03 -3.92654E-03 7.05886E-03 8.36320E-03 B -1.04821E-04 -1.64899E-03 -4.64782E-04 2.80000E-05 5.11971E-04 5.60648E-04 C 2.00000E-05 -5.09402E-04 -5.00000E-06 -9.00000E-06 1.60795E-04 1.64522E-04 D 2.90000E-05 -1.50000E-05 4.00000E-06 1.60168E-07 -3.00000E-05 4.07983E-05 E -1.70000E-05 -1.80000E-05 2.00000E-06 1.00000E-06 -4.99382E-07 8.73278E-06 F -1.00000E-06 4.00000E-06 2.61276E-07 1.64289E-07 2.00000E-06 -1.46435E-06 G 5.55648E-09 1.00000E-06 -3.62716E-08 2.15688E-08 -2.17690E-07 -5.44712E-07 H 2.52742E-07 1.00000E-06 -3.32058E-08 -8.38672E-09 -3.08058E-09 -6.86539E-08 J 2.87657E-07 2.00000E-06 -1.27029E-08 -8.98591E-09 -8.50459E-10 3.30339E-08

[0164] An optical imaging system according to a sixth exemplary embodiment will be described with reference to FIGS. 6A and 6B. Figure 11 An optical imaging system according to a sixth exemplary embodiment will be described with reference to FIGS. 6A and 6B.

[0165] The optical imaging system 600 according to the sixth exemplary embodiment can include a first lens group LG1 and a second lens group LG2. The first lens group LG1 can include a first lens 610, a second lens 620, and a third lens 630, and the second lens group LG2 can include a fourth lens 640, a fifth lens 650, and a sixth lens 660. The first lens group LG1 can be configured such that its position with respect to an imaging plane IP does not change, but the second lens group LG2 can be configured such that its position with respect to the imaging plane IP can change. For example, in a state in which the second lens group LG2 is disposed close to the first lens group LG1, the second lens group LG2 can be moved toward the imaging plane IP side, which can enable close-up photography or macro photography by the optical imaging system 600.

[0166] The first lens 610 can have a positive refractive power, and its object side surface can be convex and its image side surface can be concave. The second lens 620 can have a negative refractive power, and its object side surface can be concave and its image side surface can be convex. The third lens 630 can have a positive refractive power, and its object side surface can be concave and its image side surface can be convex. The fourth lens 640 can have a negative refractive power, and its object side surface can be convex and its image side surface can be concave. The fifth lens 650 can have a positive refractive power, and its object side surface can be convex and its image side surface can be convex. The sixth lens 660 can have a negative refractive power, and its object side surface can be concave and its image side surface can be concave. A reverse curve point can be formed on the image side surface of the sixth lens 660.

[0167] The optical imaging system 600 can further include an optical filter IF and an imaging plane IP. The optical filter IF can be disposed between the sixth lens 660 and the imaging plane IP. The imaging plane IP can be formed at a position at which light incident by the first lens 610 to the sixth lens 660 forms an image. For example, the imaging plane IP can be formed on one surface of an image sensor IS of a camera module, or inside the image sensor IS.

[0168] In Figure 12 A graph having curves representing aberration characteristics of an optical imaging system according to the present exemplary embodiment is shown in FIG. 11. Tables 11 and 12 show characteristics of lenses and aspherical values of the optical imaging system according to the present exemplary embodiment.

[0169] Table 11

[0170]

[0171] Table 12

[0172]

[0173]

[0174] An optical imaging system according to a seventh exemplary embodiment will be described with reference to FIG. 12. Figure 13 An optical imaging system according to a seventh exemplary embodiment will be described with reference to FIG. 12.

[0175] The optical imaging system 700 according to the seventh exemplary embodiment can include a first lens group LG1 and a second lens group LG2. The first lens group LG1 can include a first lens 710, a second lens 720, a third lens 730, and a fourth lens 740, and the second lens group LG2 can include a fifth lens 750 and a sixth lens 760. The first lens group LG1 can be configured such that its position with respect to an imaging plane IP does not change, but the second lens group LG2 can be configured such that its position with respect to the imaging plane IP can change. For example, in a state in which the second lens group LG2 is disposed close to the first lens group LG1, the second lens group LG2 can be moved toward the imaging plane IP side, which can enable close-up photography or macro photography by the optical imaging system 700.

[0176] The first lens 710 can have a positive refractive power, and its object side surface can be convex and its image side surface can be concave. The second lens 720 can have a negative refractive power, and its object side surface can be convex and its image side surface can be concave. The third lens 730 can have a positive refractive power, and its object side surface can be convex and its image side surface can be convex. The fourth lens 740 can have a negative refractive power, and its object side surface can be concave and its image side surface can be convex. The fifth lens 750 can have a positive refractive power, and its object side surface can be concave and its image side surface can be convex. The sixth lens 760 can have a negative refractive power, and its object side surface can be concave and its image side surface can be concave. A inflection point can be formed on the image side surface of the sixth lens 760.

[0177] The optical imaging system 700 can further include a filter IF and an imaging plane IP. The filter IF can be disposed between the sixth lens 760 and the imaging plane IP. The imaging plane IP can be formed at a position at which light incident by the first lens 710 to the sixth lens 760 forms an image. For example, the imaging plane IP can be formed on one surface of an image sensor IS of a camera module, or inside the image sensor IS.

[0178] A graph having curves representing aberration characteristics of an optical imaging system according to a ninth exemplary embodiment is shown in Figure 14 Tables 15 and 16 show characteristics of lenses and aspherical values of an optical imaging system according to the ninth exemplary embodiment.

[0179] Table 15

[0180] Surface No. Component Radius of curvature Thickness / distance Refractive index Abbe number Effective radius S1 First lens 4.3728 0.8516 1.537 55.7 1.8 S2 11.9749 1.0766 1.7 S3 Second lens 11.2614 0.7576 1.537 55.7 1.8 S4 10.7421 0.5483 1.7 S5 Third lens 30.0770 0.8960 1.537 55.7 1.7 S6 -3.2180 0.1000 1.7 S7 Fourth lens -3.0090 0.8653 1.679 19.2 1.7 S8 -5.1152 0.4741 1.8 S9 Fifth lens -3.8904 1.0000 1.668 20.4 1.6 S10 -3.3166 0.8466 1.6 S11 Sixth lens -4.3576 0.8000 1.537 55.7 1.4 S12 9.3111 1.8991 1.6 S13 Filter Infinity 0.1100 1.517 64.2 1.8 S14 Infinity 2.1648 1.8 S15 Imaging surface Infinity 0.0038 2.0

[0181] Table 16

[0182]

[0183]

[0184] An optical imaging system according to an eighth exemplary embodiment will be described with reference to Figure 15 An optical imaging system according to a ninth exemplary embodiment will be described.

[0185] The optical imaging system 800 according to the eighth exemplary embodiment may include a first lens group LG1 and a second lens group LG2. The first lens group LG1 may include a first lens 810, a second lens 820, and a third lens 830, and the second lens group LG2 may include a fourth lens 840, a fifth lens 850, and a sixth lens 860. The first lens group LG1 may be configured such that its position relative to the imaging surface IP remains unchanged, but the second lens group LG2 may be configured such that its position relative to the imaging surface IP can be changed. For example, when the second lens group LG2 is positioned close to the first lens group LG1, the second lens group LG2 may move toward the imaging surface IP, which can enable close-up or macro photography by the optical imaging system 800.

[0186] The first lens 810 can have positive refractive power, and its object-side surface can be convex while its image-side surface can be concave. The second lens 820 can have negative refractive power, and its object-side surface can be convex while its image-side surface can be concave. The third lens 830 can have positive refractive power, and its object-side surface can be concave while its image-side surface can be convex. The fourth lens 840 can have negative refractive power, and its object-side surface can be convex while its image-side surface can be concave. The fifth lens 850 can have positive refractive power, and its object-side surface can be convex while its image-side surface can be convex. The sixth lens 860 can have negative refractive power, and its object-side surface can be concave while its image-side surface can be concave. A curvature point can be formed on the image-side surface of the sixth lens 860.

[0187] The optical imaging system 800 may also include a filter IF and an imaging surface IP. The filter IF may be disposed between the sixth lens 860 and the imaging surface IP. The imaging surface IP may be formed at the location where the light incident from the first lens 810 to the sixth lens 860 forms an image. For example, the imaging surface IP may be formed on a surface of the image sensor IS of the camera module, or it may be formed within the image sensor IS.

[0188] exist Figure 16 The diagram shows graphs with curves representing the aberration characteristics of the optical imaging system according to this exemplary embodiment. Tables 15 and 16 show the characteristics of the lens and aspherical values ​​of the optical imaging system according to this exemplary embodiment.

[0189] Table 15

[0190] Surface No. Component Radius of curvature Thickness / distance Refractive index Abbe number Effective radius S1 First lens 3.4813 1.0479 1.537 55.7 1.8 S2 657.7948 0.2013 1.7 S3 Second lens 61.6440 0.4788 1.644 23.5 1.6 S4 4.7452 0.5849 1.5 S5 Third lens -38.7793 0.5967 1.537 55.7 1.5 S6 -4.7656 0.9649 1.5 S7 Fourth lens 9.2973 0.4562 1.570 37.4 1.4 S8 2.7171 0.2000 1.4 S9 Fifth lens 5.3278 1.0000 1.667 20.4 1.4 S10 -16.3339 0.3091 1.5 S11 Sixth lens -12.0600 0.6000 1.644 23.5 1.5 S12 9.2686 2.6865 1.6 S13 Filter Infinity 0.1100 1.517 64.2 2.5 S14 Infinity 2.6814 2.5 S15 Imaging surface Infinity -0.0072 3.5

[0191] Table 16

[0192]

[0193]

[0194] Reference Figure 17 An optical imaging system according to a ninth exemplary embodiment is described.

[0195] The optical imaging system 900 according to the ninth exemplary embodiment may include a first lens group LG1 and a second lens group LG2. The first lens group LG1 may include a first lens 910, a second lens 920, a third lens 930, and a fourth lens 940, and the second lens group LG2 may include a fifth lens 950 and a sixth lens 960. The first lens group LG1 may be configured such that its position relative to the imaging surface IP remains unchanged, but the second lens group LG2 may be configured such that its position relative to the imaging surface IP can be changed. For example, when the second lens group LG2 is positioned close to the first lens group LG1, the second lens group LG2 may move toward the imaging surface IP, which can enable close-up or macro photography by the optical imaging system 900.

[0196] The first lens 910 can have positive refractive power, and its object-side surface can be convex while its image-side surface can be concave. The second lens 920 can have positive refractive power, and both its object-side surface and image-side surface can be convex. The third lens 930 can have positive refractive power, and both its object-side surface and image-side surface can be concave. The fourth lens 940 can have negative refractive power, and both its object-side surface and image-side surface can be concave. The fifth lens 950 can have positive refractive power, and both its object-side surface and image-side surface can be convex. The sixth lens 960 can have negative refractive power, and both its object-side surface and image-side surface can be concave. A curvature point can be formed on the image-side surface of the sixth lens 960.

[0197] The optical imaging system 900 may also include a filter IF and an imaging surface IP. The filter IF may be disposed between the sixth lens 960 and the imaging surface IP. The imaging surface IP may be formed at the location where the light incident from the first lens 910 to the sixth lens 960 forms an image. For example, the imaging surface IP may be formed on a surface of the image sensor IS of the camera module, or it may be formed within the image sensor IS.

[0198] exist Figure 18 The diagram shows graphs with curves representing the aberration characteristics of the optical imaging system according to this exemplary embodiment. Tables 17 and 18 show the characteristics of the lens and aspherical values ​​of the optical imaging system according to this exemplary embodiment.

[0199] Table 17

[0200] Surface No. Component Radius of curvature Thickness / distance Refractive index Abbe number Effective radius S1 First lens 3.9083 0.8516 1.537 55.7 1.8 S2 7.5795 0.2983 1.7 S3 Second lens 27.7789 0.7576 1.537 55.7 1.7 S4 -14.7031 0.1098 1.6 S5 Third lens -16.0297 0.8960 1.537 55.7 1.6 S6 -3.8036 0.1159 1.6 S7 Fourth lens -4.4729 0.8653 1.679 19.2 1.6 S8 -9.9675 0.9981 1.5 S9 Fifth lens 21.3421 1.0000 1.668 20.4 1.3 S10 -31.4741 0.3177 1.2 S11 Sixth lens -3.7703 0.8000 1.537 55.7 1.2 S12 11.3670 2.7242 1.5 S13 Filter Infinity 0.1100 1.517 64.2 1.8 S14 Infinity 1.7627 1.8 S15 Imaging surface Infinity 0.0024 2.1

[0201] Table 18

[0202]

[0203]

[0204] The optical imaging systems 100, 200, 300, 400, 500, 600, 700, 800, and 900 according to the first through ninth exemplary embodiments described above can be configured to be easily mounted in a thin electronic device. For example, the optical imaging systems 100, 200, 300, 400, 500, 600, 700, 800, and 900 can include one or more path converting units PR for converting an optical path so as to be disposed in a length direction of a thin electronic device. As shown in FIGS. 1, 2, 3, 4, 5, 6, 7, 8, and 9, the path converting units PR can be disposed on the object side of the first lens group LG1. However, the position of the path converting units PR is not limited to the object side of the first lens group LG1. For example, the path converting units PR can also be disposed between the first lens group LG1 and the second lens group LG2, or after the second lens group LG2. Figure 19

[0205] Tables 19 and 20 show values of optical characteristic values and conditional expressions of the optical imaging systems according to the first through ninth exemplary embodiments.

[0206] Table 19

[0207]

[0208]

[0209] Table 20

[0210]

[0211]

[0212] As described above, the optical imaging system according to the exemplary embodiments of the present disclosure can capture images of objects located at a long distance or an intermediate distance and objects located at an ultra close distance.

[0213] ​While specific examples have been shown and described, it will be apparent to those skilled in the art, upon understanding the disclosure, that various changes in form and details can be made without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be understood as being descriptive in nature and not as being limiting in purpose. Descriptions of features or aspects in each example are to be considered as applicable to similar features or aspects in other examples. Proper results can 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 or substituted, or are supplemented, with other components or their equivalents. Therefore, the scope of the disclosure is not defined by the specific embodiments discussed, but rather by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are to be construed as being included in the disclosure.

Claims

1. An optical imaging system, comprising: A first lens group, including two or more lenses; A second lens group, including two or more lenses; And An image sensor configured to convert an optical signal passing through the first lens group and the second lens group into an electrical signal, Wherein, the first lens group and the second lens group are arranged in sequence from the object side, Wherein, the second lens group is configured to be movable in the optical axis direction, Wherein, 0.8 < TTL / f < 1.2 and 0.23 < BFL / f < 0.46, wherein, TTL is the distance from the object side surface of the foremost lens of the first lens group to the imaging surface, f is the focal length of the optical imaging system, and BFL is the distance from the image side surface of the last lens of the second lens group to the imaging surface, and Wherein, the optical imaging system has a total of six lenses.

2. The optical imaging system according to claim 1, wherein, 0.7 < |fG1 / fG2| < 1.4, wherein, fG1 is the focal length of the first lens group, and fG2 is the focal length of the second lens group.

3. The optical imaging system according to claim 1, wherein, The first lens group includes a first lens, a second lens, and a third lens arranged in sequence from the object side.

4. The optical imaging system according to claim 3, wherein, The first lens has a positive refractive power, Wherein, the second lens has a negative refractive power, and Wherein, the third lens has a positive refractive power.

5. The optical imaging system according to claim 3, wherein, 0.32 < f3 / f < 0.82, wherein, f3 is the focal length of the third lens.

6. The optical imaging system according to claim 3, wherein, The image side surface of the third lens is convex.

7. The optical imaging system according to claim 3, wherein, The second lens group includes a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side.

8. The optical imaging system according to claim 7, wherein, Two of the fourth lens to the sixth lens have a negative refractive power.

9. The optical imaging system according to claim 1, wherein, 4.0 < TTL / IMG HT < 7.0, wherein, IMG HT is the height of the imaging surface.

10. The optical imaging system according to claim 1, wherein, The first lens group includes the first lens to the fourth lens, and the second lens group includes the fifth lens and the sixth lens.

11. The optical imaging system according to claim 1, wherein, 0.32 < f3 / f < 0.82 and -1.0 < R1 / R4 < 1.0, wherein, f3 is the focal length of the third lens, R1 is the radius of curvature of the object side surface of the first lens, and R4 is the radius of curvature of the image side surface of the second lens.

12. An optical imaging system, comprising: A first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side, Wherein, the image side surface of the third lens is convex, Wherein, 0.8 < TTL / f < 1.2, 0.32 < f3 / f < 0.82, -1.0 < R1 / R4 < 1.0 and 0.23 < BFL / f < 0.46, wherein, TTL is the distance from the object side surface of the first lens to the imaging surface, f is the focal length of the optical imaging system, f3 is the focal length of the third lens, R1 is the radius of curvature of the object side surface of the first lens, R4 is the radius of curvature of the image side surface of the second lens, and BFL is the distance from the image side surface of the sixth lens to the imaging surface, The optical imaging system further includes an image sensor configured to convert optical signals passing through the first lens to the sixth lens into electrical signals. The optical imaging system has a total of six lenses.

13. The optical imaging system according to claim 12, wherein, The image-side surface of the second lens is concave.

14. The optical imaging system according to claim 12, wherein, The image-side surface of the fifth lens is convex.

15. The optical imaging system according to claim 12, wherein, The object-side surface of the sixth lens is concave.

16. The optical imaging system according to claim 12, wherein, The fourth lens has positive refractive power.

17. The optical imaging system according to claim 12, wherein, The fifth lens has negative refractive power.

Images