Optical system

Abstract

The optical system includes: a first lens group including at least one lens; and a second lens group including at least one lens, where the first lens group and the second lens group are disposed in order from an object side to an image side, where each of the first lens group and the second lens group is configured to move in an optical axis direction to vary magnification between a wide-angle end and a telephoto end, and where G1F is a focal length of the first lens group, and G1F is a focal length of the second lens group. G2F is a focal length of the second lens group, and a value of G1F / G2F is between 0.5 and 1.

Description

[0001] Cross - reference to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10 - 2021 - 0117218, filed on September 2, 2021, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. Technical field

[0003] Exemplary embodiments of the present disclosure relate to an optical system, and more particularly, to a zoom optical system. Background art

[0004] Multiple cameras may be mounted in a mobile device. In order to provide images at various magnifications, a general mobile device may include a wide - angle camera with a short focal length and a telephoto camera with a long focal length. As a result, the area occupied by the cameras may increase, and the associated cost may also increase.

[0005] The above information is presented only as background information to facilitate understanding of 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 present Summary is provided to introduce a selection of inventive concepts in a brief form, which will be further described in the Detailed Description section below. The present Summary 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 system includes: a first lens group including at least one lens; and a second lens group including at least one lens, wherein the first lens group and the second lens group are arranged in sequence from the object side to the image side, wherein each of the first lens group and the second lens group is configured to move in the optical axis direction to change the magnification between a wide - angle end and a telephoto end, and wherein G1F is the focal length of the first lens group, G2F is the focal length of the second lens group, and the value of |G1F / G2F| is between 0.5 and 1.

[0008] The first lens group may have a positive refractive power, and the second lens group may have a negative refractive power.

[0009] The total number of lenses included in the first lens group and the second lens group may be six, seven, or eight.

[0010] The first lens group may include four or more lenses having refractive power, and the second lens group may include two or more lenses having refractive power.

[0011] At least one of the object side and the image side of at least one lens of the first lens group and at least one lens of the second lens group may be aspherical.

[0012] G1_OAL is the distance between the object side vertex of the lens closest to the object side among at least one lens included in the first lens group and the image side vertex of the lens closest to the image side among at least one lens included in the first lens group, and G1_OAL may be less than 10 mm.

[0013] The first lens group may include a first lens, a second lens, and a third lens arranged in order from the object side to the image side, and 1x_f is the focal length of the optical system at the wide-angle end, f3 is the focal length of the third lens, and the value of |1x_f / f3| may be between 1 and 2.

[0014] The first lens group may include a first lens, a second lens, and a third lens arranged in order from the object side to the image side, and 2x_f is the focal length of the optical system at the telephoto end, f3 is the focal length of the third lens, and the value of |2x_f / f3| may be between 2 and 3.8.

[0015] 1xL is the distance from the object side surface of the lens closest to the object side among at least one lens of the first lens group to the imaging surface at the wide-angle end, 2xL is the distance from the object side surface of the lens closest to the object side to the imaging surface at the telephoto end, and 1xL / 2xL may be greater than 0.7.

[0016] 1xB is the distance from the image side vertex of the lens closest to the image side among at least one lens of the second lens group to the imaging surface at the wide-angle end, 2xB is the distance from the image side vertex of the lens closest to the image side to the imaging surface at the telephoto end, and 1xB / 2xB may be greater than 0.1.

[0017] At least one of the object side and the image side of at least one lens of the first lens group and at least one lens of the second lens group may include at least one inflection point.

[0018] The first lens group may include a first lens with positive refractive power, a second lens with refractive power, a third lens with refractive power, a fourth lens with refractive power, and a fifth lens with refractive power arranged in order from the object side to the image side.

[0019] The second lens group may include a sixth lens with refractive power and a seventh lens with positive refractive power arranged in order from the object side to the image side.

[0020] The optical system may further include a diaphragm disposed between the first lens group and the second lens group.

[0021] In another general aspect, an optical system includes: a first lens group including a first lens, a second lens, a third lens, a fourth lens, and a fifth lens each having a refractive power; and a second lens group including a sixth lens having a refractive power and a seventh lens having a negative refractive power, wherein the first lens to the seventh lens are arranged in sequence from the object side, wherein each of the first lens group and the second lens group is configured to move in the optical axis direction to change the magnification between the wide-angle end and the telephoto end, and wherein 1xL is the distance from the object side surface of the first lens to the imaging surface at the wide-angle end, 2xL is the distance from the object side surface of the first lens to the imaging surface at the telephoto end, and 1xL / 2xL is greater than 0.7.

[0022] G1F is the focal length of the first lens group, G2F is the focal length of the second lens group, and the value of |G1F / G2F| can be between 0.5 and 1.

[0023] The first lens may have a negative refractive power.

[0024] In another general aspect, an optical system includes: a first lens group including a first lens, a second lens, a third lens, and a fourth lens each having a refractive power; and a second lens group including a fifth lens and a sixth lens each having a refractive power, wherein the first lens to the sixth lens are arranged in sequence from the object side, wherein each of the first lens group and the second lens group is configured to move in the optical axis direction to change the magnification between the wide-angle end and the telephoto end, wherein 1x_f is the focal length of the optical system at the wide-angle end, f3 is the focal length of the third lens, and the value of |1x_f / f3| is between 1 and 2, and wherein the total number of lenses included in the first lens group and the second lens group is six.

[0025] In another general aspect, an optical system includes: a first lens group including a first lens, a second lens, a third lens, a fourth lens, and a fifth lens each having a refractive power; and a second lens group including a sixth lens having a refractive power, a seventh lens having a positive refractive power, and an eighth lens having a refractive power, wherein the first lens to the eighth lens are arranged in sequence from the object side, wherein each of the first lens group and the second lens group is configured to move in the optical axis direction to change the magnification between the wide-angle end and the telephoto end, and wherein 1xL is the distance from the object side surface of the first lens to the imaging surface at the wide-angle end, 2xL is the distance from the object side surface of the first lens to the imaging surface at the telephoto end, and 1xL / 2xL is greater than 0.7.

[0026] The first lens may have a positive refractive power.

[0027] Other features and aspects will become apparent in accordance with the appended claims, the drawings, and the following detailed description. Description of the Drawings

[0028] Figure 1A is a cross-sectional view of an optical system in a first position according to a first exemplary embodiment of the present disclosure.

[0029] Figure 1B is a cross-sectional view of an optical system in a second position according to a first exemplary embodiment of the present disclosure.

[0030] Figure 1C depicts a graph showing aberration characteristics of an optical system according to a first exemplary embodiment of the present disclosure.

[0031] Figure 2A is a cross-sectional view of an optical system in a first position according to a second exemplary embodiment of the present disclosure.

[0032] Figure 2B is a cross-sectional view of an optical system in a second position according to a second exemplary embodiment of the present disclosure.

[0033] Figure 2C depicts a graph showing aberration characteristics of an optical system according to a second exemplary embodiment of the present disclosure.

[0034] Figure 3A is a cross-sectional view of an optical system in a first position according to a third exemplary embodiment of the present disclosure.

[0035] Figure 3B is a cross-sectional view of an optical system in a second position according to a third exemplary embodiment of the present disclosure.

[0036] Figure 3C depicts a graph showing aberration characteristics of an optical system according to a third exemplary embodiment of the present disclosure.

[0037] Figure 4A is a cross-sectional view of an optical system in a first position according to a fourth exemplary embodiment of the present disclosure.

[0038] Figure 4B is a cross-sectional view of an optical system in a second position according to a fourth exemplary embodiment of the present disclosure.

[0039] Figure 4C depicts a graph showing aberration characteristics of an optical system according to a fourth exemplary embodiment of the present disclosure.

[0040] Figure 5A is a cross-sectional view of an optical system in a first position according to a fifth exemplary embodiment of the present disclosure.

[0041] Figure 5BIt is a cross-sectional view showing the optical system in the second position according to the fifth exemplary embodiment of the present disclosure.

[0042] Figure 5C A graph depicting the aberration characteristics of the optical system according to the fifth exemplary embodiment of the present disclosure is shown.

[0043] Figure 6A It is a cross-sectional view showing the optical system in the first position according to the sixth exemplary embodiment of the present disclosure.

[0044] Figure 6B It is a cross-sectional view showing the optical system in the second position according to the sixth exemplary embodiment of the present disclosure.

[0045] Figure 6C A graph depicting the aberration characteristics of the optical system according to the sixth exemplary embodiment of the present disclosure is shown.

[0046] Figure 7A It is a cross-sectional view showing the optical system in the first position according to the seventh exemplary embodiment of the present disclosure.

[0047] Figure 7B It is a cross-sectional view showing the optical system in the second position according to the seventh exemplary embodiment of the present disclosure.

[0048] Figure 7C A graph depicting the aberration characteristics of the optical system according to the seventh exemplary embodiment of the present disclosure is shown.

[0049] Throughout the drawings and the detailed description, the same reference numerals refer to the same elements. For clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative dimensions, proportions, and depictions of elements in the drawings may be exaggerated. Detailed Description

[0050] Hereinafter, although the exemplary embodiments of the present disclosure will now be described in detail with reference to the drawings, it should be noted that the examples are not limited thereto.

[0051] The following detailed description is provided to assist the reader in obtaining a comprehensive understanding of the methods, apparatuses, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatuses, and / or systems described herein will be apparent after understanding the present disclosure. For example, the order of operations described herein is merely an example and, except for operations that must occur in a specific order, is not limited to the order set forth herein and may be changed, which will be apparent after understanding the present disclosure. Additionally, descriptions of features known in the art may be omitted for greater clarity and conciseness.

[0052] The features described herein can be implemented in various forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, apparatuses, and / or systems described herein that will be apparent after understanding the present disclosure.

[0053] 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, the element can be directly “on,” directly “connected to,” or directly “coupled to” the other element, or there can be one or more other elements intervening between the element and the other element. In contrast, when an element is described 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.

[0054] As used herein, the phrase “and / or” includes any one of the associated listed items and any combination of any two or more of the items; likewise, “at least one” includes any one of the associated listed items and any combination of any two or more of the items.

[0055] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited by these terms. Rather, these terms are only used to distinguish one component, part, region, layer, or section from another. Thus, a first component, first part, first region, first layer, or first section referred to in the examples herein could also be termed a second component, second part, second region, second layer, or second section without departing from the teachings of the examples described herein.

[0056] Spatial relative terms such as “above,” “upper,” “below,” “lower,” etc. may be used herein for convenience of description to describe the relationship of one element to another as shown in the figures. In addition to covering the orientations depicted in the figures, these spatial relative terms are intended to also cover different orientations of the device during use or operation. For example, if the device in the figures is flipped, an element described as “above” or “upper” relative to another element will be “below” or “lower” relative to the other element. Thus, depending on the spatial orientation of the device, the term “above” covers both the orientation of “above” and “below.” The device can also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0057] The terms used herein are for the purpose of describing various examples only and are not intended to limit the disclosure. Unless the context clearly dictates otherwise, the articles "a," "an," and "the" are intended to include the plural forms as well. The phrases "comprising," "including," and "having" specify the presence of the stated features, numbers, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, components, elements, and / or combinations thereof.

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

[0059] It should be noted that, herein, the phrase "may" is used with respect to an example, e.g., with respect to what an example may include or implement, meaning that there is at least one example in which such a feature is included or implemented, while all examples are not limited thereto.

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

[0061] In an exemplary embodiment, the X-direction, Y-direction, and Z-direction may refer, respectively, to the directions parallel to the X-axis, Y-axis, and Z-axis shown in the drawings. Additionally, the X-direction may include the +X-axis direction and the -X-axis direction, and unless otherwise stated, the same may also apply to the Y-direction and Z-direction.

[0062] In an exemplary embodiment, the concept that two directions (or axes) are parallel or perpendicular to each other may also include examples in which two directions (or axes) are substantially parallel or substantially perpendicular to each other. For example, the concept that a first axis and a second axis are perpendicular to each other may indicate that the first axis and the second axis may form an angle of 90 degrees or an angle close to 90 degrees.

[0063] The paragraphs starting with "In an exemplary embodiment" do not necessarily refer to the same embodiment. Specific features, structures, or characteristics may be combined in any suitable manner consistent with the disclosure.

[0064] In an exemplary embodiment, "configured to" means that a component may include the structure necessary to implement a specific function.

[0065] The effective semi-aperture of a lens surface is the radius of the portion of the lens surface through which light actually passes and is not necessarily the radius of the outer edge of the lens surface. The object side surface of the lens and the image side surface of the lens may have different effective semi-apertures.

[0066] In other words, the effective semi-aperture of the lens surface is the distance between the optical axis of the lens surface and the marginal ray of the light passing through the lens surface in a direction perpendicular to the optical axis of the lens surface.

[0067] The thickness, size, and shape of the lenses in the drawings may be exaggerated, and specifically, the shape of the spherical surface or aspherical surface presented in the drawings of the lens configuration is merely an example, and the shape is not limited thereto.

[0068] The optical system according to an exemplary embodiment may be mounted on a portable electronic device. For example, the optical system may be a component of a camera module mounted on a portable electronic device. The portable electronic device may be implemented as a portable electronic device such as a mobile communication terminal, a smart phone, or a tablet PC.

[0069] In the exemplary embodiment, the units of the radius of curvature, thickness, distance, focal length, etc. are expressed in millimeters (mm), and the unit of the field of view is expressed in degrees.

[0070] In the description of the shape of each lens, a configuration in which one surface is convex means that the paraxial region portion of the surface may be convex, and a configuration in which one surface is concave means that the paraxial region portion of the surface may be concave. Therefore, even when it is described that one surface of the lens may be convex, the edge portion of the lens may be concave.

[0071] The paraxial region of the lens surface refers to the central portion of the lens surface that surrounds and includes the optical axis of the lens surface. In the paraxial region of the lens surface, the light rays incident on the lens surface form a small angle θ with the optical axis, and the approximations sinθ≈θ, tanθ≈θ, and cosθ≈1 are valid.

[0072] The optical system may further include an image sensor having an imaging surface disposed at the imaging plane of the optical system. The image sensor converts an image of an object formed on the effective imaging region of the imaging surface by the lens of the optical system into an electrical signal.

[0073] IMG HT is the maximum effective image height of the optical system and is equal to half of the diagonal length of the effective imaging region of the imaging surface (imaging plane) of the image sensor.

[0074] The optical system may further include at least one reflecting member having a reflecting surface that changes the direction of the optical path in the optical system. For example, the reflecting member may be a prism or a mirror. For example, the reflecting member may be disposed in the optical path on the object side of the first lens, between any two of the second lens to the last lens (the sixth lens, the seventh lens, or the eighth lens), or on the image side of the last lens (the sixth lens, the seventh lens, or the eighth lens).

[0075] The first lens (or the frontmost lens) may refer to the lens closest to the object side (or the first reflecting member), and the last lens (or the rearmost lens) may refer to the lens closest to the image sensor (or the last reflecting member).

[0076] When describing the configuration of each lens, the image side may indicate, for example, the direction of the imaging surface on which an image is formed or the direction in which the image sensor is disposed, and the object side may indicate the direction in which the object is disposed. In addition, the "object surface" of the lens may refer to, for example, the lens surface on the side where the object exists with respect to the optical axis, and the "image surface" may refer to the lens surface on the side where the imaging surface exists with respect to the optical axis. The imaging surface may be, for example, the surface of an imaging device or the surface of an image sensor. The image sensor may include, for example, sensors such as complementary metal oxide semiconductors or charge coupled devices. The image sensor is not limited thereto, and may be implemented as a device that converts an image of an object into an electrical image signal, for example.

[0077] One or more exemplary embodiments of the present disclosure provide an optical system that provides various magnifications using a single camera, and also provide an optical system that provides various magnifications and captures high-resolution images using a single camera.

[0078] Referring to Figures 1A through 7B , the optical system may include two lens groups and an image sensor. Each of the first lens group and the second lens group may move in the optical axis direction relative to the image sensor. When the distance between the first lens group, the second lens group, and the image sensor changes, the magnification of the optical system may change. That is, each of the first lens group and the second lens group may be configured to move in the optical axis direction when changing the magnification from the wide-angle end to the telephoto end.

[0079] When the first lens group, the second lens group, and the image sensor are disposed with a distance therebetween as shown in Figure 1A , Figure 2A , Figure 3A , Figure 4A , Figure 5A , Figure 6A or Figure 7A , the optical system may be defined as being in the first position (Position 1). When the first lens group, the second lens group, and the image sensor are disposed with a distance therebetween as shown inFigure 1B , Figure 2B , Figure 3B , Figure 4B , Figure 5B , Figure 6B or when at the distances shown in FIGS. 7A or 7B, the optical system can be defined as being in the second position (Position 2). Referring to Table 1, Table 3, Table 5, Table 7, Table 9, Table 11, or Table 13, when the optical system in each exemplary embodiment is set at the first position and the second position, the distance between the first lens group and the second lens group and the distance between the second lens group and the image sensor can change. In the exemplary embodiment, the first position can be referred to as the wide-angle end, and the second position can be referred to as the telephoto end. That is, when the first lens group and the second lens group are set at the first position, the optical system can be at the wide-angle end, and when the first lens group and the second lens group are set at the second position, the optical system can be at the telephoto end.

[0080] The optical system can include an infrared filter disposed between the lens closest to the image side and the image sensor. The infrared filter can be formed of, for example, a glass material. However, other materials can also be used. In another exemplary embodiment, the infrared filter can be not provided. The optical system can include an aperture stop disposed between the first lens group and the second lens group.

[0081] The first lens group can have a positive refractive power, and the second lens group can have a negative refractive power. Each lens group can include at least one lens having a refractive power. In the exemplary embodiment, unless otherwise specified, a lens can refer to a lens having a refractive power. When a lens group includes two or more lenses, the lenses included in the lens group can move together while maintaining the distance between them.

[0082] The optical system can include a total of six, seven, or eight lenses having a refractive power. For example, the optical system can include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially disposed from the object side to the image side. As another example, the optical system can include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially disposed from the object side to the image side. As another example, the optical system can include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens sequentially disposed from the object side to the image side.

[0083] The first lens group can include four or five lenses. The second lens group can include two or three lenses.

[0084] The optical system may include at least one aspherical lens. In an exemplary embodiment, at least one of the object side and the image side of at least one of the lenses included in the optical system may be aspherical. In an exemplary embodiment, at least one of the two lens groups included in the optical system may include at least one lens having at least one of its object side and image side being aspherical. In an exemplary embodiment, an aspherical lens may refer to a lens having at least one of its object side and image side being aspherical.

[0085] The aspherical surface of the lens may be represented by Equation 1.

[0086] Equation 1

[0087]

[0088] In Equation 1, c is the curvature of the lens, K is the conic constant, and Y represents the distance from an arbitrary point on the aspherical surface of the lens to the optical axis. In addition, the constants A to H, J, and L to P refer to aspherical coefficients. Z represents the distance from an arbitrary point on the aspherical surface of the lens to the vertex of the aspherical surface in the optical axis direction.

[0089] In an exemplary embodiment, at least one of the object side and the image side of at least one of the lenses included in the optical system may include an inflection point. For example, at least one of the object side and the image side of the lens may be concave in the paraxial region and convex in the outer region of the paraxial region. As another example, at least one of the object side and the image side of the lens may be convex in the paraxial region and concave in the outer region of the paraxial region.

[0090] In an exemplary embodiment, the lens may be formed of a plastic material. In at least a part of the exemplary embodiment, the lens may be formed of an injection-molded plastic material. In an exemplary embodiment, the optical path changing element may be formed of a glass material or a plastic material. However, other transparent optical materials may also be used. In addition, in an exemplary embodiment, other elements of the lens element may be formed of materials having different optical properties (such as different Abbe numbers and / or different refractive indices).

[0091] In an exemplary embodiment, one or more lenses may have other shapes, such as, for example, an elliptical shape, a rectangular shape, a square shape, or a rectangular shape with rounded corners. In an exemplary embodiment, the lens may have a D-shaped cut shape. For example, the length of the lens in the first axis (Y-axis) direction perpendicular to the optical axis (Z-axis) may be less than the length in the second axis (X-axis) direction perpendicular to both the optical axis and the first axis (Y-axis).

[0092] The optical system can be configured to satisfy at least one of the following conditional expressions:

[0093] (Conditional Expression 1) G1_OAL < 10 mm

[0094] (Conditional Expression 2) 1 < |1x_f / f3| < 2

[0095] (Conditional Expression 3) 2 < |2x_f / f3| < 3.8

[0096] (Conditional Expression 4) 0.7 < 1xL / 2xL

[0097] (Conditional Expression 5) 0.1 < 1xB / 2xB

[0098] (Conditional Expression 6) 0.5 < |G1F / G2F| < 1

[0099] G1_OAL is the thickness of the first lens group and can be defined as the distance between the object-side vertex of the lens closest to the object side among the lenses included in the first lens group and the image-side vertex of the lens closest to the image side. 1x_f is the focal length of the optical system at the first position, 2x_f is the focal length of the optical system at the second position, and f3 is the focal length of the third lens of the optical system. 1xL is the distance from the object side surface of the lens closest to the object side among at least one lens of the first lens group to the imaging surface at the first position, and 2xL is the distance from the object side surface of the lens closest to the object side among at least one lens of the first lens group to the imaging surface at the second position. The thickness from the frontmost lens to the rearmost lens can refer to the distance between the object-side vertex of the frontmost lens and the image-side vertex of the rearmost lens. 1xB is the distance from the image-side vertex of the rearmost lens to the imaging surface at the first position, and 2xB is the distance from the image-side vertex of the rearmost lens to the imaging surface at the second position. G1F is the focal length of the first lens group, and G2F is the focal length of the second lens group.

[0100] The thicknesses of the lenses and other elements, the distances between two adjacent ones of the lenses and other elements, G1_OAL, 1xL, 2xL, 1xB, and 2xB are measured along the optical axis of the optical system.

[0101] Refer to Figure 1A 、 Figure 1B 、 Figure 3A 、 Figure 3B 、 Figure 5A 、 Figure 5B 、 Figure 7A and Figure 7BIn the exemplary embodiments shown, in the exemplary embodiments, the optical systems 100, 300, 500, and 700 may respectively include, in a direction from the object side to the image side: a first lens 111, 311, 511, and 711; a second lens 112, 312, 512, and 712; a third lens 113, 313, 513, and 713; a fourth lens 114, 314, 514, and 714; a fifth lens 115, 315, 515, and 715; a sixth lens 121, 321, 521, and 721; a seventh lens 122, 322, 522, and 722; and an image sensor 140, 340, 540, and 740. The first lens 111, 311, 511, and 711 to the fifth lens 115, 315, 515, and 715 may be respectively included in a first lens group 110, 310, 510, and 710, and the sixth lens 121, 321, 521, and 721 and the seventh lens 122, 322, 522, and 722 may be respectively included in a second lens group 120, 320, 520, and 720. The optical system may also respectively include an aperture stop disposed between the fifth lens 115, 315, 515, and 715 and the sixth lens 121, 321, 521, and 721. The optical system may also respectively include an IR filter 130, 330, 530, and 730 disposed between the seventh lens 122, 322, 522, and 722 and the image sensor 140, 340, 540, and 740. The optical system may include seven lenses having refractive power.

[0102] The first lens 111, 311, 511, and 711 may have a negative refractive power. The object side surface of the first lens 111, 311, 511, and 711 may be convex in the paraxial region. The image side surface of the first lens 111, 311, 511, and 711 may be concave in the paraxial region. The object side surface of the first lens 111, 311, 511, and 711 may be aspherical. The image side surface of the first lens 111, 311, 511, and 711 may be aspherical.

[0103] The second lens 112, 312, 512, and 712 may have a positive refractive power. The object side surface of the second lens 112, 312, 512, and 712 may be convex in the paraxial region. The image side surface of the second lens 112, 312, 512, and 712 may be concave in the paraxial region. The object side surface of the second lens 112, 312, 512, and 712 may be aspherical. The image side surface of the second lens 112, 312, 512, and 712 may be aspherical.

[0104] The third lenses 113, 313, 513, and 713 may have negative refractive power. The object side surfaces of the third lenses 113, 313, 513, and 713 may be concave in the paraxial region. The image side surfaces of the third lenses 113, 313, 513, and 713 may be concave in the paraxial region. The object side surfaces of the third lenses 113, 313, 513, and 713 may be aspherical. The image side surfaces of the third lenses 113, 313, 513, and 713 may be aspherical.

[0105] The fourth lenses 114, 314, 514, and 714 may have positive refractive power. The object side surfaces of the fourth lenses 114, 314, 514, and 714 may be convex in the paraxial region. The image side surfaces of the fourth lenses 114, 314, 514, and 714 may be convex in the paraxial region. The object side surfaces of the fourth lenses 114, 314, 514, and 714 may be aspherical. The image side surfaces of the fourth lenses 114, 314, 514, and 714 may be aspherical.

[0106] The fifth lenses 115, 315, 515, and 715 may have positive refractive power. The object side surfaces of the fifth lenses 115, 315, 515, and 715 may be concave in the paraxial region. The image side surfaces of the fifth lenses 115, 315, 515, and 715 may be convex in the paraxial region. The object side surfaces of the fifth lenses 115, 315, 515, and 715 may be aspherical. The image side surfaces of the fifth lenses 115, 315, 515, and 715 may be aspherical.

[0107] The sixth lenses 121, 321, 521, and 721 may have positive refractive power. The object side surfaces of the sixth lenses 121, 321, 521, and 721 may be concave in the paraxial region. The image side surfaces of the sixth lenses 121, 321, 521, and 721 may be convex in the paraxial region. The object side surfaces of the sixth lenses 121, 321, 521, and 721 may be aspherical. The image side surfaces of the sixth lenses 121, 321, 521, and 721 may be aspherical.

[0108] The seventh lenses 122, 322, 522, and 722 may have negative refractive power. The object side surfaces of the seventh lenses 122, 322, 522, and 722 may be concave in the paraxial region. The image side surfaces of the seventh lenses 122, 322, 522, and 722 may be concave or convex in the paraxial region. The object side surfaces of the seventh lenses 122, 322, 522, and 722 may be aspherical. The image side surfaces of the seventh lenses 122, 322, 522, and 722 may be aspherical.

[0109] Refer to Figure 4A , Figure 4B , Figure 6A and Figure 6BIn the exemplary embodiments shown, the optical systems 400 and 600 may respectively include two lens groups and image sensors 440 and 640. The first lens groups 410 and 610 may respectively include a first lens 411 and 611, a second lens 412 and 612, a third lens 413 and 613, a fourth lens 414 and 614, and a fifth lens 415 and 615, and the second lens groups 420 and 620 may respectively include a sixth lens 421 and 621, a seventh lens 422 and 622, and an eighth lens 423 and 623. The optical systems 400 and 600 may respectively include an aperture stop disposed between the fifth lenses 415 and 615 and the sixth lenses 421 and 621. The optical systems 400 and 600 may respectively include IR filters 430 and 630 disposed between the eighth lenses 423 and 623 and the image sensors 440 and 640. The optical systems 400 and 600 may include eight lenses having refractive power.

[0110] The first lenses 411 and 611 may have positive refractive power. The first lenses 411 and 611 may have a meniscus shape convex toward the object side or the image side. The object side surfaces of the first lenses 411 and 611 may be aspherical. The image side surfaces of the first lenses 411 and 611 may be aspherical.

[0111] The second lenses 412 and 612 may have positive refractive power. The object side surfaces of the second lenses 412 and 612 may be convex in the paraxial region. The image side surfaces of the second lenses 412 and 612 may be concave in the paraxial region. The object side surfaces of the second lenses 412 and 612 may be aspherical. The image side surfaces of the second lenses 412 and 612 may be aspherical.

[0112] The third lenses 413 and 613 may have negative refractive power. The object side surfaces of the third lenses 413 and 613 may be concave in the paraxial region. The image side surfaces of the third lenses 413 and 613 may be concave in the paraxial region. The object side surfaces of the third lenses 413 and 613 may be aspherical. The image side surfaces of the third lenses 413 and 613 may be aspherical.

[0113] The fourth lenses 414 and 614 may have positive refractive power. The object side surfaces of the fourth lenses 414 and 614 may be convex or concave in the paraxial region. The image side surfaces of the fourth lenses 414 and 614 may be convex in the paraxial region. The object side surfaces of the fourth lenses 414 and 614 may be aspherical. The image side surfaces of the fourth lenses 414 and 614 may be aspherical.

[0114] The fifth lenses 415 and 615 may have positive refractive power. The object sides of the fifth lenses 415 and 615 may be convex in the paraxial region. The image sides of the fifth lenses 415 and 615 may be concave or convex in the paraxial region. The object sides of the fifth lenses 415 and 615 may be aspherical. The image sides of the fifth lenses 415 and 615 may be aspherical.

[0115] The sixth lenses 421 and 621 may have positive refractive power. The object sides of the sixth lenses 421 and 621 may be concave in the paraxial region. The image sides of the sixth lenses 421 and 621 may be convex in the paraxial region. The object sides of the sixth lenses 421 and 621 may be aspherical. The image sides of the sixth lenses 421 and 621 may be aspherical.

[0116] The seventh lenses 422 and 622 may have positive refractive power. The object sides of the seventh lenses 422 and 622 may be concave in the paraxial region. The image sides of the seventh lenses 422 and 622 may be convex in the paraxial region. The object sides of the seventh lenses 422 and 622 may be aspherical. The image sides of the seventh lenses 422 and 622 may be aspherical.

[0117] The eighth lenses 423 and 623 may have negative refractive power. The object sides of the eighth lenses 423 and 623 may be concave in the paraxial region. The image sides of the eighth lenses 423 and 623 may be convex in the paraxial region. The object sides of the eighth lenses 423 and 623 may be aspherical. The image sides of the eighth lenses 423 and 623 may be aspherical.

[0118] Hereinafter, reference will be made to Figures 1A through 1C describe the optical system 100 according to the first exemplary embodiment.

[0119] Figure 1A is a cross-sectional view showing the optical system 100 in the first position according to the first exemplary embodiment. Figure 1B is a cross-sectional view showing the optical system 100 in the second position according to the first exemplary embodiment. Figure 1C depicts a graph showing the aberration characteristics of the optical system 100 according to the first exemplary embodiment.

[0120] The optical system 100 may include two lens groups and an image sensor 140. The first lens group 110 may include a first lens 111, a second lens 112, a third lens 113, a fourth lens 114, and a fifth lens 115, and the second lens group 120 may include a sixth lens 121 and a seventh lens 122.

[0121] When the first lens group 110 and the second lens group 120 move relative to the image sensor 140 in the optical axis direction, the magnification of the optical system 100 can be changed. The magnification at the first position can be approximately twice the magnification at the second position.

[0122] The focal length can be 10.4 mm at the first position and 20.2 mm at the second position. The F-number can be 2.3 at the first position and 4.6 at the second position. Half of the diagonal length of the imaging plane IP of the image sensor 140 can be 8.166 mm.

[0123] The first lens group 110 can have positive refractive power, and the second lens group 120 can have negative refractive power. The focal length of the first lens group 110 can be 8.64 mm, and the focal length of the second lens group 120 can be -9.96 mm.

[0124] The optical system 100 can include an aperture stop disposed between the fifth lens 115 and the sixth lens 121. The optical system 100 can include an IR filter 130 disposed between the seventh lens 122 and the image sensor 140. The optical system 100 can include seven lenses having refractive power. Two adjacent lenses among the lenses of the optical system 100 can be spaced apart from each other in the optical axis direction.

[0125] The first lens 111 can have negative refractive power. The object side surface of the first lens 111 can be convex in the paraxial region. The image side surface of the first lens 111 can be concave in the paraxial region. The object side surface of the first lens 111 can be aspherical. The image side surface of the first lens 111 can be aspherical.

[0126] The second lens 112 can have positive refractive power. The object side surface of the second lens 112 can be convex in the paraxial region. The image side surface of the second lens 112 can be concave in the paraxial region. The object side surface of the second lens 112 can be aspherical. The image side surface of the second lens 112 can be aspherical.

[0127] The third lens 113 can have negative refractive power. The object side surface of the third lens 113 can be concave in the paraxial region. The image side surface of the third lens 113 can be concave in the paraxial region. The object side surface of the third lens 113 can be aspherical. The image side surface of the third lens 113 can be aspherical.

[0128] The fourth lens 114 can have positive refractive power. The object side surface of the fourth lens 114 can be convex in the paraxial region. The image side surface of the fourth lens 114 can be convex in the paraxial region. The object side surface of the fourth lens 114 can be aspherical. The image side surface of the fourth lens 114 can be aspherical.

[0129] The fifth lens 115 may have a positive refractive power. The object side surface of the fifth lens 115 may be concave in the paraxial region. The image side surface of the fifth lens 115 may be convex in the paraxial region. The object side surface of the fifth lens 115 may be aspherical. The image side surface of the fifth lens 115 may be aspherical.

[0130] The sixth lens 121 may have a positive refractive power. The object side surface of the sixth lens 121 may be concave in the paraxial region. The image side surface of the sixth lens 121 may be convex in the paraxial region. The object side surface of the sixth lens 121 may be aspherical. The image side surface of the sixth lens 121 may be aspherical.

[0131] The seventh lens 122 may have a negative refractive power. The object side surface of the seventh lens 122 may be concave in the paraxial region. The image side surface of the seventh lens 122 may be concave in the paraxial region. The object side surface of the seventh lens 122 may be aspherical. The image side surface of the seventh lens 122 may be aspherical.

[0132] The image side surface of the first lens 111 may include an inflection point.

[0133] The object side surface of the second lens 112 may include an inflection point. The object side surface of the second lens 112 may be convex in the paraxial region and may be concave in the outer region of the paraxial region.

[0134] The image side surface of the third lens 113 may include an inflection point. The image side surface of the third lens 113 may be concave in the paraxial region and may be convex in the outer region of the paraxial region.

[0135] The object side surface of the sixth lens 121 may include an inflection point. The image side surface of the sixth lens 121 may include an inflection point.

[0136] The object side surface of the seventh lens 122 may include an inflection point. The image side surface of the seventh lens 122 may include an inflection point. The image side surface of the seventh lens 122 may be concave in the paraxial region and may be convex in the outer region of the paraxial region.

[0137] In the optical system 100 of the first exemplary embodiment, G1_OAL may be 6.738, |1x_f / f3| may be 1.096, |2x_f / f3| may be 2.129, 1xL / 2xL may be 0.713, 1xB / 2xB may be 0.115, and |G1F / G2F| may be 0.868.

[0138] Table 1 lists the optical and physical parameters of the optical system 100 in the first exemplary embodiment. Table 2 lists the aspherical data of the optical system 100 in the first exemplary embodiment.

[0139] Table 1

[0140]

[0141]

[0142] Table 2

[0143] Surface number 2 3 4 5 6 7 8 Y radius 9.5069E+01 4.4709E+01 1.0490E+01 1.4768E+01 -1.4225E+01 1.0850E+01 7.3150E+00 Conic constant (K) 9.9000E+01 9.8404E+01 -4.3730E+01 -3.2686E+01 3.5049E+01 -8.9463E+01 -1.1014E+01 4th order coefficient (A) 8.0332E-01 3.3606E-01 -1.8993E-02 -9.9161E-03 -3.5126E-02 -2.2478E-02 -5.4681E-02 6th order coefficient (B) 4.3805E-02 -6.7681E-02 -2.8202E-02 -5.9002E-03 -5.1307E-04 -3.6775E-03 -1.0240E-03 8th order coefficient (C) 5.2151E-03 -7.8612E-03 1.0955E-03 -3.3431E-04 -5.4440E-04 -5.2316E-05 -8.7277E-04 10th order coefficient (D) -8.6819E-04 1.4104E-03 7.2242E-04 1.9765E-04 1.1087E-04 -7.1153E-05 2.1666E-05 12th order coefficient (E) -2.1753E-03 7.2829E-05 1.1081E-04 2.3107E-05 -1.4233E-05 4.4869E-05 2.7837E-05 14th order coefficient (F) -4.9061E-04 4.0814E-04 -3.9319E-05 -3.8904E-06 9.4622E-06 -1.1207E-05 -8.0924E-06 16th order coefficient (G) -2.4421E-04 -2.2666E-05 6.1116E-06 -2.4224E-06 -2.9097E-06 2.4394E-06 4.7237E-06 18th order coefficient (H) -9.4343E-05 -1.0253E-04 -1.8252E-06 9.3625E-07 6.8498E-08 -5.2183E-07 -1.1079E-06 20th order coefficient (J) 3.9891E-05 2.2737E-05 1.8715E-07 -9.1957E-08 9.9071E-08 4.6964E-08 6.6615E-08 Surface number 9 10 11 13 14 15 16 Y radius -9.9275E+00 -9.4935E+00 -4.1741E+00 -6.1652E+00 -4.8293E+00 -6.9199E+00 1.3461E+01 Conic constant (K) 1.0244E+01 6.2199E+00 -1.8878E+00 3.8936E-01 -1.5938E+00 2.9115E-01 -4.5636E+00 4th order coefficient (A) -1.5368E-01 -1.2637E-01 -1.9996E-02 1.5989E+00 1.7526E+00 -1.3132E-01 -2.9760E+00 6th order coefficient (B) -1.1054E-02 5.0470E-04 1.2246E-02 -1.7064E-01 -1.7681E-01 4.2361E-01 2.2264E-01 8th order coefficient (C) 2.6698E-03 1.4803E-02 7.2330E-03 -8.5672E-02 -5.8037E-02 8.0369E-02 -5.2663E-02 10th order coefficient (D) -4.8137E-05 -3.3508E-04 -3.7263E-03 -1.9243E-02 7.2627E-03 -4.2234E-02 5.1517E-02 12th order coefficient (E) -5.5320E-05 -1.4818E-03 -2.6036E-03 -2.9827E-04 2.4172E-02 8.4567E-03 -8.6508E-03 14th order coefficient (F) 9.1808E-06 -1.0599E-04 1.1017E-04 -3.9872E-03 -6.1663E-03 -5.9648E-03 -6.1306E-03 16th order coefficient (G) -6.3876E-06 9.1408E-05 2.1466E-04 -3.1401E-03 -3.8977E-03 1.5894E-03 4.0698E-03 18th order coefficient (H) 3.4472E-06 3.0656E-05 -1.6670E-05 -1.0592E-03 1.6659E-03 -8.2069E-04 -7.4376E-04 20th order coefficient (J) -4.9792E-07 -1.6995E-05 -4.2731E-05 -1.1095E-03 -2.7346E-04 2.3542E-04 5.3248E-03

[0144] In the following, reference will be made to Figures 2A through 2C describe the optical system 200 according to the second exemplary embodiment.

[0145] Figure 2A is a cross-sectional view showing the optical system 200 in the first position according to the second exemplary embodiment. Figure 2B is a cross-sectional view showing the optical system 200 in the second position according to the second exemplary embodiment. Figure 2C depicts a graph showing the aberration characteristics of the optical system 200 according to the second exemplary embodiment.

[0146] The optical system 200 may include two lens groups and an image sensor 240. The first lens group 210 may include a first lens 211, a second lens 212, a third lens 213, and a fourth lens 214, and the second lens group 220 may include a fifth lens 221 and a sixth lens 222.

[0147] When the first lens group 210 and the second lens group 220 move in the optical axis direction relative to the image sensor 240, the magnification of the optical system 200 can be changed. The magnification in the first position may be approximately twice the magnification in the second position.

[0148] The focal length may be 13.4 mm in the first position and 25.5 mm in the second position. The F-number may be 3.9 in the first position and 7.3 in the second position. Half of the length of the diagonal of the imaging plane IP of the image sensor 240 may be 8.166 mm.

[0149] The first lens group 210 may have a positive refractive power, and the second lens group 220 may have a negative refractive power. The focal length of the first lens group 210 may be 10.24 mm, and the focal length of the second lens group 220 may be -10.25 mm.

[0150] The optical system 200 may include an aperture stop ST disposed between the fourth lens 214 and the fifth lens 221. The optical system 200 may include an IR filter 230 disposed between the sixth lens 222 and the image sensor 240. The optical system 200 may include six lenses having refractive powers. Two lenses adjacent to each other among the lenses of the optical system 200 may be spaced apart from each other in the optical axis direction.

[0151] The first lens 211 may have a negative refractive power. The object side surface of the first lens 211 may be convex in the paraxial region. The image side surface of the first lens 211 may be concave in the paraxial region. The object side surface of the first lens 211 may be aspherical. The image side surface of the first lens 211 may be aspherical.

[0152] The second lens 212 may have a negative refractive power. The object side surface of the second lens 212 may be concave in the paraxial region. The image side surface of the second lens 212 may be concave in the paraxial region. The object side surface of the second lens 212 may be aspherical. The image side surface of the second lens 212 may be aspherical.

[0153] The third lens 213 may have a positive refractive power. The object side surface of the third lens 213 may be convex in the paraxial region. The image side surface of the third lens 213 may be convex in the paraxial region. The object side surface of the third lens 213 may be aspherical. The image side surface of the third lens 213 may be aspherical.

[0154] The fourth lens 214 may have a positive refractive power. The object side surface of the fourth lens 214 may be convex in the paraxial region. The image side surface of the fourth lens 214 may be convex in the paraxial region. The object side surface of the fourth lens 214 may be aspherical. The image side surface of the fourth lens 214 may be aspherical.

[0155] The fifth lens 221 may have a positive refractive power. The object side surface of the fifth lens 221 may be concave in the paraxial region. The image side surface of the fifth lens 221 may be convex in the paraxial region. The object side surface of the fifth lens 221 may be aspherical. The image side surface of the fifth lens 221 may be aspherical.

[0156] The sixth lens 222 may have a negative refractive power. The object side surface of the sixth lens 222 may be concave in the paraxial region. The image side surface of the sixth lens 222 may be convex in the paraxial region. The object side surface of the sixth lens 222 may be aspherical. The image side surface of the sixth lens 222 may be aspherical.

[0157] The object side surface of the first lens 211 may include an inflection point. The image side surface of the first lens 211 may include an inflection point. The image side surface of the first lens 211 may be concave in the paraxial region and may be convex in the outer region of the paraxial region.

[0158] The object side surface of the fifth lens 221 may include an inflection point.

[0159] In the second exemplary embodiment, G1_OAL may be 6.723, |1x_f / f3| may be 1.951, |2x_f / f3| may be 3.712, 1xL / 2xL may be 0.697, 1xB / 2xB may be 0.166, and |G1F / G2F| may be 1.

[0160] Table 3 lists the optical and physical parameters of the optical system 200 in the second exemplary embodiment.

[0161] Table 4 lists the aspherical data of the optical system 200 in the second exemplary embodiment.

[0162] Table 3

[0163]

[0164]

[0165] Table 4

[0166]

[0167]

[0168] Hereinafter, reference will be made to Figures 3A through 3C describe the optical system 300 according to the third exemplary embodiment.

[0169] Figure 3A is a cross-sectional view showing the optical system 300 in the first position according to the third exemplary embodiment. Figure 3B is a cross-sectional view showing the optical system 300 in the second position according to the third exemplary embodiment. Figure 3C depicts a graph showing the aberration characteristics of the optical system 300 according to the third exemplary embodiment.

[0170] The optical system 300 may include two lens groups and an image sensor 340. The first lens group 310 may include a first lens 311, a second lens 312, a third lens 313, a fourth lens 314, and a fifth lens 315, and the second lens group 320 may include a sixth lens 321 and a seventh lens 322.

[0171] When the first lens group 310 and the second lens group 320 move relative to the image sensor 340 in the optical axis direction, the magnification of the optical system 300 can be changed. The magnification at the first position can be approximately twice the magnification at the second position.

[0172] The focal length can be 10.3 mm at the first position and 20.6 mm at the second position. The F-number can be 2.8 at the first position and 5.6 at the second position. Half of the length of the diagonal of the imaging surface IP of the image sensor 340 can be 8.166 mm.

[0173] The first lens group 310 can have a positive refractive power, and the second lens group 320 can have a negative refractive power. The focal length of the first lens group 310 can be 8.44 mm, and the focal length of the second lens group 320 can be -9.58 mm.

[0174] The optical system 300 can include an aperture stop disposed between the fifth lens 315 and the sixth lens 321. The optical system 300 can include an IR filter 330 disposed between the seventh lens 322 and the image sensor 340. The optical system 300 can include seven lenses having refractive powers. Two adjacent lenses among the lenses of the optical system 300 can be spaced apart from each other in the optical axis direction.

[0175] The first lens 311 can have a negative refractive power. The object side surface of the first lens 311 can be convex in the paraxial region. The image side surface of the first lens 311 can be concave in the paraxial region. The object side surface of the first lens 311 can be aspherical. The image side surface of the first lens 311 can be aspherical.

[0176] The second lens 312 can have a positive refractive power. The object side surface of the second lens 312 can be convex in the paraxial region. The image side surface of the second lens 312 can be concave in the paraxial region. The object side surface of the second lens 312 can be aspherical. The image side surface of the second lens 312 can be aspherical.

[0177] The third lens 313 can have a negative refractive power. The object side surface of the third lens 313 can be concave in the paraxial region. The image side surface of the third lens 313 can be concave in the paraxial region. The object side surface of the third lens 313 can be aspherical. The image side surface of the third lens 313 can be aspherical.

[0178] The fourth lens 314 can have a positive refractive power. The object side surface of the fourth lens 314 can be convex in the paraxial region. The image side surface of the fourth lens 314 can be convex in the paraxial region. The object side surface of the fourth lens 314 can be aspherical. The image side surface of the fourth lens 314 can be aspherical.

[0179] The fifth lens 315 may have a positive refractive power. The object side surface of the fifth lens 315 may be concave in the paraxial region. The image side surface of the fifth lens 315 may be convex in the paraxial region. The object side surface of the fifth lens 315 may be aspherical. The image side surface of the fifth lens 315 may be aspherical.

[0180] The sixth lens 321 may have a positive refractive power. The object side surface of the sixth lens 321 may be concave in the paraxial region. The image side surface of the sixth lens 321 may be convex in the paraxial region. The object side surface of the sixth lens 321 may be aspherical. The image side surface of the sixth lens 321 may be aspherical.

[0181] The seventh lens 322 may have a negative refractive power. The object side surface of the seventh lens 322 may be concave in the paraxial region. The image side surface of the seventh lens 322 may be convex in the paraxial region. The object side surface of the seventh lens 322 may be aspherical. The image side surface of the seventh lens 322 may be aspherical.

[0182] The object side surface of the sixth lens 321 may include an inflection point. The image side surface of the sixth lens 321 may include an inflection point. The image side surface of the sixth lens 321 may be convex in the paraxial region and may be concave in the outer region of the paraxial region.

[0183] The object side surface of the seventh lens 322 may include an inflection point.

[0184] In the third exemplary embodiment, G1_OAL may be 9.82, |1x_f / f3| may be 1.074, |2x_f / f3| may be 2.148, 1xL / 2xL may be 0.718, 1xB / 2xB may be 0.125, and |G1F / G2F| may be 0.882.

[0185] Table 5 lists the optical and physical parameters of the optical system 300 in the third exemplary embodiment.

[0186] Table 6 lists the aspherical data of the optical system 300 in the third exemplary embodiment.

[0187] Table 5

[0188]

[0189] Table 6

[0190]

[0191]

[0192] Hereinafter, reference will be made to Figures 4A through 4CDescribe the optical system 400 according to the fourth exemplary embodiment.

[0193] Figure 4A FIG. 4 is a cross-sectional view showing the optical system 400 in a first position according to the fourth exemplary embodiment. Figure 4B FIG. 5 is a cross-sectional view showing the optical system 400 in a second position according to the fourth exemplary embodiment. Figure 4C FIG. 6 depicts a graph showing the aberration characteristics of the optical system 400 according to the fourth exemplary embodiment.

[0194] The optical system 400 may include two lens groups and an image sensor 440. The first lens group 410 may include a first lens 411, a second lens 412, a third lens 413, a fourth lens 414, and a fifth lens 415, and the second lens group 420 may include a sixth lens 421, a seventh lens 422, and an eighth lens 423.

[0195] When the first lens group 410 and the second lens group 420 are moved in the optical axis direction relative to the image sensor 440, the magnification of the optical system 400 can be changed. The magnification in the first position may be approximately twice the magnification in the second position.

[0196] The focal length may be 12.1 mm in the first position and 21.2 mm in the second position. The F-number may be 2.8 in the first position and 4.9 in the second position. Half of the length of the diagonal of the imaging plane IP of the image sensor 440 may be 7.0132 mm.

[0197] The first lens group 410 may have a positive refractive power, and the second lens group 420 may have a negative refractive power. The focal length of the first lens group 410 may be 10.77 mm, and the focal length of the second lens group 420 may be -12.41 mm.

[0198] The optical system 400 may include an aperture stop ST disposed between the fifth lens 415 and the sixth lens 421. The optical system 400 may include an IR filter 430 disposed between the eighth lens 423 and the image sensor 440. The optical system 400 may include eight lenses having refractive power. Two adjacent lenses among the lenses of the optical system 400 may be spaced apart from each other in the optical axis direction.

[0199] The first lens 411 may have a positive refractive power. The object side surface of the first lens 411 may be convex in the paraxial region. The image side surface of the first lens 411 may be concave in the paraxial region. The object side surface of the first lens 411 may be aspherical. The image side surface of the first lens 411 may be aspherical.

[0200] The second lens 412 may have a positive refractive power. The object side surface of the second lens 412 may be convex in the paraxial region. The image side surface of the second lens 412 may be concave in the paraxial region. The object side surface of the second lens 412 may be aspherical. The image side surface of the second lens 412 may be aspherical.

[0201] The third lens 413 may have a negative refractive power. The object side surface of the third lens 413 may be concave in the paraxial region. The image side surface of the third lens 413 may be concave in the paraxial region. The object side surface of the third lens 413 may be aspherical. The image side surface of the third lens 413 may be aspherical.

[0202] The fourth lens 414 may have a positive refractive power. The object side surface of the fourth lens 414 may be convex in the paraxial region. The image side surface of the fourth lens 414 may be convex in the paraxial region. The object side surface of the fourth lens 414 may be aspherical. The image side surface of the fourth lens 414 may be aspherical.

[0203] The fifth lens 415 may have a positive refractive power. The object side surface of the fifth lens 415 may be convex in the paraxial region. The image side surface of the fifth lens 415 may be concave in the paraxial region. The object side surface of the fifth lens 415 may be aspherical. The image side surface of the fifth lens 415 may be aspherical.

[0204] The sixth lens 421 may have a positive refractive power. The object side surface of the sixth lens 421 may be concave in the paraxial region. The image side surface of the sixth lens 421 may be convex in the paraxial region. The object side surface of the sixth lens 421 may be aspherical. The image side surface of the sixth lens 421 may be aspherical.

[0205] The seventh lens 422 may have a positive refractive power. The object side surface of the seventh lens 422 may be concave in the paraxial region. The image side surface of the seventh lens 422 may be convex in the paraxial region. The object side surface of the seventh lens 422 may be aspherical. The image side surface of the seventh lens 422 may be aspherical.

[0206] The eighth lens 423 may have a negative refractive power. The object side surface of the eighth lens 423 may be concave in the paraxial region. The image side surface of the eighth lens 423 may be convex in the paraxial region. The object side surface of the eighth lens 423 may be aspherical. The image side surface of the eighth lens 423 may be aspherical.

[0207] The image side surface of the seventh lens 422 may include an inflection point.

[0208] The object side surface of the eighth lens 423 may include an inflection point.

[0209] In the fourth exemplary embodiment, G1_OAL can be 7.068, |1x_f / f3| can be 1.892, |2x_f / f3| can be 3.311, 1xL / 2xL can be 0.744, 1xB / 2xB can be 0.107, and |G1F / G2F| can be 0.868.

[0210] Table 7 lists the optical and physical parameters of the optical system 400 in the fourth exemplary embodiment. Table 8 lists the aspherical data of the optical system 400 in the fourth exemplary embodiment.

[0211] Table 7

[0212]

[0213]

[0214] Table 8

[0215]

[0216] Hereinafter, reference will be made to Figures 5A through 5C describe the optical system 500 according to the fifth exemplary embodiment.

[0217] Figure 5A is a cross-sectional view showing the optical system 500 in the first position according to the fifth exemplary embodiment. Figure 5B is a cross-sectional view showing the optical system 500 in the second position according to the fifth exemplary embodiment. Figure 5C depicts a graph showing the aberration characteristics of the optical system 500 according to the fifth exemplary embodiment.

[0218] The optical system 500 may include two lens groups and an image sensor 540. The first lens group 510 may include a first lens 511, a second lens 512, a third lens 513, a fourth lens 514, and a fifth lens 515, and the second lens group 520 may include a sixth lens 521 and a seventh lens 522.

[0219] When the first lens group 510 and the second lens group 520 are moved in the optical axis direction relative to the image sensor 540, the magnification of the optical system 500 can be changed. The magnification in the first position can be approximately twice the magnification in the second position.

[0220] The focal length can be 10.8 mm at the first position and 20.9 mm at the second position. The F-number can be 2.4 at the first position and 4.7 at the second position. Half of the length of the diagonal of the imaging plane IP of the image sensor 540 can be 8.166 mm.

[0221] The first lens group 510 can have a positive refractive power, and the second lens group 520 can have a negative refractive power. The focal length of the first lens group 510 can be 9.43 mm, and the focal length of the second lens group 520 can be -10.28 mm.

[0222] The optical system 500 can include an aperture stop disposed between the fifth lens 515 and the sixth lens 521. The optical system 500 can include an IR filter 530 disposed between the seventh lens 522 and the image sensor 540. The optical system 500 can include seven lenses having refractive powers. Two adjacent lenses among the lenses of the optical system 500 can be spaced apart from each other in the optical axis direction.

[0223] The first lens 511 can have a negative refractive power. The object side surface of the first lens 511 can be convex in the paraxial region. The image side surface of the first lens 511 can be concave in the paraxial region. The object side surface of the first lens 511 can be aspherical. The image side surface of the first lens 511 can be aspherical.

[0224] The second lens 512 can have a positive refractive power. The object side surface of the second lens 512 can be convex in the paraxial region. The image side surface of the second lens 512 can be concave in the paraxial region. The object side surface of the second lens 512 can be aspherical. The image side surface of the second lens 512 can be aspherical.

[0225] The third lens 513 can have a negative refractive power. The object side surface of the third lens 513 can be concave in the paraxial region. The image side surface of the third lens 513 can be concave in the paraxial region. The object side surface of the third lens 513 can be aspherical. The image side surface of the third lens 513 can be aspherical.

[0226] The fourth lens 514 can have a positive refractive power. The object side surface of the fourth lens 514 can be convex in the paraxial region. The image side surface of the fourth lens 514 can be convex in the paraxial region. The object side surface of the fourth lens 514 can be aspherical. The image side surface of the fourth lens 514 can be aspherical.

[0227] The fifth lens 515 may have a positive refractive power. The object side surface of the fifth lens 515 may be concave in the paraxial region. The image side surface of the fifth lens 515 may be convex in the paraxial region. The object side surface of the fifth lens 515 may be aspherical. The image side surface of the fifth lens 515 may be aspherical.

[0228] The sixth lens 521 may have a positive refractive power. The object side surface of the sixth lens 521 may be concave in the paraxial region. The image side surface of the sixth lens 521 may be convex in the paraxial region. The object side surface of the sixth lens 521 may be aspherical. The image side surface of the sixth lens 521 may be aspherical.

[0229] The seventh lens 522 may have a negative refractive power. The object side surface of the seventh lens 522 may be concave in the paraxial region. The image side surface of the seventh lens 522 may be concave in the paraxial region. The object side surface of the seventh lens 522 may be aspherical. The image side surface of the seventh lens 522 may be aspherical.

[0230] The image side surface of the first lens 511 may include an inflection point.

[0231] The object side surface of the second lens 512 may include an inflection point. The object side surface of the second lens 512 may be convex in the paraxial region and may be concave in the outer region of the paraxial region. The image side surface of the second lens 512 may include an inflection point. The image side surface of the second lens 512 may be concave in the paraxial region and may be convex in the outer region of the paraxial region.

[0232] The image side surface of the third lens 513 may include an inflection point. The image side surface of the third lens 513 may be concave in the paraxial region and may be convex in the outer region of the paraxial region.

[0233] The object side surface of the sixth lens 521 may include an inflection point. The image side surface of the sixth lens 521 may include an inflection point.

[0234] The image side surface of the seventh lens 522 may include an inflection point. The image side surface of the seventh lens 522 may be concave in the paraxial region and may be convex in the outer region of the paraxial region.

[0235] In the fifth exemplary embodiment, G1_OAL may be 6.786, |1x_f / f3| may be 1.221, |2x_f / f3| may be 2.369, 1xL / 2xL may be 0.717, 1xB / 2xB may be 0.113, and |G1F / G2F| may be 0.917.

[0236] Table 9 lists the optical and physical parameters of the optical system 500 in the fifth exemplary embodiment. Table 10 lists the aspherical data of the optical system 500 in the fifth exemplary embodiment.

[0237] Table 9

[0238]

[0239]

[0240] Table 10

[0241] Surface number 2 3 4 5 6 7 8 Y radius 7.2886E+01 4.0549E+01 1.1246E+01 1.6245E+01 -1.4229E+01 9.6516E+00 6.6116E+00 Conic constant (K) -6.9762E-01 9.9000E+01 -3.4225E+01 -5.0566E+01 3.5310E+01 -7.2587E+01 -1.1072E+01 4th order coefficient (A) 8.0087E-01 3.8404E-01 -1.1577E-02 -1.6381E-02 -4.2592E-02 -2.2086E-02 -5.2459E-02 6th order coefficient (B) 4.4074E-02 -6.8714E-02 -2.9233E-02 -7.7704E-03 -2.4765E-04 -3.0265E-03 -4.5843E-04 8th order coefficient (C) 5.6478E-03 -9.8784E-03 5.8635E-04 -2.1213E-04 -4.2376E-04 7.3781E-05 -9.0944E-04 10th order coefficient (D) -1.9451E-03 -1.0888E-03 6.9634E-04 1.9845E-04 1.0879E-04 -8.5359E-05 9.0919E-05 12th order coefficient (E) -3.1189E-03 -5.1631E-04 1.1518E-04 2.0417E-05 -1.4865E-05 4.9511E-05 3.1844E-05 14th order coefficient (F) -9.7042E-04 4.4451E-04 -3.7290E-05 -3.1963E-06 9.4247E-06 -1.2345E-05 -5.4241E-06 16th order coefficient (G) -4.1843E-04 1.4615E-04 6.5348E-06 -2.7576E-06 -2.6938E-06 2.6632E-06 4.4376E-06 18th order coefficient (H) -1.5459E-04 -6.8365E-05 -1.9439E-06 8.8526E-07 5.5144E-08 -5.2435E-07 -1.1634E-06 20th order coefficient (J) -1.0463E-05 -2.2335E-05 1.5849E-07 -8.3805E-08 6.9435E-08 2.9136E-08 4.0909E-08 Surface number 9 10 11 13 14 15 16 Y radius -1.0068E+01 -9.7359E+00 -4.2933E+00 -5.9709E+00 -4.7441E+00 -8.6091E+00 1.0546E+01 Conic constant (K) 1.0323E+01 6.6435E+00 -1.9915E+00 -8.0418E-02 -1.2461E+00 1.5218E+00 -3.4555E+00 4th order coefficient (A) -1.5607E-01 -1.3030E-01 -1.3425E-02 1.5271E+00 1.5497E+00 -8.4290E-01 -2.9608E+00 6th order coefficient (B) -1.1167E-02 -1.5177E-03 8.2843E-03 -1.4696E-01 -1.9920E-01 2.9598E-01 3.5172E-01 8th order coefficient (C) 2.9914E-03 1.4670E-02 5.8222E-03 -6.2744E-02 -7.0261E-02 -1.6745E-02 -1.7134E-01 10th order coefficient (D) -1.0885E-04 -1.2146E-03 -4.8031E-03 -1.1402E-02 -6.4093E-03 -1.8825E-02 4.2177E-02 12th order coefficient (E) -4.6213E-05 -1.6881E-03 -2.6412E-03 4.2326E-03 1.7440E-02 8.3651E-03 -1.5780E-02 14th order coefficient (F) 1.0206E-05 -6.0396E-05 2.2286E-04 -6.2221E-03 -1.3823E-02 -9.7180E-03 1.1340E-02 16th order coefficient (G) -4.6457E-06 8.7663E-05 2.2712E-04 -3.0597E-03 -8.9005E-03 -1.7524E-02 -5.2748E-03 18th order coefficient (H) 3.2413E-06 2.5221E-05 -8.3249E-06 -5.4639E-04 -1.4801E-03 -1.8180E-02 -6.9838E-03 20th order coefficient (J) -5.1912E-07 -1.5170E-05 -3.5043E-05 -7.6514E-04 -7.3640E-04 -5.6815E-03 3.6034E-03

[0242] Hereinafter, reference will be made to Figures 6A through 6C describe the optical system 600 according to the sixth exemplary embodiment.

[0243] Figure 6A is a cross-sectional view showing the optical system in the first position according to the sixth exemplary embodiment. Figure 6B is a cross-sectional view showing the optical system in the second position according to the sixth exemplary embodiment. Figure 6C depicts a graph showing the aberration characteristics of the optical system according to the sixth exemplary embodiment.

[0244] The optical system 600 may include two lens groups and an image sensor 640. The first lens group 610 may include a first lens 611, a second lens 612, a third lens 613, a fourth lens 614, and a fifth lens 615, and the second lens group 620 may include a sixth lens 621, a seventh lens 622, and an eighth lens 623.

[0245] When the first lens group 610 and the second lens group 620 move in the optical axis direction relative to the image sensor 640, the magnification of the optical system 600 can be changed. The magnification in the first position may be approximately twice the magnification in the second position.

[0246] The focal length may be 13.1 mm in the first position and 22.9 mm in the second position. The F-number may be 2.7 in the first position and 4.7 in the second position. Half of the length of the diagonal of the imaging surface IP of the image sensor 640 may be 7.0132 mm.

[0247] The first lens group 610 may have a positive refractive power, and the second lens group 620 may have a negative refractive power. The focal length of the first lens group 610 may be 11.62 mm, and the focal length of the second lens group 620 may be -15.13 mm.

[0248] The optical system 600 may include an aperture stop ST disposed between a fifth lens 615 and a sixth lens 621. The optical system 600 may include an IR filter 630 disposed between an eighth lens 623 and an image sensor 640. The optical system 600 may include eight lenses having refractive powers. Two lenses adjacent to each other among the lenses of the optical system 600 may be spaced apart from each other in the optical axis direction.

[0249] The first lens 611 may have a positive refractive power. The object side surface of the first lens 611 may be concave in the paraxial region. The image side surface of the first lens 611 may be convex in the paraxial region. The object side surface of the first lens 611 may be aspherical. The image side surface of the first lens 611 may be aspherical.

[0250] The second lens 612 may have a positive refractive power. The object side surface of the second lens 612 may be convex in the paraxial region. The image side surface of the second lens 612 may be concave in the paraxial region. The object side surface of the second lens 612 may be aspherical. The image side surface of the second lens 612 may be aspherical.

[0251] The third lens 613 may have a negative refractive power. The object side surface of the third lens 613 may be concave in the paraxial region. The image side surface of the third lens 613 may be concave in the paraxial region. The object side surface of the third lens 613 may be aspherical. The image side surface of the third lens 613 may be aspherical.

[0252] The fourth lens 614 may have a positive refractive power. The object side surface of the fourth lens 614 may be concave in the paraxial region. The image side surface of the fourth lens 614 may be convex in the paraxial region. The object side surface of the fourth lens 614 may be aspherical. The image side surface of the fourth lens 614 may be aspherical.

[0253] The fifth lens 615 may have a positive refractive power. The object side surface of the fifth lens 615 may be convex in the paraxial region. The image side surface of the fifth lens 615 may be convex in the paraxial region. The object side surface of the fifth lens 615 may be aspherical. The image side surface of the fifth lens 615 may be aspherical.

[0254] The sixth lens 621 may have a positive refractive power. The object side surface of the sixth lens 621 may be concave in the paraxial region. The image side surface of the sixth lens 621 may be convex in the paraxial region. The object side surface of the sixth lens 621 may be aspherical. The image side surface of the sixth lens 621 may be aspherical.

[0255] The seventh lens 622 may have a positive refractive power. The object side of the seventh lens 622 may be concave in the paraxial region. The image side of the seventh lens 622 may be convex in the paraxial region. The object side of the seventh lens 622 may be aspherical. The image side of the seventh lens 622 may be aspherical.

[0256] The eighth lens 623 may have a negative refractive power. The object side of the eighth lens 623 may be concave in the paraxial region. The image side of the eighth lens 623 may be convex in the paraxial region. The object side of the eighth lens 623 may be aspherical. The image side of the eighth lens 623 may be aspherical.

[0257] The object side of the fourth lens 614 may include an inflection point. The object side of the fourth lens 614 may be concave in the paraxial region and may be convex in the outer region of the paraxial region.

[0258] The image side of the seventh lens 622 may include an inflection point.

[0259] The object side of the eighth lens 623 may include an inflection point.

[0260] In the sixth exemplary embodiment, G1_OAL may be 6.862, |1x_f / f3| may be 1.741, |2x_f / f3| may be 3.046, 1xL / 2xL may be 0.74, 1xB / 2xB may be 0.103, and |G1F / G2F| may be 0.768.

[0261] Table 11 lists the optical and physical parameters of the optical system 600 in the sixth exemplary embodiment. Table 12 lists the aspherical data of the optical system 600 in the sixth exemplary embodiment.

[0262] Table 11

[0263]

[0264] Table 12

[0265]

[0266]

[0267] Hereinafter, reference will be made to Figures 7A through 7C describe the optical system 700 according to the seventh exemplary embodiment.

[0268] Figure 7A is a cross-sectional view showing the optical system 700 in the first position according to the seventh exemplary embodiment. Figure 7BFIG. is a cross-sectional view showing the optical system 700 in the second position according to the seventh exemplary embodiment. Figure 7C FIG. depicts a graph showing the aberration characteristics of the optical system 700 according to the seventh exemplary embodiment.

[0269] The optical system 700 may include two lens groups and an image sensor 740. The first lens group 710 may include a first lens 711, a second lens 712, a third lens 713, a fourth lens 714, and a fifth lens 715, and the second lens group 720 may include a sixth lens 721 and a seventh lens 722.

[0270] When the first lens group 710 and the second lens group 720 move in the optical axis direction relative to the image sensor 740, the magnification of the optical system 700 may change. The magnification in the first position may be approximately twice the magnification in the second position.

[0271] The focal length may be 10.4 mm in the first position and 20.2 mm in the second position. The F-number may be 2.3 in the first position and 4.6 in the second position. Half of the length of the diagonal of the imaging surface IP of the image sensor 740 may be 8.166 mm.

[0272] The first lens group 710 may have a positive refractive power, and the second lens group 720 may have a negative refractive power. The focal length of the first lens group 710 may be 8.97 mm, and the focal length of the second lens group 720 may be -10.00 mm.

[0273] The optical system 700 may include an aperture stop disposed between the fifth lens 715 and the sixth lens 721. The optical system 700 may include an IR filter 730 disposed between the seventh lens 722 and the image sensor 740. The optical system 700 may include seven lenses having refractive power. Two adjacent lenses among the lenses of the optical system 700 may be spaced apart from each other in the optical axis direction.

[0274] The first lens 711 may have a negative refractive power. The object side surface of the first lens 711 may be convex in the paraxial region. The image side surface of the first lens 711 may be concave in the paraxial region. The object side surface of the first lens 711 may be aspherical. The image side surface of the first lens 711 may be aspherical.

[0275] The second lens 712 may have a positive refractive power. The object side surface of the second lens 712 may be convex in the paraxial region. The image side surface of the second lens 712 may be concave in the paraxial region. The object side surface of the second lens 712 may be aspherical. The image side surface of the second lens 712 may be aspherical.

[0276] The third lens 713 may have a negative refractive power. The object side surface of the third lens 713 may be concave in the paraxial region. The image side surface of the third lens 713 may be concave in the paraxial region. The object side surface of the third lens 713 may be aspherical. The image side surface of the third lens 713 may be aspherical.

[0277] The fourth lens 714 may have a positive refractive power. The object side surface of the fourth lens 714 may be convex in the paraxial region. The image side surface of the fourth lens 714 may be convex in the paraxial region. The object side surface of the fourth lens 714 may be aspherical. The image side surface of the fourth lens 714 may be aspherical.

[0278] The fifth lens 715 may have a positive refractive power. The object side surface of the fifth lens 715 may be concave in the paraxial region. The image side surface of the fifth lens 715 may be convex in the paraxial region. The object side surface of the fifth lens 715 may be aspherical. The image side surface of the fifth lens 715 may be aspherical.

[0279] The sixth lens 721 may have a positive refractive power. The object side surface of the sixth lens 721 may be concave in the paraxial region. The image side surface of the sixth lens 721 may be convex in the paraxial region. The object side surface of the sixth lens 721 may be aspherical. The image side surface of the sixth lens 721 may be aspherical.

[0280] The seventh lens 722 may have a negative refractive power. The object side surface of the seventh lens 722 may be concave in the paraxial region. The image side surface of the seventh lens 722 may be concave in the paraxial region. The object side surface of the seventh lens 722 may be aspherical. The image side surface of the seventh lens 722 may be aspherical.

[0281] The image side surface of the first lens 711 may include an inflection point.

[0282] The object side surface of the second lens 712 may include an inflection point. The object side surface of the second lens 712 may be convex in the paraxial region and may be concave in the outer region of the paraxial region.

[0283] The image side surface of the third lens 713 may include an inflection point. The image side surface of the third lens 713 may be concave in the paraxial region and may be convex in the outer region of the paraxial region.

[0284] The object side surface of the sixth lens 721 may include an inflection point. The image side surface of the sixth lens 721 may include an inflection point.

[0285] The object side surface of the seventh lens 722 may include an inflection point. The image side surface of the seventh lens 722 may include an inflection point. The image side surface of the seventh lens 722 may be concave in the paraxial region and may be convex in the outer region of the paraxial region.

[0286] In the seventh exemplary embodiment, G1_OAL may be 6.738, |1x_f / f3| may be 1.132, |2x_f / f3| may be 2.196, 1xL / 2xL may be 0.713, 1xB / 2xB may be 0.115, and |G1F / G2F| may be 0.897.

[0287] Table 13 lists the optical and physical parameters of the optical system 700 in the seventh exemplary embodiment. Table 14 lists the aspherical data of the optical system 700 in the seventh exemplary embodiment.

[0288] Table 13

[0289]

[0290]

[0291] Table 14

[0292] Surface number 2 3 4 5 6 7 8 Y radius 9.5069E+01 4.4709E+01 1.0490E+01 1.4768E+01 -1.4225E+01 1.0850E+01 7.3150E+00 Conic constant (K) 9.9000E+01 9.8404E+01 -4.3730E+01 -3.2686E+01 3.5049E+01 -8.9463E+01 -1.1014E+01 4th order coefficient (A) 8.0332E-01 3.3606E-01 -1.8993E-02 -9.9161E-03 -3.5126E-02 -2.2478E-02 -5.4681E-02 6th order coefficient (B) 4.3805E-02 -6.7681E-02 -2.8202E-02 -5.9002E-03 -5.1307E-04 -3.6775E-03 -1.0240E-03 8th order coefficient (C) 5.2151E-03 -7.8612E-03 1.0955E-03 -3.3431E-04 -5.4440E-04 -5.2316E-05 -8.7277E-04 10th order coefficient (D) -8.6819E-04 1.4104E-03 7.2242E-04 1.9765E-04 1.1087E-04 -7.1153E-05 2.1666E-05 12th order coefficient (E) -2.1753E-03 7.2829E-05 1.1081E-04 2.3107E-05 -1.4233E-05 4.4869E-05 2.7837E-05 14th order coefficient (F) -4.9061E-04 4.0814E-04 -3.9319E-05 -3.8904E-06 9.4622E-06 -1.1207E-05 -8.0924E-06 16th order coefficient (G) -2.4421E-04 -2.2666E-05 6.1116E-06 -2.4224E-06 -2.9097E-06 2.4394E-06 4.7237E-06 18th order coefficient (H) -9.4343E-05 -1.0253E-04 -1.8252E-06 9.3625E-07 6.8498E-08 -5.2183E-07 -1.1079E-06 20th order coefficient (J) 3.9891E-05 2.2737E-05 1.8715E-07 -9.1957E-08 9.9071E-08 4.6964E-08 6.6615E-08 Surface number 9 10 11 13 14 15 16 Y radius -9.9275E+00 -9.4935E+00 -4.1741E+00 -6.1652E+00 -4.8293E+00 -6.9199E+00 1.3461E+01 Conic constant (K) 1.0244E+01 6.2199E+00 -1.8878E+00 3.8936E-01 -1.5938E+00 2.9115E-01 -4.5636E+00 4th order coefficient (A) -1.5368E-01 -1.2637E-01 -1.9996E-02 1.5989E+00 1.7526E+00 -1.3132E-01 -2.9760E+00 6th order coefficient (B) -1.1054E-02 5.0470E-04 1.2246E-02 -1.7064E-01 -1.7681E-01 4.2361E-01 2.2264E-01 8th order coefficient (C) 2.6698E-03 1.4803E-02 7.2330E-03 -8.5672E-02 -5.8037E-02 8.0369E-02 -5.2663E-02 10th order coefficient (D) -4.8137E-05 -3.3508E-04 -3.7263E-03 -1.9243E-02 7.2627E-03 -4.2234E-02 5.1517E-02 12th order coefficient (E) -5.5320E-05 -1.4818E-03 -2.6036E-03 -2.9827E-04 2.4172E-02 8.4567E-03 -8.6508E-03 14th order coefficient (F) 9.1808E-06 -1.0599E-04 1.1017E-04 -3.9872E-03 -6.1663E-03 -5.9648E-03 -6.1306E-03 16th order coefficient (G) -6.3876E-06 9.1408E-05 2.1466E-04 -3.1401E-03 -3.8977E-03 1.5894E-03 4.0698E-03 18th order coefficient (H) 3.4472E-06 3.0656E-05 -1.6670E-05 -1.0592E-03 1.6659E-03 -8.2069E-04 -7.4376E-04 20th order coefficient (J) -4.9792E-07 -1.6995E-05 -4.2731E-05 -1.1095E-03 -2.7346E-04 2.3542E-04 5.3248E-03

[0293] According to the above exemplary embodiments, an optical system that provides various magnifications and high resolutions using a single camera can be provided.

[0294] Although specific exemplary embodiments have been shown and described above, it will be apparent after understanding the present disclosure that various changes in form and detail can 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 understood in a descriptive sense only and not for purposes of limitation. The description of the features or aspects in each example should be considered applicable to similar features or aspects in other examples. Appropriate results can still be achieved if the described techniques are performed in a different order, and / or if the 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. Accordingly, the scope of the present disclosure is not limited by the specific embodiments, but is defined by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in the present disclosure.

Claims

1. An optical system, comprising: A first lens group, including a plurality of lenses; And A second lens group, including a plurality of lenses, Wherein, the first lens group and the second lens group are arranged in sequence from the object side, Wherein, each of the first lens group and the second lens group is configured to move between a first position and a second position in the optical axis direction, Wherein, the distance between the first lens group and the second lens group is the largest at the first position, and the distance between the first lens group and the second lens group is the smallest at the second position, Wherein, at least one of the object side surface and the image side surface of the plurality of lenses of the first lens group and the plurality of lenses of the second lens group is aspherical, and Wherein, 1xL is the distance from the object side surface of the lens closest to the object side among the plurality of lenses of the first lens group to the imaging surface at the first position, 2xL is the distance from the object side surface of the lens closest to the object side to the imaging surface at the second position, and 1xL / 2xL is greater than 0.

7.

2. The optical system according to claim 1, wherein 1xL / 2xL is less than or equal to 0.

744.

3. The optical system according to claim 1, wherein, G1_OAL is the distance between the object side vertex of the lens closest to the object side among the plurality of lenses of the first lens group and the image side vertex of the lens closest to the image side among the plurality of lenses of the first lens group, and G1_OAL is less than 10 mm.

4. The optical system according to claim 1, wherein, G1_OAL is greater than or equal to 6.723 mm.

5. The optical system according to claim 1, Among them, The plurality of lenses of the first lens group include a first lens, a second lens, and a third lens arranged in sequence from the object side to the image side, and Wherein, 1 < |1x_f / f3| < 2 is satisfied, where 1x_f is the focal length of the optical system at the first position, and f3 is the focal length of the third lens.

6. The optical system according to claim 1, Among them, The plurality of lenses of the first lens group include a first lens, a second lens, and a third lens arranged in sequence from the object side to the image side, and Wherein, 2 < |2x_f / f3| < 3.8 is satisfied, where 2x_f is the focal length of the optical system at the second position, and f3 is the focal length of the third lens.

7. The optical system according to claim 1, wherein, 1xB / 2xB > 0.1 is satisfied, where 1xB is the distance from the vertex of the image side surface of the lens closest to the image side among the plurality of lenses of the second lens group to the imaging surface at the first position, and 2xB is the distance from the vertex of the image side surface of the lens closest to the image side among the plurality of lenses of the second lens group to the imaging surface at the second position.

8. The optical system according to claim 7, wherein, 0.1 < 1xB / 2xB ≤ 0.166 is satisfied.

9. The optical system according to claim 1, wherein, 0.5 < |G1F / G2F| < 1 is satisfied, where G1F is the focal length of the first lens group, and G2F is the focal length of the second lens group.

10. The optical system according to claim 1, wherein, The first lens group has a positive refractive power, and the second lens group has a negative refractive power.

11. The optical system according to claim 1, wherein, The total number of lenses included in the first lens group and the second lens group is six, seven, or eight.

12. The optical system according to claim 1, wherein, The plurality of lenses of the first lens group includes four or more lenses having refractive power, and the plurality of lenses of the second lens group includes two or more lenses having refractive power.

13. The optical system according to claim 1, wherein, At least one of the object side and the image side of the plurality of lenses of the first lens group and the plurality of lenses of the second lens group includes at least one inflection point.

14. The optical system according to claim 1, wherein, The plurality of lenses of the first lens group includes: a first lens having negative refractive power; a second lens having positive refractive power; a third lens having negative refractive power; a fourth lens having positive refractive power; and a fifth lens having positive refractive power, and the first lens to the fifth lens are arranged in order from the object side to the image side.

15. The optical system according to claim 14, wherein, The plurality of lenses of the second lens group includes a sixth lens having positive refractive power and a seventh lens having negative refractive power arranged in order from the object side to the image side.

16. The optical system according to claim 1, wherein, The plurality of lenses of the first lens group includes: a first lens having positive refractive power; a second lens having negative refractive power; a third lens having positive refractive power; and a fourth lens having positive refractive power, and the first lens to the fourth lens are arranged in order from the object side to the image side.

17. The optical system according to claim 16, wherein, The plurality of lenses of the second lens group includes a fifth lens having positive refractive power and a sixth lens having negative refractive power arranged in order from the object side to the image side.

18. The optical system according to claim 1, wherein, The plurality of lenses of the first lens group includes: a first lens having positive refractive power; a second lens having positive refractive power; a third lens having negative refractive power; a fourth lens having positive refractive power; and a fifth lens having positive refractive power, and the first lens to the fifth lens are arranged in order from the object side to the image side.

19. The optical system according to claim 18, wherein, The plurality of lenses of the second lens group includes: a sixth lens having positive refractive power; a seventh lens having positive refractive power; and an eighth lens having negative refractive power, and the sixth lens to the eighth lens are arranged in order from the object side to the image side.

20. The optical system according to claim 1, further comprising: An aperture stop disposed between the first lens group and the second lens group.

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