Optical system and camera module

Abstract

An optical system according to an embodiment of the present invention comprises: a first lens having refractive power and a reflective surface that reflects light incident on a first optical axis toward a second optical axis; and second to eleventh lenses disposed between the first lens and an image sensor and sequentially aligned along the second optical axis, wherein the first lens includes a concave object-side surface on the first optical axis and a convex sensor-side surface on the second optical axis, and the third to tenth lenses may move along the second optical axis in groups of two or three lenses according to the operation mode.

Description

Optical system and camera module

[0001] The embodiment 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 to be ultra-compact, allowing them to be applied not only to portable devices such as smartphones, tablet PCs, and laptops, but also to drones and vehicles, providing a variety of functions. 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 to increase or decrease the magnification of distant objects 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 mounting devices or user movements.

[0003] The most important element for a camera module to obtain an image is the imaging lens that forms the image. Recently, interest in high resolution has been increasing, and research on optical systems containing multiple lenses is being conducted to achieve this. For example, research is being conducted using multiple imaging lenses with positive (+) or negative (-) refractive power to achieve high resolution. However, when multiple lenses are included, there is a problem in that it is difficult to derive excellent optical characteristics and aberration characteristics. In addition, when multiple lenses are included, the overall length and height may increase due to the thickness, spacing, and size of the multiple lenses, which leads to a problem in that the overall size of the module containing the multiple lenses increases.

[0004] The size of image sensors is increasing to realize high-resolution and high-quality images. However, when the size of the image sensor increases, the Total Track Length (TTL) of the optical system containing multiple lenses also increases, which leads to the problem of increased thickness in cameras, mobile terminals, and other devices containing the said optical system.

[0005] When the above optical system includes multiple lenses, zoom and autofocus (AF) functions can be performed by controlling the position of at least one lens or a lens group including at least one lens. However, when the lens or the lens group performs the above functions, the amount of movement of the lens or the lens group may increase exponentially. Accordingly, the optical system may require a large amount of energy for the movement of the lens or the lens group, and there is a problem that a large volume is required to account for the amount of movement. In addition, there is a problem that aberration characteristics deteriorate due to the movement of the lens or the lens group. Consequently, there is a problem that optical characteristics deteriorate at a specific magnification when performing zoom or AF functions. Therefore, a new optical system capable of solving the aforementioned problems is required.

[0006] Embodiments of the invention aim to provide an optical system with improved optical characteristics. Embodiments aim to provide an optical system and camera module capable of capturing images at various magnifications. Embodiments aim to provide an optical system and camera module having improved aberration characteristics at various magnifications. Embodiments aim to provide an optical system and camera module capable of realizing stable performance and high-resolution images by utilizing a prism and multiple lenses. Embodiments aim to provide an optical system and camera module that can be implemented in a small and compact manner.

[0007] An optical system according to an embodiment of the invention comprises: a first lens having a reflective surface and refractive power that reflects light incident on a first optical axis toward a second optical axis; and second to eleven lenses disposed between the first lens and an image sensor and sequentially aligned along the second optical axis, wherein the first lens includes an object-side surface concave on the first optical axis and a sensor-side surface convex on the second optical axis, and the third to ten lenses can move along the second optical axis in a group of two or three lenses depending on the operation mode.

[0008] According to an embodiment of the invention, the second lens has a concave object-side surface and a convex sensor-side surface on the second optical axis, and the second lens may have a negative refractive power. The eleventh lens has a convex object-side surface and a convex sensor-side surface on the second optical axis, and the eleventh lens may have a positive refractive power. The first lens and the fifth lens may have a positive refractive power.

[0009] According to an embodiment of the invention, in wide mode, the focal length of the optical system is Md1F, and the total length along the first and second optical axes of the optical system is TTL, satisfying the equation: 0 < Md1F / TTL < 1. It may include an aperture disposed around the perimeter between the sensor side of the fourth lens and the object side of the fifth lens.

[0010] According to an embodiment of the invention, the first and second lenses are a first lens group, the third and fourth lenses are a second lens group, the fifth, sixth, and seventh lenses are a third lens group, the eighth, ninth, and tenth lenses are a fourth lens group, the eleventh lens is a fifth lens group, and the second to fourth lens groups can each be moved along the second optical axis according to the operation mode. The first lens group may have negative refractive power.

[0011] According to an embodiment of the invention, the average effective lengths of the object side surface and the sensor side surface of the second, fourth, and fifth lenses are CA2, CA4, and CA5, and can satisfy the mathematical formula: CA2 < CA4 < CA5.

[0012] The average effective length of the object side and sensor side of the 5th to 8th lenses is CA5 to CA8, and can satisfy the formula: CA8 < CA7 < CA6 < CA5. The average effective length of the object side and sensor side of the 8th to 11th lenses is CA8 to CA11, and can satisfy the formula: CA8 < CA9 < CA10 < CA11.

[0013] A camera module according to an embodiment of the invention comprises an image sensor; and an optical system disposed on the image sensor, wherein the optical system may include the optical system disclosed above.

[0014] The optical system and camera module according to the embodiment have various magnifications and can possess excellent optical characteristics when providing various magnifications. Specifically, the embodiment can have various magnifications by controlling the movement distance of each of the movable lens groups and can provide an autofocus (AF) function for a subject. The optical system and camera module according to the embodiment can correct aberration characteristics of multiple lens groups 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.

[0015] The optical system and camera module according to the embodiment control the effective focal length (EFL) by moving only some of the lens groups among a plurality of lens groups, and can minimize the movement distance of the moving lens groups. Accordingly, the optical system can reduce the movement distance of the lens groups moving according to the change in operating mode and minimize the power consumption required when moving the lens groups. In addition, at least one lens included in the fixed group and the moving group of the optical system may have a non-circular shape. The optical system according to the embodiment of the invention can reduce the thickness of the optical system while maintaining optical performance and reduce the overall length of the optical system by reflecting incident light using a prism. In addition, the camera module of a mobile terminal can be miniaturized.

[0016] The optical system and camera module according to the embodiment can adjust the magnification by moving a lens group other than the first lens group adjacent to the subject among a plurality of lens groups. Accordingly, the optical system can have a constant TTL value even with the movement of the lens group due to changes in magnification. Therefore, the camera module can have a folded zoom optical system and be provided with a slimmer structure.

[0017] FIG. 1 is a configuration diagram showing an example of a first mode (Wide mode) of a camera module and optical system according to a first embodiment of the invention.

[0018] Figure 2 is an unfolded view of the lenses of the camera module and optical system of Figure 1.

[0019] Figures 3 (a) and 3 (b) are examples of the operation of the second mode (Middle mode) and the third mode (Tele mode) of the optical system of Figure 2.

[0020] Figure 4 is a table of lens data of an optical system according to an embodiment of the invention.

[0021] FIG. 5 is a table showing the aspherical coefficients of the lenses of an optical system according to an embodiment of the invention.

[0022] Figures 6 (a), (b), and (c) are graphs showing data of the diffraction MTF (Modulation Transfer Function) according to the first, second, and third modes of the optical system of Figures 2 and 3.

[0023] Figure 7 is a graph showing longitudinal spherical aberration, astigmatic field curves, and distortion aberration in the optical system of the first mode of Figure 2.

[0024] Figure 8 is a graph showing longitudinal spherical aberration, astigmatic field curves, and distortion aberration in the second mode optical system of Figure 3 (a).

[0025] Figure 9 is a graph showing longitudinal spherical aberration, astigmatic field curves, and distortion aberration in the third mode optical system of Figure 3 (b).

[0026] FIG. 10 is a graph showing distortion characteristics from the center (0.0 Field) to the edge (1.0 Field) of the imaging plane of an optical system according to an embodiment of the invention.

[0027] FIG. 11 is a drawing showing an example of a portable device having an optical system and a camera module according to an embodiment of the invention.

[0028] FIG. 12 is a perspective view of a mobile terminal having an optical system and a camera module according to an embodiment of the invention.

[0029] FIG. 13 is a plan view showing an example of a moving body having an optical system and a camera module according to an embodiment of the invention.

[0030] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. However, the technical concept of the present invention is not limited to some of the described embodiments 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 among the embodiments may be selectively combined or substituted. Furthermore, terms used in the embodiments of the present invention (including technical and scientific terms) may be interpreted in a meaning generally understood by those skilled in the art to which the present invention belongs, unless explicitly and specifically defined otherwise. Terms used generally, such as those defined in advance, may be interpreted by considering their meaning in the context of the relevant technology. The terms used in the embodiments of the present invention are intended to describe the embodiments and are not intended to limit the present invention.

[0031] 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. Additionally, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the embodiments of the present invention. These terms are intended only to distinguish the component from other components and are not to limit the essence, order, or sequence of the component. Furthermore, when 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. Where described in the specification 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. Furthermore, 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.

[0032] In the specification, the statement that the lens surface is convex may mean that the lens surface in the region corresponding to the optical axis or the paraxial region has a convex shape with respect to the optical axis, and the statement that the lens surface is concave may mean that the lens surface in the region corresponding to the optical axis or the paraxial region has a concave shape. Additionally, "object side surface" may mean the lens surface facing the object side with respect to the optical axis, and "sensor side surface" may mean the lens surface facing the imaging plane (image sensor) with respect to the optical axis. Additionally, the center thickness of the lens may mean the thickness of the lens in the optical axis direction from the optical axis. Additionally, the vertical direction may mean the direction perpendicular to the optical axis, and the end of the lens or lens surface may mean the end of the effective region of the lens through which incident light passes. Additionally, 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. In the following, the units of length, thickness, spacing, radius of curvature, distance, etc. are mm.

[0033]

[0034] As shown in FIGS. 1 and 2, an optical system (100) according to an embodiment of the invention may include a plurality of lens groups. The plurality of lens groups may include at least four lens groups. Each of the plurality of lens groups includes at least one lens, and any one of the plurality of lens groups may have a lens having a reflective surface. The plurality of lens groups includes first to fifth lens groups (LG1-LG5). In the invention, the incident side of the lens having a reflective surface is aligned with a first optical axis (OA1), and the lenses placed between the lens having the reflective surface and the image sensor (190) may be aligned with a second optical axis (OA2). The first optical axis (OA1) and the optical axis (OA2) are orthogonal to each other, and the first and second optical axes (OA1, OA2) may be defined as optical axes.

[0035] The optical system (100) may include first to fifth lens groups (LG1-LG5) arranged sequentially along optical axes (OA1, 0A2) from an object toward an image sensor (190). For example, the first lens group (LG1) changes the optical path from the first optical axis (OA1) to the optical axis (OA2), and the second to fifth lens groups (LG2-LG5) may be aligned to the second optical axis (OA2). The first optical axis (OA1) is an axis passing through the center of the incident side surface (S1) of the lens having the reflective surface, and the second optical axis (OA2) is the optical axis of the lenses arranged between the center of the exit side surface (S2) of the lens having the reflective surface and the image sensor (190). Here, the second optical axis (OA2) is an axis passing through the center of the lenses of the second to fifth lens groups (LG2-LG5) and the center of the image sensor (190).

[0036] The second lens group (LG2) is positioned between the first lens group (LG1) and the third lens group (LG3), the third lens group (LG3) is positioned between the second lens group (LG2) and the fourth lens group (LG4), and the fourth lens group (LG4) can be positioned between the third lens group (LG3) and the fifth lens group (LG5). The first lens group (LG1) changes the path of light rays, the second lens group (LG2) and the third lens group (LG3) are elements that change the zoom magnification, i.e., the focal length, of the optical system, the fourth lens group (LG4) is an element that adjusts the focal position of the imaging surface, and the fifth lens group (LG5) can refract the incident light toward the imaging surface. The above-mentioned fourth lens group (LG4) can perform the role of controlling the Chief Ray Angle (CRA).

[0037]

[0038] The optical system (100) may include n lenses, the nth lens may be the last lens, and the (n-1)th lens may be the lens closest to the last lens. n is an integer greater than or equal to 9, for example, 9 to 12 or 10 to 12. Within the optical system (100), the lenses may be defined as lens parts. Among the plurality of lens groups, at least two lens groups may be fixed lens groups with fixed positions, and at least two lens groups may be variable lens groups with variable positions. For example, the first lens group (LG1) adjacent to the object and the last fifth lens group (LG5) may be fixed lens groups, and the lens groups positioned between the first lens group (LG1) and the fifth lens group (LG5) may be variable lens groups. Here, the variable lens groups may be moved in the direction of the optical axis (OA2) or returned to their original positions. By means of the above variable lens group, the optical system (100) can provide a continuous zoom optical system having a wide mode, a middle mode, and a tele mode. Additionally, the first lens group (LG1) is equipped with a first lens (111) having a reflective surface, and since the first lens (111) converts the path of the incident light at a right angle, a folded zoom optical system can be provided. The moving distance of the moving lens groups can be set to a maximum of 11 mm or less to reduce the power consumption of the driving member. Also, in the telescopic mode, the optical axis spacing (CG7) between the third and fourth lens groups (LG3, LG4) can be set to 2 mm or more, for example, exceeding 2 mm, thereby reducing the moving distance of the fourth lens group (LG4) and providing a high-magnification optical system.

[0039]

[0040] The number of lenses in each of the first lens group (LG1) and the second lens group (LG2) may be equal to each other. The number of lenses in the first lens group (LG1) includes a lens having a reflective surface (RS0). The lens (111) having the reflective surface (RS0) may be a prism. That is, the lens (111) having the reflective surface (RS0) or the prism may have power.

[0041] The number of lenses in each of the first lens group (LG1) and the second lens group (LG2) may be three or fewer, for example, two. The number of lenses in each of the second lens group (LG2) and the third lens group (LG3) may differ from one another. For example, the number of lenses in the third lens group (LG3) may be greater than the number of lenses in the second lens group (LG2), for example, three. The number of lenses in the fourth lens group (LG4) may be equal to the number of lenses in each of the third lens group (LG3). The number of lenses in each of the third lens group (LG3) and the fourth lens group (LG4) may be four or fewer, for example, three. The number of lenses in the fifth lens group (LG5) may be smaller than the number of lenses in at least one or both of the first and second lens groups (LG1, LG2). The number of lenses in the above-mentioned fifth lens group (LG5) may be two or fewer, for example, one. By stacking these lenses, an optical system of wide mode, middle mode, and tele mode can be provided, and a bright optical system with an F-number in the range of 2.0 to 4.0 can also be provided depending on the operating mode.

[0042] When in zoom magnification or focusing mode, the maximum travel distance of at least one of the second and third lens groups (LG2, LG3) may be 11 mm or less, and may be in the range of 4 mm to 11 mm or in the range of 5 mm to 10 mm. If the maximum travel distance of the second and third lens groups (LG2, LG3) is greater than the above range, the length of the camera module becomes longer, and it may be difficult to secure optical performance. Also, if it is smaller than the above range, the zoom magnification may be reduced. When in zoom magnification or focusing mode, the maximum travel distance of the fourth lens group (LG4) may be 10 mm or less, and may be in the range of 4 mm to 10 mm or in the range of 5 mm to 9 mm. If the maximum travel distance of the fourth lens group (LG4) is greater than the above range, the length of the camera module becomes longer, and it may be difficult to secure optical performance. Also, if it is smaller than the above range, the zoom magnification may be reduced.

[0043]

[0044] At least one or all of the lenses of the first lens group (LG1) may be made of plastic. As another example, the lens closest to the object among the lenses may be made of glass. At least one of the lenses of the first lens group (LG1) may have a refractive index of 1.6 or higher. For example, the first lens (111) closest to the object may have a refractive index of 1.6 or higher and be made of plastic. The lenses of the first lens group (LG1) are aspherical lenses. If all of the lenses of this first lens group (LG1) are made of plastic, spherical aberration can be corrected and chromatic dispersion can be reduced. In the specification, the refractive index is the refractive index at the d-line (e.g., 5867.6 nm).

[0045] At least one or all of the lenses of the second lens group (LG2) may be made of plastic, for example, plastic. The lenses of the second lens group (LG2) are aspherical lenses. At least one or all of the lenses of the third and fourth lens groups (LG3, LG4) may be made of plastic, for example, plastic. Additionally, the lenses within the moving lens groups (LG2, LG3, LG4) may be made of plastic to prevent an increase in the power consumption of the driving member. As another example, each of the moving lens groups (LG2, LG3, LG4) may include a plastic lens and a glass lens. The last lens in the fifth lens group (LG5) closest to the image sensor (190) may be made of plastic. The fixed-position lens(s) positioned between the image sensor (190) and the moving lens groups (LG2, LG3, LG4) may be made of plastic. As another example, the last lens may be an aspherical lens made of plastic or glass. At least one or all of the lens surfaces of the lenses of the second to fourth lens groups (LG2-LG4) may have an aspherical shape on the optical axis, thereby reducing distortion in the periphery of the captured image. The lenses having the aspherical shape can prevent spherical aberration within the optical system (100), and since no aberration occurs even when the effective diameter is increased, it is possible to miniaturize and lighten the camera module. The aspherical lens may be made of a glass mold or plastic material.

[0046] The object-side surface of the first lens group (LG1) is the first surface (S1), and the first surface (S1) may have a concave shape on the optical axis (OA). That is, the radius of curvature of the first surface (S1) may have a negative value on the first optical axis (OA1). Since the radius of curvature of the first surface (S1) has a negative value, the effective length of the second surface (S2) can be reduced. The object-side surface of the second lens group (LG2) is the fifth surface (S5), and the fifth surface (S5) may have a concave shape on the second optical axis (OA2). The object-side surface of the third lens group (LG3) is the ninth surface (S9), and the ninth surface (S9) may have a convex shape toward the object on the second optical axis (OA2). The object-side surface of the third lens group (LG4) is the 15th surface (S15), and the 15th surface (S9) may have a convex shape toward the object on the second optical axis (OA2). The object-side surface of the fifth lens group (LG5) is the 21st surface (S21), and the 21st surface (S21) may have a convex shape toward the object on the second optical axis (OA2).

[0047]

[0048] The power of the first lens group (LG1) may have the same sign as the power of the second lens group (LG2). The power of the first and second lens groups (LG1, LG2) may have a negative value. The power of the third lens group (LG3) may have the opposite sign to the power of the first lens group (LG1), for example, may have a positive value. The power of the fourth lens group (LG4) may have the same sign as the power of the first lens group (LG1), for example, may have a negative value. The power of the fifth lens group (LG5) may have the opposite sign to the power of the first lens group (LG1), for example, may have a positive value. Within the optical system (100), the number of lens groups having negative power may be greater than the number of lens groups having positive power.

[0049] Among the lenses in the optical system (100), the number of lenses having negative power may be smaller than the number of lenses having positive power. As another example, among the lenses in the optical system (100), the number of lenses having negative power may be larger than the number of lenses having positive power. When each of the second, third, and fourth lens groups (LG2, LG3, LG4) has two or more lenses, the second, third, and fourth lens groups (LG2, LG3, LG4) may include lenses having negative power and lenses having positive power. Accordingly, the lens optical system can correct optical aberrations and improve image quality by mixing lenses having positive power and lenses having negative power. The power is the reciprocal of the focal length value.

[0050]

[0051] The absolute value of the focal length of each of the first to fifth lens groups (LG1-LG5) may be 70 mm or less, for example, in the range of 1 mm to 70 mm. The focal length of each of the first to fifth lens groups (LG1-LG5) may be defined as FLG1, FLG2, FLG3, FLG4, FLG5, and may satisfy the following conditions.

[0052] Condition 1: |FLG2| < |FLG1| < 70 mm Condition 2: FLG3,FLG5 < |FLG2|

[0053] Condition 3: |FLG4| < |FLG2| Condition 4: FLG5*2 < |FLG1| < FLG5*10

[0054] Condition 5: 1mm < Aver(|FLG3:FLG5|) < 15mm

[0055] Here, Aver(|FLG3:FLG5|) is the average of the absolute values ​​of the focal lengths of the third lens group (LG3) to the fifth lens group (LG5). In the specification, * represents multiplication. Accordingly, the optical system (100) can adjust the angle of view by the focal lengths and, for example, provide an angle of view of less than 45 degrees. The first lens group (LG1) performs an OIS function and can suppress the degradation of resolution by the focal length.

[0056]

[0057] The effective length of the object-side surface (S1) of the first lens group (LG1) may be the largest among the lens surfaces of the lenses of the optical system (100). The effective length of the first surface (S1) may be at least 1.5 times the diagonal length of the image sensor (190), for example, in the range of 1.5 to 2.5 times. Accordingly, the amount of light incident through the first lens (111) can be improved.

[0058] The first surface (S1) on the object side of the first lens (111) is the incident side surface, and the second surface (S2) on the sensor side is the exit side surface. Light incident on the first surface (S1) on the incident side of the first lens (111) is reflected through the reflective surface (RS0) and passes through the second surface (S2) on the exit side. The reflective surface (RS0) may be inclined in a range of 30 to 60 degrees or 45 degrees with respect to the first optical axis (OA2). Within the first to fifth lens groups (LG1-LG5), the number of lenses with a refractive index of 1.6 or higher may be greater than the number of lenses with a refractive index of less than 1.6. Among the lenses of the second to fifth lens groups (LG2-LG5), the lens with the largest center thickness may be placed within the third lens group (LG3). Thus, changes in the light path caused by the moving lenses of the third lens group (LG3) can be reduced.

[0059] If the sum of the refractive indices of the lenses in the above optical system (100) is ΣNd and the sum of the Abbe numbers is ΣVd, the following conditions can be satisfied.

[0060] Condition 1: 15 < ΣNd < 20 Condition 2: 330 < ΣVd < 400

[0061] Aberrations can be controlled by adjusting the refractive index and Abbe number of the lenses in the optical system (100). Chromatic dispersion can be reduced by the lens having the maximum Abbe number, and the chromatic dispersion of the incident light can be increased by the lens having a refractive index of 1.6 or higher.

[0062]

[0063] Each of the lenses of the optical system (100) may include an effective region and an ineffective region. The effective region may be a region through which light incident on each of the lenses passes. That is, the effective region may be defined as an effective region or CA (Clear aperture) where the incident light is refracted to realize optical characteristics. The ineffective region may be placed around the periphery of the effective region. The ineffective region may be a region where effective light is not incident from the plurality of lenses. That is, the ineffective region may be a region unrelated to the optical characteristics. Additionally, the edge of the ineffective region may be a region fixed to a lens barrel (not shown), etc., that accommodates the lens.

[0064] The surface adjacent to the object side of each lens can be defined as the object side surface, and the surface adjacent to the sensor side can be defined as the sensor side surface. The average effective length of the lens can be provided in the range of 4 mm to 7 mm, for example, 7 mm or less. Here, the average effective length may be the average of the effective lengths of the object side surface and the sensor side surface of each lens, or the average of the maximum effective lengths. Within the first lens group (LG1), the maximum effective length of the object side surface (S1) of the first lens (111) can be provided to be greater than the maximum effective length of the sensor side surface (S22) of the last lens (121). Accordingly, the amount of light incident through the first lens (111) can be increased.

[0065]

[0066] At least one or two of the lenses in the second to fifth lens groups (LG2-LG5) may have different effective lengths in two directions orthogonal to the second optical axis (OA2). For example, the last lens (121) may have the same or different effective lengths in the second direction (Y) and the third direction (Z) that are orthogonal to each other. Here, the shape of the object-side or sensor-side of the lens having different effective lengths in two orthogonal directions may be non-circular.

[0067] In the optical system (100), the Total top length (TTL) may be greater than 5 times ImgH, preferably satisfying the conditions 5 < TTL / ImgH < 20 or 8 < TTL / ImgH < 15. The Total track length (TTL) is the distance along the optical axis (OA) from the center of the object-side surface (S1) of the first lens (111) to the surface of the image sensor (190). The TTL is the sum of the distance (TL2) in the direction of the first optical axis (OA1) from the center of the object-side surface (S1) of the first lens (111) to the reflective surface (RS0) and the distance (TL1) in the direction of the second optical axis (OA2) from the reflective surface (RSO) to the surface of the image sensor (190). ImgH is the length from the center of the image sensor (190) to the diagonal end, or half the diagonal length of the image sensor (190). Here, ImgH, TTL, TL1, and TL2 may satisfy the following conditions.

[0068] Condition 1: TL2 < TL1 Condition 2: 0.6 < TL1 / TTL < 0.9

[0069] Condition 3: 4mm < TL2 < 7mm

[0070] In the optical system (100), the effective focal length (EFL) is provided to be greater than 6 mm and the diagonal field of view (FOV) is provided to be less than 45 degrees, thereby providing a folded zoom optical system for a mobile terminal. Accordingly, the optical system (100) can provide a high-resolution and high-magnification zoom optical system. The total length (ZL1) of the third direction (Z) of the optical system (100) is the maximum length, which is the length in the optical axis direction from one end of the first lens (111) or one end of the prism to the image sensor (190).

[0071]

[0072] The number of lenses having an effective length greater than the maximum effective length of the image sensor (190) within the optical system (100) is less than 40%, for example, in the range of 10% to 40%. The effective length is the average of the effective lengths of the object-side and sensor-side of each lens. The effective length of the lens (e.g., 114) placed on the object-side of the aperture (ST) may be smaller than the diagonal length of the image sensor (190). The effective length of the lens (e.g., 115) placed on the sensor-side of the aperture (ST) may be larger than the diagonal length of the image sensor (190). Accordingly, the brightness of the optical system can be controlled. By controlling the effective diameter of each lens, the optical system (100) can control the incident light to compensate for the degradation of optical characteristics due to resolution and temperature changes, and can improve chromatic aberration control characteristics. Here, the effective length of each lens is the average of the effective lengths in two different directions.

[0073]

[0074] The center spacing between adjacent lens groups may be the center spacing between adjacent lenses. That is, the center spacing between the first lens group (LG1) and the second lens group (LG2) can be defined as CG2, the center spacing between the second lens group (LG2) and the third lens group (LG3) can be defined as CG4, the center spacing between the third lens group (LG3) and the fourth lens group (LG4) can be defined as CG7, and the center spacing between the fourth lens group (LG4) and the fifth lens group (LG5) can be defined as CG10. The second to fourth lens groups (LG1, LG3, LG4) move along the second optical axis (OA2) according to the operation mode, and the center spacings (CG2, CG4, CG7, CG10) can be varied according to the operation mode.

[0075] The maximum center gap (CG2) between the first lens group (LG1) and the second lens group (LG2) may be smaller than the maximum center gap (CG4) between the second and third lens groups (LG2, LG3) and larger than the minimum gap. The center gap (CG7) between the third lens group (LG3) and the fourth lens group (LG4) may be larger than the maximum gap between the first and second lens groups (LG1, LG2). The maximum center gap (CG10) between the fourth lens group (LG5) and the fifth lens group (LG5) may be larger than the maximum center gap between the first and second lens groups (LG1, LG2) and larger than the maximum center gap between the third and fourth lens groups (LG3, LG4). The minimum center gap (CG10) between the fourth lens group (LG5) and the fifth lens group (LG5) may be smaller than the minimum center gap between the first and second lens groups (LG1,LG2) and smaller than the minimum center gap between the third and fourth lens groups (LG3,LG4).

[0076]

[0077] The optical system (100) or camera module may include an image sensor (190). The image sensor (190) may detect light and convert it into an electrical signal. The image sensor (190) may detect light that has passed through the lens group (LG1-LG5) sequentially. The image sensor (190) may include a device capable of detecting incident light, such as a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS). The optical system (100) or camera module may include an optical filter (192). The optical filter (500) may be placed between the fifth lens group (LG5) and the image sensor (190). The optical filter (500) may be placed between the lens closest to the sensor side among the lenses and the image sensor (190). For example, the optical system may be placed between the last lens and the image sensor (190). A cover glass (not shown) is placed between the optical filter (500) and the image sensor (190), protects the upper part of the image sensor (190), and can prevent a decrease in the reliability of the image sensor (190). The cover glass can be removed.

[0078] The optical filter (500) may include an infrared filter or an infrared cut-off filter (IR cut-off). The optical filter (500) may pass light of a set wavelength band and filter light of a different wavelength band. If the optical filter (500) includes an infrared filter, it may block radiant heat emitted from external light from being transmitted to the image sensor (190). Additionally, the optical filter (500) may transmit visible light and reflect infrared light.

[0079] The optical system (100) according to the embodiment may include an aperture (ST). The aperture (ST) may control the amount of light incident on the optical system (100). The aperture (ST) may be positioned around the perimeter between any two lenses within the lens. The aperture (ST) may be positioned around the perimeter between the second lens group (LG2) and the third lens group (LG3). The aperture (ST) may be positioned around the perimeter of the object-side surface (S9) of the third lens group (LG3). As another example, the aperture (ST) may be positioned around the perimeter of the sensor-side surface of the second lens group (LG2). The portion coated on the non-effective surface area of ​​at least one lens among the lenses of the third lens group (LG3) may perform the function of the aperture (ST). Specifically, the object side or sensor side of the fourth lens (114) or the fifth lens (115) among the lenses of the optical system (100) can function as an aperture to control the amount of light. The optical axis distance between the aperture (ST) and the image sensor (190) is SD, and the value of SD may vary depending on the operating mode, such as wide mode, middle mode, or tele mode. Since the third lens group (LG3) is moved, the optical axis distance between the third lens group (LG3) and the image sensor (190) may vary depending on the operating mode, such as wide mode, middle mode, or tele mode. The optical axis distance between the fifth lens group (LG5) and the image sensor (190) is BFL and may be a fixed value.

[0080]

[0081] The camera module can control the movement of the prism (110) by means of a control signal. Specifically, if shaking occurs in the camera module, information regarding the degree of rotation and position change of the Hall sensors can be detected, and correction for the shaking can be performed. In addition, the camera module can control the movement of the moving lens group by means of a driving signal, detect position changes, and vary the focal length. Accordingly, when shooting a subject located at infinity or near distance using the camera module, shaking caused by rotation and position change can be effectively corrected. The camera module according to the embodiment can effectively correct shaking caused by rotation and shaking caused by position change when shooting a subject located at infinity or near distance. Therefore, the camera module can have improved optical characteristics.

[0082] Hereinafter, embodiments will be described with reference to the drawings. Hereinafter, the description will be made using an optical system and a camera module. For convenience of explanation, the lens closest to the object is the first lens (111), and may include second to eleven lenses (112-121) sequentially stacked on the sensor side of the first lens (111). The center thickness of the first to eleven lenses (111-121) can be defined as CT1 to CT11, the edge thickness of the first to eleven lenses (111-121) can be defined as ET1 to ET11, and the focal length of the first to eleven lenses (111-121) can be defined as F1 to F11. The refractive index of the first to eleven lenses (111-121) can be defined as Nd1 to Nd11. The Abbe numbers of the first to eleventh lenses (111-121) can be defined as Ad1 to Ad11. Additionally, the center distance between two adjacent lenses can be defined as CG1 to CG10. For example, the center distance between the first and second lenses (111, 112) is CG1, the center distance between adjacent second and third lenses (112, 113) is CG2, the center distance between the third and fourth lenses (113, 114) is CG3, and other center distances (CG4-CG10) can be defined in the same way. The optical axis distance between the eleventh lens (121) and the image sensor can be defined as BFL (Back focal length). The optical axis distance (BFL) between the eleventh lens (121) and the image sensor (190) can provide a space for the optical filter (192) to be installed.

[0083] Additionally, the effective lengths of the object side and sensor side of the first lens (111) can be defined as CAS1 and CAS2, the effective lengths of the object side and sensor side of the second lens (112) can be defined as CAS3 and CAS4, the effective lengths of the object side and sensor side of the third lens (113) can be defined as CAS5 and CAS6, and the effective lengths of the object side and sensor side of the fourth to eleventh lenses can be defined as CAS7, CAS8, CAS9, CAS10, CAS11, CAS12, CAS13, CAS14, CAS15, CAS16, CAS17, CAS18, CAS19, CAS20, and CAS21 and CAS22. Here, the average of the effective lengths of the object side and sensor side of the first to eleventh lenses can be defined as CA1-CA11.

[0084] Referring to FIGS. 1 to 5, an optical system (100) according to an embodiment includes first to fifth lens groups (LG1-LG5). Second to fourth lens groups (LG2-LG4) positioned between an object and the fifth lens group (LG5) have positions that vary according to the operating mode, while the first lens group (LG1) and the fifth lens group (LG5) have fixed positions. The operating mode includes a first mode which is a wide mode, a second mode which is a middle mode, and a third mode which is a tele mode, depending on the effective focal length. The first lens group (LG1) refracts incident light and reflects it toward the second lens group (LG2), the second to fourth lens groups (LG2-LG4) refract incident light and move along the second optical axis (OA2) to change the zoom magnification (focal length), and the fifth lens group (LG5) can refract the light to be focused onto the upper surface of the image sensor (190). The first lens group (LG1) includes a first lens (111) and a second lens (112). The second lens group (LG2) includes a third lens and a fourth lens (113, 114). The third lens group (LG3) includes fifth to seventh lenses (115, 116, 117). The fourth lens group (LG4) includes eighth to tenth lenses (118, 119, 120). The above 5th lens group (LG5) includes the 11th lens (121).

[0085] The first to eleventh lenses (111-121) may have refractive power. The first and second lenses (111, 112) may correct aberrations by having refractive powers of opposite signs (+, -), and the third and fourth lenses (113, 114) may correct aberrations by having refractive powers of opposite signs (+, -). The tenth and eleventh lenses (110, 121) may correct aberrations by having refractive powers of opposite signs (+, -). In the lens data of FIG. 5, each of the lenses is defined as Lens 1-Lens 11, and the object side (or incident side) and sensor side (or exit side) of the lenses and filters may be represented as S1 and S2.

[0086] The first lens (111) has an incident side first surface (S1), an exit side second surface (S2), and a reflective surface (RS0), and light incident on the incident side surface (S1) is reflected to the exit side surface (S2) by the reflective surface (RS0). The first lens (111) may have a positive (+) or negative (-) refractive power on the first optical axis (OA1), for example, it may have a positive refractive power. The first lens (111) may include a plastic or glass material, for example, it may be a plastic material. On the first optical axis (OA1), the first surface (S1) may have a concave shape, and on the second optical axis (OA2), the second surface (S2) may have a convex shape. Alternatively, the first surface (S1) may have a convex shape, and the second surface (S2) may have a concave shape. Alternatively, the first surface (S1) may have a convex shape, and the second surface (S2) may have a convex shape. The refractive index of the first lens (111) may be higher than the refractive index of the second lens (112), for example, 1.60 or higher. The first lens (111) may have a prism shape. As another example, the first lens (111) may have a concave lens attached to the object-side surface of the prism and a convex lens attached to the exit-side surface.

[0087] The effective length of the first surface (S1) of the first lens (111) may be the longest among the lenses. That is, the effective length of the first surface (S1) of the first lens (111) in the third direction (Z) may be the longest among the lenses. Accordingly, the first lens (111) can improve light aberration or control incident light rays. Since the sensor-side second surface (S2) of the first lens (111) is provided in a convex shape, the center gap (CG1) between the first and second lenses (111, 112) can be reduced, and light can be transmitted to the entire area of ​​the third lens (113) whose position is variable. Here, the length of the second surface (S2) of the first lens (111) in the second direction (Y) may be greater than the effective length of the object-side surface and the sensor-side surface of the second lens (112), and smaller than the effective length of the first surface (S1). At least one or both of the first surface (S1) and the second surface (S2) of the first lens (111) may be aspherical. The aspherical coefficients and conic constants (K) of the 4th to 10th order (AD) of the first and second surfaces (S1, S2) can be represented as L1S1 and L1S2 of FIG. 5.

[0088]

[0089] The second lens (112) may have a positive (+) or negative (-) refractive power on the optical axis (OA2), for example, it may have a negative refractive power. The second lens (112) may include a plastic or glass material, for example, it may be a plastic material. The second lens (112) may include a third surface (S3) on the object side and a fourth surface (S4) on the sensor side, and on the second optical axis (OA2), the third surface (S3) may have a concave shape and the fourth surface (S4) may have a convex shape. Alternatively, the third surface (S3) may have a convex shape and the fourth surface (S4) may have a concave shape. The length (Y) of the second direction of the third surface (S3) of the second lens (112) may be equal to or smaller than the length of the second direction (Y) of the second surface (S2) of the first lens (111), for example, it may be in the range of 90% to 99% of the effective length of the second surface (S2) of the first lens (111).

[0090] At least one or all of the third surface (S3) and the fourth surface (S4) of the second lens (112) may be aspherical. The aspherical coefficients and conic constants (K) of the 4th to 10th order (AD) of the third and fourth surfaces (S3, S4) can be represented as L2S3 and L2S4 of FIG. 5.

[0091]

[0092] The third lens (113) may have a negative refractive power. The refractive power of the third lens (113) may have the same sign as the refractive power of the second lens (112) on the second optical axis (OA2). The third lens (113) may include a plastic or glass material, for example, a plastic material. The third lens (113) may include a fifth surface (S5) on the object side and a sixth surface (S6) on the sensor side. On the optical axis (OA2), the fifth surface (S5) may have a concave shape, and the sixth surface (S6) may have a concave shape. The third lens (113) may have a concave shape on both sides. Alternatively, the fifth surface (S5) may have a convex shape, and the sixth surface (S6) may have a concave shape. Alternatively, the fifth surface (S5) may have a convex shape, and the sixth surface (S6) may have a convex shape. At least one or all of the fifth surface (S5) and the sixth surface (S6) of the third lens (113) may be aspherical. The aspherical coefficients and conic constants (K) of the 4th to 10th order (AD) of the fifth and sixth surfaces (S5, S6) can be represented as L3S5 and L3S6 of FIG. 4.

[0093]

[0094] The fourth lens (114) may have a positive (+) refractive power on the second optical axis (OA2). The fourth lens (114) may be made of plastic or glass material, for example, plastic material, and may have a refractive index of 1.60 or higher. The fourth lens (114) includes a seventh surface (S7) on the object side and an eighth surface (S8) on the sensor side, and on the second optical axis (OA2), the seventh surface (S7) may have a convex shape and the eighth surface (S8) may have a concave shape. That is, the fourth lens (114) may have a meniscus shape that is convex toward the object or the first lens (111) on the second optical axis (OA2). Alternatively, the seventh surface (S7) may be concave on the second optical axis (OA2), and the eighth surface (S8) may be concave on the second optical axis (OA2). Alternatively, the fourth lens may have a meniscus shape that is convex toward the sensor. Here, the expression facing the object may be represented as the expression facing the first lens (111) closest to the object. At least one or all of the seventh surface (S7) and the eighth surface (S8) of the fourth lens (114) may be aspherical. The conic constants of the seventh and eighth surfaces (S7, S8) and the aspherical coefficients from the fourth to the tenth order (AD) may be represented as L4S7 and L4S8 in FIG. 5.

[0095]

[0096] The fifth lens (115) may have a positive (+) or negative (-) refractive power on the optical axis (OA2). The fifth lens (115) may have a positive refractive power. The fifth lens (115) may have power with the same sign as the power sign of the fourth lens (114) on the second optical axis (OA2). The fifth lens (115) may include plastic or glass material, for example, it may be plastic material. The fifth lens (115) may include an object-side ninth surface (S9) and a sensor-side tenth surface (S10). On the optical axis (OA2), the ninth surface (S9) may have a convex shape, and the tenth surface (S10) may have a convex shape. That is, the fifth lens (115) may have a convex shape on both sides on the second optical axis (OA2). Alternatively, the fifth lens (115) may have a concave shape on both sides or a meniscus shape that is convex toward an object or sensor. At least one or both of the ninth surface (S9) and the tenth surface (S10) of the fifth lens (115) may be aspherical. The conic constant and aspherical coefficient of the ninth and tenth surfaces (S9, S10) can be represented as L5S9 and L5S10 in FIG. 5.

[0097] The center thickness (CT4) of the fourth lens (114) may be thinner than the edge thickness (ET4). The center thickness (CT5) of the fifth lens (115) may be thicker than the edge thickness (ET5). Accordingly, due to the shape and radius of curvature of the concave eighth surface (S8) of the fourth lens (114) and the convex ninth surface (S9) of the fifth lens (115), the center gap (CG4) between the eighth and ninth surfaces (S8, S9) may be reduced compared to the edge gap.

[0098]

[0099] The sixth lens (116) may have a positive (+) or negative (-) refractive power on the second optical axis (OA2), for example, it may have a positive refractive power. The sixth lens (116) may include a plastic or glass material, for example, it may be a plastic material. The sixth lens (116) may include an object-side eleventh surface (S11) and a sensor-side twelfth surface (S12). On the second optical axis (OA2), the eleventh surface (S11) may have a convex shape, and the twelfth surface (S12) may have a concave shape. That is, the sixth lens (116) may have a convex shape on both sides on the second optical axis (OA2). Alternatively, the eleventh surface (S11) may have a convex shape, and the twelfth surface (S12) may have a concave shape. Alternatively, the 11th surface (S11) may have a concave shape, and the 12th surface (S12) may have a convex shape. Alternatively, the 11th and 12th surfaces (S11, S12) may have a concave shape. At least one or all of the 11th surface (S11) and the 12th surface (S12) of the 6th lens (116) may be aspherical. The aspherical coefficients and conic constants (K) from the 4th to 10th order (AD) of the 11th and 12th surfaces (S11, S12) can be represented as L6S11 and L6S12 of FIG. 5.

[0100]

[0101] The seventh lens (117) may have a positive (+) or negative (-) refractive power on the second optical axis (OA2), and may have a negative refractive power. The refractive power of the seventh lens (117) has a sign opposite to the sign of the refractive power of the sixth lens (116), so that chromatic aberration can be improved. The seventh lens (117) may include a plastic or glass material, for example, a plastic material. The seventh lens (117) may include a 13th surface (S13) on the object side and a 14th surface (S14) on the sensor side. On the second optical axis (OA2), the 13th surface (S13) may have a concave shape, and the 14th surface (S14) may have a convex shape. That is, the seventh lens (117) may have a meniscus shape that is convex toward the sensor on the second optical axis (OA2). As another example, the 13th surface (S13) may have a convex shape and the 14th surface (S14) may have a concave shape. Alternatively, the 13th surface (S13) may have a convex shape and the 14th surface (S14) may have a convex shape. Alternatively, the 13th surface (S13) may have a concave shape and the 14th surface (S14) may have a concave shape. At least one or all of the 13th surface (S13) and the 14th surface (S12) of the 7th lens (117) may be aspherical. The aspherical coefficients (AD) and conic constants (K) from the 4th to the 10th order of the 13th and 14th surfaces (S13, S14) can be represented as L7S13 and L7S14 in FIG. 5.

[0102]

[0103] The center thickness (CT5) of the fifth lens (115) may be thinner than the center thickness (CT6) of the sixth lens (116). The center thickness (CT6) of the sixth lens (116) may be thicker than the center thickness of the second-fourth lenses (112-114) and the seventh to tenth lenses (117, 120). The Abbe number (Ad5) of the fifth lens (114) may be greater than the Abbe number of the first to third lenses (111-113). The difference in Abbe numbers between the first lens (111) and the fifth lens (115) may be greater than 20. Accordingly, the third lens group (LG3) can minimize changes in chromatic aberration caused by positions that change according to changes in the operating mode. The Abbe number (Ad6) of the sixth lens (116) may be greater than 20 than the Abbe number (Ad4) of the fourth lens (114). The Abbe number (Ad6) of the sixth lens (116) may be greater than 20 than the Abbe number (Ad7) of the seventh lens (117). The sixth lens (116) and the seventh lens (117) have refractive powers of opposite signs, and chromatic aberration can be controlled when the difference in Abbe numbers is set to be greater than 20. Accordingly, the third lens group (LG3) can perform an achromatic function while minimizing changes in chromatic aberration caused by the position changing according to the mode change.

[0104]

[0105] The eighth lens (118) may have a positive or negative refractive power on the second optical axis (OA2), for example, it may have a negative refractive power. The eighth lens (118) may include a plastic or glass material, for example, it may be a plastic material. The eighth lens (118) may include a 15th surface (S15) on the object side and a 16th surface (S16) on the sensor side. On the second optical axis (OA2), the 15th surface (S15) may have a convex shape, and the 16th surface (S16) may have a concave shape. That is, the eighth lens (118) may have a meniscus shape that is convex toward the object or the first lens (111). Alternatively, the 15th surface (S15) may have a concave shape, and the 16th surface (S16) may have a convex shape. Alternatively, the 15th surface (S15) may have a convex shape, and the 16th surface (S16) may have a convex shape. At least one or all of the 15th surface (S15) and the 16th surface (S16) of the 8th lens (118) may be aspherical. The aspherical coefficients (AI) and conic constants (K) of the 4th to 10th order of the 15th and 16th surfaces (S15, S16) can be represented as L8S15 and L8S16 of FIG. 5.

[0106]

[0107] The ninth lens (119) may have a positive or negative refractive power on the second optical axis (OA2), for example, it may have a positive refractive power. The ninth lens (119) may include a plastic or glass material, for example, it may be a plastic material. The ninth lens (119) may include an object-side 17th surface (S17) and a sensor-side 18th surface (S18). On the second optical axis (OA2), the 17th surface (S17) may have a convex shape, and the 18th surface (S18) may have a convex shape. That is, the ninth lens (119) may have a convex shape on both sides. Alternatively, the 17th surface (S17) may have a concave shape, and the 18th surface (S18) may have a convex shape. Alternatively, the 17th surface (S17) may have a convex shape, and the 18th surface (S18) may have a convex shape. At least one or all of the 17th surface (S17) and the 18th surface (S18) of the 9th lens (119) may be aspherical. The aspherical coefficients (AI) and conic constants (K) of the 4th to 10th order of the 17th and 18th surfaces (S17, S18) can be represented as L9S17 and L9S18 of FIG. 5.

[0108] The above 10th lens (120) may have a positive or negative refractive power on the second optical axis (OA2), for example, it may have a negative refractive power. The above 10th lens (120) may include a plastic or glass material, for example, it may be a plastic material. The above 10th lens (120) may include an object-side 19th surface (S19) and a sensor-side 20th surface (S20). On the second optical axis (OA2), the 19th surface (S19) may have a concave shape, and the 20th surface (S20) may have a concave shape. That is, the above 10th lens (120) may have a concave shape on both sides. Alternatively, the 19th surface (S19) may have a concave shape, and the 20th surface (S20) may have a convex shape. Alternatively, the 19th surface (S19) may have a convex shape, and the 20th surface (S20) may have a convex shape. At least one or all of the 19th surface (S19) and the 20th surface (S20) of the 10th lens (120) may be aspherical. The aspherical coefficients (AI) and conic constants (K) of the 4th to 10th order of the 19th and 20th surfaces (S19, S20) can be represented as L10S19 and L10S20 of FIG. 5.

[0109] At least one or both of the 19th surface (S19) and the 20th surface (S20) of the 10th lens (120) may have a critical point. Since the 19th surface (S19) and the 20th surface (S20) have a critical point, light can be refracted from the area surrounding the critical point to the entire area of ​​the 11th lens (121). Additionally, since the 19th and 20th surfaces (S19, S20) have a critical point, incident light can be refracted to the entire area of ​​the 11th lens (121) even if it is moved along the optical axis. The critical point is a point where the trend of the Sag (Sagittal) value changes. That is, the critical point is a point on the lens surface where the Sag value increases and then decreases, or where the Sag value decreases and then increases. The above Sag value is the optical axis distance between the straight line perpendicular to the center of each lens surface and the lens surface; the Sag value has a positive value for positions located closer to the sensor than the center of each lens surface, and a negative value for positions located closer to the object than the center of each lens surface.

[0110]

[0111] The first lens (121) may have a positive or negative refractive power on the second optical axis (OA2), for example, it may have a positive refractive power. The first lens (121) may include a plastic or glass material, for example, it may be a plastic material. The first lens (121) may include an object-side second surface (S21) and a sensor-side second surface (S22). On the second optical axis (OA2), the second surface (S21) may have a convex shape, and the second surface (S22) may have a convex shape. That is, the first lens (121) may have a convex shape on both sides. Alternatively, the second surface (S21) may have a concave shape, and the second surface (S22) may have a convex shape. Alternatively, the 21st surface (S21) may have a convex shape, and the 22nd surface (S22) may have a concave shape. At least one or all of the 21st surface (S21) and the 22nd surface (S22) of the 11th lens (121) may be aspherical. The 4th to 10th aspherical coefficients (AI) and conic constants (K) of the 21st and 22nd surfaces (S21, S22) can be represented as L11S21 and L11S22 of FIG. 5.

[0112]

[0113] The center thickness (CT6) of the sixth lens (116) may be the thickest among the center thicknesses of the second to eleventh lenses (112-121). The center thicknesses (CT1-CT11) of the first to eleventh lenses (111-121) may satisfy the following conditions.

[0114] Condition 1: (CT2+CT3) < CT1 Condition 2: CT2 < CT3 < CT5

[0115] Condition 3: CT5 < CT11 < CT6 Condition 4: CT10 < CT7 < CT9

[0116] Condition 6: CT7 < CT8 < CT11

[0117] The effective length may increase sequentially from the second lens (112) to the fifth lens (115), decrease sequentially from the fifth lens (115) to the eighth lens (118), and increase sequentially from the eighth lens (118) to the eleventh lens (121). Here, the expression that the effective length increases and decreases sequentially includes the meaning of increasing or decreasing continuously or discontinuously, or means comparing values ​​rounded to the first decimal place of the effective length.

[0118] Since the 22nd surface (S22) of the 11th lens (121) is provided in a convex shape, incident light can be refracted toward the entire area of ​​the image sensor (190). The effective length of the 11th lens (121) can be provided to be longer than the effective length of the 10th lens (120). The effective length of the 10th lens (120) can be provided to be longer than the effective length of the 9th lens (119). At least one of the 5th, 6th, and 11th lenses (115, 116, 121) may have an effective length in the 3rd direction (Z) that is shorter than the effective length in the 2nd direction (Y). For example, at least one or more of the 5th, 6th, and 11th lenses (115, 116, 121) may have a non-circular shape. Accordingly, an increase in the thickness (H0) of the optical system (100) can be suppressed.

[0119]

[0120] At least one or all of the second to fourth lens groups (LG2-LG4) among the plurality of lens groups (LG1-LG5) may be moved toward the object or sensor side along the second optical axis (OA2). The camera module may include a driving member (not shown). The driving member includes a first driving member (not shown) disposed outside the third lens group (LG3), a second driving member (not shown) disposed outside the fourth lens group (LG4), and a third driving member (not shown) disposed outside the fifth lens group (LG5), and may move the second to fourth lens groups (LG2-LG4) respectively in the direction of the second optical axis (OA2) according to the operation mode.

[0121] The above operating mode may include a first mode for moving to shoot at a first magnification as shown in FIGS. 1 and 2, and a third mode for moving to shoot at a second magnification higher than the first magnification as shown in FIG. 3(b). Additionally, the above operating mode may include a second mode having a magnification between the first and third modes as shown in FIG. 3(a). Here, the first magnification may be the lowest magnification of the optical system (100), and the second magnification may be the highest magnification of the optical system (100). The first mode may be a wide mode, the second mode may be a middle mode, and the third mode may be a tele mode. The initial operating mode of the camera module may be any one of the first, second, and third modes, for example, the second mode or the middle mode. For example, in the first mode, each of the second to fourth lens groups (LG2, LG4) may be located at a position defined as a first position (Position 1). As shown in FIG. 3(a), in the second mode, each of the third and fourth lens groups (LG3, LG4) may be located at a position defined as a second position (Position 2) that is closer to the object or the first lens (111) than the first position, and the second lens group (LG2) may be located in a direction closer to the sensor than the first position. As shown in FIG. 3(b), in the third mode, each of the second to fourth lens groups (LG2-LG4) may be located at a position defined as a third position (Position 3) that is closer to the object or the first lens (111) than the second position.

[0122] The center spacing (CG2) between the first and second lens groups (LG1, LG2), the center spacing (CG4) between the second and third lens groups (LG2, LG3), the center spacing (CG7) between the third and fourth lens groups (LG3, LG4), and the center spacing (CG10) between the fourth and fifth lens groups (LG4, LG5) can be varied according to the operating mode. Accordingly, the optical system (100) can control the effective focal length and magnification of the optical system (100) by controlling the position of some lens groups according to the operating mode. The center spacing (BFL) between the eleventh lens (121) and the image sensor (190) can be fixed.

[0123]

[0124] The maximum effective length (CA1) of the first lens (111) is the maximum among the lenses, and at least one of the effective lengths (CA8) of the eighth lens (118) is the minimum among the lenses. The maximum effective length (CA1) of the first lens (111) may be 7 mm or more. The effective length (CA8) of the eighth lens (118) may be 4.2 mm or less. The average effective length (CA1-CA11) of each lens may satisfy the following conditions.

[0125] Condition 1: CA3 < CA1 Condition 2: CA4 < CA5

[0126] Condition 3: CA8 < CA5 < CA11 Condition 4: CA8 < CA11 < CA8*2

[0127]

[0128] In terms of the absolute value of the radius of curvature, the number of lenses in which the difference in the radius of curvature between the object side and the sensor side of each lens is 30 mm or less may be 5 or more, for example, in the range of 5 to 8. By arranging lenses with such a small difference in radius of curvature, the increase in the spacing between adjacent lenses within each lens group can be suppressed. The absolute difference in the radius of curvature between the 17th surface (S17) and the 18th surface (S18) of the 9th lens (119) may be the smallest among the differences in the radius of curvature (absolute value) between the object side and the sensor side of each lens, for example, 10 mm or less. The absolute difference in the radius of curvature between the 5th surface (S5) and the 6th surface (S6) of the 3rd lens (113) may be the largest among the differences in the radius of curvature (absolute value) between the object side and the sensor side of each lens, for example, 100 mm or more.

[0129] Among the center thicknesses of the first to eleven lenses (111-121) above, the number of lenses having a center thickness of 1 mm or more is 3 or more, for example, 3 to 4, and the number of lenses having a center thickness of less than 1 mm is 6 or more, for example, in the range of 6 to 7. By setting the center thickness and radius of curvature of these lenses, light can be guided to the effective area of ​​the fixed eleven lens (121) without significantly changing the path of the incident light. Among the second to eleven lenses (112-121), the lens having the thickest edge thickness (ET) is the eighth lens (118), and the lens having the thinnest edge thickness (ET) is the fourth lens. Among the edge thicknesses (ET) of the second to eleventh lenses (112-121) above, the number of lenses having an edge thickness of 1 mm or more is 2 or fewer, for example, 1 to 2 lenses, and the number of lenses having an edge thickness of 1 mm or less is 8 or more, for example, in the range of 8 to 9 lenses. By setting the edge thickness and radius of curvature of these lenses, light can be guided to the effective area of ​​the eleventh lens (121) which is fixed in position without significantly changing the path of the incident light.

[0130]

[0131] The optical axis distances of the first lens group (LG1) to the fifth lens group (LG5) are defined as TDLG1, TDLG2, TDLG3, TDLG4, and TDLG5, and may satisfy the following conditions.

[0132] Condition 1: 7 mm < TDLG1 < 12 mm

[0133] Condition 2: 1mm < TDLG2 < TDLG4 < TDLG3 < 7mm

[0134] Condition 3: TDLG2*2 < TDLG3 < TDLG5*5

[0135] In terms of the absolute value of the focal length, the focal length (F1) of the first lens (111) may be the largest among the lenses. The difference (absolute value) in the focal lengths of the first and second lenses (111, 112) may be the smallest among the differences (absolute values) in the focal lengths (absolute values) of adjacent lenses. The focal lengths (F1-F11) of the first to eleventh lenses (111-121) may satisfy the following conditions.

[0136] Condition 1: │F2│*2 < F1

[0137] Condition 2: 5 mm < F5 < │F3│ < │F2│ < 50 mm

[0138] Condition 3: 0 < F11 < │F8│ < │F9│ < 30 mm

[0139] Condition 4: (F6+│F10│+F11) <│F4│

[0140] Condition 5: F6 < │F7│ < │F8│ < F9

[0141] Among the first to fifth lens groups (LG1, LG2, LG3, LG4, LG5) above, the lens group with the greatest refractive power is the third lens group (LG3), and among the moving second to fourth lens groups (LG2-LG4), the lens group with the greatest effective length may also be the third lens group (LG3). Accordingly, the third lens group (LG3) can reduce aberrations and ensure visibility. Here, the effective length of the lens group is the average of the effective lengths of the object-side and sensor-side of the lenses within each lens group. Additionally, the first lens (111) can be constructed as a component having a prism and lenses to reduce the overall length and the number of lenses.

[0142] The relationships between CG2, CG4, CG7, CG10, and BFL in the 1st, 2nd, and 3rd modes are as follows.

[0143] Mode 1: 0 < CG10 < BFL < CG2 < CG7 < CG4 < 11 mm

[0144] Second Mode: 0.5 mm < CG4 < CG2 < CG10 < CG7

[0145] 3rd Mode: BFL < CG2 < CG4 < CG7 < CG10 < 10 mm

[0146] The minimum moving distance of the lens group that moves according to the first to third modes above can be set to be 0.2 mm or more, and the maximum moving distance can be set to be 11 mm or less. The zoom magnification of the optical system (100) according to this moving distance can have a magnification change of 1x or more, for example, 1x to 3.5x. For example, if the focal length of the wide mode is 7.5 mm, the focal length of the tele mode can be 26.4 mm.

[0147]

[0148] Among the 2nd, 3rd, and 4th lens groups (LG2, LG3, LG4) in the above 1st, 2nd, and 3rd modes, the maximum moving distance is the moving distance (mMd13) in the 1st and 3rd modes, defined as Max_mMd13, and can satisfy 5mm < Max_mMd13 < 11mm, and preferably, 7mm < Max_mMd13 < 11mm. The lens group that moves the most in the above 1st, 2nd, and 3rd modes is the 3rd lens group (LG3). In the first, second, and third modes, the minimum travel distance among the second, third, and fourth lens groups (LG2, LG3, LG4) is the travel distance (mMd12) in the first and second modes, defined as Min_mMd12, and can satisfy 0mm < Min_mMd12 < 0.5mm, and preferably 0mm < Min_mMd12 < 0.3mm. In the first, second, and third modes, the lens group that moves the minimum is the fourth lens group (LG4). Accordingly, the maximum travel distance for zoom magnification is reduced, thereby reducing the power consumption of the driving member.

[0149] Depending on the operating mode, the F number of the optical system (100) provides a brightness of 2.0 or higher, and the F number may be in the range of 2.0 to 4.0. The aperture may be located between the second lens group (LG2) and the third lens group (LG3), and may be positioned, for example, around the perimeter of the ninth surface (S9) of the fifth lens (115).

[0150]

[0151] FIG. 4 is an example showing the values ​​of an optical system according to an embodiment. In FIG. 4, the lenses are defined as Lens 1 to Lens 11, and represent the radius of curvature of each lens, the thickness of each lens along the optical axis (CT), the distance between adjacent lenses along the optical axis (CG), the effective length of each lens surface (S1-S22) (CA), the Abbe number (Ad), the refractive index (Nd), and the effective focal length of each lens. FIG. 5 represents the radius of curvature (R), conic constant (K), and aspherical coefficients from the 4th to the 10th order (AD) of the object-side and sensor-side surfaces of the 1st to 11th lenses (111-121) of FIG. 1.

[0152] Table 1 is for items of the mathematical formulas described above in the optical system (100) of the embodiment, and shows the Total Track Length (TTL), focal lengths of each lens group (FLG1-FLG5), ImgH (mm), and optical axis distances of each lens group (TDLG1, TDLG2, TDLG3, TDLG4, TDLG5) of the optical system (100), and the unit is mm.

[0153] Item Example Item Example 1 FLG1 - 39.1 TDLG1 1.607 FLG2 - 26.6 TDLG2 1.415 FLG3 7.3 TDLG3 4.213 FLG4 - 5.4 TDLG4 3.181 FLG4 6.9 TDLG5 1.482 I mg H2 72 TTL 35.307

[0154] Table 2 shows the effective focal length (F), field of view (FOV), F number (Fno), entrance pupil size (EPD), optical axis distance SD from the aperture to the sensor side of the last lens, optical axis distance TD from the first lens (111) to the last lens (121), and center spacing (CG2, CG4, CG7, CG10) between adjacent lens groups according to the first to third modes of the optical system according to the embodiment.

[0155] Item 1 Mode 2 Mode 3 F (mm) 7.500 16.99 626.400 CG2 (mm) 0.208 3.09 40.200 CG4 (mm) 8.61 51.21 50.279 CG7 (mm) 3.20 34.09 94.220 CG10 (mm) 0.17 23.78 97.499 BFL (mm) 1.21 1.21 1.21 EPD (EPD1 / EPD2 / EPD3) 3.18 85.64 57.473 Fno (Fno1 / Fno2 / Fno3) 2.35 23.01 13.533 FOV (Degrees) 40 18 12 SD (mm) 12.25 116.76 520.594 TD (mm) 34.10 34.10 34.10

[0156] FIGS. 6 (a), (b), and (c) are graphs showing the diffraction modulation transfer function (MTF) in the optical system of FIGS. 2 to 3 (a) and (b), and represent the modulation of luminance according to spatial frequency. FIGS. 7 to 9 are graphs showing the astigmatic field curves and distortion aberrations measured from left to right in the aberration graph of the optical system according to the embodiment. In FIGS. 7 to 9, the X-axis may represent the focal length (mm) and distortion (%), and the Y-axis may represent the image height (IMG HT). The graphs for astigmatic field curves and distortion aberrations are for light in the 546 nm wavelength band. In the aberration graph, it can be interpreted that the closer each curve is to the Y-axis, the better the aberration correction function, and it can be seen that the change in aberration according to the operating mode (wide, mid, tele modes) is not significant. FIG. 10 is a graph showing distortion in an image of an optical system, where the X-axis represents the height of the image and ranges from 0 field (center) to 1.0 field (diagonal end), and the y-axis represents the distortion value. It can be seen that the distortion values ​​are located in the range of -0.8 to 0 across the entire field.

[0157]

[0158] The camera module according to the embodiment has improved resolution and can have good optical performance in the center and periphery of the field of view (FOV). The lens optical system of the embodiment according to the invention is a combination of an object-side lens having a reflective surface and nine or more lenses, which is compact and lightweight, while simultaneously correcting spherical aberration, astigmatism, distortion, chromatic aberration, and coma aberration well, thereby enabling the realization of high resolution, so it can be embedded in and utilized in the optical device of a camera. The optical system (100) according to the embodiment can satisfy at least one or two of the mathematical formulas described below. Accordingly, the optical system (100) according to the embodiment can effectively correct aberrations that change according to the change in operating mode. The optical system (100) can adjust the zoom magnification for a subject at various magnifications and can have a slim and compact structure. In the following, the distance between two adjacent lenses can be distinguished into a distance along the optical axis and an edge distance. The effective length of each lens or each lens surface (object side or sensor side) is expressed as the effective diameter in the case of a circular shape, and as the maximum effective length in the case of a non-circular shape. The thickness is the optical axis or center thickness, and the units of the spacing, thickness, effective diameter, focal length, etc. are mm.

[0159] [Mathematical Formula 1] FLG1 < 0

[0160] In Equation 1, FLG1 is the focal length of the first lens group (LG1), and the first lens (111) of the first lens group (LG1) can perform the function of a prism having refractive power. Additionally, the first lens (111) can perform the function of an OIS. Light incident by the first lens group (LG1) can be refracted across the entire area of ​​the second lens group (LG2). Here, the absolute value of the focal length of the first lens group (FLG1) may be greater than the absolute value of the focal length of the second to fifth lens groups (FLG2-FLG5). Equation 1 may satisfy 20mm < FLG1 < 70mm.

[0161] [Mathematical Equation 2] 1 < |L1R1| / |L1R2| < 5

[0162] In mathematical formula 2, L1R1 is the radius of curvature on the first optical axis (OA1) of the first object-side surface (S1) of the first lens (111), and L1R2 is the radius of curvature on the second optical axis (OA2) of the second sensor-side surface (S2) of the first lens (111). That is, the absolute value of the radius of curvature of the first surface (S1) can be greater than the absolute value of the radius of curvature of the second surface (S2). In addition, the effective lengths (CAS1, CAS2) of the first and second surfaces (S1, S2) can satisfy CAS2 < CAS1. Accordingly, the reduction of the amount of light incident through the first lens (111) can be suppressed and reflected to the second surface (S2) through the reflective surface (RS0). Since the effective length of the second surface (S2) is provided small, the increase in the effective lengths of the second to fourth lenses (112, 113, 114) can be suppressed. Preferably, mathematical formula 2 can satisfy 1 < |L1R1| / |L1R2| < 2.

[0163] [Mathematical Formula 3] 30 mm < F1 < 200 mm

[0164] F1 represents the refractive power of the first lens (111) and has a positive value. As the first lens (111) has a positive refractive power, the effective length of the second surface (S2) can be reduced, and the increase in the effective length of the second to fourth lenses (112-114) can also be suppressed. Equation 3 can satisfy 70 mm < F1 < 120 mm.

[0165] [Mathematical Equation 4] L1R1 < 0

[0166] In mathematical formula 4, L1R1 may have a concave shape on the first optical axis (OA1) of the first object-side surface (S1) of the first lens (111).

[0167] [Mathematical Equation 5] 1 < |L1R2| / CT1 < 5

[0168] CT1 is the thickness at the optical axis of the first lens (111) and may be smaller than the absolute value of the radius of curvature of the second surface (S2). Equation 5 may satisfy 2 < |L1R2| / CT1 < 4.

[0169] [Mathematical Formula 6] 3 < TDLG1 / TDLG2 < 15

[0170] TDLG1 is the distance along the optical axis of a first lens group (LG1) having first and second lenses (111, 112) adjacent to an object, and TDLG2 is the distance along the optical axis of a second lens group (LG2) having third and fourth lenses (113, 114) positioned between first and third lens groups (LG2, LG3). When Equation 6 is satisfied, the optical system (100) has a relatively small TTL and can secure a peripheral light intensity ratio. Preferably, Equation 6 can satisfy 6 < TDLG1 / TDLG2 < 10. In Equation 6, the TTL can be adjusted by setting the optical axis distance of the first and second lens groups (LG1, LG2).

[0171] [Mathematical Equation 7] CA2 < CA4 < CA5

[0172] CA2, CA4, and CA5 are the average effective lengths of the object-side and sensor-side surfaces of the second, fourth, and fifth lenses (112, 114, 115). The effective lengths can gradually increase from the second lens (112) toward the fifth lens (115). The second to fifth lenses (112-115) can increase the amount of incident light and refract it toward the entire area of ​​the image sensor (190).

[0173] [Mathematical Formula 8] CA8 < CA7 < CA6 < CA5

[0174] CA5-CA8 is the average effective length of the object-side and sensor-side of the 5th, 6th, 7th, and 8th lenses (115-118). The effective length may gradually decrease from the 5th lens (115) toward the 8th lens (118). The 5th to 8th lenses (115-118) can refract light passing through the 5th lens (115) toward the entire area of ​​the image sensor (190).

[0175] [Mathematical Formula 9] CA8 < CA9 < CA10 < CA11

[0176] CA8-CA11 is the average effective length of the object-side and sensor-side of the 8th to 11th lenses (118-121). The effective length can gradually increase from the 8th lens (118) toward the 11th lens (121). Accordingly, the 8th to 11th lenses (118-121) can refract light passing through the 8th lens (118) toward the center and periphery of the image sensor (190).

[0177] [Mathematical Formula 10] FLG5 > 0

[0178] In Equation 10, FLG5 is the effective focal length of the fifth lens group (LG5) and can have a value greater than 0. FLG5 is the focal length of the eleventh lens. If Equation 10 is satisfied, the optical aberration of the fifth lens group (LG5) of the optical system can be improved.

[0179]

[0180] [Mathematical Formula 11] 0 < FLG3 / Md1F < 1.5

[0181] FLG3 is the focal length of the third lens group, and Md1F is the effective focal length of the optical system in the first mode. If Equation 11 is satisfied, the aberration characteristics can be improved. Preferably, 0.5 < FLG3 / Md1F < 1 can be satisfied.

[0182] [Mathematical Equation 12] 0 < FLG3 < |FLG2| < FLG1

[0183] In mathematical formula 12, the aberration characteristics can be improved by adjusting the focal lengths of the first, second, and third lens groups (LG1, LG2, LG3).

[0184] [Mathematical Formula 13] 2 < TTL / TDLG1 < 5

[0185] In Equation 13, TTL is the sum of the optical axis distance (TL2) from the center of the first surface of the first lens to the reflective surface (RS0) and the optical axis distance (TL1) from the center of the reflective surface (RS0) to the top surface of the image sensor (190), and if Equation 13 is satisfied, TTL can be adjusted. If the optical system (100) satisfies Equation 13, the optical system (100) has a relatively small TTL and can secure a peripheral light intensity ratio. Preferably, Equation 13 can satisfy 2 < TTL / TDLG1 < 4.

[0186]

[0187] [Mathematical Equation 14] 1 < Md1F / Md1EPD < 3

[0188] Md1F is the effective focal length of the optical system in the first mode, and Md1EPD represents the entrance pupil diameter (EPD) in the first mode. If Equation 14 is satisfied, the brightness of the optical system can be controlled. Preferably, 2 < Md1F / Md1EPD < 3 can be satisfied. In addition, since Equation 14 is satisfied, the F-number can be secured to be 2.0 or higher in wide mode.

[0189] [Mathematical Formula 15] 10 < CT1 / CT2 < 50

[0190] In mathematical formula 15, the center thickness (CT1) of the first lens (111) is greater than the center thickness (CT3) of the second lens (112), and if this is satisfied, the aberration characteristics in the optical system (100) can be improved. Preferably, 20 < CT1 / CT2 < 40 can be satisfied.

[0191] [Mathematical Formula 16] 1 < CT3 / CT2 < 3

[0192] In mathematical formula 16, the center thickness (CT3) of the third lens (113) may be greater than the center thickness (CT2) of the second lens (112), and if this is satisfied, the optical system (100) can improve aberration characteristics. Mathematical formula 16 preferably satisfies 1.5 < CT1 / CT3 < 2.5.

[0193] [Mathematical Formula 17] 15 < |Vd2 - Vd1| < 40

[0194] In mathematical formula 17, Vd2 represents the Abbe number of the second lens, and Vd1 represents the Abbe number of the first lens. If the absolute value of the difference in Abbe numbers between the first and second lenses according to the embodiment satisfies mathematical formula 17, the optical system (100) can improve chromatic aberration characteristics.

[0195] [Mathematical Equation 18] 0 < |Vd11 - Vd1| < 10

[0196] In mathematical formula 18, Vd11 represents the Abbe number of the eleventh lens. If the absolute value of the difference in Abbe numbers between the eleventh and eleventh lenses satisfies mathematical formula 18, the optical system (100) can improve chromatic aberration characteristics. Preferably, the conditions Vd1 < Vd11 and 45 < Vd11 can be satisfied.

[0197] [Mathematical Formula 19] 1.60 < Nd1

[0198] In Equation 19, Nd1 represents the refractive index of the first lens at the d-line. Since the first lens may be provided as a plastic material and as an aspherical lens, it can refract the path of the incident light toward the exit side. If the optical system (100) according to the embodiment satisfies Equation 19, it can disperse the incident light and suppress the increase in the effective area of ​​the second and third lenses placed closer to the sensor side than the first lens. Preferably, it can satisfy 1.65 < Nd1.

[0199] Condition: Nd11*Vd11 < Nd2*Vd2

[0200] The product of the Abbe number (Vd2) and refractive index (Nd2) of the second lens and the Abbe number (Vd11) and refractive index (Nd11) of the eleventh lens can satisfy the following conditions.

[0201] Condition: Nd11*Vd11 < Nd2*Vd2

[0202] [Mathematical Formula 20] 0.1mm < CG1 < 1mm

[0203] CG1 is the distance at the second optical axis (OA2) between the first lens (111) and the second lens (112). If Equation 20 is satisfied, the first lens (111) and the second lens (112) can be in close contact, and the increase in the effective diameter of the second lens (112) can be suppressed.

[0204] [Mathematical Equation 21] L2R1 < 0

[0205] In Equation 21, L2R1 represents the radius of curvature of the first surface (S3) on the object side of the second lens (112). If the optical system (100) satisfies Equation 21, the optical system (100) can reduce light loss passing through the first lens group (LG1) and control stray light.

[0206] [Mathematical Formula 22] L3R1 < 0

[0207] In mathematical formula 22, the radius of curvature on the second optical axis (OA2) of the object side surface (S5) of the third lens (113) is set to a negative value, thereby reducing the beam size.

[0208] [Mathematical Equation 23] 0 < |L1R1 / L3R1| < 1

[0209] In Equation 23, L1R1 represents the radius of curvature of the first object-side surface (S1) of the first lens on the first optical axis (OA1), and L3R1 represents the radius of curvature of the fifth object-side surface (S5) of the third lens on the second optical axis (OA2). If Equation 23 is satisfied, the optical axis spacing between the first and second lens groups can be reduced, and the increase in beam size can be suppressed.

[0210] [Mathematical Formula 24] 1 < L4R2 / L5R1 < 10

[0211] In Equation 24, the radius of curvature (L4R2) of the sensor-side 8th surface (S8) of the 4th lens and the radius of curvature (L5R1) of the object-side 9th surface (S9) of the 5th lens can be set on the 2nd optical axis (OA2). If the optical system (100) satisfies Equation 24, an optical path leading to the 2nd and 3rd lens groups can be set.

[0212] [Mathematical Equation 25] 1 < |L1R1 / L11R2| < 10

[0213] L11R2 represents the radius of curvature of the sensor-side 16th surface (S16) of the 11th lens on the second optical axis (OA2). Preferably, 1 < |L1R1 / L11R2| < 5 can be satisfied. When Equation 25 is satisfied, the first lens and the light path traveling through the first lens can be adjusted to correspond to the size of the image sensor.

[0214] [Mathematical Formula 26] 1 < Md12_mLG3 / TDLG3 < 3

[0215] In Equation 26, Md12_mLG3 represents the difference in center spacing after movement of the third lens group (LG3) when changing from the second mode to the first mode or from the first mode to the second mode. Specifically, Md12_mLG3 represents the distance traveled by the third lens group (LG3) in the first and second modes, and represents the difference between the optical axis spacing between the second and third lens groups (LG2, LG3) in the first mode and the optical axis spacing between the second and third lens groups (LG3, LG4) in the second mode. When the optical system (100) satisfies Equation 26, the optical system (100) can minimize the distance traveled by the third lens group (LG3) when changing the magnification and can have a slim size. In addition, the distance traveled can be minimized when controlling the position of the third lens group (LG3), thereby enabling improved power consumption characteristics. Preferably, 1.2 < Md12_mLG3 / TDLG3 < 2.2 or TDLG3 < Md12_mLG3 can be satisfied.

[0216]

[0217] [Mathematical Equation 27] 0 < Md23_mLG3 / TDLG3 < 1

[0218] In Equation 27, Md23_mLG3 represents the difference in center spacing after movement of the third lens group (LG3) when operating from the second mode to the third mode, or from the third mode to the second mode. Specifically, Md23_mLG3 represents the difference between the optical axis spacing between the second and third lens groups (LG2, LG3) in the second mode and the optical axis spacing between the second and third lens groups (LG2, LG3) in the third mode. In the third mode, the maximum movement distance of the third lens group (LG3) may be smaller than the maximum movement distance of the fourth lens group (LG4). When the optical system (100) according to the embodiment satisfies Equation 27, the optical system (100) can minimize the movement distance of the third lens group (LG3) when changing the magnification, thereby allowing it to have a slim size. Additionally, the movement distance can be minimized when controlling the position of the third lens group (LG3), thereby allowing it to have improved power consumption characteristics. Preferably, 0.1 < Md23_mLG3 / TDLG3 < 0.5 or Md23_mLG3 < TDLG3 can be satisfied.

[0219] [Mathematical Formula 28] 0 < Md12_mLG4 / TDLG4 < 1

[0220] Equation 28 can set the moving distance (Md12_mLG4) of the fourth lens group (LG4) and the optical axis distance (TDLG4) of the fourth lens group (LG3) in the first and second modes. If the optical system (100) satisfies Equation 26, the optical system (100) can adjust the focus by adjusting the moving distance of the fourth lens group (LG4). Preferably, 0.1 < Md12_mLG4 / TDLG4 < 0.5 can be satisfied.

[0221] [Mathematical Formula 29] 0 < Md23_mLG4 / TDLG4 < 0.5

[0222] In Equation 29, Md23_mLG4 represents the difference in center spacing after movement of the fourth lens group (LG4) when changing from the second mode to the third mode, or from the third mode to the second mode. If the optical system (100) satisfies Equation 29, the optical system (100) can minimize the movement distance of the fourth lens group (LG4) when changing the magnification, thereby allowing it to have a slim size. Additionally, power consumption can be improved due to the reduction in movement distance when controlling the position of the fourth lens group (LG4). Preferably, 0 < Md23_mLG4 / TDLG4 < 0.2 can be satisfied.

[0223] [Mathematical Formula 30] 1 < Md13_mLG2 / TDLG2 < 3

[0224] In Equation 30, Md13_mLG1 represents the difference in center spacing after movement of the second lens group (LG2) when operating from the first mode to the third mode, or from the third mode to the first mode. Specifically, Md13_mLG2 represents the difference between the optical axis spacing between the first and second lens groups (LG1, LG2) in the first mode and the optical axis spacing between the first and second lens groups (LG1, LG2) in the third mode. When the optical system (100) satisfies Equation 30, the optical system (100) can minimize the movement distance of the second lens group (LG2) when changing the magnification, thereby allowing it to have a slim size. Preferably, 1.5 < Md13_mLG2 / TDLG2 < 2.5 can be satisfied.

[0225] [Mathematical Formula 31] 5mm < Max_CG11 < Max_CG4 < 11mm

[0226] Max_CG4 is the maximum optical axis distance between the fourth lens (114) and the fifth lens (115) according to the operation mode, and Max_CG11 is the maximum optical axis distance between the tenth lens (120) and the eleventh lens (121) according to the operation mode. Since it satisfies Equation 31, the zoom magnification of the optical system (100) can be adjusted.

[0227]

[0228] [Mathematical Formula 32] 10 < Md1(CG4 / CG2) < 60

[0229] In Equation 32, Md1(CG4 / CG2) represents the ratio between the center spacing (CG4) between the second and third lens groups in the first mode and the center spacing (CG2) between the first and second lens groups. If the optical system (100) according to the embodiment satisfies Equation 32, the optical system (100) may have improved optical characteristics at the first magnification. Specifically, the optical system (100) may have improved aberration characteristics at the first magnification and may improve the optical performance of the center and periphery of the field of view (FOV). Preferably, 30 < Md1(CG2 / CG4) < 50 may be satisfied.

[0230] [Mathematical Equation 33] 1 < Md1(CG4 / CG7) < 5

[0231] In Equation 33, Md3(CG4 / CG7) represents the ratio between the center spacing (CG4) between the second and third lens groups and the center spacing (CG7) between the third and fourth lens groups in the first mode. If the optical system (100) according to the embodiment satisfies Equation 33, the optical system (100) may have improved optical characteristics at the first magnification. Specifically, the optical system (100) may have improved aberration characteristics at the first magnification and may improve the optical performance of the periphery of the field of view (FOV). Preferably, 2 < Md1(CG4 / CG6) < 4 may be satisfied.

[0232] [Mathematical Formula 34] 4mm < Max_mMd13 < 11mm

[0233] Max_mMd13 is the maximum center distance between adjacent lenses when the 2nd-4th lens group (LG2-LG4) moves according to the 1st to 3rd modes. If Equation 34 is satisfied, the center distance between lenses in an optical system having a variable lens group can be set, and the power consumption of the driving member during movement can be reduced. Preferably, 5mm < Max_mMd13 < 10mm can be satisfied.

[0234] [Mathematical Formula 35] 5 < CAS1 / CAS2 < 30

[0235] CAS1 is the effective length of the first surface (S1) on the object side of the first lens, and CAS2 is the effective length of the second surface (S2) on the sensor side of the first lens. If Equation 35 is satisfied, the effective lengths of the incident side surface and the exit side surface of the first lens (111) having a reflective surface and refractive power can be set. Preferably, 15 < CAS1 / CAS2 < 25 can be satisfied.

[0236] [Mathematical Formula 36] 1 < CT1 / CAS2 < 3

[0237] In mathematical formula 36, ​​the thickness of the first lens (111) at the optical axis and the effective length of the second surface (S2) can be set. If mathematical formula 36 is satisfied, the effective length of the second surface (S2) on the exit side of the first lens can be reduced, thereby suppressing the increase in the effective length of the second to fourth lenses. Preferably, 1.5 < CT1 / CAS2 < 2.5 can be satisfied.

[0238] [Equation 37] Md3_Fno ≤ 4.0

[0239] Md3_Fno is the F-number of the optical system in the third mode. If the optical system satisfies Equation 36, it can provide a bright optical system.

[0240] [Mathematical Formula 38] 0.2mm < BFL < 3mm

[0241] BFL is the optical axis spacing between the fifth lens group and the image sensor. If the optical system satisfies Equation 38, space for installing optical components, such as optical filters, can be secured between the last lens and the image sensor. Preferably, 0.5mm < BFL < 2mm can be satisfied.

[0242] [Equation 39] 0 < BFL / ImgH < 1

[0243] ImgH is half the diagonal length of the image sensor. If Equation 39 is satisfied, the distance between the image sensor and the last lens can be set, and the light incident on the last lens can be refracted across the entire area of ​​the image sensor.

[0244] [Equation 40] 5 < TTL / ImgH < 20

[0245] If the optical system (100) satisfies mathematical formula 40, the optical system (100) may have a smaller TTL, so the optical system (100) may be provided in a slim and compact manner. Additionally, the height of the optical system (100) may be set. Preferably, it may be in the range of 8 < TTL / ImgH < 15.

[0246] [Mathematical Formula 41] 2mm < ImgH

[0247] Equation 41 can set half of the diagonal length of the image sensor (190) and can provide the size of the image sensor of the zoom magnification optical system. Equation 41 can preferably satisfy 2.2mm < ImgH < 5mm.

[0248] [Mathematical Formula 42] 1 < │ FLG1 / FLG2 │ < 5

[0249] In Equation 42, FLG1 represents the focal length of the first lens group (LG1), and FLG2 represents the focal length of the second lens group (LG2). If Equation 42 is satisfied, the size of the optical system can be reduced, for example, the TTL can be reduced. Preferably, FLG1 < 0 and FLG2 < 0.

[0250]

[0251] [Mathematical Formula 43] 1 < Md3F / Md1F < 6

[0252] In Equation 43, Md1F is the effective focal length of the optical system in the first mode, and Md3F is the effective focal length of the optical system in the third mode. Preferably, 2 < Md3F / Md1F < 5 can be satisfied. If the optical system satisfies Equation 43, the effective focal length can be adjusted according to the first and third modes.

[0253] [Equation 44] 2 < Md2F / EPD2 < 6

[0254] In Equation 44, Md2F is the effective focal length of the optical system in the second mode (Middle), and EPD2 represents the size of the entrance pupil of the optical system (100) in the second mode. If the optical system (100) according to the embodiment satisfies Equation 44, the optical system (100) can secure a bright image during the second mode operation. Preferably, 2 < Md2F / EPD2 < 4 can be satisfied.

[0255] [Equation 45] 1 < Md1F / EPD1 < 4

[0256] In Equation 45, Md1F is the effective focal length of the optical system in the first mode (Wide), and EPD1 represents the size of the entrance pupil of the optical system (100) during operation in the first mode. If the optical system (100) according to the embodiment satisfies Equation 45, the optical system (100) can secure a bright image during operation in the first mode. Preferably, 1 < Md1F / EPD1 < 3 can be satisfied.

[0257] [Equation 46] 1 < CA_Max / ImgH < 4

[0258] In Equation 46, CA_Max represents the largest effective length (CA) among the lens surfaces of the plurality of lenses included in the optical system (100). ImgH represents half the diagonal length of the image sensor (190), and represents half the maximum diagonal length of the effective area of ​​the image sensor (190). If the optical system (100) according to the embodiment satisfies Equation 46, the optical system (100) can be provided in a slim and compact manner. In addition, the optical system (100) can achieve high resolution and high image quality.

[0259] [Equation 47] 1 < Md1F / ImgH < 6

[0260] If the optical system (100) according to the embodiment satisfies Equation 47, the effective focal length of the first mode can be set according to the effective length of the image sensor. Preferably, 23 < Md1F / ImgH < 4 can be satisfied.

[0261] [Equation 48] 4 < Md3F / ImgH < 15

[0262] If the optical system (100) according to the embodiment satisfies Equation 48, the effective focal length (Md3F) can be set in the third mode of the optical system for the effective area of ​​the image sensor. Preferably, 5 < Md3F / ImgH < 13 can be satisfied.

[0263] [Mathematical Formula 49] 1 < Md3F / Max_mMd13 < 5

[0264] Md3F is the effective focal length of the optical system in the third mode, and Max_mMd13 can set the maximum travel distance in the first to third modes. Preferably, 2 < Md3F / Max_mMd13 < 4 can be satisfied.

[0265]

[0266] [Mathematical Formula 50] 10mm < TTL < 50mm

[0267] TTL refers to the distance along the optical axes (OA1, OA2) from the center of the first surface (S1) of the first lens to the surface of the image sensor (190). By setting TTL to exceed 10mm in Equation 50, a zoom magnification optical system can be provided. Preferably, 20mm < TTL < 40mm can be satisfied.

[0268] [Equation 51] 0 < Md1F / TTL < 1

[0269] Equation 51 can set the focal length and total length (TTL) of the optical system in the first mode, thereby configuring the size of the optical system and a narrow angle of view. Preferably, 0 < Md1F / TTL < 0.5 can be satisfied.

[0270] [Mathematical Equation 52] 8° < FOV3 < FOV2 < FOV1 < 45°

[0271] In mathematical formula 51, FOV (Field of view) refers to the angle of view (Degree) in the diagonal direction of the optical system (100), FOV1 is the angle of view in the first mode, FOV2 is the angle of view in the second mode, and FOV3 is the angle of view in the third mode, and can be set in the order of angles of wide, middle, and tele modes according to the operation mode. Preferably, 10° < FOV2 < 30° can be satisfied.

[0272] [Mathematical Equation 53] 2 < EPD1 < EPD2 < EPD3 < 9

[0273] EPD represents the angle of view (Degree) in the diagonal direction of the optical system (100), EPD1 is the size of the entrance pupil in the first mode, EPD2 is the size of the entrance pupil in the second mode, and EPD3 is the size of the entrance pupil in the third mode.

[0274] [Mathematical Equation 54] 1 < ΣCT / n < 3

[0275] [Mathematical Formula 55] 10 < ΣVd / n< 50

[0276] [Mathematical Equation 56] 1 < ΣNd / n< 2

[0277] ΣCT is the sum of the center thicknesses of the first to eleventh lenses, ΣVd is the sum of the Abbe numbers of the first to eleventh lenses, and ΣNd is the sum of the refractive indices of the first to eleventh lenses. Here, n is the total number of lenses, which can be 11. By satisfying Equations 53-55 in the folded optical system, the center thicknesses, Abbe numbers, and refractive indices of the lenses can be set to prevent degradation of optical characteristics.

[0278] [Mathematical Formula 57]

[0279]

[0280] In mathematical equation 57, Z can be Sag, which represents the distance in the direction of the optical axis from any position on the aspherical surface to the vertex of the aspherical surface. Additionally, Y can represent the distance in the direction perpendicular to the optical axis from any position on the aspherical surface to the optical axis. Furthermore, 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 aspheric constants from the 4th to the 14th order.

[0281]

[0282] The optical system (100) according to the embodiment can satisfy at least one of the above-described mathematical formulas 1 to 56. Accordingly, the optical system (100) and the camera module can have improved optical characteristics. Specifically, as the optical system (100) satisfies at least one or two of the mathematical formulas 1 to 56, it can effectively correct for optical characteristic degradation such as chromatic aberration, vignetting, diffraction effects, and peripheral image quality degradation caused by the movement of the lens group. Furthermore, the optical system (100) according to the embodiment can significantly reduce the movement distance of the lens group and provide an autofocus (AF) function for various magnifications with excellent power consumption characteristics.

[0283] Table 3 shows the result values ​​for the above-described mathematical formulas 1 to 28 in the optical system (100) of the embodiment. It can be seen that the optical system (100) satisfies at least one, two or more, or three or more of mathematical formulas 1 to 28. Accordingly, the optical system (100) can have good optical performance in the center and periphery of the field of view (FOV) and can have excellent optical characteristics.

[0284] Mathematical Value 1FLG1 < 0 -39.10021 < |L1R1| / |L2R2| < 51.454330 < F1 < 200105.7394L1R1 < 0 -43.18951 < |L1R2| / CT1 < 52.74963 < TDLG1 / TDLG2 < 158.2027CA2 < CA4 < CA5 Satisfied 8CA8 < CA7 < CA6 < CA5 Satisfied 9CA8 < CA9 < CA10 < CA11 Satisfied 10FLG5 > 06.900110 < FLG3 / Md1F < 1.50.973120 < FLG3 < |FLG2| < FLG1만만132 < TTL / TDLG1 < 53.042141 < Md1F / Md1EPD < 32.3521510 < CT1 / CT2 < 5036.025161 < CT3 / CT2 < 31.9701715 < |Vd2 - Vd1| < 4028.113180 < |Vd11 - Vd1| < 101.570191.60 < Nd11.671200.1 < CG1 < 1mm0.50021L2R1 < 0-9.149222L3R1 < 0-953.470230 < |L1R1 / L3R1| < 10.045241 < L4R2 / L5R1 < 104.408251 < |L1R1 / L11R2| < 102.948261 < Md12_mLG3 / TDLG3 < 31.756270 < Md23_mLG3 / TDLG3 < 10.222280 < Md12_mLG4 / TDLG4 < 10.282

[0285] Table 4 shows the result values ​​for the above-described mathematical formulas 29 to 56 in the optical system (100) of the embodiment. It can be seen that the optical system (100) satisfies at least one, two or more, or three or more of mathematical formulas 29 to 56. Accordingly, the optical system (100) can have good optical performance in the center and periphery of the field of view (FOV) and can have excellent optical characteristics.

[0286] 수학식값290 < Md23_mLG4 / TDLG4 < 0.50.038301 < Md13_mLG2 / TDLG2 < 32.039315 < Max_CG11 < Max_CG4 < 11만족3210 < Md1 (CG4 / CG2) < 6041.418331< Md1 (CG4 / CG7) < 52.690344 < Max_mMd13 < 118.336355 < CAS1 / CAS2 < 3021.615361 < CT1 / CAS2 < 32.16137Md3_Fno ≤ 4.03.533380.2 < BFL < 31.211390 < BFL / ImgH < 10.44405 < TTL / ImgH < 2012.963412 < ImgH2.724421 < │FLG1 / FLG2 │ < 51.470431 < Md3F / Md1F < 63.520442 < Md2F / EPD2 < 63.011451 Md1F / EPD1 < 42.352461 < CA_Max / ImgH < 43.672471 < Md1F / ImgH < 62.754484 < Md3F / ImgH < 159.693491 < Md3F / Max_mMd13 < 53.1675010 < TTL < 5035.307510 < Md1F / TTL < 10.212528 < FOV3 <FOV2 < FOV1 < 45만족533 < EPD1 < EPD2 <EPD3 < 9만족541 < ΣCT / n < 31.745510 < ΣVd / n< 5034.2561 < ΣNd / n < 21.6

[0287]

[0288] Referring to FIGS. 11 and 12, a mobile terminal is a portable device capable of various multimedia functions in addition to phone calls, and can be extended beyond the dimension of being primarily held in the hand by the user to become a wearable device that can be worn on the body. Such wearable devices include smart watches, smart glasses, and HMDs (head-mounted displays). A wearable device, such as that shown in FIG. 11, can be configured to exchange (or interact with) data with other mobile terminals. A near-field communication module can detect (or recognize) a wearable device capable of communicating in the vicinity of the mobile terminal. Furthermore, if the detected wearable device is a device authenticated to communicate with the mobile terminal, the control unit can transmit at least a portion of the data processed by the mobile terminal to the wearable device through the near-field communication module. Accordingly, the user can utilize the data processed by the mobile terminal through the wearable device. For example, when a phone call is received on a mobile terminal, it is possible to make a phone call through the wearable device, or when a message is received on a mobile terminal, it is possible to check the received message through the wearable device.

[0289] FIG. 11 is a perspective view illustrating an example of a wearable device having an optical system and a camera module of the invention. A wearable device such as FIG. 11 is composed of a frame (160) and a lens (168) having a shape similar to ordinary glasses, and an optical module (170) equipped with an output unit, an input unit, a sensing unit, etc. is not exposed to the outside as much as possible, thus having a shape similar to ordinary glasses or sunglasses. The frame (160) is composed of a front frame (161) located on the front of the user's face and a side frame (162) including a temple (162b) located on the side of the user's face and hung on the user's ear. The side frame (162) may be composed of a first side frame (162a) fixed to the front frame (161) so as not to change its angle, and a second side frame (162b) that is bent through a hinge or includes a flexible material and hangs on the upper part of the user's ear.

[0290] The front lens (168) is coupled to the frame (160) and is positioned in front of the user's eyes when the user wears the wearable device (100). The present invention configures the frame (160) and the front lens (168) to have a shape similar to ordinary glasses, and mounts an image projection device (151) and a wave guide (153) for providing images to the user on a separate optical module. In addition to the function of providing images, the optical module may also be equipped with various components such as an audio output module, the camera module disclosed above, and a sensor unit.

[0291] The optical module can be configured to be positioned in a direction adjacent to the user when the user wears the wearable device (100), so that another person cannot perceive the optical module (170) from the front. The optical module (170) is configured to be coupled to a wave guide (153) and a frame (160) located at the rear of the front lens (168) (the direction closer to the user when wearing the wearable device (100) is referred to as the rear).

[0292]

[0293] As shown in FIG. 12, this is a drawing illustrating the application to a mobile terminal having an optical system and a camera module according to an embodiment. As shown in FIG. 12, the mobile terminal (1000) is a mobile phone and includes an imaging device (1010), and the imaging device (1010) includes at least one camera module (1011, 1012, 1013). For example, one of the camera modules (1011, 1012, 1013) can perform wide-angle shooting, and the other can perform telephoto shooting. The one performing wide-angle shooting may include a camera module having an optical system of the first to fifth embodiments. Although the imaging device (1010) is illustrated as a rear camera of a smartphone, the imaging device (1010) may also be a front camera of a smartphone. In addition, although the mobile terminal (1000) is illustrated as a smartphone, it can be implemented in mobile devices such as PDAs, netbooks, tablet computers, laptop computers, etc., wearable devices such as smartwatches, smart bands, smart glasses, etc., computing devices such as desktops, servers, etc., home appliances such as televisions, smart televisions, refrigerators, etc., security devices such as door locks, CCTVs, etc., vehicles such as autonomous vehicles, smart vehicles, etc., cameras such as VR / AR cameras, 360-degree cameras, drones, etc.

[0294] Additionally, the mobile terminal (1000) may include a flash module (not shown) and an autofocus device (not shown). Here, the autofocus device (not shown) may include a surface-emitting laser element and a light receiver as a light-emitting layer. The flash module may include an emitter that emits light inside. The flash module may be operated by the operation of the camera of the electronic device or by the control of a user. The autofocus device may include an autofocus function using a laser. The autofocus device may be mainly used under conditions where the autofocus function using the image of the camera module is degraded. Additionally, although not shown in the drawings, at least one additional camera module may be disposed on the front of the mobile terminal (1000). At least one of the camera modules within the mobile terminal may have a tele-type folded lens assembly disclosed above.

[0295]

[0296] FIG. 13 is an example of a plan view of a vehicle to which a camera module or optical system according to an embodiment of the invention is applied. Referring to FIG. 13, a vehicle camera system according to an embodiment of the invention includes an image generation unit (11), a first information generation unit (12), a second information generation unit (21, 22, 23, 24, 25, 26), and a control unit (14). The image generation unit (11) may include at least one camera module (31) disposed in the vehicle and may generate a front image of the vehicle or an interior image of the vehicle by photographing the front of the vehicle and / or the driver. The image generation unit (11) may generate an image of the vehicle's surroundings by photographing the vehicle's surroundings in one or more directions as well as the front of the vehicle using the camera module (31). Here, the front image and the surrounding image may be digital images and may include color images, black and white images, and infrared images. Additionally, the front image and the surrounding image may include still images and video images. The image generation unit (11) provides the driver image, the front image, and the surrounding image to the control unit (14). Subsequently, the first information generation unit (12) may include at least one radar or / and camera placed on the vehicle and generates first detection information by detecting the front of the vehicle. Specifically, the first information generation unit (12) is placed on the vehicle and generates first detection information by detecting the position and speed of vehicles located in front of the vehicle, the presence and location of pedestrians, etc.

[0297] By using the first detection information generated by the first information generation unit (12), the distance between the vehicle and the vehicle in front can be controlled to be maintained at a constant level, and the stability of vehicle operation can be increased in specific cases that are pre-set, such as when the driver wants to change the driving lane of the vehicle or when reverse parking. The first information generation unit (12) provides the first detection information to the control unit (14). The second information generation unit (21, 22, 23, 24, 25, 26) generates second detection information by detecting each side of the vehicle based on the front image generated by the image generation unit (11) and the first detection information generated by the first information generation unit (12). Specifically, the second information generation unit (21, 22, 23, 24, 25, 26) may include at least one radar or / and camera placed on the vehicle, and may detect the position and speed of vehicles located on the side of the vehicle or capture images. Here, the second information generating unit (21, 22, 23, 24, 25, 26) can be positioned at the front corners, side mirrors, and rear center and rear corners of the vehicle, respectively.

[0298] At least one information generating unit among such vehicle camera systems may be equipped with an optical system and a camera module having the same as described in the embodiment(s) disclosed above, and may provide to or process information obtained through the front, rear, each side, or corner area of ​​the vehicle to protect the vehicle and objects from autonomous driving or surrounding safety.

[0299] The optical system of the camera module according to an embodiment of the invention can be mounted in multiple units within a vehicle to comply with safety regulations, enhance autonomous driving functions, and increase convenience. Furthermore, the optical system of the camera module is applied within the vehicle as a component for control, such as a Lane Keeping Assistance System (LKAS), Lane Departure Warning System (LDWS), and Driver Monitoring System (DMS). Such a vehicle camera module can achieve stable optical performance even with changes in ambient temperature and provides a cost-competitive module, thereby ensuring the reliability of vehicle components.

[0300] 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 those 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. Although the above description has focused on embodiments, this is merely an example and does not limit the present invention; those skilled in the art to which the present invention belongs will understand that various modifications and applications not exemplified above are possible within the scope that does not deviate from the essential characteristics of the embodiments. For example, each component specifically shown in the embodiments may be modified and implemented. Furthermore, differences related to such modifications and applications should be interpreted as being included within the scope of the present invention as defined in the appended claims.

Claims

A first lens having a reflective surface and refractive power that reflects light incident on the first optical axis toward the second optical axis; and It includes second to eleven lenses disposed between the first lens and the image sensor and sequentially aligned along the second optical axis, The first lens comprises an object-side surface concave on the first optical axis and a sensor-side surface convex on the second optical axis, An optical system in which the third to tenth lenses move along the second optical axis in groups of two or three lenses depending on the operating mode. In Article 1, The second lens has a concave object-side surface and a convex sensor-side surface on the second optical axis, and The above second lens is an optical system having negative refractive power. In Article 1, The above 11th lens has an object-side surface convex on the second optical axis and a sensor-side surface convex on the second optical axis, and The above 11th lens is an optical system having positive refractive power. In Article 1, An optical system in which the first lens and the fifth lens have positive refractive power. In any one of paragraphs 1 to 4, In wide mode, the focal length of the above optical system is Md1F, and The total length along the first and second optical axes of the above optical system is TTL, and Mathematical formula: 0 < Md1F / TTL < 1 An optical system satisfying . In Article 1, An optical system comprising an aperture disposed around the perimeter between the sensor side of the fourth lens and the object side of the fifth lens. In any one of paragraphs 1 through 6, The above first and second lenses are a first lens group, and The above third and fourth lenses are a second lens group, and The above 5th, 6th, and 7th lenses are the 3rd lens group, and The above 8th, 9th, and 10th lenses are the 4th lens group, and The above 11th lens is a 5th lens group, and An optical system in which the second to fourth lens groups each move along the second optical axis according to the operation mode. In Article 7, The above-mentioned first lens group is an optical system having negative refractive power. In any one of paragraphs 1 through 6, The average effective lengths of the object side and sensor side of the above 2nd, 4th, and 5th lenses are CA2, CA4, and CA5, respectively. Mathematical formula: CA2 < CA4 < CA5 An optical system satisfying In Article 9, The average effective length of the object side surface and the sensor side surface of the 5th to 8th lenses is CA5 to CA8, and Mathematical formula: CA8 < CA7 < CA6 < CA5 An optical system satisfying In Article 10, The average effective length of the object side surface and the sensor side surface of the 8th to 11th lenses is CA8 to CA11, and Mathematical formula: CA8 < CA9 < CA10 < CA11 An optical system satisfying Image sensor; and It includes an optical system disposed on the image sensor above, The above optical system is a camera module having any one of claims 1 to 6.

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