Optical system and camera module

Abstract

An optical system according to an embodiment of the present invention comprises first to third lens groups disposed along the optical axis, and an optical path control member disposed between the first lens group and the second lens group, wherein the first lens group has positive (+) refractive power, the second lens group has positive (+) refractive power, and the third lens group has positive (+) refractive power, an object-side surface of a lens disposed closest to an object side in the second lens group on the optical axis has a convex shape, the first lens group and the optical path control member are moved for OIS, and the third lens group is moved for AF.

Description

Optical system and camera module

[0001] The present invention relates to an optical system for enhanced optical performance and a camera module including the same.

[0002] Camera modules perform the function of capturing objects and saving them as images or videos, and are installed in various applications. In particular, camera modules are manufactured in ultra-compact sizes and are applied not only to portable devices such as smartphones, tablet PCs, and laptops, but also to drones and vehicles, providing a wide range of functions.

[0003] For example, the optical system of a camera module may include an imaging lens that forms an image and an image sensor that converts the formed image into an electrical signal. In this case, the camera module can perform an autofocus (AF) function that aligns the focal length of the lens by automatically adjusting the distance between the image sensor and the imaging lens, and can perform a zooming function of zooming up or zooming out by increasing or decreasing the magnification of a distant object through a zoom lens. Additionally, the camera module employs image stabilization (IS) technology to correct or prevent image shaking caused by camera movement resulting from unstable fixed devices or user movements.

[0004] The most important element for such camera modules to obtain an image is the imaging lens that forms the image. Recently, there has been growing interest in high performance, such as high image quality and high resolution, and research is being conducted on optical systems containing multiple lenses to achieve this.

[0005] For example, research is being conducted using multiple imaging lenses with positive (+) or negative (-) refractive power to implement a high-performance optical system. An optical system containing multiple lenses may have a set Effective Focal Length (EFL). In this case, when the value of the Effective Focal Length (EFL) is relatively large, the lens adjacent to the object side has a large aperture or the largest aperture among the multiple lenses. Consequently, since the lens closest to the object side has a relatively large size, there is a problem in that it is difficult to miniaturize the optical system.

[0006] An optical system containing multiple lenses may have a relatively large height. For example, as the number of lenses increases, the distance from the image sensor to the object surface of the lens adjacent to the object may increase. Accordingly, the overall thickness of a device such as a mobile device like a smartphone in which the optical system is placed may increase, and there is a problem that it is difficult to miniaturize.

[0007]

[0008] Camera modules for close-range imaging have a shorter TTL compared to conventional camera modules. As another example, camera modules for long-range imaging have a longer TTL compared to conventional camera modules. However, since portable terminals have limited installation space for camera modules, it is difficult to mount camera modules for long-range imaging or camera modules capable of image magnification adjustment (zoom camera modules). Therefore, a new optical system capable of solving the aforementioned problems is required.

[0009] The present embodiment aims to provide an optical system and a camera module with improved optical characteristics.

[0010] In addition, it is possible to provide an optical system that can be implemented in a small and compact manner.

[0011] Additionally, an optical system can be provided in which the lengths of the first direction and the second direction of at least one lens among the plurality of lenses that is adjacent to the object side or adjacent to the outside of the terminal are different. That is, an optical system can be provided in which at least one or two or more of the lenses have different lengths in two mutually orthogonal axis directions.

[0012] In addition, we aim to provide an optical system applicable to a folded camera or macro mode having a thin thickness or height.

[0013] To solve the above technical problem, an optical system according to an embodiment of the present invention includes first to third lens groups arranged along an optical axis, wherein the first lens group has a positive (+) refractive power, the second lens group has a positive (+) refractive power, the third lens group has a positive (+) refractive power, and includes an optical path control member arranged between the first lens group and the second lens group, wherein the object side of the lens arranged closest to the object side in the second lens group along the optical axis has a convex shape, the first lens group and the optical path control member move in OIS mode, and the third lens group moves in AF mode.

[0014] The first lens group includes a first lens and a second lens, and the object side of the first lens at the optical axis may have a convex shape, and the sensor side of the second lens at the optical axis may have a concave shape.

[0015] The first lens above has a positive (+) refractive power, and

[0016] The above second lens may have negative (-) refractive power.

[0017] The difference in the absolute value of the focal lengths of the first lens and the second lens may be 0.1 or more and 10 or less.

[0018] The above second lens group includes a third lens and a fourth lens, the third lens has a positive (+) refractive power, and the fourth lens may have a negative (-) refractive power.

[0019] The above third lens group includes a fifth lens, a sixth lens, and a seventh lens, wherein the fifth lens has a negative (-) refractive power, the sixth lens has a positive (+) refractive power, and the seventh lens may have a negative (-) refractive power.

[0020] In the above optical axis, the fourth lens may have a meniscus shape that is convex toward the object.

[0021] The lens positioned closest to the object side in the first lens group above may have a meniscus shape that is convex toward the object side.

[0022] The following condition can be satisfied. <Condition> 0.8 < LG3_stroke < 2.5 (In the above condition, LG3 is the stroke length of the third lens group.)

[0023] The following condition can be satisfied. <Condition> 0.3 < TTL / |f1| < 2.5 (In the above condition, TTL is the optical axis distance from the vertex of the object side of the lens positioned closest to the object side of the optical system to the top plane of the image sensor, and f1 is the focal length of the first lens.)

[0024] To solve the above technical problem, an optical system according to another embodiment of the present invention includes first to seventh lenses arranged along an optical axis, wherein the first lens has a positive (+) refractive power, the second lens has a negative (-) refractive power, the third lens has a positive (+) refractive power, the fourth lens has a negative (-) refractive power, the fifth lens has a negative (-) refractive power, the sixth lens has a positive (+) refractive power, and the seventh lens has a negative (-) refractive power, and an optical path control member is disposed between the second lens and the third lens, the first and second lenses and the optical path control member move in OIS mode, and the fifth to seventh lenses move in AF mode.

[0025] The first and second lenses are a first lens group, the third and fourth lenses are a second lens group, and the fifth to seventh lenses are a third lens group, and the first lens group may have a positive (+) refractive power, the second lens group may have a positive (+) refractive power, and the third lens group may have a positive (+) refractive power.

[0026] The difference in the absolute value of the focal lengths of the first lens and the second lens may be 0.1 or more and 10 or less.

[0027] The sensor side of the second lens on the optical axis may have a concave shape, and the object side of the third lens on the optical axis may have a convex shape.

[0028] In the above optical axis, the fourth lens may have a meniscus shape with the object side being convex.

[0029] The optical system and camera module according to the present embodiment have various magnifications and can have excellent optical characteristics when providing various magnifications. Specifically, the embodiment can have various magnifications and provide an autofocus (AF) function for the subject by controlling a set number of lenses, a lens group having refractive power, a plurality of lenses having a set shape and focal length, and a moving distance of a moving lens group.

[0030] In addition, each of the multiple lens groups can correct aberration characteristics or mutually complement aberration characteristics that change due to movement. Accordingly, the optical system according to the embodiment can minimize or prevent changes in chromatic aberration and aberration characteristics that occur when the magnification changes.

[0031] In addition, the effective focal length (EFL) can be controlled by moving only some of the lens groups among multiple lens groups, and the moving distance of the moving lens groups can be minimized. Accordingly, the embodiment can significantly reduce the moving distance of the lens groups when changing the magnification and minimize the power consumption required when moving the lens groups.

[0032] In addition, the optical system according to the present embodiment has enhanced optical characteristics and can have a large BFL (Back focal length), thereby providing an optical system suitable for a folded camera module.

[0033] FIG. 1 is a diagram showing the configuration of an optical system according to the first embodiment of the present invention operating in a first mode.

[0034] FIG. 2 is a configuration diagram of an optical system according to the first embodiment of the present invention operating in a second mode.

[0035] FIG. 3 is a table showing the aspherical coefficients of the lenses in the optical system according to the first embodiment.

[0036] FIG. 4 is a graph showing data on the aberration characteristics of the optical system according to the first embodiment of the present invention operating in the first mode.

[0037] FIG. 5 is a graph showing data on the aberration characteristics of the optical system according to the first embodiment of the present invention operating in a second mode.

[0038] FIG. 6 is a graph showing the relative illumination ratio (Relative Illumination Versus Relative Field) of the optical system according to the first embodiment of the present invention operating in the first mode.

[0039] FIG. 7 is a graph showing the ambient light ratio of the optical system according to the first embodiment of the present invention operating in a second mode.

[0040] FIG. 8 is a configuration diagram of an optical system according to the second embodiment of the present invention operating in a first mode.

[0041] FIG. 9 is a configuration diagram of an optical system according to the second embodiment of the present invention operating in a second mode.

[0042] FIG. 10 is a table showing the aspherical coefficients of lenses in an optical system according to the second embodiment.

[0043] FIG. 11 is a graph showing data on the aberration characteristics of the optical system according to the second embodiment of the present invention operating in the first mode.

[0044] FIG. 12 is a graph showing data on the aberration characteristics of the optical system according to the second embodiment of the present invention operating in a second mode.

[0045] FIG. 13 is a graph showing the relative illumination ratio (Relative Illumination Versus Relative Field) of the optical system according to the second embodiment of the present invention operating in the first mode.

[0046] FIG. 14 is a graph showing the ambient light ratio of an optical system according to the second embodiment of the present invention operating in a second mode.

[0047] FIG. 15 is a diagram showing the configuration of an optical system according to the third embodiment of the present invention operating in a first mode.

[0048] FIG. 16 is a diagram showing the configuration of an optical system according to the third embodiment of the present invention operating in a second mode.

[0049] FIG. 17 is a table showing the aspherical coefficients of lenses in an optical system according to the third embodiment.

[0050] FIG. 18 is a graph showing data on the aberration characteristics of the optical system according to the third embodiment of the present invention operating in the first mode.

[0051] FIG. 19 is a graph showing data on the aberration characteristics of the optical system according to the third embodiment of the present invention operating in a second mode.

[0052] FIG. 20 is a graph showing the relative illumination ratio (Relative Illumination Versus Relative Field) of the optical system according to the third embodiment of the present invention operating in the first mode.

[0053] FIG. 21 is a graph showing the ambient light ratio of an optical system according to the third embodiment of the present invention operating in a second mode.

[0054] FIG. 22 is a diagram of the configuration of an optical system according to the fourth embodiment of the present invention operating in a first mode.

[0055] FIG. 23 is a configuration diagram of an optical system according to the fourth embodiment of the present invention operating in a second mode.

[0056] FIG. 24 is a table showing the aspherical coefficients of lenses in an optical system according to the fourth embodiment.

[0057] FIG. 25 is a graph showing data on the aberration characteristics of the optical system according to the fourth embodiment of the present invention operating in the first mode.

[0058] FIG. 26 is a graph showing data on the aberration characteristics of the optical system according to the fourth embodiment of the present invention operating in the second mode.

[0059] FIG. 27 is a graph showing the relative illumination ratio (Relative Illumination Versus Relative Field) of the optical system according to the fourth embodiment operating in the first mode.

[0060] FIG. 28 is a graph showing the ambient light ratio of an optical system according to the fourth embodiment of the present invention operating in a second mode.

[0061] FIG. 29 is a drawing for explaining the D-cut lens of the present invention.

[0062] FIG. 30 is an example of a portable terminal having an optical system according to the present embodiment.

[0063] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0064] However, the technical concept of the present invention is not limited to the first to fourth embodiments described herein but can be implemented in various different forms, and within the scope of the technical concept of the present invention, one or more of the components of the first to fourth embodiments may be selectively combined or substituted.

[0065] In addition, terms used in the first to fourth embodiments (including technical and scientific terms) may be interpreted in a meaning that is generally understood by those skilled in the art to which the first to fourth embodiments belong, unless explicitly and specifically defined otherwise. Terms that are commonly used, such as terms defined in advance, may be interpreted in consideration of their meaning in the context of the relevant technology.

[0066] Furthermore, the terms used in the first to fourth embodiments are intended to describe the first to fourth embodiments and are not intended to limit the invention.

[0067] In this specification, the singular form may include the plural form unless specifically stated otherwise in the text, and when described as "at least one of A and B and C (or more than one)," it may include one or more of all combinations that can be formed from A, B, and C.

[0068] In addition, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the first to fourth embodiments. These terms are used merely to distinguish the components from other components and are not intended to limit the essence, order, or sequence of the components.

[0069] And, where it is stated that a component is 'connected', 'combined', or 'connected' to another component, this may include not only cases where the component is directly 'connected', 'combined', or 'connected' to the other component, but also cases where it is 'connected', 'combined', or 'connected' due to another component located between the component and the other component.

[0070] Furthermore, when described as being formed or placed "above" or "below" each component, "above" or "below" includes not only cases where two components are in direct contact with each other, but also cases where one or more other components are formed or placed between the two components. Additionally, when expressed as "above" or "below," it may include the meaning of a downward direction as well as an upward direction relative to a single component.

[0071] In the description of the invention, "object side" may refer to a surface of the lens facing the object side with respect to the optical axis (OA), and "sensor side" may refer to a surface of the lens facing the imaging surface (image sensor) with respect to the optical axis. "Object side" may be the "object side," and "sensor side" may be the "image side." One surface of the lens being convex may refer to a convex shape in the optical axis or paraxial region, and one surface of the lens being concave may refer to a concave shape in the optical axis or paraxial region. The radius of curvature, center thickness, and optical axis spacing between lenses listed in the lens data table may refer to values ​​(unit, mm) in the optical axis. The vertical direction may refer to a direction perpendicular to the optical axis, and the end of the lens or lens surface may refer to the end of the effective area of ​​the lens through which incident light passes. The size of the effective diameter of the lens surface may have a measurement error of up to ±0.4 mm depending on the measurement method, etc. The above paraxial region refers to a very narrow region near the optical axis, and is a region where the distance of light rays from the optical axis (OA) is almost zero. Hereinafter, the term optical axis may include the center of each lens or a very narrow region near the optical axis.

[0072] The optical axis (OA) may refer to the central axis on the path of light where light incident from the second direction (Y-axis direction) is bent into the first direction (X-axis direction) by the optical path control member (111, 211, 311, 411).

[0073]

[0074] The optical system (1000, 1100, 1200, 1300) according to the first to fourth embodiments may include a plurality of lens groups. Specifically, the optical system (1000, 1100, 1200, 1300) may include a plurality of lens groups, each including at least one lens. For example, the optical system (1000, 1100, 1200, 1300) may include a first lens group (LG1), an optical path control member (111, 211, 311, 411), a second lens group (LG2), a third lens group (LG3), and an image sensor (500) arranged sequentially from the object side toward the image sensor.

[0075] The first to third lens groups (LG1, LG2, LG3) may each have a positive (+) or negative (-) refractive power. The first to third lens groups (LG1, LG2, LG3) may have refractive powers of different signs. For example, in the first to third embodiments, the first lens group (LG1) to the third lens group (LG3) may have a positive (+) refractive power, and in the fourth embodiment, the first lens group (LG1) and the second lens group (LG2) may have a positive (+) refractive power, and the third lens group (LG3) may have a negative (-) refractive power.

[0076] At least one of the first lens group (LG1) to the third lens group (LG3) may be provided to be movable in the direction of the optical axis (OA). For example, the third lens group (LG3) may be provided to be movable in the direction of the optical axis (OA), while the first lens group (LG1) and the second lens group (LG2) may be fixed.

[0077]

[0078] A plurality of lenses included in the first lens group (LG1) may have a set spacing. Specifically, the spacing between the plurality of lenses included in the first lens group (LG1) may remain constant and not change in the operation mode described later. For example, the spacing between the first lens (101, 201, 301, 401) and the second lens (102, 202, 302, 402) may remain constant and not change according to the operation mode described later.

[0079]

[0080] An optical path control member (111, 211, 311, 411) may be disposed on the sensor side of the first lens group (LG1). By including the optical path control member (111, 211, 311, 411), the optical system (1000, 1100, 1200, 1300) can reduce the thickness in the first direction (X-axis direction) and the second direction (Y-axis direction) of the optical system (1000, 1100, 1200, 1300). If the optical system (1000, 1100, 1200, 1300) does not include the optical path control member (111, 211, 311, 411), a plurality of lenses within the optical device including the optical system (1000, 1100, 1200, 1300) may be disposed extending in a direction perpendicular to the surface of the optical device.

[0081] Accordingly, multiple lenses have a high height in a direction perpendicular to the surface of the optical device, and it may be difficult to form the thickness of the optical device into an ultra-thin form. A prism lens can change light incident perpendicular to the plane of the optical device into a direction parallel to the surface of the optical device. That is, multiple lenses included in the optical system (1000, 1100, 1200, 1300) can be arranged to extend in a direction parallel to the surface of the optical device, and the optical device can be formed with a thin thickness.

[0082] A driving member (not shown) may be connected to an optical path control member (111, 211, 311, 411) including a prism lens. The driving member may move the first lens group (LG1) and the optical path control member (111, 211, 311, 411) using the driving force of an actuator. For example, the driving member may tilt the first lens group (LG1) and the optical path control member (111, 211, 311, 411) along a first axis (X-axis) or a second axis (Y-axis). Accordingly, the camera module (1520) can correct shake. Here, shake correction may refer to an OIS (Optical Image Stabilization) correction function or OIS driving. OIS driving is defined as a function that moves or tilts one or more of the lens, prism, and image sensor in a direction perpendicular to the optical axis or rolls them around the optical axis to cancel out hand shake in order to prevent the image or video from shaking due to the user's hand shake.

[0083] When the first lens group (LG1) and the optical path control member (111, 211, 311, 411) are tilt-controlled, the optical path passing through the optical system may change, and a decrease in resolution may occur as a result. To solve this problem, the distance on the optical axis between the optical path control member (111, 211, 311, 411) and the lens positioned closest to the object side in the second lens group (LG2) may be about 2 mm or less. Additionally, among the light emitted from the optical path control member (111, 211, 311, 411) and incident on the lens positioned closest to the object side of the second lens group (LG2), the light located at the outermost edge may be designed to be parallel to the optical axis. At this time, the light located at the outermost edge may be light reaching the center of the image sensor.

[0084] In order for the light located at the outermost edge to be parallel to the optical axis, the absolute value of the focal length of the first lens group (LG1) may be 100 or more. The signs of the focal lengths of the first lens (101, 201, 301) and the second lens (102, 202, 302) included in the first lens group (LG1) are different from each other, and the absolute value of the difference in focal lengths between the two lenses may be 10 or less.

[0085] That is, the gap between the optical path control member (111, 211, 311, 411) and the second lens group (LG2) is set small, and the optical path incident on the optical path control member (111, 211, 311, 411) and the second lens group (LG2) is designed to be parallel to the optical axis, thereby reducing the effect of optical path tilt caused by OIS driving and minimizing the degradation of optical performance.

[0086] The driving member may include at least one actuator. For example, the driving member may include at least one of a Voice Coil Motor (VCM), a Piezo-electric device, a shape memory alloy, or a MEMS device as the actuator.

[0087] It includes a detection unit (not shown) for detecting shaking of the camera module (1520), and the detection unit can detect rotation and position changes applied to the camera module (1520). The detection unit may include at least one of a sensor that detects changes in angular velocity, for example, a gyro sensor, and an acceleration sensor that detects changes in acceleration.

[0088] The camera module (1520) can control the movement of the prism lens by a control signal. Specifically, if shaking occurs in the camera module (1520), information regarding the shaking, such as the degree of rotation and position change of the sensors, can be detected, and correction for the shaking can be performed. Here, shaking correction may refer to the operation of OIS (Optical Image Stabilization).

[0089] Accordingly, the camera module (1520) according to the first to fourth embodiments can effectively correct shaking caused by rotation and shaking caused by changes in position when photographing a subject located at infinity or macro distance. Therefore, the camera module (1520) can have improved optical characteristics.

[0090]

[0091] The second lens group (LG2) may include multiple lenses. Specifically, the second lens group (LG2) may include two or more lenses having opposite refractive powers. The number of lenses included in the second lens group (LG2) may be equal to the number of lenses included in the first lens group (LG1). For example, the second lens group (LG2) may include two lenses.

[0092] Multiple lenses included in the second lens group (LG2) may have a set spacing. Specifically, the spacing between multiple lenses included in the second lens group (LG2) may remain constant and not change in the operation mode described later. For example, the spacing between the third lens (103, 203, 303, 403) and the fourth lens (104, 204, 304, 404) may remain constant and not change according to the operation mode described later.

[0093]

[0094] The third lens group (LG3) may include multiple lenses. Specifically, the third lens group (LG3) may include three or more lenses having opposite refractive powers. The number of lenses included in the third lens group (LG3) may be greater than the number of lenses included in the second lens group (LG2). For example, the third lens group (LG3) may include three lenses.

[0095] Multiple lenses included in the third lens group (LG3) may have set spacing. Specifically, the spacing between multiple lenses included in the third lens group (LG3) may remain constant without changing in the operation mode described later. For example, the spacing between the fifth lens (105, 205, 305, 405) and the sixth lens (106, 206, 306, 406), and the spacing between the sixth lens (106, 206, 306, 406) and the seventh lens (107, 207, 307, 407) may remain constant without changing according to the operation mode described later.

[0096] The third lens group (LG3) may be a moving group. The third lens group (LG3) may be a moving group that moves for AF driving. When the camera module (1520) changes from a mode of shooting an object located at infinity to a mode of shooting an object located at a macroscopic distance (e.g., within 200mm), the third lens group (LG3) may move in a direction away from the image sensor (300) on the optical axis.

[0097]

[0098] The optical system (1000, 1100, 1200, 1300) may include a first lens group (LG1), an optical path control member (111, 211, 311, 411), a second lens group (LG2), a third lens group (LG3), and an image sensor (500) arranged sequentially from the object side toward the sensor. Additionally, the optical system (1000, 1100, 1200, 1300) may include a plurality of lenses included in lens groups (LG1, LG2, LG3), for example, a first lens (101, 201, 301, 401), a second lens (102, 202, 302, 402), a third lens (103, 203, 303, 403), a fourth lens (104, 204, 304, 404), a fifth lens (105, 205, 305, 405), a sixth lens (106, 206, 306, 406), and a seventh lens (107, 207, 307, 407).

[0099] The first lens group (LG1) may include a first lens (101, 201, 301, 401) and a second lens (102, 202, 302, 402). The second lens group (LG2) may include a third lens (103, 203, 303, 403) and a fourth lens (104, 204, 304, 404). The third lens group (LG3) may include a fifth lens (105, 205, 305, 405), a sixth lens (106, 206, 306, 406), and a seventh lens (107, 207, 307, 407). The first to seventh lenses (101~107, 201~207, 301~307, 401~407) and the image sensor (500) can be sequentially arranged along the optical axis (OA) of the optical system (1000, 1100, 1200, 1300).

[0100] The first lens (101, 201, 301, 401) positioned closest to the object side in the first lens group (LG1) and the third lens (103, 203, 303, 403) positioned closest to the object side in the second lens group (LG2) can have positive (+) refractive power and can act as a light gatherer. On the optical axis, the object side (S1) of the first lens (101, 201, 301, 401) and the object side (S5) of the third lens (103, 203, 303, 403) can have a convex shape. Since the first lens (101, 201, 301, 401) and the third lens (103, 203, 303, 403) are the first lenses to which incident light enters each lens group, they can be made of a glass material that is not sensitive to temperature changes. The sensor side (S4) of the second lens (102, 202, 302, 402) positioned on the object side of the optical path control member (111, 211, 311, 411) may have a concave shape on the optical axis. Through this, interference between the optical path control member (111, 211, 311, 411) and the second lens (102, 202, 302, 402) can be prevented when the first lens group (LG1) and the optical path control member (111, 211, 311, 411) tilt according to OIS driving.

[0101]

[0102] Each of the plurality of lenses (100) may include an effective region and a non-effective region. The effective region may be a region through which light incident on each of the first to seventh lenses (101~107, 201~207, 301~307, 401~407) passes. That is, the effective region may be a region where the incident light is refracted to realize optical characteristics.

[0103] The non-effective region may be positioned around the perimeter of the effective region. The non-effective region may be an area where light is not incident. In other words, the non-effective region may be an area unrelated to optical properties. Additionally, the non-effective region may be an area fixed to a barrel (not shown), etc., that accommodates the lens. The entire lens area, including the effective and non-effective regions, may be referred to as the diameter of the lens.

[0104] The ratio (P / L) of the diameter (P) of the optical path control member (111, 211, 311) and the diameter (L) of the lens positioned closest to the object side in the second lens group (LG2) can satisfy 1.1 to 1.3. When the above conditions are satisfied, it can have a flare reduction effect and a size advantageous for OIS tilt driving. If it is below the lower limit of the above conditions, the flare reduction effect may decrease. If it exceeds the upper limit of the above conditions, the weight and size of the optical path control member increase, which is disadvantageous for OIS tilt driving including the optical path control member.

[0105] Referring to FIG. 29, at least one of the first to seventh lenses (101~107, 201~207, 301~307, 401~407) in the optical system (1000, 1100, 1200, 1300) according to the first to fourth embodiments may have a D-cut technique applied. When the D-cut technique is applied, the height of the entire optical system may be reduced by cutting off a portion of the lens effective diameter or rib. Here, the height of the entire optical system may refer to the length in a direction perpendicular to the optical axis, rather than the TTL. The D-cut lens may have a non-circular shape, and the length (A) in the first direction (X-axis direction) and the length (B) in the second direction (Y-axis direction) may be different.

[0106]

[0107] The image sensor (500) can detect light. The image sensor (500) can detect light that has passed through a plurality of lenses, for example, first to seventh lenses (101 to 107, 201 to 207, 301 to 307, 401 to 407) in sequence. The image sensor (500) may include a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS), etc.

[0108] The optical system (1000, 1100, 1200, 1300) may further include a filter (600). The filter (600) may be placed between a plurality of lenses and an image sensor (500). The filter (600) may be placed between the image sensor (500) and the third lens group (LG3) that is closest to the image sensor (500) among a plurality of lens groups (LG1, LG2, LG3). For example, the filter (600) may be placed between the image sensor (500) and the seventh lens (107, 207, 307, 407), which is the last lens of the third lens group (LG3) closest to the image sensor (500) among the plurality of lenses.

[0109] The filter (600) may include at least one of an optical filter, such as an infrared filter or a cover glass. The filter (600) may pass light of a set wavelength band and filter light of a different wavelength band. If the filter (600) includes an infrared filter, it may block radiant heat emitted from external light from being transmitted to the image sensor (500). Additionally, the filter (600) may transmit visible light and reflect infrared light.

[0110] The optical system (1000, 1100, 1200, 1300) may include an aperture (not shown). The aperture can control the amount of light incident on the optical system (1000, 1100, 1200, 1300). The aperture may be located in front of the first lens (101, 201, 301, 401) or positioned between two lenses selected from the first to seventh lenses (101~107, 201~207, 301~307, 401~407). Additionally, at least one lens among the first to seventh lenses (101~107, 201~207, 301~307, 401~407) may function as an aperture. For example, the object side or sensor side of one of the first to seventh lenses (101~107, 201~207, 301~307, 401~407) selected can function as an aperture to control the amount of light.

[0111]

[0112] The optical system according to the first embodiment of the invention will be described.

[0113] FIG. 1 is a configuration diagram of an optical system according to the first embodiment of the present invention operating in a first mode, FIG. 2 is a configuration diagram of an optical system according to the first embodiment of the present invention operating in a second mode, FIG. 3 is a table showing the aspherical coefficients of lenses in an optical system according to the first embodiment of the present invention, FIG. 4 is a graph showing data on the aberration characteristics of an optical system according to the first embodiment of the present invention operating in a first mode, FIG. 5 is a graph showing data on the aberration characteristics of an optical system according to the first embodiment of the present invention operating in a second mode, FIG. 6 is a graph showing the relative illumination ratio (Relative Illumination Versus Relative Field) of an optical system according to the first embodiment of the present invention operating in a first mode, and FIG. 7 is a graph showing the relative illumination ratio of an optical system according to the first embodiment of the present invention operating in a second mode.

[0114] Referring to FIG. 1, the optical system (1000) includes a lens portion, and the lens portion may include first to seventh lenses (101 to 107). The first to seventh lenses (101 to 107) may be arranged sequentially along the optical axis (OA) of the optical system (1000). Light corresponding to information about an object may pass through the first to seventh lenses (101 to 107) and a filter (600) and be incident on an image sensor (500). The optical axis (OA) may refer to the central axis of light incident from the first lens (101) to the image sensor (500).

[0115]

[0116] The first lens (101) may be positioned closest to the object side. The first lens (101) may be positioned furthest from the sensor side. The first lens (101) may have a positive (+) refractive power at the optical axis (OA). The first lens (101) may include plastic or glass material. For example, the first lens (101) may be provided with glass material.

[0117] With respect to the optical axis (OA), the first surface (S1) on the object side of the first lens (101) may be convex, and the second surface (S2) on the sensor side may be convex. The first lens (101) may have a shape with both sides convex. The first lens (101) may be made of glass material and may have a spherical surface. The first lens (101) may be made of plastic material and may have an aspherical surface. The aspherical coefficients of the first surface (S1) and the second surface (S2) may be provided as L1S1 and L1S2 of FIG. 3. At least one or both of the first surface (S1) and the second surface (S2) of the first lens (101) may be provided without a critical point from the optical axis to the end of the effective area.

[0118]

[0119] The second lens (102) may be positioned second from the object side. The second lens (102) may be positioned seventh from the sensor side. The second lens (102) may be positioned between the first lens (101) and the optical path control member (111). The second lens (102) may have a negative (-) refractive power. The second lens (102) may include plastic or glass material. For example, the second lens (102) may be provided with plastic material.

[0120] With respect to the optical axis, the object-side third surface (S3) of the second lens (102) may be concave, and the sensor-side fourth surface (S4) may be concave. The second lens (102) may have a shape with both sides concave. The second lens (102) may be made of plastic material and may have an aspherical surface. The aspherical coefficients of the third surface (S3) and the fourth surface (S4) may be provided as L2S1 and L2S2 of FIG. 3. At least one or both of the third surface (S3) and the fourth surface (S4) of the second lens (102) may be provided without a threshold point from the optical axis to the end of the effective area.

[0121]

[0122] The optical path control member (111) may be positioned on the sensor side of the second lens (102). The optical path control member (111) may include plastic or glass material. For example, the optical path control member (111) may be provided with glass material. The object-side incident surface (P1) and the sensor-side exit surface (P2) of the optical path control member (111) may be formed as flat surfaces.

[0123] The optical path control member (111) may be a prism lens. The optical path control member (111) may be a right-angle prism lens. The optical path control member (111) may change the path of light incident from the outside. The optical path control member (111) may include a mirror and a prism. The optical path control member (111) may rotate the optical path by 90°. The optical path control member (111) includes an incident surface (P1) into which light is incident, a reflective surface (RS1) that reflects the incident light, and an exit surface (P2) that emits the reflected light. The reflective surface (RS1) has an inclination angle of 45° and reflects the main ray of the incident light by 90°, thereby serving to reflect the incident light to the third lens (103). The light path control member (111) can change the path of light to the first direction (X-axis direction) by reflecting light incident in the second direction (Y-axis direction).

[0124]

[0125] The third lens (103) may be positioned as the fourth lens from the object side. The third lens (103) may be positioned as the fifth lens from the sensor side. The third lens (103) may be positioned between the optical path control member (111) and the fourth lens (104). The third lens (103) may have a positive (+) refractive power on the optical axis (OA). The third lens (103) may include plastic or glass material. For example, the third lens (103) may be provided with glass material.

[0126] With respect to the optical axis, the object-side fifth surface (S5) of the third lens (103) may be convex, and the sensor-side sixth surface (S6) may be concave. The third lens (103) may have a meniscus shape with the object side being convex. The third lens (103) may have a meniscus shape with the sensor side being concave. The third lens (103) may be made of glass and may have a spherical surface. The third lens (103) may be made of plastic and may have an aspherical surface. The aspherical coefficients of the fifth surface (S5) and the sixth surface (S6) may be provided as L3S1 and L3S2 of FIG. 3. At least one or both of the fifth surface (S5) and the sixth surface (S6) of the third lens (103) may be provided without a critical point from the optical axis to the end of the effective area.

[0127]

[0128] The fourth lens (104) may be positioned as the fifth lens from the object side. The fourth lens (104) may be positioned as the fourth lens from the sensor side. The fourth lens (104) may be positioned between the third lens (103) and the fifth lens (105). The fourth lens (104) may have negative (-) refractive power. The fourth lens (104) may include plastic or glass material. For example, the fourth lens (104) may be provided with plastic material.

[0129] With respect to the optical axis, the object-side 7th surface (S7) of the 4th lens (104) may be concave, and the sensor-side 8th surface (S8) may be concave. The 4th lens (104) may have a shape with both sides concave. The 4th lens (104) may be made of plastic material and may have an aspherical surface. The aspherical coefficients of the 7th surface (S7) and the 8th surface (S8) may be provided as L4S1 and L4S2 of FIG. 3. At least one or both of the 7th surface (S7) and the 8th surface (S8) of the 4th lens (104) may be provided without a threshold point from the optical axis to the end of the effective area.

[0130]

[0131] The fifth lens (105) may be positioned as the sixth lens from the object side. The fifth lens (105) may be positioned as the third lens from the sensor side. The fifth lens (105) may be positioned between the fourth lens (104) and the sixth lens (106). The fifth lens (105) may have a negative (-) refractive power. The fifth lens (105) may include plastic or glass materials. For example, the fifth lens (105) may be provided with a plastic material.

[0132] With respect to the optical axis (OA), the fifth lens (105) may have a convex ninth surface (S9) on the object side and a concave tenth surface (S10) on the sensor side. The fifth lens (105) may have a meniscus shape with the object side being convex. The fifth lens (105) may have a meniscus shape with the sensor side being concave. The fifth lens (105) is made of plastic material and may have an aspherical surface. The aspherical coefficients of the ninth surface (S9) and the tenth surface (S10) may be provided as L5S1 and L5S2 of FIG. 3. At least one or both of the ninth surface (S9) and the tenth surface (S10) of the fifth lens (105) may be provided without a critical point from the optical axis to the end of the effective area.

[0133]

[0134] The sixth lens (106) may be positioned as the seventh lens from the object side. The sixth lens (106) may be positioned as the second lens from the sensor side. The sixth lens (106) may be positioned between the fifth lens (105) and the seventh lens (107). The sixth lens (106) may have a positive (+) refractive power. The sixth lens (106) may include plastic or glass materials. For example, the sixth lens (106) may be provided with a plastic material.

[0135] With respect to the optical axis (OA), the 6th lens (106) may have a convex 9th surface (S9) on the object side and a convex 10th surface (S10) on the sensor side. The 6th lens (106) may have a shape with both sides convex. The 6th lens (106) may be made of plastic material and may have an aspherical surface. The aspherical coefficients of the 11th surface (S11) and the 12th surface (S12) may be provided as L6S1 and L6S2 of FIG. 3. The 11th surface (S11) of the 6th lens (106) may be provided without a critical point from the optical axis to the end of the effective area.

[0136] The twelfth surface (S12) of the sixth lens (106) may have a critical point from the optical axis to the end of the effective area. When the twelfth surface (S12) has a critical point, it may be located in the range of 70% to 80% of the effective radius from the optical axis, preferably in the range of 78% to 80%. For example, the critical point of the twelfth surface (S12) may be located at approximately 79% of the effective radius from the optical axis. The critical point of the twelfth surface (S12) is a point where the sign of the slope value with respect to the optical axis and the direction perpendicular to the optical axis changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean a point where the slope value is 0. Additionally, the critical point of the twelfth surface (S12) may be a point where the slope value of the tangent line passing through the lens surface increases and then decreases, or decreases and then increases.

[0137]

[0138] The seventh lens (107) may be positioned furthest from the object side. The seventh lens (107) may be positioned closest to the sensor side. The seventh lens (107) may have negative (-) refractive power. The seventh lens (107) may include plastic or glass material. For example, the seventh lens (107) may be provided with plastic material.

[0139] With respect to the optical axis (OA), the 7th lens (107) may have a concave 13th surface (S13) on the object side and a convex 14th surface (S14) on the sensor side. The 7th lens (107) may have a meniscus shape with the object side being concave. The 7th lens (107) may have a meniscus shape with the sensor side being convex. The 7th lens (107) may be made of plastic material and may have an aspherical surface. The aspherical coefficients of the 13th surface (S13) and the 14th surface (S14) may be provided as L7S1 and L7S2 of FIG. 3. At least one or both of the 13th surface (S13) and the 14th surface (S14) of the 7th lens (107) may be provided without a critical point from the optical axis to the end of the effective area.

[0140]

[0141] LensSurfaceRadiusThicknessndvdClearAperture1S19.5991.5001.54944.7646.940 S2-66.9740.416 6.7712S3-104.3431.1621.58632.5276.512 S49.3921.022 5.997prism1P1 6.800 6.800 P2 0.690 9.3323S55.1931.5001.53655.6995.823 S6155.9660.440 5.6064S7-100.0001.5001.56038.7295.260 S85.742 Variable (D1) 4.5005S93.7191.1471.53754.9276.580 S102.6050.689 6.5306S115.3001.2431.53655.6996.308 S12-9.8011.340 6.2057S13-2.3900.9011.58829.1666.199 S14-3.487Variable (D2) 6.583Filter 0.210 7.399 0.300 7.416image 7.463

[0142] Table 1 shows the surface number, radius of curvature, thickness of the center of each lens or distance between lens surfaces, index, nd, Abbe number (Abbe,vd), clear aperture, and focal length of the lens according to the first embodiment of the present invention. At this time, the units of the radius of curvature and the thickness or distance may be mm.

[0143] In Table 1, the thickness of the optical path control member (111) may refer to the thickness along the optical axis (OA). For example, the thickness of the optical path control member (111) may refer to the sum of the thickness from the incident surface (P1) to the reflection surface (RS1) along the y-axis and the thickness from the reflection surface (RS1) to the exit surface (P2) along the x-axis. Additionally, the thickness from the incident surface (P1) to the reflection surface (RS1) along the y-axis of the optical path control member (111) and the thickness from the reflection surface (RS1) to the exit surface (P2) along the x-axis of the optical path control member (111) may be the same. According to a variation, the thickness from the incident surface (P1) to the reflection surface (RS1) along the y-axis of the optical path control member (111) and the thickness from the reflection surface (RS1) to the exit surface (P2) along the x-axis of the optical path control member (111) may be different.

[0144] Although not listed in Table 1, if the optical path control member (111) is a prism lens, it may have a refractive index and an Abbe number depending on the material forming the prism lens. The optical path control member (111) may be a mirror as the optical path control member.

[0145]

[0146] 1st Mode 2nd Mode D13.9951.693D25.6447.947

[0147] Table 2 relates to the distance between lenses (D1, D2) that varies when operating in either the first mode or the second mode in the optical system according to the first embodiment of the present invention. Here, the first mode refers to the case of photographing an object located at infinity, and the second mode may refer to the case of photographing an object located at a macroscopic distance (e.g., within 200 mm).

[0148] In the optical system according to the first embodiment, the distance between adjacent lens groups may change during the process of changing from the first mode to the second mode. The third lens group (LG3) may move, while the first lens group (LG1) and the second lens group (LG2) may be fixed. The third lens group (LG3) may be a moving group, and the first lens group (LG1) and the second lens group (LG2) may be fixed groups.

[0149] When operating from the first mode to the second mode, the distance (D1) between the second lens group (LG2) and the third lens group (LG3) may decrease, and the distance (D2) between the third lens group (LG3) and the image sensor (500) may increase. When operating from the second mode to the first mode, the distance (D1) between the second lens group (LG2) and the third lens group (LG3) may increase, and the distance (D2) between the third lens group (LG3) and the image sensor (500) may decrease. The stroke length of the third lens group (LG3) may satisfy 2.0 mm to 2.5 mm, and preferably, may satisfy about 2.302 mm. As the third lens group (LG3) moves, the optical performance of the optical system (1000) may change.

[0150]

[0151] EFL(f)19.500FOV20.298LG3_stroke2.302BFL_15.644f115.403BFL_27.947f2-14.657EPD6.940f39.993ET10.755f4-9.651ET21.726f5-25.312ET30.667f66.611ET41.997f7-18.575ET50.868f_LG1189.240ET60.618f_LG247.972ET71.207f_LG319.316TD_LG13.078CA_Max6.856TD_LG23.440CA_Min4.880TD_LG39.315CA_Aver6.130L_CT_max1.500ΣCT8.953L_CT_min0.901TTL30.500L_CT_aver1.279Fno2.810ImgH7.463

[0152] Table 3 relates to the items of the mathematical formulas described above in the optical system (1000) of the first embodiment, including the effective focal length (EFL(F)(mm)) of the optical system (1000), the size of the entrance pupil (EPD(mm)), the distance from the sensor side of the last lens to the image sensor in the first mode (BFL_1(mm)), the distance from the sensor side of the last lens to the image sensor in the second mode (BFL_2(mm)), the angle of view (FOV(degree)), the focal lengths (f1~f7)(mm) of the first to seventh lenses (101~107), the edge thicknesses (ET1~ET7), the length of each lens group in the optical axis direction (TD_LG1, TD_LG2, TD_LG3), the focal lengths (f_LG1, f_LG2, f_LG3)(mm) of the first to third lens groups (LG1, LG2, LG3), and from the first lens (101). This relates to the optical axis distance (TD(mm)) to the 7th lens (107), the stroke length (LG3_stroke) of the 3rd lens group (LG3), the total optical axis distance of the optical system (1000) TTL(mm), ImgH(mm), the maximum effective diameter (CA_Max), the minimum effective diameter (CA_Min), the average effective diameter (CA_Aver), the maximum center thickness (L_CT_max), the minimum center thickness (L_CT_min), the average center thickness (L_CT_aver), the F-number (Fno), etc. among the 1st to 7th lenses (101~107).

[0153]

[0154] In the following, the center thickness of the first to seventh lenses (101 to 107) is denoted as CT1 to CT7, the edge thickness of the effective area of ​​each lens is denoted as ET1 to ET7, and the center gap between two adjacent lenses is denoted as CG1 to CG6. BFL (Back focal length) is the optical axis distance from the image sensor (500) to the center of the last lens. TTL is the optical axis distance from the center of the first surface (S1) of the first lens (101) to the top surface of the image sensor (500). In the following, the description of the relationship between the optical path control members (111) is partially omitted.

[0155]

[0156] When comparing the absolute values ​​of the radius of curvature of each lens, the radius of curvature of the 6th surface (S6) of the third lens (103) at the optical axis (OA) may be the maximum among the lenses, and the radius of curvature of the 13th surface (S13) of the seventh lens (107) may be the minimum among the lenses. The absolute value of the radius of curvature of the 1st surface (S1) of the first lens (101) may be smaller than the absolute value of the radius of curvature of the 2nd surface (S2). The absolute value of the radius of curvature of the 3rd surface (S3) of the second lens (102) may be larger than the absolute value of the radius of curvature of the 4th surface (S4). The absolute value of the radius of curvature of the 5th surface (S5) of the third lens (103) may be smaller than the absolute value of the radius of curvature of the 6th surface (S6). The absolute value of the radius of curvature of the 7th surface (S7) of the 4th lens (104) may be greater than the absolute value of the radius of curvature of the 8th surface (S8). The absolute value of the radius of curvature of the 9th surface (S9) of the 5th lens (105) may be greater than the absolute value of the radius of curvature of the 10th surface (S10). The absolute value of the radius of curvature of the 11th surface (S11) of the 6th lens (106) may be smaller than the absolute value of the radius of curvature of the 12th surface (S12). The absolute value of the radius of curvature of the 13th surface (S13) of the 7th lens (107) may be smaller than the absolute value of the radius of curvature of the 14th surface (S14).

[0157] The ratio of the radius of curvature of each lens can satisfy the following conditions.

[0158] Condition 1: 0.1 < |L1R1 / L1R2| < 0.5

[0159] Condition 2: 10 < |L2R1 / L2R2| < 15

[0160] Condition 3: 0.01 < |L3R1 / L3R2| < 0.1

[0161] Condition 4: 15 < |L4R1 / L4R2| < 20

[0162] Condition 5: 1 < |L5R1 / L5R2| < 1.5

[0163] Condition 6: 0.5 < |L6R1 / L6R2| < 1

[0164] Condition 7: 0.5 < |L7R1 / L7R2| < 1

[0165]

[0166] When describing the center thickness of the lenses based on the optical axis, the center thicknesses (CT1, CT3, CT4) of the first lens (101), the third lens (103), and the fourth lens (104) are the largest among the lenses, and the center thickness (CT7) of the seventh lens (107) is the smallest among the lenses. The difference between the maximum center thickness and the minimum center thickness among the lenses may be in the range of 0.4 mm or more and 0.8 mm or less.

[0167] The center thickness of each lens can satisfy any one of the following conditions.

[0168] Condition 1: CT1, CT3, CT4 > CT2, CT5, CT7, CT6

[0169] Condition 2: CT1, CT3, CT4, CT6 > CT2 > CT5, CT7

[0170] Condition 3: CT1, CT2, CT3, CT4, CT6 > CT5 > CT7

[0171] Condition 4: CT1, CT3, CT4 > CT6 > CT2, CT5, CT7

[0172] Condition 5: CT1, CT2, CT3, CT4, CT5, CT6 > CT7

[0173]

[0174] When zooming, the gap (CG1) between the first lens (101) and the second lens (102), the gap (CG3) between the third lens (103) and the fourth lens (104), the gap (CG5) between the fifth lens (105) and the sixth lens (106), and the gap (CG6) between the sixth lens (106) and the seventh lens (107) do not change, while the gap (CG4) between the fourth lens (104) and the fifth lens (105) may change. Among the center gaps between the lenses that do not change, the gap (CG6) between the sixth lens (106) and the seventh lens (107) may be maximum, and the gap (CG1) between the first lens (101) and the second lens (102) may be minimum. Among the gaps between the lenses, the difference between the maximum center gap and the minimum center gap may be 0.5 mm or more, for example, in the range of 0.5 mm to 1.0 mm.

[0175] The center spacing between each lens can satisfy the following conditions.

[0176] Condition 1: CG3, CG5, CG6 > CG1

[0177] Condition 2: CG5, CG6 > CG3 > CG1

[0178] Condition 3: CG6 > CG5 > CG1, CG3

[0179] Condition 4: CG6 > CG1, CG3, CG5

[0180]

[0181] Regarding the effective aperture, the lens having the maximum effective aperture may be the first lens (101). Here, the effective aperture is the average of the effective aperture on the object side and the effective aperture on the sensor side of each lens. The lens surface having the maximum effective aperture may be the first surface (S1) of the first lens (101). The lens having the minimum effective aperture may be the fourth lens (104). The lens surface having the minimum effective aperture may be the eighth surface (S8) of the fourth lens (104). The effective apertures of the first to seventh lenses (101-107) may be smaller than the diagonal length of the image sensor (500).

[0182] The effective diameter of each lens can satisfy any one of the following conditions.

[0183] Condition 1: CA_L1 > CA_L2, CA_L3, CA_L4, CA_L5, CA_L6, CA_L7

[0184] Condition 2: CA_L1, CA_L5, CA_L6, CA_L7 > CA_L2 > CA_L3, CA_L4

[0185] Condition 3: CA_L1, CA_L2, CA_L5, CA_L6, CA_L7 > CA_L3 > CA_L4

[0186] Condition 4: CA_L1, CA_L2, CA_L3, CA_L5, CA_L6, CA_L7 > CA_L4

[0187] Condition 5: CA_L1 > CA_L5 > CA_L2, CA_L3, CA_L4, CA_L6, CA_L7

[0188] Condition 6: CA_L1, CA_L5, CA_L7 > CA_L6 > CA_L2, CA_L3, CA_L4

[0189] Condition 7: CA_L1, CA_L5 > CA_L7 > CA_L2, CA_L3, CA_L4, CA_L6

[0190]

[0191] Regarding the refractive index, the refractive index of the seventh lens (107) is the maximum among the lenses and may be greater than 1.5, for example, greater than 1.58. Either the third lens (103) or the sixth lens (106) may have the minimum refractive index among the lenses. For example, the refractive index of either the third lens (103) or the sixth lens (106) may be the minimum among the lenses and may be less than 1.6, for example, less than 1.55. The difference between the maximum refractive index and the minimum refractive index may be 0.05 or greater.

[0192] The refractive index of each lens can satisfy any one of the following conditions.

[0193] Condition 1: n2, n4, n7 > n1 > n3, n5, n6

[0194] Condition 2: n7 > n2 > n1, n3, n4, n5, n6

[0195] Condition 3: n1, n2, n4, n5, n7 > n3=n6

[0196] Condition 4: n2, n7 > n4 > n1, n3, n5, n6

[0197] Condition 5: n1, n2, n4, n7 > n5 > n3, n6

[0198] Condition 6: n7 > n1, n2, n3, n4, n5, n6

[0199]

[0200] When comparing the Abbe numbers, the Abbe numbers of the third lens (103) and the sixth lens (106) are the maximum among the lenses and may be 50 or more. The Abbe number of the seventh lens (107) is the minimum among the lenses and may be 30 or less. The difference between the maximum refractive index and the minimum Abbe number may be 30 or more.

[0201] The Abbe number of each lens can satisfy any one of the following conditions.

[0202] Condition 1: v3, v5, v6 > v1 > v2, v4, v7

[0203] Condition 2: v1, v3, v4, v5, v6 > v2 > v7

[0204] Condition 3: v3 = v6 > v1, v2, v4, v5, v7

[0205] Condition 4: v1, v3, v5, v6 > v4 > v2, v7

[0206] Condition 5: v3, v6 > v5 > v1, v2, v4, v7

[0207] Condition 6: v1, v2, v3, v4, v5, v6 > v7

[0208]

[0209] The focal lengths (F1, F3, F6) of the first, third, and sixth lenses (101, 103, 106) may have a positive (+) sign. The first, third, and sixth lenses (101, 103, 106) may have a positive (+) refractive power. The focal lengths (F2, F4, F5, F7) of the second, fourth, fifth, and seventh lenses (102, 104, 105, 107) may have a negative (-) sign. The second, fourth, fifth, and seventh lenses (102, 104, 105, 107) may have a negative (-) refractive power.

[0210] When comparing the absolute values ​​of the focal lengths, the focal length of the fifth lens (105) is the maximum among the lenses and may be 20 or more and 30 or less. The focal length of the sixth lens (106) is the minimum among the lenses, and the absolute value of the focal length of the sixth lens (106) may be 5 or more and 10 or less.

[0211] The absolute value of the focal length of each lens can satisfy any one of the following conditions.

[0212] Condition 1: |f5|, |f7| > |f1| > |f2|, |f3|, |f4|, |f6|

[0213] Condition 2: |f1|, |f5|, |f7| > |f2| > |f3|, |f4|, |f6|

[0214] Condition 3: |f1|, |f2|, |f5|, |f7| > |f3| > |f4|, |f6|

[0215] Condition 4: |f1|, |f2|, |f3|, |f5|, |f7| > |f4| > |f6|

[0216] Condition 5: |f5| > |f1|, |f2|, |f3|, |f4|, |f6|, |f7|

[0217] Condition 6: |f1|, |f2|, |f3|, |f4|, |f5|, |f7| > |f6|

[0218] Condition 7: |f5| > |f7| > |f1|, |f2|, |f3|, |f4|, |f6|

[0219]

[0220] The combined focal length (f_LG1) of the first lens group (LG1) may have a positive (+) sign. The first lens group (LG1) may have a positive (+) combined refractive power. The combined focal length (f_LG2) of the second lens group (LG2) may have a positive (+) sign. The second lens group (LG2) may have a positive (+) combined refractive power. The combined focal length (f_LG3) of the third lens group (LG3) may have a positive (+) sign. The third lens group (LG3) may have a positive (+) combined refractive power.

[0221] When comparing the combined focal lengths of the first to third lens groups (LG1, LG2, LG3) in absolute terms, the combined focal length of the first lens group (LG1) may be the largest, and the combined focal length of the third lens group (LG3) may be the smallest. The relationship between the combined focal lengths of the first to second lens groups (LG1, LG2, LG3) may satisfy |f_LG1| > |f_LG2| > |f_LG3|.

[0222]

[0223] The thickness of the first lens (101) may have a difference between the maximum and minimum thickness of at least 1.5 times, for example, in the range of 1.5 to 2 times, with the center thickness (CT1) being maximum and the edge thickness (ET1) being minimum. The thickness (T2) of the second lens (102) may be minimum at the center and maximum at the edge, with the maximum thickness being in the range of 1 to 1.5 times the minimum thickness. The thickness (T3) of the third lens (103) may be maximum at the center and minimum at the edge, with the maximum thickness being in the range of 2 to 2.5 times the minimum thickness. The thickness (T4) of the fourth lens (104) may be minimum at the center and maximum at the edge, with the maximum thickness being in the range of 1 to 1.5 times the minimum thickness. The thickness (T5) of the fifth lens (105) may be maximum at the center and minimum at the edge, and the maximum thickness is in the range of 1 to 1.5 times the minimum thickness. The thickness (T6) of the sixth lens (106) may be maximum at the center and minimum at the edge, and the maximum thickness is in the range of 2 to 2.5 times the minimum thickness. The thickness (T7) of the seventh lens (107) may be minimum at the center and maximum at the edge, and the maximum thickness is in the range of 1 to 1.5 times the minimum thickness.

[0224]

[0225] The thickness of each lens can satisfy any one of the following conditions.

[0226] Condition 1: 1.5 < CT1 / ET1 < 2, 0.5 < ET1 / CT1 < 1

[0227] Condition 2: 0.5 < CT2 / ET2 < 1, 1 < ET2 / CT2 < 1.5

[0228] Condition 3: 2 < CT3 / ET3 < 2.5, 0.1 < ET3 / CT3 < 0.5

[0229] Condition 4: 0.5 < CT4 / ET4 < 1, 1 < ET4 / CT4 < 1.5

[0230] Condition 5: 1 < CT5 / ET5 < 1.5, 0.5 < ET5 / CT5 < 1

[0231] Condition 6: 2 < CT6 / ET6 < 2.5, 0.1 < ET6 / CT6 < 0.5

[0232] Condition 7: 0.5 < CT7 / ET7 < 1, 1 < ET7 / CT7 < 1.5

[0233] Condition 8: 1 < ΣCT / ΣET < 1.5, 0.5 < ΣET / ΣCT < 1

[0234]

[0235] Among the gaps between lenses (G1, G2, G3, G4, G5, G6) having gaps between adjacent lenses, the gap (LG1) between the first and second lenses (101, 102) may have a minimum center and a maximum edge. The gap (LG3) between the third and fourth lenses (103, 104) may have a minimum center and a maximum edge. The gap (G4) between the fourth and fifth lenses (104, 105) may have a maximum edge and a minimum center. The fifth gap (G5) between the fifth and sixth lenses (105, 106) may have a maximum center and a minimum edge. The sixth gap (G6) between the sixth and seventh lenses (106, 107) may have a maximum center and a minimum edge.

[0236]

[0237] FIG. 4 is a graph showing the aberration characteristics in the first mode of the optical system according to the first embodiment of the present invention, and FIG. 5 is a graph showing the aberration characteristics in the second mode of the optical system according to the first embodiment of the present invention. The aberration graphs in FIG. 4 and FIG. 5 show the longitudinal spherical aberration, astigmatic field curves, and distortion measured from left to right. In FIG. 4 and FIG. 5, the X-axis may represent the focal length (mm) and distortion (%), and the Y-axis may represent the height of the image. Additionally, the graph for longitudinal spherical aberration is for light in the wavelength bands of approximately 435 nm, approximately 470 nm, approximately 510 nm, approximately 555 nm, approximately 610 nm, and 650 nm, and the graphs for astigmatic field curves and distortion are for light in the wavelength band of approximately 555 nm. In the aberration diagrams of FIGS. 4 and 5, it can be interpreted that the closer each curve is to the Y-axis, the better the aberration correction function is. In the optical system (1000) according to the first embodiment, it can be seen that the measured values ​​are adjacent to the Y-axis in almost most areas. That is, the optical system (1000) according to the first embodiment has improved resolution and can have good optical performance not only in the center of the field of view (FOV) but also in the periphery.

[0238]

[0239] FIG. 6 is a graph showing the relative illumination ratio (Relative Illumination Versus Relative Field) of an optical system according to the first embodiment of the present invention operating in a first mode, and FIG. 7 is a graph showing the relative illumination ratio of an optical system according to the first embodiment of the present invention operating in a second mode. FIG. 6 and FIG. 7 are graphs showing the relative illumination ratio or relative illumination (RI) from the center of the image sensor in the optical system to the image height, i.e., from 0 to the maximum height (MaxF = 1F). It can be seen that a relative illumination ratio of 30% or more, for example, exceeding 40%, appears from the center of the image sensor to the diagonal end (1.0F). That is, it can be seen that there is almost no difference in the relative illumination between the first mode and the second mode of the first embodiment of the present invention from the optical axis to the end of the effective area. Accordingly, since the minimum illumination exceeds 40% from the center of the image sensor to the end, more accurate sensing values ​​can be obtained across the entire area of ​​the image sensor.

[0240]

[0241] The optical system according to the second embodiment of the invention will be described.

[0242] FIG. 8 is a configuration diagram of an optical system according to the second embodiment of the present invention operating in a first mode, FIG. 9 is a configuration diagram of an optical system according to the second embodiment of the present invention operating in a second mode, FIG. 10 is a table showing the aspherical coefficients of lenses in an optical system according to the second embodiment of the present invention, FIG. 11 is a graph showing data on the aberration characteristics of an optical system according to the second embodiment of the present invention operating in a first mode, FIG. 12 is a graph showing data on the aberration characteristics of an optical system according to the second embodiment of the present invention operating in a second mode, FIG. 13 is a graph showing the relative illumination ratio (Relative Illumination Versus Relative Field) of an optical system according to the second embodiment of the present invention operating in a first mode, and FIG. 14 is a graph showing the relative illumination ratio of an optical system according to the second embodiment of the present invention operating in a second mode.

[0243] Referring to FIG. 8, the optical system (1100) includes a lens portion, and the lens portion may include first to seventh lenses (201 to 207). The first to seventh lenses (201 to 207) may be arranged sequentially along the optical axis (OA) of the optical system (1100). Light corresponding to information about an object may pass through the first to seventh lenses (201 to 207) and a filter (600) and be incident on an image sensor (500). The optical axis (OA) may refer to the central axis of light incident from the first lens (201) to the image sensor (500).

[0244]

[0245] The first lens (201) may be positioned closest to the object side. The first lens (201) may be positioned furthest from the sensor side. The first lens (201) may have a positive (+) refractive power at the optical axis (OA). The first lens (201) may include plastic or glass material. For example, the first lens (201) may be provided with plastic material.

[0246] With respect to the optical axis (OA), the first surface (S1) on the object side of the first lens (201) may be convex, and the second surface (S2) on the sensor side may be convex. The first lens (201) may have a shape with both sides convex. The first lens (201) may be made of glass material and may have a spherical surface. The first lens (201) may be made of plastic material and may have an aspherical surface. The aspherical coefficients of the first surface (S1) and the second surface (S2) may be provided as L1S1 and L1S2 of FIG. 10. At least one or both of the first surface (S1) and the second surface (S2) of the first lens (201) may be provided without a critical point from the optical axis to the end of the effective area.

[0247]

[0248] The second lens (202) may be positioned second from the object side. The second lens (202) may be positioned seventh from the sensor side. The second lens (202) may be positioned between the first lens (201) and the optical path control member (211). The second lens (202) may have negative (-) refractive power. The second lens (202) may include plastic or glass material. For example, the second lens (202) may be provided with plastic material.

[0249] With respect to the optical axis, the object-side third surface (S3) of the second lens (202) may be concave, and the sensor-side fourth surface (S4) may be concave. The second lens (202) may have a shape with both sides concave. The second lens (202) may be made of plastic material and may have an aspherical surface. The aspherical coefficients of the third surface (S3) and the fourth surface (S4) may be provided as L2S1 and L2S2 of FIG. 10. At least one or both of the third surface (S3) and the fourth surface (S4) of the second lens (202) may be provided without a threshold point from the optical axis to the end of the effective area.

[0250]

[0251] The optical path control member (211) may be positioned on the sensor side of the second lens (202). The optical path control member (211) may include plastic or glass material. For example, the optical path control member (211) may be provided with glass material. The object-side incident surface (P1) and the sensor-side exit surface (P2) of the optical path control member (211) may be formed as flat surfaces.

[0252] The optical path control member (211) may be a prism lens. The optical path control member (211) may be a right-angle prism lens. The optical path control member (211) may change the path of light incident from the outside. The optical path control member (211) may include a mirror and a prism. The optical path control member (211) may rotate the optical path by 90°. The optical path control member (211) includes an incident surface (P1) into which light is incident, a reflective surface (RS1) that reflects the incident light, and an exit surface (P2) that emits the reflected light. The reflective surface (RS1) has an inclination angle of 45° and reflects the main ray of the incident light by 90°, thereby serving to reflect the incident light to the third lens (203). The light path control member (211) can change the path of light to the first direction (X-axis direction) by reflecting light incident in the second direction (Y-axis direction).

[0253]

[0254] The third lens (203) may be positioned as the fourth lens from the object side. The third lens (203) may be positioned as the fifth lens from the sensor side. The third lens (203) may be positioned between the optical path control member (211) and the fourth lens (204). The third lens (203) may have a positive (+) refractive power at the optical axis (OA). The third lens (203) may include plastic or glass material. For example, the third lens (203) may be provided with plastic material.

[0255] With respect to the optical axis, the object-side fifth surface (S5) of the third lens (203) may be convex, and the sensor-side sixth surface (S6) may be concave. The third lens (203) may have a meniscus shape with the object side being convex. The third lens (203) may have a meniscus shape with the sensor side being concave. The third lens (203) may be made of plastic material and may have an aspherical surface. At least one or both of the fifth surface (S5) and the sixth surface (S6) of the third lens (203) may be provided without a critical point from the optical axis to the end of the effective area.

[0256]

[0257] The fourth lens (204) may be positioned as the fifth lens from the object side. The fourth lens (204) may be positioned as the fourth lens from the sensor side. The fourth lens (204) may be positioned between the third lens (203) and the fifth lens (205). The fourth lens (204) may have negative (-) refractive power. The fourth lens (204) may include plastic or glass material. For example, the fourth lens (204) may be provided with plastic material.

[0258] With respect to the optical axis, the object-side 7th surface (S7) of the 4th lens (204) may be convex, and the sensor-side 8th surface (S8) may be concave. The 4th lens (204) may have a meniscus shape with the object side being convex. The 4th lens (204) may have a meniscus shape with the sensor side being concave. The 4th lens (204) may be made of plastic material and may have an aspherical surface. The aspherical coefficients of the 7th surface (S7) and the 8th surface (S8) may be provided as L4S1 and L4S2 of FIG. 10. At least one or both of the 7th surface (S7) and the 8th surface (S8) of the 4th lens (204) may be provided without a critical point from the optical axis to the end of the effective area.

[0259]

[0260] The fifth lens (205) may be positioned as the sixth lens from the object side. The fifth lens (205) may be positioned as the third lens from the sensor side. The fifth lens (205) may be positioned between the fourth lens (204) and the sixth lens (206). The fifth lens (205) may have a positive (+) refractive power. The fifth lens (205) may include plastic or glass materials. For example, the fifth lens (205) may be provided with a plastic material.

[0261] With respect to the optical axis (OA), the fifth lens (205) may have a convex ninth surface (S9) on the object side and a concave tenth surface (S10) on the sensor side. The fifth lens (205) may have a meniscus shape with the object side being convex. The fifth lens (205) may have a meniscus shape with the sensor side being concave. The fifth lens (205) is made of plastic material and may have an aspherical surface. The aspherical coefficients of the ninth surface (S9) and the tenth surface (S10) may be provided as L5S1 and L5S2 of FIG. 10. The ninth surface (S9) of the fifth lens (205) may be provided without a critical point from the optical axis to the end of the effective area.

[0262] The tenth surface (S10) of the fifth lens (205) may have a critical point from the optical axis to the end of the effective area. When the tenth surface (S10) has a critical point, it may be located in the range of 80% to 90% of the effective radius from the optical axis, preferably in the range of 85% to 90%. For example, the critical point of the tenth surface (S10) may be located at approximately 88% of the effective radius from the optical axis. The critical point of the tenth surface (S10) is a point where the sign of the slope value with respect to the optical axis and the direction perpendicular to the optical axis changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean a point where the slope value is 0. Additionally, the critical point of the tenth surface (S10) may be a point where the slope value of the tangent passing through the lens surface increases and then decreases, or decreases and then increases.

[0263]

[0264] The sixth lens (206) may be positioned as the seventh lens from the object side. The sixth lens (206) may be positioned as the second lens from the sensor side. The sixth lens (206) may be positioned between the fifth lens (205) and the seventh lens (207). The sixth lens (206) may have a positive (+) refractive power. The sixth lens (206) may include plastic or glass materials. For example, the sixth lens (206) may be provided with a plastic material.

[0265] With respect to the optical axis (OA), the 6th lens (206) may have a concave 9th surface (S9) on the object side and a convex 10th surface (S10) on the sensor side. The 6th lens (206) may have a meniscus shape with the object side being concave. The 6th lens (206) may have a meniscus shape with the sensor side being convex. The 6th lens (206) is made of plastic material and may have an aspherical surface. The aspherical coefficients of the 11th surface (S11) and the 12th surface (S12) may be provided as L6S1 and L6S2 of FIG. 10.

[0266] The eleventh surface (S11) of the sixth lens (206) may have a critical point from the optical axis to the end of the effective area. When the eleventh surface (S11) has a critical point, it may be located in the range of 50% to 60% of the effective radius from the optical axis, preferably in the range of 55% to 60%. For example, the critical point of the eleventh surface (S11) may be located at approximately 57% of the effective radius from the optical axis. The twelfth surface (S12) of the sixth lens (206) may have a critical point from the optical axis to the end of the effective area. When the twelfth surface (S12) has a critical point, it may be located in the range of 80% to 90% of the effective radius from the optical axis, preferably in the range of 80% to 85%. For example, the critical point of the twelfth surface (S12) may be located at approximately 83% of the effective radius from the optical axis.

[0267] The critical point of the 11th surface (S11) and the 12th surface (S12) is a point where the sign of the slope value with respect to the optical axis and the direction perpendicular to the optical axis changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean a point where the slope value is 0. Additionally, the critical point of the 12th surface (S12) may be a point where the slope value of the tangent line passing through the lens surface increases and then decreases, or decreases and then increases.

[0268]

[0269] The seventh lens (207) may be positioned furthest from the object side. The seventh lens (207) may be positioned closest to the sensor side. The seventh lens (207) may have negative (-) refractive power. The seventh lens (207) may include plastic or glass material. For example, the seventh lens (207) may be provided with plastic material.

[0270] With respect to the optical axis (OA), the 7th lens (207) may have a convex 13th surface (S13) on the object side and a concave 14th surface (S14) on the sensor side. The 7th lens (207) may have a meniscus shape with the object side being convex. The 7th lens (207) may have a meniscus shape with the sensor side being concave. The 7th lens (207) is made of plastic material and may have an aspherical surface. The aspherical coefficients of the 13th surface (S13) and the 14th surface (S14) may be provided as L7S1 and L7S2 of FIG. 10.

[0271] The 13th surface (S13) of the 7th lens (207) may have a critical point from the optical axis to the end of the effective area. If the 13th surface (S13) has a critical point, it may be located in the range of 60% to 70% of the effective radius from the optical axis, preferably in the range of 60% to 65%. For example, the critical point of the 13th surface (S13) may be located at approximately 62% of the effective radius from the optical axis. The 14th surface (S14) of the 7th lens (207) may have a critical point from the optical axis to the end of the effective area. If the 14th surface (S14) has a critical point, it may be located in the range of 65% to 75% of the effective radius from the optical axis, preferably in the range of 68% to 72%. For example, the critical point of the 14th surface (S14) may be located at approximately 70% of the effective radius from the optical axis.

[0272] The critical points of the 13th surface (S13) and the 14th surface (S14) are points where the sign of the slope value with respect to the optical axis and the direction perpendicular to the optical axis changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean points where the slope value is 0. Additionally, the critical point of the 14th surface (S14) may be a point where the slope value of the tangent line passing through the lens surface increases and then decreases, or decreases and then increases.

[0273]

[0274] LensSurfaceRadiusThicknessndvdClearAperture1S19.5971.5001.53655.6996.940 S2-32.7980.521 6.7442S3-30.0741.0491.55540.9186.472 S410.1390.970 6.023prism1P1 6.800 6.800 P2 0.690 9.3323S55.2231.3171.53655.6995.748 S651.1310.050 5.5334S78.7191.2231.57233.8245.309 S83.333Variable (D1) 4.4405S94.6251.5001.53655.6996.540 S106.3900.660 6.7466S11-10.5331.4621.54151.2946.660 S12-5.4110.500 6.2017S133.7730.4001.58230.5966.119 S142.763Variable(D2) 6.274Filter 0.210 7.370 0.300 7.395image 7.465

[0275] Table 4 shows the surface number, radius of curvature, thickness of the center of each lens or distance between lens surfaces, index, nd, Abbe number (Abbe,vd), clear aperture, and focal length of the lens according to the second embodiment of the present invention. At this time, the units of the radius of curvature and the thickness or distance may be mm.

[0276] In Table 4, the thickness of the optical path control member (211) may refer to the thickness along the optical axis (OA). For example, the thickness of the optical path control member (211) may refer to the sum of the thickness from the incident surface (P1) to the reflection surface (RS1) along the y-axis and the thickness from the reflection surface (RS1) to the exit surface (P2) along the x-axis. Additionally, the thickness from the incident surface (P1) to the reflection surface (RS1) along the y-axis of the optical path control member (211) and the thickness from the reflection surface (RS1) to the exit surface (P2) along the x-axis of the optical path control member (211) may be the same. According to a variation, the thickness from the incident surface (P1) to the reflection surface (RS1) along the y-axis of the optical path control member (211) and the thickness from the reflection surface (RS1) to the exit surface (P2) along the x-axis of the optical path control member (211) may be different.

[0277] Although not listed in Table 4, if the optical path control member (211) is a prism lens, it may have a refractive index and an Abbe number depending on the material forming the prism lens. The optical path control member (211) may be a mirror as the optical path control member.

[0278]

[0279] 1st Mode 2nd Mode D14.3742.072D26.2738.575

[0280] Table 5 relates to the spacing (D1, D2) between lenses that varies when operating in either the first mode or the second mode in the optical system according to the second embodiment of the present invention. Here, the first mode refers to the case of photographing an object located at infinity, and the second mode may refer to the case of photographing an object located at a macroscopic distance (e.g., within 200 mm). In the optical system according to the second embodiment, the distance between adjacent lens groups may change during the process of changing from the first mode to the second mode. The third lens group (LG3) may be movable, while the first lens group (LG1) and the second lens group (LG2) may be fixed. The third lens group (LG3) may be a moving group, and the first lens group (LG1) and the second lens group (LG2) may be fixed groups.

[0281] When operating from the first mode to the second mode, the distance (D1) between the second lens group (LG2) and the third lens group (LG3) may decrease, and the distance (D2) between the third lens group (LG3) and the image sensor (500) may increase. When operating from the second mode to the first mode, the distance (D1) between the second lens group (LG2) and the third lens group (LG3) may increase, and the distance (D2) between the third lens group (LG3) and the image sensor (500) may decrease. The stroke length of the third lens group (LG3) may satisfy 2.0 mm to 2.5 mm, and preferably, may satisfy about 2.302 mm. As the third lens group (LG3) moves, the optical performance of the optical system (1100) may change.

[0282]

[0283] EFL(f)19.500FOV20.273LG3_stroke2.302BFL_16.273f114.031BFL_28.575f2-13.527EPD6.940f310.75 1ET10.671f4-10.284ET21.691f524.100ET30.585f618.680ET41.596f7-20.741ET50.965f_LG1148.100ET 61.070f_LG258.163ET70.787f_LG320.629TD_LG13.070CA_Max6.842TD_LG22.590CA_Min4.875TD_LG38. 896CA_Aver6.125L_CT_max1.500ΣCT8.451L_CT_min0.400TTL29.799L_CT_aver1.207Fno2.810ImgH7.465

[0284] Table 6 relates to the items of the mathematical formulas described above in the optical system (1100) of the second embodiment, including the effective focal length (EFL(F)(mm)) of the optical system (1100), the size of the entrance pupil (EPD(mm)), the distance from the sensor side of the last lens to the image sensor in the first mode (BFL_1(mm)), the distance from the sensor side of the last lens to the image sensor in the second mode (BFL_2(mm)), the angle of view (FOV(degree)), the focal lengths (f1~f7)(mm) of the first to seventh lenses (201~207), the edge thicknesses (ET1~ET7), the length of each lens group in the optical axis direction (TD_LG1, TD_LG2, TD_LG3), the focal lengths (f_LG1, f_LG2, f_LG3)(mm) of the first to third lens groups (LG1, LG2, LG3), and from the first lens (201). This relates to the optical axis distance (TD(mm)) to the 7th lens (207), the stroke length (LG3_stroke) of the 3rd lens group (LG3), the total optical axis distance of the optical system (1100) TTL(mm), ImgH(mm), the maximum effective diameter (CA_Max), the minimum effective diameter (CA_Min), the average effective diameter (CA_Aver), the maximum center thickness (L_CT_max), the minimum center thickness (L_CT_min), the average center thickness (L_CT_aver), the F-number (Fno), etc. among the 1st to 7th lenses (201~207).

[0285]

[0286] In the following, the center thickness of the first to seventh lenses (201 to 207) is denoted as CT1 to CT7, the edge thickness of the effective area of ​​each lens is denoted as ET1 to ET7, and the center gap between two adjacent lenses is denoted as CG1 to CG6. BFL (Back focal length) is the optical axis distance from the image sensor (500) to the center of the last lens. TTL is the optical axis distance from the center of the first surface (S1) of the first lens (201) to the top surface of the image sensor (500). In the following, the description of the relationship between the optical path control members (211) is partially omitted.

[0287]

[0288] When comparing the absolute values ​​of the radius of curvature of each lens, the radius of curvature of the 6th surface (S6) of the third lens (203) at the optical axis (OA) may be the maximum among the lenses, and the radius of curvature of the 14th surface (S14) of the seventh lens (207) may be the minimum among the lenses. The absolute value of the radius of curvature of the 1st surface (S1) of the first lens (201) may be smaller than the absolute value of the radius of curvature of the 2nd surface (S2). The absolute value of the radius of curvature of the 3rd surface (S3) of the second lens (202) may be larger than the absolute value of the radius of curvature of the 4th surface (S4). The absolute value of the radius of curvature of the 5th surface (S5) of the third lens (203) may be smaller than the absolute value of the radius of curvature of the 6th surface (S6). The absolute value of the radius of curvature of the 7th surface (S7) of the 4th lens (204) may be greater than the absolute value of the radius of curvature of the 8th surface (S8). The absolute value of the radius of curvature of the 9th surface (S9) of the 5th lens (205) may be smaller than the absolute value of the radius of curvature of the 10th surface (S10). The absolute value of the radius of curvature of the 11th surface (S11) of the 6th lens (206) may be greater than the absolute value of the radius of curvature of the 12th surface (S12). The absolute value of the radius of curvature of the 13th surface (S13) of the 7th lens (207) may be greater than the absolute value of the radius of curvature of the 14th surface (S14).

[0289] The ratio of the radius of curvature of each lens can satisfy the following conditions.

[0290] Condition 1: 0.1 < |L1R1 / L1R2| < 0.5

[0291] Condition 2: 2.5 < |L2R1 / L2R2| < 3

[0292] Condition 3: 0.1 < |L3R1 / L3R2| < 0.5

[0293] Condition 4: 2.5 < |L4R1 / L4R2| < 3

[0294] Condition 5: 0.5 < |L5R1 / L5R2| < 1

[0295] Condition 6: 1.5 < |L6R1 / L6R2| < 2

[0296] Condition 7: 1 < |L7R1 / L7R2| < 1.5

[0297]

[0298] When describing the center thickness of the lenses based on the optical axis, the center thickness (CT1, CT5) of the first lens (201) and the fifth lens (205) is the maximum among the lenses, and the center thickness (CT7) of the seventh lens (207) is the minimum among the lenses. The difference between the maximum center thickness and the minimum center thickness among the lenses may be in the range of 1.0 mm or more and 1.5 mm or less.

[0299] The center thickness of each lens can satisfy any one of the following conditions.

[0300] Condition 1: CT1 = CT5 > CT2, CT3, CT4, CT6, CT7

[0301] Condition 2: CT1, CT3, CT4, CT5, CT6 > CT2 > CT7

[0302] Condition 3: CT1, CT5, CT6 > CT3 > CT2, CT4, CT7

[0303] Condition 4: CT1, CT3, CT5, CT6 > CT4 > CT2, CT7

[0304] Condition 5: CT1, CT5 > CT6 > CT2, CT3, CT4, CT7

[0305] Condition 6: CT1, CT2, CT3, CT4, CT5, CT6 > CT7

[0306]

[0307] When zooming, the gap (CG1) between the first lens (201) and the second lens (202), the gap (CG3) between the third lens (203) and the fourth lens (204), the gap (CG5) between the fifth lens (205) and the sixth lens (206), and the gap (CG6) between the sixth lens (206) and the seventh lens (207) do not change, while the gap (CG4) between the fourth lens (204) and the fifth lens (205) may change. Among the center gaps between the lenses that do not change, the gap (CG5) between the fifth lens (205) and the sixth lens (206) may be maximum, and the gap (CG3) between the third lens (203) and the fourth lens (204) may be minimum. Among the gaps between the lenses, the difference between the maximum center gap and the minimum center gap may be 0.5 mm or more, for example, in the range of 0.5 mm to 1.0 mm.

[0308] The center spacing between each lens can satisfy the following conditions.

[0309] Condition 1: CG5 > CG1 > CG3, CG6

[0310] Condition 2: CG1, CG5, CG6 > CG3

[0311] Condition 3: CG5 > CG1, CG3, CG6

[0312] Condition 4: CG1, CG5 > CG6 > CG3

[0313]

[0314] Regarding the effective aperture, the lens having the maximum effective aperture may be the first lens (201). Here, the effective aperture is the average of the effective aperture on the object side and the effective aperture on the sensor side of each lens. The lens surface having the maximum effective aperture may be the first surface (S1) of the first lens (201). The lens having the minimum effective aperture may be the fourth lens (204). The lens surface having the minimum effective aperture may be the eighth surface (S8) of the fourth lens (204). The effective apertures of the first to seventh lenses (201-207) may be smaller than the diagonal length of the image sensor (500).

[0315] The effective diameter of each lens can satisfy any one of the following conditions.

[0316] Condition 1: CA_L1 > CA_L2, CA_L3, CA_L4, CA_L5, CA_L6, CA_L7

[0317] Condition 2: CA_L1, CA_L5, CA_L6 > CA_L2 > CA_L3, CA_L4, CA_L7

[0318] Condition 3: CA_L1, CA_L2, CA_L5, CA_L6, CA_L7 > CA_L3 > CA_L4

[0319] Condition 4: CA_L1, CA_L2, CA_L3, CA_L5, CA_L6, CA_L7 > CA_L4

[0320] Condition 5: CA_L1 > CA_L5 > CA_L2, CA_L3, CA_L4, CA_L6, CA_L7

[0321] Condition 6: CA_L1, CA_L5 > CA_L6 > CA_L2, CA_L3, CA_L4, CA_L7

[0322] Condition 7: CA_L1, CA_L2, CA_L5, CA_L6 > CA_L7 > CA_L3, CA_L4

[0323]

[0324] Regarding the refractive index, the refractive index of the seventh lens (207) is the maximum among the lenses and may be greater than 1.5, for example, greater than 1.58. Any one of the first lens (201), the third lens (203), and the fifth lens (205) may have the minimum refractive index among the lenses. For example, the refractive index of any one of the first lens (201), the third lens (203), and the fifth lens (205) may be the minimum among the lenses and may be less than 1.6, for example, less than 1.55. The difference between the maximum refractive index and the minimum refractive index may be greater than or equal to 0.03.

[0325] The refractive index of each lens can satisfy any one of the following conditions.

[0326] Condition 1: n2, n4, n6, n7 > n1 = n3 = n5

[0327] Condition 2: n4, n7 > n2 > n1, n3, n5, n6

[0328] Condition 3: n7 > n4 > n1, n2, n3, n5, n6

[0329] Condition 4: n2, n4, n7 > n6 > n1, n3, n5

[0330] Condition 5: n7 > n1, n2, n3, n4, n5, n6

[0331]

[0332] When comparing the Abbe numbers, the Abbe numbers of the first lens (201), the third lens (203), and the fifth lens (205) are the maximum among the lenses and may be 50 or more. The Abbe number of the seventh lens (207) is the minimum among the lenses and may be 40 or less. The difference between the maximum refractive index and the minimum Abbe number may be 20 or more.

[0333] The Abbe number of each lens can satisfy any one of the following conditions.

[0334] Condition 1: v1 = v3 = v5 > v2, v4, v6, v7

[0335] Condition 2: v1, v3, v5, v6 > v2 > v4, v7

[0336] Condition 3: v1, v2, v3, v5, v6 > v4 > v7

[0337] Condition 4: v1, v3, v5 > v6 > v2, v4, v7

[0338] Condition 5: v1, v2, v3, v4, v5, v6 > v7

[0339]

[0340] The focal lengths (F1, F3, F5, F6) of the 1st, 3rd, 5th, and 6th lenses (201, 203, 205, 206) may have a positive (+) sign. The 1st, 3rd, 5th, and 6th lenses (201, 203, 205, 206) may have a positive (+) refractive power. The focal lengths (F2, F4, F7) of the 2nd, 4th, and 7th lenses (202, 204, 207) may have a negative (-) sign. The 2nd, 4th, and 7th lenses (202, 204, 207) may have a negative (-) refractive power.

[0341] When comparing the absolute values ​​of the focal lengths, the focal length of the fifth lens (205) is the maximum among the lenses and may be 20 or more and 30 or less. The focal length of the fourth lens (204) is the minimum among the lenses, and the absolute value of the focal length of the fourth lens (204) may be 10 or more and 15 or less.

[0342] The absolute value of the focal length of each lens can satisfy any one of the following conditions.

[0343] Condition 1: |f5|, |f6|, |f7| > |f1| > |f2|, |f3|, |f4|

[0344] Condition 2: |f1|, |f5|, |f6|, |f7| > |f2| > |f3|, |f4|

[0345] Condition 3: |f1|, |f2|, |f5|, |f6|, |f7| > |f3| > |f4|

[0346] Condition 4: |f1|, |f2|, |f3|, |f5|, |f6|, |f7| > |f4|

[0347] Condition 5: |f5| > |f1|, |f2|, |f3|, |f4|, |f6|, |f7|

[0348] Condition 6: |f5|, |f7| > |f6| > |f1|, |f2|, |f3|, |f4|

[0349] Condition 7: |f5| > |f7| > |f1|, |f2|, |f3|, |f4|, |f6|

[0350]

[0351] The combined focal length (f_LG1) of the first lens group (LG1) may have a positive (+) sign. The first lens group (LG1) may have a positive (+) combined refractive power. The combined focal length (f_LG2) of the second lens group (LG2) may have a positive (+) sign. The second lens group (LG2) may have a positive (+) combined refractive power. The combined focal length (f_LG3) of the third lens group (LG3) may have a positive (+) sign. The third lens group (LG3) may have a positive (+) combined refractive power.

[0352] When comparing the combined focal lengths of the first to third lens groups (LG1, LG2, LG3) in absolute terms, the combined focal length of the first lens group (LG1) may be the largest, and the combined focal length of the third lens group (LG3) may be the smallest. The relationship between the combined focal lengths of the first to second lens groups (LG1, LG2, LG3) may satisfy |f_LG1| > |f_LG2| > |f_LG3|.

[0353]

[0354] The thickness of the first lens (201) may have a difference between the maximum and minimum thickness of at least twice, for example, in the range of 2 to 2.5 times, with the center thickness (CT1) being maximum and the edge thickness (ET1) being minimum. The thickness (T2) of the second lens (202) may be minimum at the center and maximum at the edge, with the maximum thickness being in the range of 1.5 to 2 times the minimum thickness. The thickness (T3) of the third lens (203) may be maximum at the center and minimum at the edge, with the maximum thickness being in the range of 2 to 2.5 times the minimum thickness. The thickness (T4) of the fourth lens (204) may be minimum at the center and maximum at the edge, with the maximum thickness being in the range of 1 to 1.5 times the minimum thickness. The thickness (T5) of the fifth lens (205) may be maximum at the center and minimum at the edge, with the maximum thickness being in the range of 1.5 to 2 times the minimum thickness. The thickness (T6) of the sixth lens (206) may be maximum at the center and minimum at the edge, and the maximum thickness is in the range of 1 to 1.5 times the minimum thickness. The thickness (T7) of the seventh lens (207) may be minimum at the center and maximum at the edge, and the maximum thickness is in the range of 1.5 to 2 times the minimum thickness.

[0355]

[0356] The thickness of each lens can satisfy any one of the following conditions.

[0357] Condition 1: 2 < CT1 / ET1 < 2.5, 0.1 < ET1 / CT1 < 0.5

[0358] Condition 2: 0.5 < CT2 / ET2 < 1, 1.5 < ET2 / CT2 < 2

[0359] Condition 3: 2 < CT3 / ET3 < 2.5, 0.1 < ET3 / CT3 < 0.5

[0360] Condition 4: 0.5 < CT4 / ET4 < 1, 1 < ET4 / CT4 < 1.5

[0361] Condition 5: 1.5 < CT5 / ET5 < 2, 0.5 < ET5 / CT5 < 1

[0362] Condition 6: 1 < CT6 / ET6 < 1.5, 0.5 < ET6 / CT6 < 1

[0363] Condition 7: 0.5 < CT7 / ET7 < 1, 1.5 < ET7 / CT7 < 2

[0364] Condition 8: 1 < ΣCT / ΣET < 1.5, 0.5 < ΣET / ΣCT < 1

[0365]

[0366] Among the gaps between lenses (G1, G2, G3, G4, G5, G6) having gaps between adjacent lenses, the gap (LG1) between the first and second lenses (201, 202) may have a minimum center and a maximum edge. The gap (LG3) between the third and fourth lenses (203, 204) may have a minimum center and a maximum edge. The gap (G4) between the fourth and fifth lenses (204, 205) may have a maximum edge and a minimum center. The fifth gap (G5) between the fifth and sixth lenses (205, 206) may have a maximum center and a minimum edge. The sixth gap (G6) between the sixth and seventh lenses (206, 207) may have a minimum center and a maximum edge.

[0367]

[0368] FIG. 11 is a graph showing the aberration characteristics in the first mode of the optical system according to the second embodiment of the present invention, and FIG. 12 is a graph showing the aberration characteristics in the second mode of the optical system according to the second embodiment of the present invention. The aberration graphs in FIG. 11 and FIG. 12 show the longitudinal spherical aberration, astigmatic field curves, and distortion measured from left to right. In FIG. 11 and FIG. 12, the X-axis may represent the focal length (mm) and distortion (%), and the Y-axis may represent the height of the image. Additionally, the graph for longitudinal spherical aberration is for light in the wavelength bands of approximately 435 nm, approximately 470 nm, approximately 510 nm, approximately 555 nm, approximately 610 nm, and 650 nm, and the graphs for astigmatic field curves and distortion are for light in the wavelength band of approximately 555 nm. In the aberration diagrams of FIGS. 11 and 12, it can be interpreted that the closer each curve is to the Y-axis, the better the aberration correction function is. In the optical system (1100) according to the second embodiment, it can be seen that the measured values ​​are adjacent to the Y-axis in almost all areas. That is, the optical system (1100) according to the second embodiment has improved resolution and can have good optical performance not only in the center of the field of view (FOV) but also in the periphery.

[0369]

[0370] FIG. 13 is a graph showing the relative illumination ratio (Relative Illumination Versus Relative Field) of an optical system according to the second embodiment of the present invention operating in a first mode, and FIG. 14 is a graph showing the relative illumination ratio of an optical system according to the second embodiment of the present invention operating in a second mode. FIG. 13 and FIG. 14 are graphs showing the relative illumination ratio or relative illumination (RI) from the center of the image sensor in the optical system to the image height, i.e., from 0 to the maximum height (MaxF = 1F). It can be seen that a relative illumination ratio of 30% or more, for example, exceeding 40%, appears from the center of the image sensor to the diagonal end (1.0F). That is, it can be seen that there is almost no difference in the relative illumination between the first mode and the second mode of the present embodiment of the present invention from the optical axis to the end of the effective area. Accordingly, since the minimum light intensity from the center to the end of the image sensor exceeds 40%, more accurate sensing values ​​can be obtained across the entire area of ​​the image sensor.

[0371]

[0372] The optical system according to the third embodiment of the invention will be described.

[0373] FIG. 15 is a configuration diagram of an optical system according to the third embodiment of the present invention operating in a first mode, FIG. 16 is a configuration diagram of an optical system according to the third embodiment of the present invention operating in a second mode, FIG. 17 is a table showing the aspherical coefficients of lenses in an optical system according to the third embodiment of the present invention, FIG. 18 is a graph showing data on the aberration characteristics of an optical system according to the third embodiment of the present invention operating in a first mode, FIG. 19 is a graph showing data on the aberration characteristics of an optical system according to the third embodiment of the present invention operating in a second mode, FIG. 20 is a graph showing the relative illumination ratio (Relative Illumination Versus Relative Field) of an optical system according to the third embodiment of the present invention operating in a first mode, and FIG. 21 is a graph showing the relative illumination ratio of an optical system according to the third embodiment of the present invention operating in a second mode.

[0374] Referring to FIG. 15, the optical system (1200) includes a lens portion, and the lens portion may include first to seventh lenses (301 to 307). The first to seventh lenses (301 to 307) may be arranged sequentially along the optical axis (OA) of the optical system (1200). Light corresponding to information about an object may pass through the first to seventh lenses (301 to 307) and a filter (600) and be incident on an image sensor (500). The optical axis (OA) may refer to the central axis of light incident from the first lens (301) to the image sensor (500).

[0375]

[0376] The first lens (301) may be positioned closest to the object side. The first lens (301) may be positioned furthest from the sensor side. The first lens (301) may have a negative (-) refractive power at the optical axis (OA). The first lens (301) may include plastic or glass material. For example, the first lens (301) may be provided with glass material.

[0377] With respect to the optical axis (OA), the first surface (S1) on the object side of the first lens (301) may be convex, and the second surface (S2) on the sensor side may be concave. The first lens (301) may have a meniscus shape with the object side being convex. The first lens (301) may have a meniscus shape with the sensor side being concave. The first lens (301) may be made of glass and may have a spherical surface. The first lens (301) may be made of plastic and may have an aspherical surface. The aspherical coefficients of the first surface (S1) and the second surface (S2) may be provided as L1S1 and L1S2 of FIG. 17. At least one or both of the first surface (S1) and the second surface (S2) of the first lens (301) may be provided without a critical point from the optical axis to the end of the effective area.

[0378]

[0379] The second lens (302) may be positioned second from the object side. The second lens (302) may be positioned seventh from the sensor side. The second lens (302) may be positioned between the first lens (301) and the optical path control member (311). The second lens (302) may have a positive (+) refractive power. The second lens (302) may include plastic or glass material. For example, the second lens (302) may be provided with plastic material.

[0380] With respect to the optical axis, the object-side third surface (S3) of the second lens (302) may be convex, and the sensor-side fourth surface (S4) may be concave. The second lens (302) may have a meniscus shape with the object side being convex. The second lens (302) may have a meniscus shape with the sensor side being concave. The second lens (302) may be made of plastic material and may have an aspherical surface. The aspherical coefficients of the third surface (S3) and the fourth surface (S4) may be provided as L2S1 and L2S2 of FIG. 17. At least one or both of the third surface (S3) and the fourth surface (S4) of the second lens (302) may be provided without a critical point from the optical axis to the end of the effective area.

[0381]

[0382] The optical path control member (311) may be positioned on the sensor side of the second lens (302). The optical path control member (311) may include plastic or glass material. For example, the optical path control member (311) may be provided with glass material. The object-side incident surface (P1) and the sensor-side exit surface (P2) of the optical path control member (311) may be formed as flat surfaces.

[0383] The optical path control member (311) may be a prism lens. The optical path control member (311) may be a right-angle prism lens. The optical path control member (311) may change the path of light incident from the outside. The optical path control member (311) may include a mirror and a prism. The optical path control member (311) may rotate the optical path by 90°. The optical path control member (311) includes an incident surface (P1) into which light is incident, a reflective surface (RS1) that reflects the incident light, and an exit surface (P2) that emits the reflected light. The reflective surface (RS1) has an inclination angle of 45° and reflects the main ray of the incident light by 90°, thereby serving to reflect the incident light to the third lens (303). The light path control member (311) can change the path of light to the first direction (X-axis direction) by reflecting light incident in the second direction (Y-axis direction).

[0384]

[0385] The third lens (303) may be positioned as the fourth lens from the object side. The third lens (303) may be positioned as the fifth lens from the sensor side. The third lens (303) may be positioned between the optical path control member (311) and the fourth lens (304). The third lens (303) may have a positive (+) refractive power on the optical axis (OA). The third lens (303) may include plastic or glass material. For example, the third lens (303) may be provided with glass material.

[0386] With respect to the optical axis, the object-side fifth surface (S5) of the third lens (303) may be convex, and the sensor-side sixth surface (S6) may be concave. The third lens (303) may have a meniscus shape with the object side being convex. The third lens (303) may have a meniscus shape with the sensor side being concave. The third lens (303) may be made of glass and may have a spherical surface. The third lens (303) may be made of plastic and may have an aspherical surface. The aspherical coefficients of the fifth surface (S5) and the sixth surface (S6) may be provided as L3S1 and L3S2 of FIG. 17. At least one or both of the fifth surface (S5) and the sixth surface (S6) of the third lens (303) may be provided without a critical point from the optical axis to the end of the effective area.

[0387]

[0388] The fourth lens (304) may be positioned as the fifth lens from the object side. The fourth lens (304) may be positioned as the fourth lens from the sensor side. The fourth lens (304) may be positioned between the third lens (303) and the fifth lens (305). The fourth lens (304) may have negative (-) refractive power. The fourth lens (304) may include plastic or glass material. For example, the fourth lens (304) may be provided with plastic material.

[0389] With respect to the optical axis, the object-side 7th surface (S7) of the 4th lens (304) may be convex, and the sensor-side 8th surface (S8) may be concave. The 4th lens (304) may have a meniscus shape with the object side being convex. The 4th lens (304) may have a meniscus shape with the sensor side being concave. The 4th lens (304) may be made of plastic material and may have an aspherical surface. The aspherical coefficients of the 7th surface (S7) and the 8th surface (S8) may be provided as L4S1 and L4S2 of FIG. 17. At least one or both of the 7th surface (S7) and the 8th surface (S8) of the 4th lens (304) may be provided without a critical point from the optical axis to the end of the effective area.

[0390]

[0391] The fifth lens (305) may be positioned as the sixth lens from the object side. The fifth lens (305) may be positioned as the third lens from the sensor side. The fifth lens (305) may be positioned between the fourth lens (304) and the sixth lens (306). The fifth lens (305) may have a negative (-) refractive power. The fifth lens (305) may include plastic or glass materials. For example, the fifth lens (305) may be provided with a plastic material.

[0392] With respect to the optical axis (OA), the fifth lens (305) may have a convex ninth surface (S9) on the object side and a concave tenth surface (S10) on the sensor side. The fifth lens (305) may have a meniscus shape with the object side being convex. The fifth lens (305) may have a meniscus shape with the sensor side being concave. The fifth lens (305) is made of plastic material and may have an aspherical surface. The aspherical coefficients of the ninth surface (S9) and the tenth surface (S10) may be provided as L5S1 and L5S2 of FIG. 17. The ninth surface (S9) of the fifth lens (305) may be provided without a critical point from the optical axis to the end of the effective area.

[0393] The tenth surface (S10) of the fifth lens (305) may have a critical point from the optical axis to the end of the effective area. When the tenth surface (S10) has a critical point, it may be located in the range of 80% to 90% of the effective radius from the optical axis, preferably in the range of 80% to 85%. For example, the critical point of the tenth surface (S10) may be located at approximately 83% of the effective radius from the optical axis. The critical point of the tenth surface (S10) is a point where the sign of the slope value with respect to the optical axis and the direction perpendicular to the optical axis changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean a point where the slope value is 0. Additionally, the critical point of the tenth surface (S10) may be a point where the slope value of the tangent line passing through the lens surface increases and then decreases, or decreases and then increases.

[0394]

[0395] The sixth lens (306) may be positioned as the seventh lens from the object side. The sixth lens (306) may be positioned as the second lens from the sensor side. The sixth lens (306) may be positioned between the fifth lens (305) and the seventh lens (307). The sixth lens (306) may have a positive (+) refractive power. The sixth lens (306) may include plastic or glass materials. For example, the sixth lens (306) may be provided with a plastic material.

[0396] With respect to the optical axis (OA), the 6th lens (306) may have a convex 9th surface (S9) on the object side and a convex 10th surface (S10) on the sensor side. The 6th lens (306) may have a shape with both sides convex. The 6th lens (306) is made of plastic material and may have an aspherical surface. The aspherical coefficients of the 11th surface (S11) and the 12th surface (S12) may be provided as L6S1 and L6S2 of FIG. 17.

[0397] The eleventh surface (S11) of the sixth lens (306) may have a critical point from the optical axis to the end of the effective area. When the eleventh surface (S11) has a critical point, it may be located in the range of 80% to 90% of the effective radius from the optical axis, preferably in the range of 85% to 90%. For example, the critical point of the eleventh surface (S11) may be located at approximately 89% of the effective radius from the optical axis. The twelfth surface (S12) of the sixth lens (306) may have a critical point from the optical axis to the end of the effective area. When the twelfth surface (S12) has a critical point, it may be located in the range of 75% to 85% of the effective radius from the optical axis, preferably in the range of 78% to 82%. For example, the critical point of the twelfth surface (S12) may be located at approximately 80% of the effective radius from the optical axis.

[0398] The critical point of the 11th surface (S11) and the 12th surface (S12) is a point where the sign of the slope value with respect to the optical axis and the direction perpendicular to the optical axis changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean a point where the slope value is 0. Additionally, the critical point of the 12th surface (S12) may be a point where the slope value of the tangent line passing through the lens surface increases and then decreases, or decreases and then increases.

[0399]

[0400] The seventh lens (307) may be positioned furthest from the object side. The seventh lens (307) may be positioned closest to the sensor side. The seventh lens (307) may have negative (-) refractive power. The seventh lens (307) may include plastic or glass material. For example, the seventh lens (307) may be provided with plastic material.

[0401] With respect to the optical axis (OA), the 7th lens (307) may have a concave 13th surface (S13) on the object side and a concave 14th surface (S14) on the sensor side. The 7th lens (307) may have a shape with both sides concave. The 7th lens (307) may be made of plastic material and may have an aspherical surface. The aspherical coefficients of the 13th surface (S13) and the 14th surface (S14) may be provided as L7S1 and L7S2 of FIG. 17. The 13th surface (S13) of the 7th lens (307) may be provided without a critical point from the optical axis to the end of the effective area.

[0402] The 14th surface (S14) of the 7th lens (307) may have a critical point from the optical axis to the end of the effective area. When the 14th surface (S14) has a critical point, it may be located in the range of 70% to 80% of the effective radius from the optical axis, preferably in the range of 75% to 80%. For example, the critical point of the 14th surface (S14) may be located at approximately 77% of the effective radius from the optical axis. The critical point of the 14th surface (S14) is a point where the sign of the slope value with respect to the optical axis and the direction perpendicular to the optical axis changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean a point where the slope value is 0. Additionally, the critical point of the 14th surface (S14) may be a point where the slope value of the tangent passing through the lens surface increases and then decreases, or decreases and then increases.

[0403]

[0404] LensSurfaceRadiusThicknessndvdClearAperture1S17.4221.5001.67819.2306.940 S25.7810.300 6.2282S36.5001.3551.53655.6996.251 S47.8271.045 6.022prism1P1 6.600 6.600 P2 0.690 9.3323S55.3241.5001.53655.6996.141 S6103.3060.056 6.0024S710.1011.5001.58131.1225.689 S83.660 Variable (D1) 4.6005S93.9141.1601.54249.6816.706 S102.9630.500 6.6926S116.8161.5001.54847.2296.508 S12-10.2850.648 6.4697S13-16.2751.3081.56038.5796.253 S1419.501Variable (D2) 6.264Filter 0.210 7.375 0.300 7.402image 7.466

[0405] Table 7 shows the surface number, radius of curvature, thickness of the center of each lens or distance between lens surfaces, index, nd, Abbe number (Abbe,vd), clear aperture, and focal length of the lens according to the third embodiment of the present invention. At this time, the units of the radius of curvature and the thickness or distance may be mm.

[0406] In Table 7, the thickness of the optical path control member (311) may refer to the thickness along the optical axis (OA). For example, the thickness of the optical path control member (311) may refer to the sum of the thickness from the incident surface (P1) to the reflection surface (RS1) along the y-axis and the thickness from the reflection surface (RS1) to the exit surface (P2) along the x-axis. Additionally, the thickness from the incident surface (P1) to the reflection surface (RS1) along the y-axis of the optical path control member (311) and the thickness from the reflection surface (RS1) to the exit surface (P2) along the x-axis of the optical path control member (311) may be the same. According to a variation, the thickness from the incident surface (P1) to the reflection surface (RS1) along the y-axis of the optical path control member (311) and the thickness from the reflection surface (RS1) to the exit surface (P2) along the x-axis of the optical path control member (311) may be different.

[0407] Although not listed in Table 7, if the optical path control member (311) is a prism lens, it may have a refractive index and an Abbe number depending on the material forming the prism lens. The optical path control member (311) may be a mirror as the optical path control member.

[0408]

[0409] 1st mode 2nd mode D14.5663.607D25.7606.720

[0410] Table 8 shows the distance between lenses (D1, D2) that varies when operating in either the first mode or the second mode in the optical system according to the third embodiment of the present invention. Here, the first mode refers to the case of photographing an object located at infinity, and the second mode may refer to the case of photographing an object located at a macroscopic distance (e.g., within 200 mm).

[0411] In the optical system according to the third embodiment, the distance between adjacent lens groups may change during the process of changing from the first mode to the second mode. The third lens group (LG3) may move, while the first lens group (LG1) and the second lens group (LG2) may be fixed. The third lens group (LG3) may be a moving group, and the first lens group (LG1) and the second lens group (LG2) may be fixed groups.

[0412] When operating from the first mode to the second mode, the distance (D1) between the second lens group (LG2) and the third lens group (LG3) may decrease, and the distance (D2) between the third lens group (LG3) and the image sensor (500) may increase. When operating from the second mode to the first mode, the distance (D1) between the second lens group (LG2) and the third lens group (LG3) may increase, and the distance (D2) between the third lens group (LG3) and the image sensor (500) may decrease. The stroke length of the third lens group (LG3) may satisfy 0.5 mm to 1.5 mm, and preferably, may satisfy about 0.960 mm. As the third lens group (LG3) moves, the optical performance of the optical system (1200) may change.

[0413]

[0414] EFL(f)19.500FOV20.296LG3_stroke0.960BFL_15.760f1-61.198BFL_26.720f252.767EPD6.940f310.421ET11.569f4-10.813ET21.121f5-39.355ET30.671f67.723ET41.872f7-15.634ET50.562f_LG15871.601ET61.053f_LG236.359ET71.901f_LG322.469TD_LG13.155CA_Max6.699TD_LG23.056CA_Min5.145TD_LG39.684CA_Aver6.198L_CT_max1.500ΣCT9.823L_CT_min1.160TTL30.500L_CT_aver1.403Fno2.810 ImgH7.466

[0415] Table 9 relates to the items of the mathematical formulas described above in the optical system (1200) of the third embodiment, including the effective focal length (EFL(F)(mm)) of the optical system (1200), the size of the entrance pupil (EPD(mm)), the distance from the sensor side of the last lens to the image sensor in the first mode (BFL_1(mm)), the distance from the sensor side of the last lens to the image sensor in the second mode (BFL_2(mm)), the angle of view (FOV(degree)), the focal lengths (f1~f7)(mm) of the first to seventh lenses (301~307), the edge thicknesses (ET1~ET7), the length of each lens group in the optical axis direction (TD_LG1, TD_LG2, TD_LG3), the focal lengths (f_LG1, f_LG2, f_LG3)(mm) of the first to third lens groups (LG1, LG2, LG3), and from the first lens (301). This relates to the optical axis distance (TD(mm)) to the 7th lens (307), the stroke length (LG3_stroke) of the 3rd lens group (LG3), the total optical axis distance of the optical system (1200) TTL(mm), ImgH(mm), the maximum effective diameter (CA_Max), the minimum effective diameter (CA_Min), the average effective diameter (CA_Aver), the maximum center thickness (L_CT_max), the minimum center thickness (L_CT_min), the average center thickness (L_CT_aver), the F-number (Fno), etc. among the 1st to 7th lenses (301~307).

[0416]

[0417] In the following, the center thickness of the first to seventh lenses (301 to 307) is denoted as CT1 to CT7, the edge thickness of the effective area of ​​each lens is denoted as ET1 to ET7, and the center gap between two adjacent lenses is denoted as CG1 to CG6. BFL (Back focal length) is the optical axis distance from the image sensor (500) to the center of the last lens. TTL is the optical axis distance from the center of the first surface (S1) of the first lens (301) to the top surface of the image sensor (500). In the following, the description of the relationship between the optical path control members (311) is partially omitted.

[0418]

[0419] When comparing the absolute values ​​of the radius of curvature of each lens, the radius of curvature of the 6th surface (S6) of the third lens (303) at the optical axis (OA) may be the maximum among the lenses, and the radius of curvature of the 10th surface (S10) of the fifth lens (305) may be the minimum among the lenses. The absolute value of the radius of curvature of the 1st surface (S1) of the first lens (301) may be greater than the absolute value of the radius of curvature of the 2nd surface (S2). The absolute value of the radius of curvature of the 3rd surface (S3) of the second lens (302) may be smaller than the absolute value of the radius of curvature of the 4th surface (S4). The absolute value of the radius of curvature of the 5th surface (S5) of the third lens (303) may be smaller than the absolute value of the radius of curvature of the 6th surface (S6). The absolute value of the radius of curvature of the 7th surface (S7) of the 4th lens (304) may be greater than the absolute value of the radius of curvature of the 8th surface (S8). The absolute value of the radius of curvature of the 9th surface (S9) of the 5th lens (305) may be greater than the absolute value of the radius of curvature of the 10th surface (S10). The absolute value of the radius of curvature of the 11th surface (S11) of the 6th lens (306) may be smaller than the absolute value of the radius of curvature of the 12th surface (S12). The absolute value of the radius of curvature of the 13th surface (S13) of the 7th lens (307) may be smaller than the absolute value of the radius of curvature of the 14th surface (S14).

[0420] The ratio of the radius of curvature of each lens can satisfy the following conditions.

[0421] Condition 1: 1 < |L1R1 / L1R2| < 1.5

[0422] Condition 2: 0.5 < |L2R1 / L2R2| < 1

[0423] Condition 3: 0.05 < |L3R1 / L3R2| < 0.1

[0424] Condition 4: 2.5 < |L4R1 / L4R2| < 3

[0425] Condition 5: 1 < |L5R1 / L5R2| < 1.5

[0426] Condition 6: 0.5 < |L6R1 / L6R2| < 1

[0427] Condition 7: 0.5 < |L7R1 / L7R2| < 1

[0428]

[0429] When describing the center thickness of the lenses based on the optical axis, the center thicknesses (CT1, CT3, CT4, CT6) of the first lens (301), the third lens (303), the fourth lens (304), and the sixth lens (306) are the largest among the lenses, and the center thickness (CT5) of the fifth lens (305) is the smallest among the lenses. The difference between the maximum center thickness and the minimum center thickness among the lenses may be in the range of 0.1 mm or more and 0.5 mm or less.

[0430] The center thickness of each lens can satisfy any one of the following conditions.

[0431] Condition 1: CT1 = CT3 = CT4 = CT6 > CT2, CT5, CT7

[0432] Condition 2: CT1, CT3, CT4, CT6 > CT2 > CT5, CT7

[0433] Condition 3: CT1, CT2, CT3, CT4, CT6, CT7 > CT5

[0434] Condition 4: CT1, CT2, CT3, CT4, CT6 > CT7 > CT5

[0435]

[0436] When zooming, the gap (CG1) between the first lens (301) and the second lens (302), the gap (CG3) between the third lens (303) and the fourth lens (304), the gap (CG5) between the fifth lens (305) and the sixth lens (306), and the gap (CG6) between the sixth lens (306) and the seventh lens (307) do not change, while the gap (CG4) between the fourth lens (304) and the fifth lens (305) may change. Among the center gaps between the lenses that do not change, the gap (CG6) between the sixth lens (306) and the seventh lens (307) may be maximum, and the gap (CG3) between the third lens (303) and the fourth lens (304) may be minimum. Among the gaps between the lenses, the difference between the maximum center gap and the minimum center gap may be 0.5 mm or more, for example, in the range of 0.5 mm to 1.0 mm.

[0437] The center spacing between each lens can satisfy the following conditions.

[0438] Condition 1: CG5, CG6 > CG1 > CG3

[0439] Condition 2: CG1, CG5, CG6 > CG3

[0440] Condition 3: CG6 > CG5 > CG1, CG3

[0441] Condition 4: CG6 > CG1, CG3, CG5

[0442]

[0443] Regarding the effective aperture, the lens having the maximum effective aperture may be the fifth lens (305). Here, the effective aperture is the average of the effective aperture on the object side and the effective aperture on the sensor side of each lens. The lens surface having the maximum effective aperture may be the first surface (S1) of the first lens (301). The lens having the minimum effective aperture may be the fourth lens (304). The lens surface having the minimum effective aperture may be the eighth surface (S8) of the fourth lens (304). The effective apertures of the first to seventh lenses (301-307) may be smaller than the diagonal length of the image sensor (500).

[0444] The effective diameter of each lens can satisfy any one of the following conditions.

[0445] Condition 1: CA_L5 > CA_L1 > CA_L2, CA_L3, CA_L4, CA_L6, CA_L7

[0446] Condition 2: CA_L1, CA_L5, CA_L6, CA_L7 > CA_L2 > CA_L3, CA_L4

[0447] Condition 3: CA_L1, CA_L2, CA_L5, CA_L6, CA_L7 > CA_L3 > CA_L4

[0448] Condition 4: CA_L1, CA_L2, CA_L3, CA_L5, CA_L6, CA_L7 > CA_L4

[0449] Condition 5: CA_L5 > CA_L1, CA_L2, CA_L3, CA_L4, CA_L6, CA_L7

[0450] Condition 6: CA_L1, CA_L5 > CA_L6 > CA_L2, CA_L3, CA_L4, CA_L7

[0451] Condition 7: CA_L1, CA_L5, CA_L6 > CA_L7 > CA_L2, CA_L3, CA_L4

[0452]

[0453] Regarding the refractive index, the refractive index of the first lens (301) is the maximum among the lenses and may be greater than 1.6, for example, greater than 1.65. Either of the second lens (302) and the third lens (303) may have the minimum refractive index among the lenses. For example, the refractive index of either the second lens (302) or the third lens (303) may be the minimum among the lenses and may be less than 1.6, for example, less than 1.55. The difference between the maximum refractive index and the minimum refractive index may be 0.1 or greater.

[0454] The refractive index of each lens can satisfy any one of the following conditions.

[0455] Condition 1: n1 > n2, n3, n4, n5, n6, n7

[0456] Condition 2: n1, n4, n5, n6, n7 > n2 = n3

[0457] Condition 3: n1 > n4 > n2, n3, n5, n6, n7

[0458] Condition 4: n1, n4, n6, n7 > n5 > n2, n3

[0459] Condition 5: n1, n4, n7 > n6 > n2, n3, n5

[0460] Condition 6: n1, n4 > n7 > n2, n3, n5, n6

[0461]

[0462] When comparing the Abbe numbers, the Abbe numbers of the second lens (302) and the third lens (303) are the maximum among the lenses and may be 50 or more. The Abbe number of the first lens (301) is the minimum among the lenses and may be 20 or less. The difference between the maximum refractive index and the minimum Abbe number may be 30 or more.

[0463] The Abbe number of each lens can satisfy any one of the following conditions.

[0464] Condition 1: v2, v3, v4, v5, v6, v7 > v1

[0465] Condition 2: v2 = v3 > v1, v4, v5, v6, v7

[0466] Condition 3: v2, v3, v5, v6, v7 > v4 > v1

[0467] Condition 4: v2, v3 > v5 > v1, v4, v6, v7

[0468] Condition 5: v2, v3, v5 > v6 > v1, v4, v7

[0469] Condition 6: v2, v3, v5, v6 > v7 > v1, v4

[0470]

[0471] The focal lengths (F2, F3, F6) of the 2nd, 3rd, and 6th lenses (302, 303, 306) may have a positive (+) sign. The 2nd, 3rd, and 6th lenses (302, 303, 306) may have a positive (+) refractive power. The focal lengths (F1, F4, F5, F7) of the 1st, 4th, 5th, and 7th lenses (301, 304, 305, 307) may have a negative (-) sign. The 1st, 4th, 5th, and 7th lenses (301, 304, 305, 307) may have a negative (-) refractive power.

[0472] When comparing the absolute values ​​of the focal lengths, the focal length of the first lens (301) is the maximum among the lenses and may be 50 or more and 80 or less. The focal length of the sixth lens (306) is the minimum among the lenses, and the absolute value of the focal length of the sixth lens (306) may be 5 or more and 10 or less.

[0473] The absolute value of the focal length of each lens can satisfy any one of the following conditions.

[0474] Condition 1: |f1| > |f2|, |f3|, |f4|, |f5|, |f6|, |f7|

[0475] Condition 2: |f1| > |f2| > |f3|, |f4|, |f5|, |f6|, |f7|

[0476] Condition 3: |f1|, |f2|, |f4|, |f5|, |f7| > |f3| > |f6|

[0477] Condition 4: |f1|, |f2|, |f5|, |f7| > |f4| > |f3|, |f6|

[0478] Condition 5: |f1|, |f2| > |f5| > |f3|, |f4|, |f6|, |f7|

[0479] Condition 6: |f1|, |f2|, |f3|, |f4|, |f5|, |f7| > |f6|

[0480] Condition 7: |f1|, |f2|, |f5| > |f7| > |f3|, |f4|, |f6|

[0481]

[0482] The combined focal length (f_LG1) of the first lens group (LG1) may have a positive (+) sign. The first lens group (LG1) may have a positive (+) combined refractive power. The combined focal length (f_LG2) of the second lens group (LG2) may have a positive (+) sign. The second lens group (LG2) may have a positive (+) combined refractive power. The combined focal length (f_LG3) of the third lens group (LG3) may have a positive (+) sign. The third lens group (LG3) may have a positive (+) combined refractive power.

[0483] When comparing the combined focal lengths of the first to third lens groups (LG1, LG2, LG3) in absolute terms, the combined focal length of the first lens group (LG1) may be the largest, and the combined focal length of the third lens group (LG3) may be the smallest. The relationship between the combined focal lengths of the first to second lens groups (LG1, LG2, LG3) may satisfy |f_LG1| > |f_LG2| > |f_LG3|.

[0484]

[0485] The thickness of the first lens (301) may have a difference between the maximum and minimum thickness of at least 1 time, for example, in the range of 1 to 1.5 times, with the center thickness (CT1) being minimum and the edge thickness (ET1) being maximum. The thickness (T2) of the second lens (302) may be maximum at the center and minimum at the edge, with the maximum thickness being in the range of 1 to 1.5 times the minimum thickness. The thickness (T3) of the third lens (303) may be maximum at the center and minimum at the edge, with the maximum thickness being in the range of 2 to 2.5 times the minimum thickness. The thickness (T4) of the fourth lens (304) may be minimum at the center and maximum at the edge, with the maximum thickness being in the range of 1 to 1.5 times the minimum thickness. The thickness (T5) of the fifth lens (305) may be maximum at the center and minimum at the edge, with the maximum thickness being in the range of 2 to 2.5 times the minimum thickness. The thickness (T6) of the sixth lens (306) may be maximum at the center and minimum at the edge, and the maximum thickness is in the range of 1 to 1.5 times the minimum thickness. The thickness (T7) of the seventh lens (307) may be minimum at the center and maximum at the edge, and the maximum thickness is in the range of 1 to 1.5 times the minimum thickness.

[0486]

[0487] The thickness of each lens can satisfy any one of the following conditions.

[0488] Condition 1: 0.5 < CT1 / ET1 < 1, 1 < ET1 / CT1 < 1.5

[0489] Condition 2: 1 < CT2 / ET2 < 1.5, 0.5 < ET2 / CT2 < 1

[0490] Condition 3: 2 < CT3 / ET3 < 2.5, 0.1 < ET3 / CT3 < 0.5

[0491] Condition 4: 0.5 < CT4 / ET4 < 1, 1 < ET4 / CT4 < 1.5

[0492] Condition 5: 2 < CT5 / ET5 < 2.5, 0.1 < ET5 / CT5 < 0.5

[0493] Condition 6: 1 < CT6 / ET6 < 1.5, 0.5 < ET6 / CT6 < 1

[0494] Condition 7: 0.5 < CT7 / ET7 < 1, 1 < ET7 / CT7 < 1.5

[0495] Condition 8: 1 < ΣCT / ΣET < 1.5, 0.5 < ΣET / ΣCT < 1

[0496]

[0497] Among the gaps between lenses (G1, G2, G3, G4, G5, G6) having gaps between adjacent lenses, the gap (LG1) between the first and second lenses (301, 302) may have a maximum center and a minimum edge. The gap (LG3) between the third and fourth lenses (303, 304) may have a minimum center and a maximum edge. The gap (G4) between the fourth and fifth lenses (304, 305) may have a maximum edge and a minimum center. The fifth gap (G5) between the fifth and sixth lenses (305, 306) may have a maximum center and a minimum edge. The sixth gap (G6) between the sixth and seventh lenses (306, 307) may have a maximum center and a minimum edge.

[0498]

[0499] FIG. 18 is a graph showing the aberration characteristics in the first mode of the optical system according to the third embodiment of the present invention, and FIG. 19 is a graph showing the aberration characteristics in the second mode of the optical system according to the third embodiment of the present invention. The aberration graphs in FIG. 18 and FIG. 19 show the longitudinal spherical aberration, astigmatic field curves, and distortion measured from left to right. In FIG. 18 and FIG. 19, the X-axis may represent the focal length (mm) and distortion (%), and the Y-axis may represent the height of the image. Additionally, the graph for longitudinal spherical aberration is for light in the wavelength bands of approximately 435 nm, approximately 470 nm, approximately 510 nm, approximately 555 nm, approximately 610 nm, and 650 nm, and the graphs for astigmatic field curves and distortion are for light in the wavelength band of approximately 555 nm. In the aberration diagrams of FIGS. 18 and 19, it can be interpreted that the closer each curve is to the Y-axis, the better the aberration correction function is. In the optical system (1200) according to the third embodiment, it can be seen that the measured values ​​are adjacent to the Y-axis in almost most areas. That is, the optical system (1200) according to the third embodiment has improved resolution and can have good optical performance not only in the center of the field of view (FOV) but also in the periphery.

[0500]

[0501] FIG. 20 is a graph showing the relative illumination ratio (Relative Illumination Versus Relative Field) of an optical system according to the third embodiment of the present invention operating in a first mode, and FIG. 21 is a graph showing the relative illumination ratio of an optical system according to the third embodiment of the present invention operating in a second mode. FIG. 20 and FIG. 21 are graphs showing the relative illumination ratio or relative illumination (RI) from the center of the image sensor in the optical system to the image height, i.e., from 0 to the maximum height (MaxF = 1F). It can be seen that a relative illumination ratio of 40% or more, for example, exceeding 50%, appears from the center of the image sensor to the diagonal end (1.0F). That is, it can be seen that there is almost no difference in the relative illumination between the first mode and the second mode of the third embodiment of the present invention from the optical axis to the end of the effective area. Accordingly, since the minimum light intensity from the center to the end of the image sensor exceeds 40%, more accurate sensing values ​​can be obtained across the entire area of ​​the image sensor.

[0502]

[0503] The optical system according to the fourth embodiment of the invention will be described.

[0504] FIG. 22 is a configuration diagram of an optical system according to the fourth embodiment of the present invention operating in a first mode, FIG. 23 is a configuration diagram of an optical system according to the fourth embodiment of the present invention operating in a second mode, FIG. 24 is a table showing the aspherical coefficients of lenses in an optical system according to the fourth embodiment of the present invention, FIG. 25 is a graph showing data on the aberration characteristics of an optical system according to the fourth embodiment of the present invention operating in a first mode, FIG. 26 is a graph showing data on the aberration characteristics of an optical system according to the fourth embodiment of the present invention operating in a second mode, FIG. 27 is a graph showing the relative illumination ratio (Relative Illumination Versus Relative Field) of an optical system according to the fourth embodiment of the present invention operating in a first mode, and FIG. 28 is a graph showing the relative illumination ratio of an optical system according to the fourth embodiment of the present invention operating in a second mode.

[0505] Referring to FIG. 22, the optical system (1300) includes a lens section, and the lens section may include first to seventh lenses (401 to 407). The first to seventh lenses (401 to 407) may be arranged sequentially along the optical axis (OA) of the optical system (1300). Light corresponding to information about an object may pass through the first to seventh lenses (401 to 407) and a filter (600) and be incident on an image sensor (500). The optical axis (OA) may refer to the central axis of light incident from the first lens (401) to the image sensor (500).

[0506]

[0507] The first lens (401) may be positioned closest to the object side. The first lens (401) may be positioned furthest from the sensor side. The first lens (401) may have a positive (+) refractive power at the optical axis (OA). The first lens (401) may include plastic or glass material. For example, the first lens (401) may be provided with glass material.

[0508] With respect to the optical axis (OA), the first surface (S1) on the object side of the first lens (401) may be convex, and the second surface (S2) on the sensor side may be concave. The first lens (401) may have a meniscus shape with the object side being convex. The first lens (401) may have a meniscus shape with the sensor side being concave. The first lens (401) may be made of glass and may have a spherical surface. The first lens (401) may be made of plastic and may have an aspherical surface. The aspherical coefficients of the first surface (S1) and the second surface (S2) may be provided as L1S1 and L1S2 of FIG. 24. At least one or both of the first surface (S1) and the second surface (S2) of the first lens (401) may be provided without a critical point from the optical axis to the end of the effective area.

[0509]

[0510] The second lens (402) may be positioned second from the object side. The second lens (402) may be positioned seventh from the sensor side. The second lens (402) may be positioned between the first lens (401) and the optical path control member (411). The second lens (402) may have negative (-) refractive power. The second lens (402) may include plastic or glass material. For example, the second lens (402) may be provided with plastic material.

[0511] With respect to the optical axis, the object-side third surface (S3) of the second lens (402) may be concave, and the sensor-side fourth surface (S4) may be concave. The second lens (402) may have a shape with both sides concave. The second lens (402) may be made of plastic material and may have an aspherical surface. The aspherical coefficients of the third surface (S3) and the fourth surface (S4) may be provided as L2S1 and L2S2 of FIG. 24. At least one or both of the third surface (S3) and the fourth surface (S4) of the second lens (402) may be provided without a threshold point from the optical axis to the end of the effective area.

[0512]

[0513] The optical path control member (411) may be positioned on the sensor side of the second lens (402). The optical path control member (411) may include plastic or glass material. For example, the optical path control member (411) may be provided with glass material. The object-side incident surface (P1) and the sensor-side exit surface (P2) of the optical path control member (411) may be formed as flat surfaces.

[0514] The optical path control member (411) may be a prism lens. The optical path control member (411) may be a right-angle prism lens. The optical path control member (411) may change the path of light incident from the outside. The optical path control member (411) may include a mirror and a prism. The optical path control member (411) may rotate the optical path by 90°. The optical path control member (411) includes an incident surface (P1) into which light is incident, a reflective surface (RS1) that reflects the incident light, and an exit surface (P2) that emits the reflected light. The reflective surface (RS1) has an inclination angle of 45° and reflects the main ray of the incident light by 90°, thereby serving to reflect the incident light to the third lens (403). The light path control member (411) can change the path of light to the first direction (X-axis direction) by reflecting light incident in the second direction (Y-axis direction).

[0515]

[0516] The third lens (403) may be positioned as the fourth lens from the object side. The third lens (403) may be positioned as the fifth lens from the sensor side. The third lens (403) may be positioned between the optical path control member (411) and the fourth lens (404). The third lens (403) may have a positive (+) refractive power at the optical axis (OA). The third lens (403) may include plastic or glass material. For example, the third lens (403) may be provided with glass material.

[0517] With respect to the optical axis, the object-side fifth surface (S5) of the third lens (403) may be convex, and the sensor-side sixth surface (S6) may be convex. The third lens (403) may have a shape with both sides convex. The third lens (403) may be made of glass and may have a spherical surface. The third lens (403) may be made of plastic and may have an aspherical surface. The aspherical coefficients of the fifth surface (S5) and the sixth surface (S6) may be provided as L3S1 and L3S2 of FIG. 24. At least one or both of the fifth surface (S5) and the sixth surface (S6) of the third lens (403) may be provided without a threshold point from the optical axis to the end of the effective area.

[0518]

[0519] The fourth lens (404) may be positioned as the fifth lens from the object side. The fourth lens (404) may be positioned as the fourth lens from the sensor side. The fourth lens (404) may be positioned between the third lens (403) and the fifth lens (405). The fourth lens (404) may have negative (-) refractive power. The fourth lens (404) may include plastic or glass material. For example, the fourth lens (404) may be provided with plastic material.

[0520] With respect to the optical axis, the object-side 7th surface (S7) of the 4th lens (404) may be concave, and the sensor-side 8th surface (S8) may be convex. The 4th lens (404) may have a meniscus shape with the object side being concave. The 4th lens (404) may have a meniscus shape with the sensor side being convex. The 4th lens (404) may be made of plastic material and may have an aspherical surface. The aspherical coefficients of the 7th surface (S7) and the 8th surface (S8) may be provided as L4S1 and L4S2 of FIG. 24. At least one or both of the 7th surface (S7) and the 8th surface (S8) of the 4th lens (404) may be provided without a critical point from the optical axis to the end of the effective area.

[0521]

[0522] The fifth lens (405) may be positioned as the sixth lens from the object side. The fifth lens (405) may be positioned as the third lens from the sensor side. The fifth lens (405) may be positioned between the fourth lens (404) and the sixth lens (406). The fifth lens (405) may have a positive (+) refractive power. The fifth lens (405) may include plastic or glass materials. For example, the fifth lens (405) may be provided with a plastic material.

[0523] With respect to the optical axis (OA), the fifth lens (405) may have a concave ninth surface (S9) on the object side and a convex tenth surface (S10) on the sensor side. The fifth lens (405) may have a meniscus shape with the object side being concave. The fifth lens (405) may have a meniscus shape with the sensor side being convex. The fifth lens (405) is made of plastic material and may have an aspherical surface. The aspherical coefficients of the ninth surface (S9) and the tenth surface (S10) may be provided as L5S1 and L5S2 of FIG. 24. At least one or both of the ninth surface (S9) and the tenth surface (S10) of the fifth lens (405) may be provided without a critical point from the optical axis to the end of the effective area.

[0524]

[0525] The sixth lens (406) may be positioned as the seventh lens from the object side. The sixth lens (406) may be positioned as the second lens from the sensor side. The sixth lens (406) may be positioned between the fifth lens (405) and the seventh lens (407). The sixth lens (406) may have a negative (-) refractive power. The sixth lens (406) may include plastic or glass materials. For example, the sixth lens (406) may be provided with a plastic material.

[0526] With respect to the optical axis (OA), the 6th lens (406) may have a concave 9th surface (S9) on the object side and a concave 10th surface (S10) on the sensor side. The 6th lens (406) may have a shape with both sides concave. The 6th lens (406) may be made of plastic material and may have an aspherical surface. The aspherical coefficients of the 11th surface (S11) and the 12th surface (S12) may be provided as L6S1 and L6S2 of FIG. 24. At least one or both of the 11th surface (S11) and the 12th surface (S12) of the 6th lens (406) may be provided without a threshold point from the optical axis to the end of the effective area.

[0527]

[0528] The seventh lens (407) may be positioned furthest from the object side. The seventh lens (407) may be positioned closest to the sensor side. The seventh lens (407) may have a positive (+) refractive power. The seventh lens (407) may include plastic or glass material. For example, the seventh lens (407) may be provided with plastic material.

[0529] With respect to the optical axis (OA), the 7th lens (407) may have a convex 13th surface (S13) on the object side and a concave 14th surface (S14) on the sensor side. The 7th lens (407) may have a meniscus shape with the object side being convex. The 7th lens (407) may have a meniscus shape with the sensor side being concave. The 7th lens (407) is made of plastic material and may have an aspherical surface. The aspherical coefficients of the 13th surface (S13) and the 14th surface (S14) may be provided as L7S1 and L7S2 of FIG. 24.

[0530] The 13th surface (S13) of the 7th lens (307) may have a critical point from the optical axis to the end of the effective area. When the 13th surface (S13) has a critical point, it may be located in the range of 90% to 95% of the effective radius from the optical axis, preferably in the range of 90% to 93%. For example, the critical point of the 13th surface (S13) may be located at approximately 91% of the effective radius from the optical axis. The 14th surface (S14) of the 7th lens (307) may have a critical point from the optical axis to the end of the effective area. When the 14th surface (S14) has a critical point, it may be located in the range of 70% to 80% of the effective radius from the optical axis, preferably in the range of 70% to 75%. For example, the critical point of the 14th surface (S14) may be located at approximately 74% of the effective radius from the optical axis.

[0531] The critical points of the 13th surface (S13) and the 14th surface (S14) are points where the sign of the slope value with respect to the optical axis and the direction perpendicular to the optical axis changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean points where the slope value is 0. Additionally, the critical point of the 14th surface (S14) may be a point where the slope value of the tangent line passing through the lens surface increases and then decreases, or decreases and then increases.

[0532]

[0533] LensSurfaceRadiusThicknessndvdClearAperture1S19.5221.3521.57433.1566.900 S254.2720.918 6.6062S3-38.1710.5001.62025.8356.296 S416.4950.730 6.179prism1P1 3.740 6.800 P2 3.900 6.2623S55.7961.5001.53655.6996.291 S6-1152.4000.917 6.1864S7-5.9371.5001.67819.2305.927 S8-6.956 Variable (D1) 5.5005S9-100.0001.4881.67819.2305.515 S10-8.3700.500 5.7266S11-2.3550.4001.61824.4335.595 S1230.5170.500 5.4577S132.8971.5001.58532.5905.581 S1411.255Variable(D2) 6.067Filter 0.210 7.387 0.300 7.408image 7.456

[0534] Table 10 shows the surface number, radius of curvature, thickness of the center of each lens or distance between lens surfaces, index, nd, Abbe number (Abbe,vd), clear aperture, and focal length of the lens according to the fourth embodiment of the present invention. At this time, the units of the radius of curvature and the thickness or distance may be mm.

[0535] In Table 10, the thickness of the optical path control member (411) may refer to the thickness along the optical axis (OA). For example, the thickness of the optical path control member (411) may refer to the sum of the thickness from the incident surface (P1) to the reflection surface (RS1) along the y-axis and the thickness from the reflection surface (RS1) to the exit surface (P2) along the x-axis. Additionally, the thickness from the incident surface (P1) to the reflection surface (RS1) along the y-axis of the optical path control member (411) and the thickness from the reflection surface (RS1) to the exit surface (P2) along the x-axis of the optical path control member (411) may be the same. According to a variation, the thickness from the incident surface (P1) to the reflection surface (RS1) along the y-axis of the optical path control member (411) and the thickness from the reflection surface (RS1) to the exit surface (P2) along the x-axis of the optical path control member (411) may be different.

[0536] Although not listed in Table 10, if the optical path control member (411) is a prism lens, it may have a refractive index and an Abbe number depending on the material forming the prism lens. The optical path control member (411) may be a mirror as the optical path control member.

[0537]

[0538] 1st mode 2nd mode D10.8493.047D29.1896.991

[0539] Table 11 relates to the spacing between lenses (D1, D2) that varies when operating in either the first mode or the second mode in the optical system according to the fourth embodiment of the present invention. Here, the first mode refers to the case of photographing an object located at infinity, and the second mode may refer to the case of photographing an object located at a macroscopic distance (e.g., within 200 mm).

[0540] In the optical system according to the fourth embodiment, the distance between adjacent lens groups may change during the process of changing from the first mode to the second mode. The third lens group (LG3) may move, while the first lens group (LG1) and the second lens group (LG2) may be fixed. The third lens group (LG3) may be a moving group, and the first lens group (LG1) and the second lens group (LG2) may be fixed groups.

[0541] When operating from the first mode to the second mode, the distance (D1) between the second lens group (LG2) and the third lens group (LG3) may increase, and the distance (D2) between the third lens group (LG3) and the image sensor (500) may decrease. When operating from the second mode to the first mode, the distance (D1) between the second lens group (LG2) and the third lens group (LG3) may decrease, and the distance (D2) between the third lens group (LG3) and the image sensor (500) may increase. The stroke length of the third lens group (LG3) may satisfy 0.5 mm to 1.5 mm, and preferably, may satisfy about 0.960 mm. As the third lens group (LG3) moves, the optical performance of the optical system (1300) may change.

[0542]

[0543] EFL(f)19.500FOV20.339LG3_stroke2.198BFL_19.189f119.902BFL_26.991f2-18.523EPD6.900f310. 770ET10.667f4-147.390ET21.028f513.392ET30.715f6-3.521ET41.586f76.249ET51.086f_LG1470.1 09ET61.413f_LG212.631ET71.018f_LG3-31.431TD_LG12.770CA_Max6.753TD_LG23.917CA_Min5.526T D_LG35.237CA_Aver5.988L_CT_max1.500ΣCT8.240L_CT_min0.400TTL29.993L_CT_aver1.177Fno2.826 ImgH7.456

[0544] Table 12 relates to the items of the mathematical formulas described above in the optical system (1300) of the fourth embodiment, including the effective focal length (EFL(F)(mm)) of the optical system (1300), the size of the entrance pupil (EPD(mm)), the distance from the sensor side of the last lens to the image sensor in the first mode (BFL_1(mm)), the distance from the sensor side of the last lens to the image sensor in the second mode (BFL_2(mm)), the angle of view (FOV(degree)), the focal lengths (f1~f7)(mm) of the first to seventh lenses (401~407), the edge thicknesses (ET1~ET7), the length of each lens group in the optical axis direction (TD_LG1, TD_LG2, TD_LG3), the focal lengths (f_LG1, f_LG2, f_LG3)(mm) of the first to third lens groups (LG1, LG2, LG3), and from the first lens (401). This relates to the optical axis distance (TD(mm)) to the 7th lens (407), the stroke length (LG3_stroke) of the 3rd lens group (LG3), the total optical axis distance of the optical system (1200) TTL(mm), ImgH(mm), the maximum effective diameter (CA_Max), the minimum effective diameter (CA_Min), the average effective diameter (CA_Aver), the maximum center thickness (L_CT_max), the minimum center thickness (L_CT_min), the average center thickness (L_CT_aver), the F-number (Fno), etc. among the 1st to 7th lenses (401~407).

[0545]

[0546] In the following, the center thickness of the first to seventh lenses (401 to 407) is denoted as CT1 to CT7, the edge thickness of the effective area of ​​each lens is denoted as ET1 to ET7, and the center gap between two adjacent lenses is denoted as CG1 to CG6. BFL (Back focal length) is the optical axis distance from the image sensor (500) to the center of the last lens. TTL is the optical axis distance from the center of the first surface (S1) of the first lens (401) to the top surface of the image sensor (500). In the following, the description of the relationship between the optical path control members (411) is partially omitted.

[0547]

[0548] When comparing the absolute values ​​of the radius of curvature of each lens, the radius of curvature of the 6th surface (S6) of the third lens (403) at the optical axis (OA) may be the maximum among the lenses, and the radius of curvature of the 13th surface (S13) of the seventh lens (407) may be the minimum among the lenses. The absolute value of the radius of curvature of the 1st surface (S1) of the first lens (401) may be smaller than the absolute value of the radius of curvature of the 2nd surface (S2). The absolute value of the radius of curvature of the 3rd surface (S3) of the second lens (402) may be larger than the absolute value of the radius of curvature of the 4th surface (S4). The absolute value of the radius of curvature of the 5th surface (S5) of the third lens (403) may be smaller than the absolute value of the radius of curvature of the 6th surface (S6). The absolute value of the radius of curvature of the 7th surface (S7) of the 4th lens (404) may be smaller than the absolute value of the radius of curvature of the 8th surface (S8). The absolute value of the radius of curvature of the 9th surface (S9) of the 5th lens (405) may be larger than the absolute value of the radius of curvature of the 10th surface (S10). The absolute value of the radius of curvature of the 11th surface (S11) of the 6th lens (406) may be smaller than the absolute value of the radius of curvature of the 12th surface (S12). The absolute value of the radius of curvature of the 13th surface (S13) of the 7th lens (407) may be smaller than the absolute value of the radius of curvature of the 14th surface (S14).

[0549] The ratio of the radius of curvature of each lens can satisfy the following conditions.

[0550] Condition 1: 0.1 < |L1R1 / L1R2| < 0.5

[0551] Condition 2: 2 < |L2R1 / L2R2| < 2.5

[0552] Condition 3: 0.001 < |L3R1 / L3R2| < 0.01

[0553] Condition 4: 0.5 < |L4R1 / L4R2| < 1

[0554] Condition 5: 10 < |L5R1 / L5R2| < 15

[0555] Condition 6: 0.01 < |L6R1 / L6R2| < 0.1

[0556] Condition 7: 0.1 < |L7R1 / L7R2| < 0.5

[0557]

[0558] When describing the center thickness of the lenses based on the optical axis, the center thickness (CT3, CT4, CT7) of the third lens (403), the fourth lens (404), and the seventh lens (407) is the maximum among the lenses, and the center thickness (CT6) of the sixth lens (406) is the minimum among the lenses. The difference between the maximum center thickness and the minimum center thickness among the lenses may be in the range of 1.0 mm or more and 1.5 mm or less.

[0559] The center thickness of each lens can satisfy any one of the following conditions.

[0560] Condition 1: CT3, CT4, CT5, CT7 > CT1 > CT2, CT6

[0561] Condition 2: CT1, CT3, CT4, CT5, CT7 > CT2 > CT6

[0562] Condition 3: CT3 = CT4 = CT7 > CT1, CT2, CT5, CT6

[0563] Condition 4: CT3, CT4, CT7 > CT5 > CT1, CT2, CT6

[0564] Condition 5: CT1, CT2, CT3, CT4, CT5, CT7 > CT6

[0565]

[0566] When zooming, the gap (CG1) between the first lens (401) and the second lens (402), the gap (CG3) between the third lens (403) and the fourth lens (404), the gap (CG5) between the fifth lens (405) and the sixth lens (406), and the gap (CG6) between the sixth lens (406) and the seventh lens (407) do not change, while the gap (CG4) between the fourth lens (404) and the fifth lens (405) may change. Among the center gaps between the lenses that do not change, the gap (CG1) between the first lens (401) and the second lens (402) is maximum, and the gap (CG5) between the fifth lens (405) and the sixth lens (406), and the gap (CG6) between the sixth lens (406) and the seventh lens (407) may be minimum. The difference between the maximum center gap and the minimum center gap among the spaced-out lens gaps may be 0.3 mm or more, for example, in the range of 0.3 mm to 0.5 mm.

[0567] The center spacing between each lens can satisfy the following conditions.

[0568] Condition 1: CG1 > CG3, CG5, CG6

[0569] Condition 2: CG1 > CG3 > CG5, CG6

[0570] Condition 3: CG1, CG3 > CG5 = CG6

[0571]

[0572] Regarding the effective aperture, the lens having the maximum effective aperture may be the first lens (401). Here, the effective aperture is the average of the effective aperture on the object side and the effective aperture on the sensor side of each lens. The lens surface having the maximum effective aperture may be the first surface (S1) of the first lens (401). The lens having the minimum effective aperture may be the sixth lens (406). The lens surface having the minimum effective aperture may be the twelfth surface (S12) of the sixth lens (406). The effective apertures of the first to seventh lenses (401-407) may be smaller than the diagonal length of the image sensor (500).

[0573] The effective diameter of each lens can satisfy any one of the following conditions.

[0574] Condition 1: CA_L1 > CA_L2, CA_L3, CA_L4, CA_L5, CA_L6, CA_L7

[0575] Condition 2: CA_L1, CA_L3 > CA_L2 > CA_L4, CA_L5, CA_L6, CA_L7

[0576] Condition 3: CA_L1 > CA_L3 > CA_L2, CA_L4, CA_L5, CA_L6, CA_L7

[0577] Condition 4: CA_L1, CA_L2, CA_L3, CA_L7 > CA_L4 > CA_L5, CA_L6

[0578] Condition 5: CA_L1, CA_L2, CA_L3, CA_L4, CA_L7 > CA_L5 > CA_L6

[0579] Condition 6: CA_L1, CA_L2, CA_L3, CA_L4, CA_L5, CA_L7 > CA_L6

[0580] Condition 7: CA_L1, CA_L2, CA_L3 > CA_L7 > CA_L4, CA_L5, CA_L6

[0581]

[0582] Regarding the refractive index, the refractive index of the fourth lens (404) and the fifth lens (405) is the maximum among the lenses and may be greater than 1.6, for example, greater than 1.65. The third lens (403) may have the minimum refractive index among the lenses. For example, the refractive index of the third lens (403) may be the minimum among the lenses and may be less than 1.6, for example, less than 1.55. The difference between the maximum refractive index and the minimum refractive index may be 0.1 or greater.

[0583] The refractive index of each lens can satisfy any one of the following conditions.

[0584] Condition 1: n2, n4, n5, n6, n7 > n1 > n3

[0585] Condition 2: n4, n5 > n2 > n1, n3, n6, n7

[0586] Condition 3: n1, n2, n4, n5, n6, n7 > n3

[0587] Condition 4: n4 = n5 > n1, n2, n3, n6, n7

[0588] Condition 5: n2, n4, n5 > n6 > n1, n3, n7

[0589] Condition 6: n2, n4, n5, n6 > n7 > n1, n3

[0590]

[0591] When comparing the Abbe numbers, the Abbe number of the third lens (403) is the maximum among the lenses and may be 50 or more. The Abbe numbers of the fourth lens (404) and the fifth lens (405) are the minimum among the lenses and may be 20 or less. The difference between the maximum refractive index and the minimum Abbe number may be 30 or more.

[0592] The Abbe number of each lens can satisfy any one of the following conditions.

[0593] Condition 1: v3 > v1 > v2, v4, v5, v6, v7

[0594] Condition 2: v1, v3, v7 > v2 > v4, v5, v6

[0595] Condition 3: v3 > v1, v2, v4, v5, v6, v7

[0596] Condition 4: v1, v2, v3, v6, v7 > v4 = v5

[0597] Condition 5: v1, v2, v3, v7 > v6 > v4, v5

[0598] Condition 6: v1, v3 > v7 > v2, v4, v5, v6

[0599]

[0600] The focal lengths (F1, F3, F5, F7) of the 1st, 3rd, 5th, and 7th lenses (401, 403, 405, 407) may have a positive (+) sign. The 1st, 3rd, 5th, and 7th lenses (401, 403, 405, 407) may have a positive (+) refractive power. The focal lengths (F2, F4, F6) of the 2nd, 4th, and 6th lenses (402, 404, 406) may have a negative (-) sign. The 2nd, 4th, and 6th lenses (402, 404, 406) may have a negative (-) refractive power.

[0601] When comparing the focal lengths in absolute values, the focal length of the fourth lens (404) is the maximum among the lenses and may be 100 or more and 150 or less. The focal length of the sixth lens (406) is the minimum among the lenses, and the absolute value of the focal length of the sixth lens (406) may be 2 or more and 5 or less.

[0602] The absolute value of the focal length of each lens can satisfy any one of the following conditions.

[0603] Condition 1: |f4| > |f1| > |f2|, |f3|, |f5|, |f6|, |f7|

[0604] Condition 2: |f1|, |f4| > |f2| > |f3|, |f5|, |f6|, |f7|

[0605] Condition 3: |f1|, |f2|, |f4|, |f5| > |f3| > |f6|, |f7|

[0606] Condition 4: |f4| > |f1|, |f2|, |f3|, |f5|, |f6|, |f7|

[0607] Condition 5: |f1|, |f2|, |f4| > |f5| > |f3|, |f6|, |f7|

[0608] Condition 6: |f1|, |f2|, |f3|, |f4|, |f5|, |f7| > |f6|

[0609] Condition 7: |f1|, |f2|, |f3|, |f4|, |f5| > |f7| > |f6|

[0610]

[0611] The combined focal length (f_LG1) of the first lens group (LG1) can have a positive (+) sign. The first lens group (LG1) can have a positive (+) combined refractive power. The combined focal length (f_LG2) of the second lens group (LG2) can have a positive (+) sign. The second lens group (LG2) can have a positive (+) combined refractive power. The combined focal length (f_LG3) of the third lens group (LG3) can have a negative (-) sign. The third lens group (LG3) can have a negative (-) combined refractive power. Through this, light incident from the object side can move away from the optical axis direction and then converge back towards the optical axis direction, thereby forming a stable optical path.

[0612] When comparing the combined focal lengths of the first to third lens groups (LG1, LG2, LG3) in absolute terms, the combined focal length of the first lens group (LG1) may be the largest, and the combined focal length of the second lens group (LG2) may be the smallest. The relationship between the combined focal lengths of the first and second lens groups (LG1, LG2, LG3) may satisfy |f_LG1| > |f_LG3| > |f_LG2|.

[0613]

[0614] The thickness of the first lens (401) may have a difference between the maximum and minimum thickness of at least twice, for example, in the range of 2 to 2.5 times, with the center thickness (CT1) being maximum and the edge thickness (ET1) being minimum. The thickness (T2) of the second lens (402) may be minimum at the center and maximum at the edge, with the maximum thickness being in the range of 2 to 2.5 times the minimum thickness. The thickness (T3) of the third lens (403) may be maximum at the center and minimum at the edge, with the maximum thickness being in the range of 2 to 2.5 times the minimum thickness. The thickness (T4) of the fourth lens (404) may be minimum at the center and maximum at the edge, with the maximum thickness being in the range of 1 to 1.5 times the minimum thickness. The thickness (T5) of the fifth lens (405) may be maximum at the center and minimum at the edge, with the maximum thickness being in the range of 1 to 1.5 times the minimum thickness. The thickness (T6) of the sixth lens (406) may be minimum at the center and maximum at the edge, and the maximum thickness is in the range of 3.5 to 4 times the minimum thickness. The thickness (T7) of the seventh lens (407) may be maximum at the center and minimum at the edge, and the maximum thickness is in the range of 1 to 1.5 times the minimum thickness.

[0615]

[0616] The thickness of each lens can satisfy any one of the following conditions.

[0617] Condition 1: 2 < CT1 / ET1 < 2.5, 0.1 < ET1 / CT1 < 0.5

[0618] Condition 2: 0.1 < CT2 / ET2 < 0.5, 2 < ET2 / CT2 < 2.5

[0619] Condition 3: 2 < CT3 / ET3 < 2.5, 0.1 < ET3 / CT3 < 0.5

[0620] Condition 4: 0.5 < CT4 / ET4 < 1, 1 < ET4 / CT4 < 1.5

[0621] Condition 5: 1 < CT5 / ET5 < 1.5, 0.5 < ET5 / CT5 < 1

[0622] Condition 6: 0.1 < CT6 / ET6 < 0.5, 3.5 < ET6 / CT6 < 4

[0623] Condition 7: 1 < CT7 / ET7 < 1.5, 0.5 < ET7 / CT7 < 1

[0624] Condition 8: 1 < ΣCT / ΣET < 1.5, 0.5 < ΣET / ΣCT < 1

[0625]

[0626] Among the gaps between lenses (G1, G2, G3, G4, G5, G6) having gaps between adjacent lenses, the gap (LG1) between the first and second lenses (401, 402) may have a maximum center and a minimum edge. The gap (LG3) between the third and fourth lenses (403, 404) may have a maximum center and a minimum edge. The gap (G4) between the fourth and fifth lenses (404, 405) may have a maximum edge and a minimum center. The fifth gap (G5) between the fifth and sixth lenses (405, 406) may have a maximum center and a minimum edge. The sixth gap (G6) between the sixth and seventh lenses (406, 407) may have a maximum center and a minimum edge.

[0627]

[0628] FIG. 25 is a graph showing the aberration characteristics in the first mode of the optical system according to the fourth embodiment of the present invention, and FIG. 26 is a graph showing the aberration characteristics in the second mode of the optical system according to the fourth embodiment of the present invention. The aberration graphs in FIG. 25 and FIG. 26 show the longitudinal spherical aberration, astigmatic field curves, and distortion measured from left to right. In FIG. 25 and FIG. 26, the X-axis may represent the focal length (mm) and distortion (%), and the Y-axis may represent the height of the image. Additionally, the graph for longitudinal spherical aberration is for light in the wavelength bands of approximately 435 nm, approximately 470 nm, approximately 510 nm, approximately 555 nm, approximately 610 nm, and 650 nm, and the graphs for astigmatic field curves and distortion are for light in the wavelength band of approximately 555 nm. In the aberration diagrams of FIGS. 25 and 26, it can be interpreted that the closer each curve is to the Y-axis, the better the aberration correction function is. In the optical system (1300) according to the fourth embodiment, it can be seen that the measured values ​​are adjacent to the Y-axis in almost all areas. That is, the optical system (1300) according to the fourth embodiment has improved resolution and can have good optical performance not only in the center of the field of view (FOV) but also in the periphery.

[0629]

[0630] FIG. 27 is a graph showing the relative illumination ratio (Relative Illumination Versus Relative Field) of the optical system according to the fourth embodiment of the present invention operating in the first mode, and FIG. 28 is a graph showing the relative illumination ratio of the optical system according to the fourth embodiment of the present invention operating in the second mode. FIG. 27 and FIG. 28 are graphs showing the relative illumination ratio or relative illumination (RI) from the center of the image sensor in the optical system to the image height, i.e., from 0 to the maximum height (MaxF = 1F). It can be seen that a relative illumination ratio of 40% or more, for example, exceeding 50%, appears from the center of the image sensor to the diagonal end (1.0F). That is, it can be seen that there is almost no difference in the relative illumination between the first mode and the second mode of the fourth embodiment of the present invention from the optical axis to the end of the effective area. Accordingly, since the minimum light intensity from the center to the end of the image sensor exceeds 40%, more accurate sensing values ​​can be obtained across the entire area of ​​the image sensor.

[0631]

[0632] The optical system (1000, 1100, 1200, 1300) according to the first to fourth embodiments disclosed above may satisfy at least one or two of the mathematical formulas described below. Accordingly, the optical system (1000, 1100, 1200, 1300) according to the first to fourth embodiments may have improved optical characteristics. For example, if the optical system (1000, 1100, 1200, 1300) satisfies at least one mathematical formula, the optical system (1000, 1100, 1200, 1300) can effectively control aberration characteristics such as chromatic aberration and distortion aberration, and may have good optical performance not only at the center of the field of view (FOV) but also at the periphery. In addition, the optical system (1000, 1100, 1200, 1300) may have improved resolution. In addition, regarding the meaning of the thickness of the lens at the optical axis (OA) and the spacing of adjacent lenses at the optical axis (OA) as described in the mathematical formulas, one may refer to the first to fourth embodiments disclosed above.

[0633]

[0634] [Mathematical Formula 1]

[0635] 0.5 < TD_LG1 / TD_LG2 < 1.5

[0636] Equation 1 can establish a relationship between the length (TD_LG1) of the first lens group (LG1) and the length (TD_LG2) of the second lens group (LG2) in the direction of the optical axis. Equation 1 is a condition for reducing aberrations and improving optical performance. The first lens group (LG1) and the second lens group (LG2) satisfying Equation 1 can appropriately correct astigmatism aberration and coma aberration. In addition, the overall length of the zoom optical system having an appropriate zoom magnification can be reduced. In the first to fourth embodiments of the present invention, Equation 1 can preferably satisfy 0.6 < TD_LG1 / TD_LG2 < 1.2.

[0637]

[0638] [Mathematical Formula 2]

[0639] 1 < |f_LG1 / f_(LG2+LG3)| < 100

[0640] Equation 2 can establish a relationship between the focal length (f_LG1) of the first lens group (LG1) and the combined focal length (f_(LG2+LG3)) of the second lens group (LG2) and the third lens group (LG3). Equation 2 is a condition for reducing aberrations and improving optical performance. The first lens group (LG1), the second lens group (LG2), and the third lens group (LG3) satisfying Equation 2 can appropriately correct astigmatism aberration and coma aberration. In the first, second, and fourth embodiments, Equation 2 can preferably satisfy 1 < |f_LG1 / f_(LG2+LG3)| < 3, and in the third embodiment, it can preferably satisfy 90 < |f_LG1 / f_(LG2+LG3)| < 100.

[0641]

[0642] [Mathematical Formula 3]

[0643] 25 < Ave_ABV < 50

[0644] In Equation 3, Ave_ABV is the average of the Abbe numbers of the lenses included in the optical system (1000, 1100, 1200, 1300). When Equation 3 is satisfied, optical performance can be improved by appropriately setting the factors affecting chromatic aberration. In the first to fourth embodiments, Equation 3 can preferably satisfy 28 < Ave_ABV < 47.

[0645]

[0646] [Mathematical Formula 4]

[0647] 1.5 < Ave_Ind < 1.65

[0648] In Equation 4, Ave_Ind is the average of the refractive indices of the lenses included in the optical system (1000, 1100, 1200, 1300). When Equation 4 is satisfied, optical performance can be improved by appropriately setting the factors affecting chromatic aberration. In the first to fourth embodiments, Equation 4 can preferably satisfy 1.54 < Ave_Ind < 1.62.

[0649]

[0650] [Mathematical Formula 5]

[0651] 1 < CA_L1 / CA_L3 < 1.5

[0652] In Equation 5, CA_L1 is the average value of the effective diameter of the object side (S1) of the first lens (101, 201, 301, 401) and the effective diameter of the sensor side (S2), and CA_L3 is the average value of the effective diameter of the object side (S3) of the third lens (103, 203, 303, 403) and the effective diameter of the sensor side (S4). Equation 5 is a condition for OIS correction by tilting the prism lens; if it is below the lower limit, there is a problem of significant reduction in resolution when correcting OIS through prism lens tilting, and if it exceeds the upper limit, there is a problem of Fno becoming larger. In the first to fourth embodiments, Equation 5 can preferably satisfy 1 < CA_L1 / CA_L3 < 1.3.

[0653]

[0654] [Mathematical Formula 6]

[0655] 0.3 < TTL / |f1| < 2.5

[0656] In Equation 6, TTL (Total track length) refers to the distance (mm) along the optical axis (OA) from the center of the first surface (S1) of the first lens (101, 201, 301, 401) to the top surface of the image sensor (500), and f1 is the focal length of the first lens (101, 201, 301, 401). When Equation 6 is satisfied, the optical system (1000, 1100, 1200, 1300) can have a set angle of view and an appropriate focal length. If it is below the lower limit of Equation 6, the lenses become longer in terms of effective aperture or TTL, which may cause a problem where the imaging lens system becomes larger. When the upper limit of Equation 6 is exceeded, the influence of the first lens (101, 201, 301, 401) in the entire optical system decreases, and it is necessary to increase the refractive power of the lenses, which causes a problem in that it becomes difficult to correct spherical aberration or distortion aberration. In the first to fourth embodiments, Equation 6 can preferably satisfy 0.3 < TTL / |f1| < 2.2.

[0657]

[0658] [Mathematical Formula 7]

[0659] 0.001 < EFL(F) / f_LG1 < 0.2

[0660] In Equation 7, EFL(F) is the total focal length of the optical system (1000, 1100, 1200, 1300), and f_LG1 is the focal length of the first lens group (LG1). When Equation 7 is satisfied, the optical system (1000, 1100, 1200, 1300) can have a set angle of view and an appropriate focal length, and the angle of view can be set large within an appropriate TTL range. If it is below the lower limit of Equation 7, the effective aperture or TTL of the lenses becomes longer, which may cause a problem where the imaging lens system becomes large. If it exceeds the upper limit of Equation 7, the influence of the first lens group (LG1) in the entire optical system decreases, and it is necessary to increase the refractive power of the lenses, which makes it difficult to correct spherical aberration or distortion aberration. In the first to fourth embodiments, mathematical formula 7 can preferably satisfy 0.001 < EFL(F) / f_LG1 < 0.15.

[0661]

[0662] [Mathematical Formula 8]

[0663] 1 < f1 / L1R1 < 9

[0664] In Equation 8, f1 is the focal length of the first lens (101, 201, 301, 401), and L1R1 is the radius of curvature of the object side surface (S1) of the first lens (101, 201, 301, 401). When Equation 8 is satisfied, the optical path of the first lens (101, 201, 301, 401) incident on the optical system (1000, 1100, 1200, 1300) can be appropriately designed to reduce the overall size of the optical system (1000, 1100, 1200, 1300) and control aberrations. In the first to fourth embodiments of the present invention, Equation 8 can preferably satisfy 1 < f1 / L1R1 < 8.5.

[0665]

[0666] [Mathematical Formula 9]

[0667] 1 < TTL / f1 < 2

[0668] In Equation 9, TTL (Total track length) refers to the distance (mm) along the optical axis (OA) from the center of the first surface (S1) of the first lens (101, 201, 301, 401) to the top surface of the image sensor (500), and f1 is the focal length of the first lens (101, 201, 301, 401). When Equation 9 is satisfied, the optical system (1000, 1100, 1200, 1300) can have a set angle of view and an appropriate focal length. If it is below the lower limit of Equation 9, the lenses become longer in terms of effective aperture or TTL, which may cause a problem where the imaging lens system becomes larger. When the upper limit of Equation 9 is exceeded, the influence of the first lens (101, 201, 301, 401) in the entire optical system decreases, and it is necessary to increase the refractive power of the lenses, which makes it difficult to correct spherical aberration or distortion aberration. In the first to fourth embodiments, Equation 9 can preferably satisfy 1.5 < TTL / f1 < 1.6.

[0669]

[0670] [Mathematical Formula 10]

[0671] 0.1 < |f1|-|f2| < 10

[0672] In mathematical formula 10, f1 is the focal length of the first lens (101, 201, 301, 401), and f2 is the focal length of the second lens (102, 202, 302, 402). By making the signs of the focal lengths of the two lenses included in the first lens group (LG1) positioned on the object side of the optical path control member (111, 211, 311, 411) different and designing the difference between the focal lengths of the two lenses small, the path of the light emitted from the first lens group (LG1) and incident on the optical path control member (111, 211, 311, 411) and the path of the light emitted from the optical path control member (111, 211, 311, 411) to the second lens group (LG2) can be set parallel to the optical axis. Through this, when tilt control is performed by driving the first lens group (LG1) and the optical path control member (111, 211, 311, 411) via OIS, the degradation of optical performance due to changes in the optical path can be minimized. In the first to fourth embodiments, Equation 10 can preferably satisfy 0.4 < |f1|-|f2| < 9.

[0673]

[0674] [Mathematical Formula 11]

[0675] 0.1 < |f_LG2 / f_LG3| <

[0676] Equation 11 can establish the relationship between the focal length (f_LG2) of the second lens group (LG2) and the focal length (f_LG3) of the third lens group (LG3). Equation 11 is a condition for reducing aberrations and improving optical performance. The second lens group (LG2) and the third lens group (LG3) satisfying Equation 11 can appropriately correct astigmatism aberration and coma aberration. In the first to fourth embodiments of the present invention, Equation 11 can preferably satisfy 0.3 < |f_LG2 / f_LG3| < 3.

[0677]

[0678] [Mathematical Formula 12]

[0679] 15 < |f_LG3| < 35

[0680] In Equation 12, f_LG3 is the focal length of the third lens group (LG3). Equation 12 is a condition for reducing aberrations and improving optical performance. In the first to fourth embodiments of the present invention, Equation 12 can preferably satisfy 18 < |f_LG3| < 32.

[0681]

[0682] [Mathematical Formula 13]

[0683] 0.8 < LG3_stroke < 2.5

[0684] Equation 13 can set a range for the stroke length (LG3_stroke) of the third lens group (LG3). If the upper limit of Equation 13 is exceeded, the stroke length of the third lens group (LG3) increases during focusing, making it difficult to miniaturize the optical system. If the lower limit of Equation 13 is less than, the focusing performance of the optical system may be degraded. In the first to fourth embodiments of the present invention, Equation 13 can preferably satisfy 0.8 < LG3_stroke < 2.4.

[0685]

[0686] [Mathematical Formula 14]

[0687] 25 < TTL < 35

[0688] In Equation 14, TTL (Total track length) refers to the distance (mm) along the optical axis (OA) from the center of the first surface (S1) of the first lens (101, 201, 301, 401) to the top surface of the image sensor (500). In the first to fourth embodiments, Equation 14 can preferably satisfy 28 < TTL < 32.

[0689]

[0690] [Mathematical Formula 15]

[0691] 7 < ImgH < 8

[0692] In Equation 15, ImgH represents the maximum diagonal length of the image sensor (500). Equation 15 can set the diagonal size (ImgH) of the image sensor (500) and can provide an optical system having a large mobile image sensor size. In the first to fourth embodiments, Equation 15 preferably satisfies 7 < ImgH < 7.5.

[0693]

[0694] [Mathematical Formula 16]

[0695] 20 < FOV < 30

[0696] In Equation 16, FOV represents the angle of view of the optical system. Equation 16 can provide an angle of view suitable for a mobile optical system. In the first to fourth embodiments, the FOV can preferably satisfy 20 < FOV < 25.

[0697]

[0698] [Mathematical Formula 17]

[0699] 4 < TTL / CA_max < 5

[0700] In Equation 17, CA_max represents the largest effective diameter (mm) among the object side and sensor side of the plurality of lenses, and TTL (Total track length) represents the distance (mm) along the optical axis (OA) from the vertex of the first surface (S1) of the first lens (101, 201, 301, 401) to the top surface of the image sensor (500). Equation 17 establishes the relationship between the total optical axis length of the optical system and the maximum effective diameter, thereby providing an improved mobile optical system. In the first to fourth embodiments, Equation 17 preferably satisfies 4.3 < TTL / CA_max < 4.6.

[0701]

[0702] [Mathematical Formula 18]

[0703] 3 < TTL / ImgH < 5

[0704] In Equation 18, TTL (Total track length) refers to the distance (mm) along the optical axis (OA) from the vertex of the first surface (S1) of the first lens (101, 201, 301, 401) to the top surface of the image sensor (500), and ImgH refers to the maximum diagonal length of the image sensor (500). When Equation 18 is satisfied, the optical system (1000, 1100, 1200, 1300) can have a TTL for application to the mobile image sensor (500), thereby providing improved image quality. If it is below the lower limit of Equation 18, it is necessary to increase the refractive power of the lenses, making it difficult to correct spherical aberration or distortion aberration; if it exceeds the upper limit of Equation 18, the effective aperture or TTL of the lenses becomes longer, which may cause a problem where the imaging lens system becomes larger. In the first to fourth embodiments, mathematical formula 18 can preferably satisfy 3.8 < TTL / ImgH < 4.2.

[0705]

[0706] [Mathematical Formula 19]

[0707] 2 < EFL(F) / ImgH < 3

[0708] In Equation 19, EFL(F) is the total effective focal length of the optical system (1000, 1100, 1200, 1300), and ImgH represents the maximum diagonal length of the image sensor (500). When Equation 19 is satisfied, the mobile image sensor (500) may have improved aberration characteristics in terms of size. In the first to fourth embodiments, Equation 19 preferably satisfies 2.5 < EFL(F) / ImgH < 3.

[0709]

[0710] [Mathematical Formula 20]

[0711] 0.1 < ΣCT / TTL < 1

[0712] Equation 20 can establish a relationship between the sum of the center thicknesses of the lenses (ΣCT) and the distance (TTL) from the vertex of the first surface (S1) of the first lens (101, 201, 301, 401) to the upper surface of the image sensor (500) along the optical axis (OA). If the upper limit of Equation 20 is exceeded, the number of lenses increases, and the movement of the moving lens group in the optical system may become disadvantageous. If the lower limit of Equation 20 is not met, the focusing performance of the optical system may be degraded. In the first to fourth embodiments, Equation 20 preferably satisfies 0.1 < ΣCT / TTL < 0.5.

[0713]

[0714] [Mathematical Formula 21]

[0715] 1 < CA_max / CA_min < 2

[0716] In Equation 21, CA_max represents the maximum effective diameter among the object sides and sensor sides of the lenses, and CA_min represents the minimum effective diameter among the object sides and sensor sides of the lenses. When Equation 21 is satisfied, the optical system can set a size for a slim and compact structure while maintaining optical performance. In the first to fourth embodiments, Equation 21 preferably satisfies 1 < CA_max / CA_min < 1.5.

[0717]

[0718] [Mathematical Formula 22]

[0719] 0.1 < CA_max / ImgH < 1

[0720] In Equation 22, CA_max represents the maximum effective diameter among the object sides and sensor sides of the lenses, and ImgH represents the maximum diagonal length of the image sensor (500). When Equation 22 is satisfied, the optical system can maintain good optical performance and set a size for a slim and compact structure. In the first to fourth embodiments, Equation 22 preferably satisfies 0.5 < CA_max / ImgH < 1.

[0721]

[0722] [Mathematical Formula 23]

[0723] 0.1 < CA_min / ImgH < 1

[0724] In Equation 23, CA_min represents the minimum effective diameter among the object sides and sensor sides of the lenses, and ImgH represents the maximum diagonal length of the image sensor (500). When Equation 23 is satisfied, the optical system can maintain good optical performance and set a size for a slim and compact structure. In the first to fourth embodiments, Equation 23 preferably satisfies 0.5 < CA_min / ImgH < 1.

[0725]

[0726] [Mathematical Formula 24]

[0727]

[0728] In Equation 24, Z represents Sag, which can mean the distance in the direction of the optical axis from any position on the aspherical surface to the vertex of the aspherical surface. Y represents the distance in the direction perpendicular to the optical axis from any position on the aspherical surface to the optical axis. c can represent the curvature of the lens, and K can represent the conic constant. Additionally, A, B, C, D, E, and F can represent the aspheric constants.

[0729]

[0730] The optical system (1000, 1100, 1200, 1300) according to the first to fourth embodiments may satisfy at least one or two of the mathematical formulas 1 to 24. In this case, the optical system (1000, 1100, 1200, 1300) may have improved optical characteristics. Specifically, when the optical system (1000, 1100, 1200, 1300) satisfies at least one or two of the mathematical formulas 1 to 24, the optical system (1000, 1100, 1200, 1300) may have improved resolution and may improve aberration and distortion characteristics. Additionally, the optical system (1000, 1100, 1200, 1300) can secure a Back Focal Length (BFL) for applying the image sensor (400), compensate for the degradation of optical characteristics due to temperature changes, and minimize the gap between the last lens and the image sensor (400), thereby enabling good optical performance in the center and periphery of the field of view (FOV).

[0731]

[0732] Mathematical Formula Example 1 Example 2 Example 3 Example 4 Example 1 0.5 < TD_LG1 / TD_LG2 < 1.50.8951.1851.0320.70721< |f_LG1 / f_(LG2+LG3)| < 1002.8121.88099.81025.006325 < Ave_ABV < 5044.50246.24742.46330.02541.5 < Ave_Ind < 1.651.5561.5511.5691.61351 < CA_L1 / CA_L3 < 1.51.2001.2131.0841.08260.3 < TTL / |f1| < 2.51.9802.1240.4981.50770.001 < EFL(F) / f_LG1 < 0.20.1030.1320.0030.04181 < f1 / L1R1 < 91.6051.4628.2462.09091 < TTL / f1 < 21.5641.5281.5641.538100.1 < |f1|-|f2| < 100.7460.5048.4321.379110.1 < |f_LG2 / f_LG3| < 32.4842.8191.6180.4021215 < |f_LG3| < 3519.31620.62922.46931.431130.8 < LG3_stroke < 2.52.3022.3020.9602.1981425 < TTL < 3530.50029.79930.50029.993157 < ImgH < 87.4637.4657.4667.4561620 < FOV < 3020.29820.27320.29620.339174 < TTL / CA_max < 54.4494.3554.5534.442183 < TTL / ImgH < 54.0873.9924.0854.023192 < EFL(F) / ImgH < 32.6132.6122.6122.615200.1 < ΣCT / TTL < 10.2940.2840.3220.275211 < CA_max / CA_min < 21.4051.4041.3021.222220.1 < CA_max / ImgH < 10.9190.9170.8970.906230.1 < CA_min / ImgH < 10.6540.6530.6890.741.

[0733] Table 13 shows the result values ​​for the above-described Equations 1 to 23 in the optical system (1000, 1100, 1200, 1300) of the embodiment. Referring to Table 13, it can be seen that the optical system (1000, 1100, 1200, 1300) satisfies at least one, two or more, or three or more of Equations 1 to 23. Specifically, it can be seen that the optical system (1000, 1100, 1200, 1300) according to the embodiment satisfies all of Equations 1 to 23. Accordingly, the optical system (1000, 1100, 1200, 1300) can have good optical performance and excellent optical characteristics at the center and periphery of the field of view (FOV).

[0734]

[0735] FIG. 30 is an example of a portable terminal having an optical system according to the present embodiment. As illustrated in FIG. 30, the portable terminal (1500) may include a camera module (1520), a flash module (1530), and an autofocus device (1510) provided on one side or the rear side. Here, the autofocus device (1510) may include a surface-emitting laser element and a light receiver disclosed above as a light-emitting layer.

[0736] The flash module (1530) may include an emitter that emits light inside it. The flash module (1530) may be operated by the camera operation of the mobile terminal or by the control of the user. The camera module (1520) may include an image capturing function and an autofocus function. For example, the camera module (1520) may include an autofocus function using an image.

[0737] The autofocus device (1510) may include an autofocus function using a laser. The autofocus device (1510) may be primarily used under conditions where the autofocus function using the image of the camera module (1520) is degraded. Additionally, although not shown in the drawing, at least one additional camera module may be disposed on the front of the mobile terminal (1500). At least one of the camera modules within the mobile terminal may have the tele-type folded optical system disclosed above.

[0738] An optical system or camera module according to an embodiment of the invention, and a lens assembly according to various embodiments, may be applied to an electronic device employing an image sensor, for example. A lens assembly according to an exemplary embodiment may be applied to various electronic devices such as digital cameras, interchangeable lens cameras, video cameras, mobile phone cameras, cameras for small mobile devices, VR, AR, drones, or manned / unmanned aircraft.

[0739] The features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, etc. exemplified in each embodiment may be combined or modified and implemented in other embodiments by a person skilled in the art to which the embodiments belong. Therefore, details regarding such combinations and modifications should be interpreted as being included within the scope of the present invention.

[0740] Furthermore, although the invention has been described above with reference to embodiments, this is merely illustrative and does not limit the invention. Those skilled in the art will understand that various modifications and applications not exemplified above are possible within the scope of the essential characteristics of the embodiments. For example, each component specifically shown in the embodiments may be modified and implemented. Differences related to such modifications and applications should be interpreted as being included within the scope of the invention as defined in the appended claims.

Claims

1. Includes first to third lens groups arranged along the optical axis, and The above first lens group has a positive (+) refractive power, and The above second lens group has a positive (+) refractive power, and The above third lens group has a positive (+) refractive power, and It includes an optical path control member disposed between the first lens group and the second lens group, and The object side of the lens positioned closest to the object side in the second lens group on the above optical axis has a convex shape, and The first lens group and the optical path control member move via OIS, The above third lens group is an optical system that moves AF.

2. In Paragraph 1, The above first lens group includes a first lens and a second lens, and The object side of the first lens at the above optical axis has a convex shape, and An optical system in which the sensor side of the second lens at the above optical axis has a concave shape.

3. In Paragraph 2, The first lens above has a positive (+) refractive power, and The above second lens is an optical system having negative (-) refractive power.

4. In Paragraph 3, An optical system in which the difference in absolute value of the focal lengths of the first lens and the second lens is 0.1 or more and 10 or less.

5. In Paragraph 1, The above second lens group includes a third lens and a fourth lens, and The above third lens has a positive (+) refractive power, and The above-mentioned fourth lens is an optical system having negative (-) refractive power.

6. In Paragraph 1, The above third lens group includes a fifth lens, a sixth lens, and a seventh lens, and The above fifth lens has a negative (-) refractive power, and The above-mentioned sixth lens has a positive (+) refractive power, and The above seventh lens is an optical system having negative (-) refractive power.

7. In Paragraph 5, The optical system in which the fourth lens on the above optical axis has a meniscus shape that is convex toward the object.

8. In Paragraph 1, The lens positioned closest to the object side in the first lens group above is an optical system having a meniscus shape that is convex toward the object side.

9. In Paragraph 1, An optical system satisfying the following condition. <Condition> 0.8 < LG3_stroke < 2.5 (In the above conditional expression, LG3 is the stroke length of the third lens group.) 10. In Paragraph 2, An optical system satisfying the following condition. <Condition> 0.3 < TTL / |f1| < 2.5 (In the above conditional equation, TTL is the optical axis distance from the vertex of the object side of the lens positioned closest to the object side of the optical system to the top plane of the image sensor, and f1 is the focal length of the first lens.)

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