Optical system and camera module

Abstract

A camera module disclosed in an embodiment of the present invention includes: a first lens group having first to fourth lenses; a second lens group having a fifth lens and a sixth lens; a third lens group having a seventh lens and an eighth lens; a fourth lens group having a ninth lens, wherein the first to ninth lenses are aligned along the optical axis from an object toward an image sensor, the first to fourth lenses have a meniscus shape convex toward the object, and at least one of the second lens group and the third lens group is movable along the optical axis.

Description

Optical system and camera module

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

[0002] Camera modules perform the function of capturing objects and storing them as images or videos, and are installed in various applications. In particular, camera modules are manufactured in an ultra-small size and are applied to portable devices such as smartphones, tablet PCs, and laptops, as well as drones and vehicles, providing various 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. At this time, the camera module can perform an autofocus (AF) function that automatically adjusts the distance between the image sensor and the imaging lens to align the focal length of the lens, and can perform a zooming function that increases or decreases the magnification of a distant object through a zoom lens. In addition, the camera module adopts image stabilization (IS) technology to compensate for or prevent shaking of the image caused by camera movement due to an unstable fixed device or the user's 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 is being conducted on optical systems that include multiple lenses 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 and aberration characteristics. In addition, when multiple lenses are included, the overall length, height, etc. may increase due to the thickness, spacing, size, etc. of the multiple lenses, which increases the overall size of the module that includes the multiple lenses.

[0004] To achieve high-resolution and high-quality images, image sensors are increasing in size. However, as image sensors increase in size, the total track length (TTL) of optical systems containing multiple lenses also increases, leading to an increase in the thickness of cameras, mobile devices, and other devices containing the optical systems.

[0005] When the optical system includes a plurality of lenses, the position of at least one lens or a lens group including at least one lens can be controlled to perform functions such as zoom and autofocus (AF). However, when the lens or the lens group performs the function, the amount of movement of the lens or the lens group can increase exponentially. Accordingly, the optical system has a problem in that a lot of energy may be required to move the lens or the lens group, and a large volume is required considering the amount of movement. In addition, there is a problem in that aberration characteristics are deteriorated due to the movement of the lens or the lens group. Accordingly, there is a problem in that optical characteristics are deteriorated at a certain magnification when performing the zoom and autofocus (AF) functions. Therefore, a new optical system that can solve the above-described problems is required.

[0006] The present invention provides an optical system with improved optical characteristics. The present invention provides an optical system and camera module capable of photographing at various magnifications. The present invention provides an optical system and camera module with improved aberration characteristics at various magnifications. The present invention provides an optical system and camera module that can be implemented in a small and compact manner.

[0007] A camera module according to an embodiment of the invention comprises a first lens group having first to fourth lenses; a second lens group having fifth and sixth lenses; a third lens group having seventh and eighth lenses; and a fourth lens group having a ninth lens, wherein the first to ninth lenses are aligned along an optical axis from an object toward an image sensor, the first to fourth lenses have a convex meniscus shape toward the object, and at least one of the second lens group and the third lens group is movable along the optical axis.

[0008] According to an embodiment of the invention, the first lens and the second lens may have positive (+) refractive power, and the third lens and the fourth lens may have negative (-) refractive power.

[0009] According to an embodiment of the invention, the sum of the central thicknesses of the fifth lens and the sixth lens may be greater than the sum of the central thicknesses of the first lens to the fourth lens.

[0010] According to an embodiment of the invention, the first and third lens groups may have negative (-) power.

[0011] According to an embodiment of the invention, the second and fourth lens groups may have positive (+) power.

[0012] According to an embodiment of the invention, the second and third lens groups move along the optical axis to perform a zoom magnification from a wide mode to a tele mode, and the maximum movement distance of the second or third lens group according to the zoom magnification is Max_mMd13, and can satisfy the mathematical formula: 1 mm < Max_mMd13 < 7 mm.

[0013] According to an embodiment of the invention, the minimum optical axis distance between the first lens group and the second lens group according to the tele mode is Md3_DG12, and can satisfy the mathematical formula: 1.0mm ≤Md3_DG12 < 1.5mm.

[0014] According to an embodiment of the invention, the radius of curvature of the object-side surface of the first lens closest to the object in the first lens group is L1R1, and the radius of curvature of the sensor-side surface is L1R2, and the mathematical formula: L1R1 < L1R2 can be satisfied.

[0015] According to an embodiment of the invention, at least one of the radius of curvature of the object-side surface and the sensor-side surface of the third lens may be 50 mm or greater.

[0016] According to an embodiment of the invention, the effective length of the first lens in the first direction is CA1x, the effective length in the second direction is CA1y, and the mathematical formula: 0.55 < CA1y / CA1x < 0.98 can be satisfied.

[0017] A camera module according to an embodiment of the invention comprises: a first lens group having three or more lenses; a second lens group disposed on a sensor side of the first lens group and having two or fewer lenses; a third lens group disposed on a sensor side of the second lens group and having two or fewer lenses; And a fourth lens group disposed on the sensor side of the third lens group and having two or fewer lenses, wherein the lenses of the first to fourth lens groups are aligned from the object toward the image sensor along the optical axis, the first lens group and the third lens group have negative (-) power, the lens having the largest absolute value of refractive power in the first to fourth lens groups is disposed in the first lens group, the lens having the largest central thickness in the first to fourth lens groups is disposed in the second lens group, the lens having the maximum effective length in the first to fourth lens groups has different effective lengths in the first and second directions passing through the centers of the object-side surface and the sensor-side surface, the lens having the maximum effective length in the first to fourth lens groups has different effective lengths in the first and second directions passing through the centers of the object-side surface and the sensor-side surface, and among the lenses of the first to fourth lens groups, there are two or more lenses having different effective lengths in the first and second directions of the object-side surface or the sensor-side surface. It can have a maximum effective length of 5.2 mm or more.

[0018] According to an embodiment of the invention, the number of lenses in the first lens group is at least twice that of the number of lenses in the second lens group, and may have a convex meniscus shape toward the object.

[0019] According to an embodiment of the invention, the number of lenses in the first lens group may be at least three times the number of lenses in the fourth lens group.

[0020] According to an embodiment of the invention, an aperture is provided on a periphery between the first lens group and the second lens group, and the aperture has a position that can be changed along the optical axis direction within the camera module.

[0021] According to an embodiment of the invention, the second lens group and the third lens group can be moved along the optical axis direction.

[0022] According to an embodiment of the invention, the positions of the first lens group and the fourth lens group can be fixed.

[0023] According to an embodiment of the invention, the optical axis distance of the first lens group is DLG1, the optical axis distance of the second lens group is DLG2, and the optical axis distance of the third lens group is DLG3, and the mathematical formulas: 1 < DLG1 / DLG2 < 1.5 and 0.5 < DLG2 / DLG3 < 1.5 can be satisfied.

[0024] According to an embodiment of the invention, among the lenses, the refractive index of the first lens closest to the object is Nd1, the Abbe number is Vd1, the refractive index of the last lens closest to the image sensor is Ndn, the Abbe number is Vdn, and the mathematical formulas: 20 < Nd1*Vd1 < 50 and 20 < Ndn*Vdn < 50 can be satisfied.

[0025] According to an embodiment of the invention, the first lens group includes a reflective member arranged on the object side, and the reflective member can reflect light incident from the object side to the object-side surface of the first lens group.

[0026] According to an embodiment of the invention, the number of lenses in the fourth lens group is one, the camera module has nine lenses, and the lens closest to the image sensor in the camera module may have a meniscus shape convex toward the sensor side on the optical axis.

[0027] According to an embodiment of the invention, the second and third lens groups move along the optical axes of the lenses in the first to fourth lens groups to perform a zoom magnification from a wide mode to a tele mode, and the maximum movement distance of the second lens group according to the zoom magnification is Max_mLG2, the maximum movement distance of the third lens group according to the zoom magnification is Max_mLG3, the optical axis distance from the object-side first lens of the first lens group to the surface of the image sensor is TTL, and 1 / 2 of the diagonal length of the image sensor is ImgH, and the mathematical expressions: 5 < TTL / Max_mLG2 < 5.6, 5 < TTL / Max_mLG3 < 5.6, 5 < TTL / ImgH < 12 can be satisfied.

[0028] An optical system and a camera module according to an embodiment can have various magnifications and can have excellent optical characteristics when providing various magnifications. Specifically, the embodiment can have various magnifications by controlling the movement distance of each moving lens group and can provide an autofocus (AF) function for a subject. The optical system and camera module according to an embodiment can have multiple lens groups correct aberration characteristics or mutually complement aberration characteristics that change due to movement. Accordingly, the optical system according to the embodiment can minimize or prevent changes in chromatic aberration and aberration characteristics that occur when the magnification changes.

[0029] An optical system and a camera module according to an embodiment can control an effective focal length (EFL) by moving only some lens groups among a plurality of lens groups, and can minimize a moving distance of the moving lens group. Accordingly, the optical system can reduce a moving distance of the moving lens group according to a change in the operation mode, and can minimize power consumption required when the lens group is moved. In the optical system, at least one lens included in a fixed group and a moving group can have a non-circular shape. Accordingly, the optical system can reduce the height of the optical system while maintaining optical performance, and can secure a space for structurally arranging lens groups arranged between the plurality of lens groups.

[0030] The optical system and camera module according to the embodiment can adjust magnification by moving a lens group other than the first lens group adjacent to the subject among the plurality of lens groups. Accordingly, the optical system can maintain a constant TTL value even when the lens group moves according to the change in magnification. Accordingly, the optical system and the camera module including the optical system can be provided with a slimmer structure.

[0031] FIG. 1 is a configuration diagram of an optical system and a camera module having the same according to a first embodiment of the invention.

[0032] Fig. 2 is an example of the operation of the first mode of the optical system of Fig. 1.

[0033] Figure 3 is an example of the operation of the third mode in the optical system of Figures 1 and 2.

[0034] Figure 4 is a table of lens data of an optical system according to a first embodiment of the invention.

[0035] FIG. 5 is a table showing aspherical coefficients of lenses of an optical system according to a first embodiment of the invention.

[0036] FIG. 6 is a graph of diffraction MTF in an optical system of wide, middle, and tele modes according to a first embodiment of the invention.

[0037] Fig. 7 is a graph showing the aberration characteristics in the optical system of the first mode of Fig. 2.

[0038] Fig. 8 is a graph showing the aberration characteristics in the optical system of the second mode (Mid mode) of Fig. 1.

[0039] Fig. 9 is a graph showing the aberration characteristics in the optical system of the third mode (tele mode) of Fig. 3.

[0040] Fig. 10 is a configuration diagram of an optical system and a camera module having the same according to a second embodiment of the invention.

[0041] Fig. 11 is an example of the operation of the first mode of the optical system of Fig. 10.

[0042] Fig. 12 is an example of operation of the third mode in the optical system of Figs. 10 and 11.

[0043] Fig. 13 is a table of lens data of an optical system according to a second embodiment of the invention.

[0044] Fig. 14 is a table showing aspherical coefficients of lenses of an optical system according to a second embodiment of the invention.

[0045] FIG. 15 is a graph of diffraction MTF in an optical system of wide, mid, and tele modes according to a second embodiment of the invention.

[0046] Fig. 16 is a graph showing the aberration characteristics in the optical system of the first mode of Fig. 11.

[0047] Fig. 17 is a graph showing the aberration characteristics in the optical system of the second mode (Mid mode) of Fig. 10.

[0048] Fig. 18 is a graph showing the aberration characteristics in the optical system of the third mode (tele mode) of Fig. 12.

[0049] FIG. 19 is a configuration diagram of an optical system and a camera module having the same according to a third embodiment of the invention.

[0050] Fig. 20 is an example of a change in the first mode of the optical system of Fig. 19.

[0051] Fig. 21 is an example of a change in the third mode in the optical system of Figs. 19 and 20.

[0052] Fig. 22 is a table of lens data of an optical system according to a third embodiment of the invention.

[0053] Fig. 23 is a table showing aspherical coefficients of lenses of an optical system according to a third embodiment of the invention.

[0054] FIG. 24 is a graph of diffraction MTF in an optical system of wide, middle, and tele modes according to a third embodiment of the invention.

[0055] Fig. 25 is a graph showing the aberration characteristics in the optical system of the first mode of Fig. 20.

[0056] Fig. 26 is a graph showing the aberration characteristics in the optical system of the second mode (Mid mode) of Fig. 19.

[0057] Fig. 27 is a graph showing the aberration characteristics in the optical system of the third mode (tele mode) of Fig. 21.

[0058] FIG. 28 is an example of a side cross-sectional view of an optical system and a camera module having a reflective member in the first, second, and third embodiments of the invention.

[0059] FIG. 29 is a drawing showing a camera module according to embodiments of the invention applied to a mobile terminal.

[0060] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. However, the technical idea of ​​the present invention is not limited to some of the embodiments described, but can be implemented in various different forms, and one or more of the components between the embodiments can be selectively combined or substituted within the scope of the technical idea of ​​the present invention. In addition, terms (including technical and scientific terms) used in the embodiments of the present invention can be interpreted as having a meaning that can be generally understood by a person having ordinary skill in the technical field to which the present invention pertains, unless explicitly and specifically defined and described, and terms commonly used, such as terms defined in a dictionary, can be interpreted in consideration of the contextual meaning of the related technology. The terminology used in the embodiments of the present invention is for the purpose of describing the embodiments and is not intended to limit the present invention.

[0061] In this specification, the singular may also include the plural unless specifically stated in the phrase, and when it is described as “A and (or at least one (or more) of B, C,” it may include one or more of all combinations that can be combined with A, B, and C. In addition, when describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the components from other components, and are not limited by the nature, order, or sequence of the components. In addition, when it is described that a component is “connected,” “coupled,” or “connected” to another component, it may include not only cases where the component is directly connected, coupled, or connected to the other component, but also cases where the component is “connected,” “coupled,” or “connected” by another component between the component and the other component.

[0062] When it is described in the specification that each component is formed or arranged "above or below", above or below includes not only cases where the two components are in direct contact with each other, but also cases where one or more other components are formed or arranged between the two components. In addition, when expressed as "above or below", it can include the meaning of the downward direction as well as the upward direction based on one component.

[0063] In the specification, the convexity of the lens surface may mean that the lens surface in the area corresponding to the optical axis or the paraxial area has a convex shape based on the optical axis, and the concaveness of the lens surface may mean that the lens surface in the area corresponding to the optical axis or the paraxial area has a concave shape. In addition, the "object-side surface" may mean the surface of the lens facing the object side based on the optical axis, and the "sensor-side surface" may mean the surface of the lens facing the imaging surface (image sensor) based on the optical axis. In addition, the center thickness of the lens may mean the thickness of the lens in the optical axis direction. In addition, 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 area of ​​the lens through which incident light passes. In addition, 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.

[0064]

[0065] As shown in FIGS. 1, 10, and 19, the optical system (1000) 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. The lens groups may include a first lens group (LG1) adjacent to an object, a last lens group adjacent to an image sensor (300), and one or more lens groups between the first lens group (LG1) and the last lens group. Each of the plurality of lens groups includes at least one lens.

[0066] The above plurality of lens groups include first to fourth lens groups (LG1-LG4), and the first to fourth lens groups (LG1-LG4) can be sequentially arranged along the optical axis (OA) from the object toward the image sensor (300). The optical system (1000) can include n lenses, the nth lens is the last lens, and n is an integer greater than or equal to 8, for example, 8 to 10. Within the optical system (1000), the lenses can be defined as lens units (100, 100A, 100B).

[0067] Among the plurality of lens groups, lens groups having the largest optical axis distance are fixed groups with fixed positions, and lens groups between the fixed lens groups may be variable groups with variable positions. For example, the first lens group (LG1) adjacent to the object and the fourth lens group (LG4) adjacent to the image sensor (300) may be fixed groups, and the lens group (LG2, LG3) between the first and fourth lens groups (LG1, LG4) may be a variable group with variable positions. Here, the variable group may be moved in the optical axis direction or restored to its original position. By the lens group that moves, the optical system (1000) may provide a continuous zoom optical system having a wide mode, a middle mode, and a tele mode.

[0068] The maximum movement distance of the above-described moving lens groups may be less than 5.7 mm. Accordingly, the power consumption of the driving unit for moving the lens groups may be reduced. In addition, in tele mode, the optical axis distance (DG12) between the first and second lens groups (LG1, LG2) may be 1 mm or more, for example, greater than 1 mm. Accordingly, the movement distance of the second and third lens groups (LG2, LG3) is reduced, thereby providing a high-magnification optical system.

[0069]

[0070] The number of lenses of each of the first lens group (LG1) and the second lens group (LG2) may be different. The number of lenses of the first lens group (LG1) may be greater than the number of lenses of the second lens group (LG2). The number of lenses of the first lens group (LG1) may be 1.5 times or more or 2 times or more than the number of lenses of the second lens group (LG2). The number of lenses of each of the second lens group (LG2) and the third lens group (LG3) may be the same or different, and may be, for example, 2 or less. For example, the number of lenses of the third lens group (LG3) may be the same as the number of lenses of the second lens group (LG2). If the number of lenses of each of the second lens group (LG2) and the third lens group (LG3) exceeds 3, power consumption due to movement in the optical axis direction may increase.

[0071] The number of lenses of the fourth lens group (LG4) may be smaller than the number of lenses of each of the second lens group (LG2) and the third lens group (LG3). The number of lenses of the fourth lens group (LG4) may be the smallest among the lens groups. The number of lenses of the first lens group (LG1) may be three or more times the number of lenses of the fourth lens group (LG4). The number of lenses of the fourth lens group (LG4) may be two or less, for example, one. The number of lenses of the first lens group (LG1) may be three or more times the number of lenses of the fourth lens group (LG4). By stacking these lens numbers, an optical system of a wide mode, a middle mode, and a tele mode can be provided, and a bright optical system with an F number in the range of 2.8 to 4.5 can be provided depending on the operation mode.

[0072]

[0073] At least one or all of the lenses of the first to fourth lens groups (LG1-LG4) may be made of plastic. In addition, the lenses in the movable lens groups (LG2, LG3) may be arranged of plastic to prevent an increase in power consumption of the driving member. As another example, each of the movable lens groups (LG2, LG3) may include a plastic lens and a glass lens. As another example, among the lenses of the first lens group (LG1) that is fixed in position, the lens closest to the object may be made of glass. As another example, the lens in the lens group closest to the image sensor (300) may be made of glass. At least one or all of the lens surfaces of the lenses of the first to fourth lens groups (LG1-LG4) may have an aspherical shape on the optical axis. The lenses having the above aspherical surface can prevent spherical aberration within the optical system (1000), and since aberration does not occur even when the effective diameter is increased, the camera module can be made smaller and lighter. The above aspherical lens can be made of glass mold or plastic material.

[0074]

[0075] The power of the first lens group (LG1) may have a sign opposite to that of the power of the second lens group (LG2). The power of the first lens group (LG1) may be negative, and the power of the second lens group (LG2) may be positive. The power of the third lens group (LG3) may have a sign opposite to that of the power of the fourth lens group (LG4). The power of the third lens group (LG3) may be negative, and the power of the fourth lens group (LG4) may be positive. Among the lenses in the optical system (10000), the number of lenses having positive power may be greater than the number of lenses having negative power.

[0076] The focal length of the first lens group (LG1) is FLG1, the focal length of the second lens group (LG2) is FLG2, and the condition: FLG2 < │FLG1│ can be satisfied. The focal length of the third lens group (LG3) is FLG3, and the focal length of the fourth lens group (LG4) is FLG4, and the condition: │FLG3│ < FLG4 can be satisfied. The absolute value of the focal length of the first and fourth lens groups (LG1, LG4) whose positions are fixed can be greater than the absolute value of the focal length of the second and third lens groups (LG2, LG3) that are moved. The angle of view (FOV) can be adjusted by the power of the first to fourth lens groups (LG1-LG4).

[0077] In the first lens group (LG1), the first lens (101, 111, 121) closest to the object and the lens closest to the second lens group (LG2) may have opposite refractive powers. Accordingly, the first lens group (LG1) may mutually compensate for chromatic aberrations caused by the plurality of lenses included in the first lens group (LG1). For example, the first lens (101, 111, 121) may have positive power, and the fourth lens (104, 114, 124) may have negative power. Here, the Abbe number (LG1_Vd4) of the last lens of the first lens group (LG1) may satisfy the following condition: LG1_Vd4 < 35, for example, 20 < LG1_Vd4 < 35. Under these conditions, the first lens group (LG1) can disperse the incident light to the periphery of the second lens group (LG2).

[0078]

[0079] The Abbe number (LG2_Vd1) of a lens close to the first lens group (LG1) within the second lens group (LG2) can satisfy the condition: 35 < LG2_Vd1, for example, 35 < LG2_Vd1 < 70. By this condition, the second lens group (LG2) can refract incident light in the direction of the optical axis of the third lens group (LG3).

[0080] At least two lenses in the second lens group (LG2) may have opposite refractive powers. Accordingly, the second lens group (LG2) may mutually compensate for chromatic aberrations caused by a plurality of lenses included in the second lens group (LG2). When the Abbe numbers of at least two lenses in the second lens group (LG2) are LG2_Vd1 and LG2_Vd2, the condition: 20 < │LG2_Vd1-LG2_Vd2│ may be satisfied, and when the condition is satisfied, the change in chromatic aberration due to magnification adjustment (Zooming) may be minimized.

[0081] At least two lenses in the third lens group (LG3) may have opposite refractive powers. Accordingly, the third lens group (LG3) may mutually compensate for chromatic aberrations caused by a plurality of lenses included in the third lens group (LG3). When the Abbe numbers of at least two lenses in the third lens group (LG3) are LG3_Vd1 and LG3_Vd2, the condition: 20 < │LG3_Vd1 - LG3_Vd2│ may be satisfied, and when the condition is satisfied, the change in chromatic aberration due to aberration correction may be minimized.

[0082] The refractive index (LG4_Nd) of the lenses in the fourth lens group (LG4) can satisfy the following condition: 1.6 < LG4_Nd1, for example, 1.6 < LG4_Nd1 < 1.8. According to this condition, the lenses of the fourth lens group (LG4) can refract incident light toward the center and periphery of the image sensor (300). The fourth lens group (LG4) can play a role of controlling the chief ray angle (CRA). In detail, the CRA of the optical system (1000) according to the embodiment can be less than about 10 degrees, and the last ninth lens (109, 119, 129) can correct the chief ray angle (CRA) of the light incident on the image sensor (300) to be close to 0 degrees. The CRA of the optical system (1000) can satisfy the condition: 0 < CRA < 9 degrees.

[0083]

[0084] When the sum of the refractive indices of the lenses in the above optical system (1000) is ΣNd and the sum of the Abbe numbers is ΣVd, the following conditions can be satisfied.

[0085] Condition 1: 12 < ΣNd < 16

[0086] Condition 2: 250 < ΣVd < 300

[0087] By adjusting the refractive index and Abbe number of the lenses within the optical system (1000), aberration can be controlled. Among the lenses within the optical system (1000), the lens with the maximum Abbe number can be positioned in the second and third lens groups (LG2 and LG3). The lens with the maximum Abbe number can reduce chromatic dispersion, and the lens with a refractive index exceeding 1.6 can increase chromatic dispersion of incident light.

[0088] Each of the lenses may have a surface closer to the object than the image sensor (300) as the object-side surface, and a surface closer to the image sensor (300) than the object may be the sensor-side surface. These object-side surfaces and sensor-side surfaces are effective areas of each lens. Each of the lenses of the optical system (1000) may include an effective area and an ineffective area. The effective area may be an area through which light incident on each of the lenses passes. That is, the effective area may be defined as an effective area or effective diameter through which the incident light is refracted to implement optical characteristics. The ineffective area may be arranged around the periphery of the effective area. The ineffective area may be an area through which effective light is not incident from the plurality of lenses. That is, the ineffective area may be an area unrelated to the optical characteristics. In addition, an end of the ineffective area may be an area fixed to a lens barrel (not shown) that accommodates the lens.

[0089]

[0090] The average effective length of the object-side surface and the sensor-side surface of each lens of the lens unit (100, 100A, 100B) may be provided as 7 mm or less, for example, in the range of 4 mm to 7 mm. Here, the average effective length may be the average of the effective length or the maximum effective length of the object-side surface and the sensor-side surface of each lens. In the first lens group (LG1), the maximum effective length of the object-side surface (S1) of the first lens (101, 111, 121) may be provided to be greater than the maximum effective length of the sensor-side surface (S6) of the last lens (103, 113, 123). Accordingly, the amount of light incident through the first lens (101, 111, 121) may be increased. The difference between the maximum effective length and the minimum effective length among the lenses may be less than 3 mm, so that the difference in the opening in the lens barrel may be reduced.

[0091] At least one or two or more lenses in the optical system (1000) may have different effective lengths in the first direction (X) and the second direction (Y) perpendicular to the optical axis (OA). The maximum effective length of the lenses having different effective lengths in the first direction (X) and the second direction (Y) may be 5.2 mm or more, for example, 5.3 mm or more. The first and second directions (X, Y) may pass through the center of the lens surface and be orthogonal to each other. A non-circular lens may have a shape in which the effective lengths in the first and second directions (X, Y) passing through the center of the lens are different, and for example, the effective length in the second direction (Y) passing through the center of the lens may be shorter than the effective length in the first direction (X). The second direction (Y) may be a direction perpendicular to the thickness direction or the display surface of a device having a camera module, for example, a portable terminal.

[0092] At least one of the lenses of the first lens group (LG1) may have different effective lengths on the object-side surface and / or the sensor-side surface, for example, the effective length in the second direction (Y) may be smaller than the effective length in the first direction (X). At least one of the lenses of the second lens group (LG2) may have different effective lengths on the object-side surface and / or the sensor-side surface, for example, the effective length in the second direction (Y) may be smaller than the effective length in the first direction (X). The lenses of the fourth lens group (LG4) may have different effective lengths on the object-side surface and / or the sensor-side surface, for example, the effective length in the second direction (Y) may be smaller than the effective length in the first direction (X).

[0093] In detail, among the lenses in the lens unit (100, 100A, 100B), the first lens (101, 111, 121) having the largest effective length may have an effective length in the first direction (X) that is greater than an effective length in the second direction (Y). The second lens (102, 112, 122) may have an effective length in the first direction (X) that is greater than an effective length in the second direction (Y). The fourth lens (104, 114, 124) may have an effective length in the first direction (X) that is greater than an effective length in the second direction (Y). The eighth lens (108, 118, 128) may have an effective length in the first direction (X) that is greater than an effective length in the second direction (Y).

[0094] When the lengths of the first and second directions (X, Y) of the object-side surface (CAm1) of the m-th lens are different, the maximum effective length in the first direction (X) is CAm1x, and the minimum effective length in the second direction (Y) is CAm1y, then the condition of the formula: 0.55 < CAm1y / CAm1x < 0.98 can be satisfied, and m can be 1, 2, 9, or 1, 2, 5, 6, 9. When the lengths of the first and second directions (X, Y) of the sensor-side surface (CAm2) of the m-th lens are different, the maximum effective length in the first direction (X) is CAm2x, and the minimum effective length in the second direction (Y) is CAm2y, then the condition of the formula: 0.55 < CAm2y / CAm2x < 0.98 can be satisfied, and m can be 1, 5, 9. If the value of the formula in the effective length of the object-side or sensor-side surface of the m-th lens is less than 0.55, it is difficult to manufacture the object-side or sensor-side surface of the m-th lens in a non-circular shape and it is difficult to control the distribution of the incident light, and if it exceeds 0.98, the size reduction in the second direction of the optical system may be minimal.

[0095] When the maximum effective length in the second direction (Y) among the lenses in the optical system (1000) is Max_CAy, it can satisfy Max_CAy < 6.5 mm or Max_CAy ≤ 6.2 mm. That is, by limiting the maximum effective length in the second direction (Y) of each lens surface to the above range, an increase in the thickness of a mobile terminal equipped with a camera module can be prevented.

[0096]

[0097] An optical system (1000) according to an embodiment can have improved assembly properties by non-circular lens(es) and a mechanically stable shape. In addition, the optical system (1000) can significantly reduce the moving distance of a moving lens group and provide various magnifications. In addition, since lenses having a large effective length in the second direction (Y) are provided in a shape in which both sides in the second direction (Y) are cut off, the height or thickness of the optical system (1000) and the camera module in the second direction (Y) can be reduced. Accordingly, an increase in the thickness of a device having a slim optical system (1000) and a camera module can be suppressed.

[0098] In addition, the 35mm equivalent focal length from wide mode to tele mode in the optical system (1000) can be in the range of 80mm to 250mm, for example, in the range of 96mm to 198mm, thereby providing a high magnification and high resolution zoom lens optical system. Here, the 35mm equivalent focal length in tele mode can be 150mm or more, for example, 170mm or more.

[0099]

[0100] Within the optical system (1000), the TTL (Total top length) may be more than 4 times the ImgH, and preferably, the conditions of 4 < TTL / ImgH < 15 or 6 < TTL / ImgH < 11 may be satisfied. The TTL is the distance from the center of the object-side surface (S1) of the first lens (101, 111, 121) to the upper surface of the image sensor (300) on the optical axis (OA). The ImgH is half of the maximum diagonal length of the effective area of ​​the image sensor (300). Within the optical system (1000), the effective focal length (EFL) is more than 10 mm and the diagonal field of view (FOV) is less than 45 degrees, so that it can be provided as a zoom optical system of a mobile terminal. Accordingly, the camera module can provide a high-resolution and high-magnification zoom optical system.

[0101] The number of lenses having an effective length greater than the maximum effective length of the image sensor (300) within the lens unit (100, 100A, 100B) is less than 50%, and may range from 0% to 30%, for example. The effective length of the first lens (101, 111, 121) within the lens unit (100, 100A, 100B) may be greater than the effective length of the lens (109, 119, 129) closest to the image sensor (300). By controlling the effective diameter size of each of the lenses, the optical system (1000) can control the incident light to compensate for the deterioration of optical characteristics due to resolution and temperature change, and can improve chromatic aberration control characteristics. Here, the effective length of each lens is the average of the effective lengths of the object-side surface and the sensor-side surface in the first direction (X).

[0102] The optical system (100, 100A, 100B) may include an aperture (ST). The aperture (ST) may control the amount of light incident on the optical system (1000). The aperture (ST) may be positioned between any two lenses within the lens unit (100, 100A, 100B). In the lenses positioned between an object and the aperture (ST), the effective diameter of the lens tends to decrease as it moves from the object side to the aperture (ST).

[0103] The above aperture (ST) can be positioned at a set position. The aperture (ST) can be positioned around the object-side surface or the sensor-side surface of one of the lenses of the first and second lens groups (LG1, LG2). For example, the aperture (ST) can be positioned around the object-side surface of the second lens group (LG2). As another example, the aperture (ST) can be positioned around the sensor-side surface of the first lens group (LG1). The aperture (ST) can be a portion coated on the surface of at least one selected lens that functions as an aperture. In detail, the object-side surface or the sensor-side surface of one lens selected from among the lenses of the optical system (1000) can function as an aperture that controls the amount of light.

[0104] The above aperture (ST) may be arranged between the first lens group (LG1) and the second lens group (LG2). The aperture (ST) may be arranged between the fourth lens (104, 114, 124) and the fifth lens (105, 115, 125). The effective lengths of the fourth lens (104, 114, 124) arranged on the object side of the aperture (ST) and the fifth lens (105, 115, 125) arranged on the sensor side may be smaller than the diagonal length of the image sensor (300). Accordingly, the brightness of the optical system can be controlled. The optical axis distance between the aperture (ST) and the image sensor (300) is SD, and the value of the SD may vary depending on the movement of the second lens group (LG2).

[0105]

[0106] Based on the optical axis (OA), the first lens group (LG1) and the second lens group (LG2) may have a set interval (DG12). The optical axis interval (DG12) between the first lens group (LG1) and the second lens group (LG2) on the optical axis (OA) may be the optical axis interval between the sensor-side surface of the lens closest to the sensor among the lenses in the first lens group (LG1) and the object-side surface of the lens closest to the object among the lenses in the second lens group (LG2).

[0107] The optical axis distance (DG12) between the first lens group (LG1) and the second lens group (LG2) may be at least 1 mm. That is, in the tele mode, 1 mm ≤ DG12 may be satisfied. Here, among the lens surfaces of the first lens group (LG1) and the second lens group (LG2), two surfaces facing each other may have a concave shape on the optical axis (OA) on the sensor side of the first lens group (LG1) and a convex shape on the object side of the second lens group (LG2). The first lens group (LG1) and the second lens group (LG2) may refract light emitted through the sensor side surface of the first lens group (LG1) to the object side surface of the second lens group (LG2) depending on the operation mode. In contrast, the sensor-side surface of the first lens group (LG1) on the optical axis (OA) may have a convex shape and the object-side surface of the second lens group (LG2) may have a concave shape.

[0108]

[0109] The sum of the central thicknesses of the lenses of the lens units (100, 100A, 100B) of the embodiment may be 16 mm or less, for example, in the range of 8 mm to 16 mm or in the range of 9 mm to 13 mm. The sum of the central spacings between the lenses on the optical axis (OA) may be 11 mm or more, for example, in the range of 11 mm to 20 mm, and may be greater than the sum of the central thicknesses of the lenses. The sum of the central thicknesses of the lenses of the lens units (100, 100A, 100B) of the embodiment is ΣCT, and when the sum of the central spacings between the lenses is ΣCG, ΣCT < ΣCG can be satisfied. When the central spacings between the lenses are made larger than the central thicknesses of the lenses, the weight of the lenses of the moving group can be reduced, and an increase in power consumption by the driving member can be prevented.

[0110] The optical system (1000) or camera module may include an image sensor (300). The image sensor (300) may detect light and convert it into an electrical signal. The image sensor (300) may detect light that sequentially passes through the lens units (100, 100A, 100B). The image sensor (300) may include an element capable of detecting incident light, such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor). The optical system (1000) or camera module may include an optical filter (500). The optical filter (500) may be disposed between the fourth lens group (LG4) and the image sensor (300). The optical filter (500) may be placed between the lens closest to the sensor side among the lenses of the lens unit (100, 100A, 100B) and the image sensor (300). For example, the optical system (100, 100A, 100B) may be placed between the last lens and the image sensor (300). A cover glass (not shown) is placed between the optical filter (500) and the image sensor (300), and may protect the upper portion of the image sensor (192) and prevent a decrease in the reliability of the image sensor (192). The cover glass may be removed.

[0111] The optical filter (500) may include an infrared filter or an infrared cut-off filter (IR cut-off). The optical filter (500) may allow light of a set wavelength band to pass through and filter out light of a different wavelength band. When the optical filter (500) includes an infrared filter, it may block radiant heat emitted from external light from being transmitted to the image sensor (300). In addition, the optical filter (500) may transmit visible light and reflect infrared light.

[0112] The optical system (1000) according to the embodiment may further include a reflective member (400) for changing the path of light, as shown in FIG. 28. The reflective member (400) may be implemented as a prism or reflective mirror that reflects the incident light of the first lens group (LG1) toward the lenses. Hereinafter, the optical system according to each embodiment will be described in detail.

[0113]

[0114] A first embodiment will be described with reference to FIGS. 1 to 9. Referring to FIGS. 1 to 5, an optical system (1000) according to the first embodiment may include a lens unit (100) having a plurality of lens groups, for example, first to fourth lens groups (LG1, LG2, LG3, LG4). The first to fourth lens groups (LG1, LG2, LG3, LG4) may include lens groups with fixed positions and movable lens groups.

[0115] The first lens group (LG1) and the fourth lens group (LG4) are lens groups having fixed positions, and the second lens group (LG2) and the third lens group (LG3) are lens groups having variable positions. The second lens group (LG2) is arranged between the first lens group (LG1) and the third lens group (LG3), and the third lens group (LG3) can be arranged between the second lens group (LG2) and the fourth lens group (LG4). The first lens group (LG1) refracts incident light toward the second lens group (LG2), the second lens group (LG2) moves along the optical axis (OA) to change the zoom magnification (focal length), and the third lens group (LG3) moves along the optical axis (OA) to adjust the focal position on the image surface of the image sensor (300).

[0116]

[0117] The absolute value of the focal length of the first lens group (LG1) may be greater than the absolute value of the focal lengths of the second and third lens groups (LG2, LG3). For example, the absolute value of the focal length of the first lens group (LG1) may be more than twice the focal length of the second lens group (LG2). Accordingly, the first lens group (LG1) may disperse the incident light. The focal length of the second lens group (LG2) may be smaller than the absolute value of the focal length of the third lens group (LG3). The focal length of the fourth lens group (LG4) may be smaller than the absolute value of the focal length of the first lens group (LG1) and greater than the absolute value of the focal length of the third lens group (LG3). The power of the first and third lens groups (LG1, LG3) may have negative power, and the power of the second and fourth lens groups (LG2, LG4) may have positive power. The power is the reciprocal of the focal length value.

[0118] The lens unit (100) may include the first to ninth lenses (101-109). The first to ninth lenses (101-109) and the image sensor (300) may be sequentially arranged along the optical axis (OA) of the optical system (1000). The number of lenses of the first lens group (LG1) may include at least three lenses for adjusting the amount of incident light, refractive power, and chromatic aberration, and may include, for example, the first to fourth lenses (101, 102, 103, and 104). The second lens group (LG2) may include two or fewer lenses, and may include, for example, the fifth and sixth lenses (105 and 106). The third lens group (LG3) may include two or fewer lenses, and may include, for example, the seventh and eighth lenses (107 and 108). The fourth lens group (LG4) may include a ninth lens (109).

[0119] When the focal lengths of the first to fourth lens groups (LG1-LG4) are defined as FLG1, FLG2, FLG3, and FLG4, the following conditions can be satisfied.

[0120] Condition 1: FLG2*2 ≤ │FLG1│ < FLG2*4

[0121] Condition 2: (│FLG3│ - FLG2) < (FLG4 - │FLG3│)

[0122] Condition 3: FLG4 < │FLG1│ < FLG4*2

[0123] Condition 4: FLG4 < (│FLG3│*2) < FLG1

[0124] The first and fourth lens groups (LG1, LG4) are fixed in position, and the second lens group (LG2) and the third lens group (LG3) are movable in the direction of the optical axis (OA), so that the optical system (1000) can provide various magnifications by moving the lens groups. In addition, the ninth lens (109) of the fourth lens group (LG4) can control the incident angle of the chief ray to refract the light parallel to the optical axis so that it is incident toward the image sensor (300).

[0125]

[0126] The first and fourth lenses (101, 104) can correct aberrations by having refractive powers of opposite signs (+, -), and the sixth and seventh lenses (106, 107) can correct aberrations by having refractive powers of opposite signs (+, -). The seventh and eighth lenses (107, 108) can correct aberrations by having refractive powers of opposite signs (+, -).

[0127] The center spacing between the first to fourth lenses (101, 102, 103, 104) may be a fixed spacing depending on the operation mode described below. For example, the center spacing between the first to fourth lenses (101, 102, 103, 104) may not change depending on the operation mode and may have a constant spacing. Here, the center spacing between the lenses may refer to the optical axis spacing between adjacent lenses.

[0128] The fifth and sixth lenses (105, 106) may have a set spacing. In detail, the center spacing between adjacent lenses (104, 105) may be a fixed spacing according to an operation mode to be described later. The seventh and eighth lenses (107, 108) may have a set spacing. In detail, the center spacing between the seventh and eighth lenses (107, 108) may be constant according to an operation mode to be described later. The optical axis spacing (BFL) between the ninth lens (109) and the image sensor (300) may be constant according to an operation mode. The ninth lens (109) may have a set spacing with the image sensor (300) or / and the optical filter (500), and may have a fixed spacing that does not change according to an operation mode.

[0129]

[0130] The first lens (101) may have a positive (+) refractive power on the optical axis (OA). The first lens (101) may include a plastic or glass material, and may be, for example, a plastic material. The first surface (S1) on the object side of the first lens (101) may have a convex shape, and the second surface (S2) on the sensor side may have a concave shape. That is, the first lens (101) may have a convex meniscus shape toward the object on the optical axis (OA). Alternatively, the first surface (S1) may have a concave shape, and the second surface (S2) may have a convex shape. At least one or both of the first surface (S1) and the second surface (S2) may be aspherical, and the conic constant and aspherical coefficients from the 4th order (H) to the 20th order (J) of the first and second surfaces (S1, S2) may be represented by L1S1 and L1S2 in FIG. 5.

[0131] The maximum effective length of the first lens (101) may be the largest among the lenses. That is, the effective length of the first surface (S1) of the first lens (101) in the first direction (X) may be the largest among the lenses. The average of the effective lengths of the first and second surfaces (S1, S2) in the first direction (X) may be larger than the average of the effective lengths of the object-side surfaces and the sensor-side surfaces of the second to ninth lenses (102-109). The maximum effective length of at least one of the first and second lenses (101, 102) in the second direction (Y) may be the largest among the lenses. That is, the effective length of the first surface (S1) of the first lens (101) in the second direction (Y) may be the largest among the lenses. The average of the effective lengths of the first and second surfaces (S1, S2) in the second direction (Y) may be greater than the average of the effective lengths of the object-side and sensor-side surfaces of the second to eighth lenses (102-108). Accordingly, the first lens (101) may improve optical aberrations or control incident light. The first surface (S1) and the second surface (S2) may be provided without critical points from the optical axis to the end of the effective area.

[0132] The first and second surfaces (S1, S2) of the first lens (101) may have the same length in the second direction (Y). The seventh and eighth surfaces (S7, S8) of the fourth lens (104) may have the same length in the second direction (Y). The seventeenth and eighteenth surfaces (S17, S18) of the ninth lens (109) may have the same length in the second direction (Y). Preferably, the maximum effective length of the object-side surface (S1) of the first lens (101) may be the largest among the effective lengths of the object-side surface and the sensor-side surface of each lens.

[0133]

[0134] The second lens (102) may have positive (+) or negative (-) refractive power on the optical axis (OA), for example, may have positive refractive power. The second lens (102) may include a plastic or glass material, for example, may be a plastic material. The object-side third surface (S3) of the second lens (102) may have a convex shape, and the sensor-side fourth surface (S4) may have a concave shape. The second lens (102) may have a convex meniscus shape toward the object. Alternatively, the third surface (S3) may have a convex shape, and the fourth surface (S4) may have a convex shape. Alternatively, the third surface (S3) may have a concave shape, and the fourth surface (S4) may have a convex shape. In contrast, the third surface (S3) may have a concave shape, and the fourth surface (S4) may have a concave shape.

[0135] At least one or both of the third surface (S3) and the fourth surface (S4) of the second lens (102) may be aspherical, and the conic constant (K) and the aspherical coefficient (AJ) may be represented by L2S3 and L2S4 in Fig. 5. The third surface (S3) and the fourth surface (S4) may be provided without a critical point from the optical axis to the end of the effective area.

[0136]

[0137] The third lens (103) may have a refractive power of the same sign as the refractive power of the first lens (101) on the optical axis (OA). That is, the third lens (103) may have a negative refractive power. The third lens (103) may include a plastic or glass material, and may be, for example, a plastic material.

[0138] The third lens (103) may have a convex shape on the object-side fifth surface (S5) and a concave shape on the sensor-side sixth surface (S6). The third lens (103) may have a convex meniscus shape toward the object. Alternatively, the third lens (103) may have concave shapes on both sides. Alternatively, the fifth surface (S5) may have a convex shape and the sixth surface (S6) may have a convex shape. Alternatively, the fifth surface (S5) may have a concave shape and the sixth surface (S6) may have a convex shape. At least one or both of the fifth surface (S5) and the sixth surface (S6) of the third lens (103) may be aspherical. The aspheric coefficient (AJ) and the conic constant (K) of the fifth and sixth surfaces (S5, S6) can be represented by L3S5 and L3S6 in Fig. 5. The fifth surface (S5) and the sixth surface (S6) can be provided without a critical point from the optical axis to the end of the effective area.

[0139]

[0140] The fourth lens (104) may have a refractive power of the same sign as the refractive power of the first lens (101) at the optical axis (OA). That is, the fourth lens (104) may have a negative refractive power. The fourth lens (104) may include a plastic or glass material, and may be, for example, a plastic material. The object-side seventh surface (S7) of the fourth lens (104) may have a convex shape, and the sensor-side eighth surface (S8) may have a concave shape. The fourth lens (104) may have a convex meniscus shape toward the object. Alternatively, the fourth lens (104) may have a concave shape on both sides. Alternatively, the seventh surface (S7) may have a convex shape, and the eighth surface (S8) may have a convex shape. In contrast, the seventh surface (S7) may have a concave shape, and the eighth surface (S8) may have a convex shape.

[0141] At least one or both of the seventh surface (S7) and the eighth surface (S8) of the fourth lens (104) may be aspherical. The aspherical coefficient (AJ) and the conic constant (K) of the seventh and eighth surfaces (S7, S8) may be represented by L4S7 and L4S8 in FIG. 5. The seventh surface (S7) and the eighth surface (S8) may be provided without critical points from the optical axis to the ends of the effective areas.

[0142]

[0143] The third and fourth lenses (103, 104) can compensate for chromatic aberration occurring in the first and second lenses (101, 102). The refractive index of the first lens (101) is arranged to be greater than the refractive index of the second lens (102), so as to disperse the incident light. Accordingly, since the first lens group (LG1) controls the dispersion of the light provided to the second lens group (LG2), an increase in the lens size of the second lens group (LG2) can be suppressed. The change in the center distance (DG12) between the first and second lens groups (LG1, LG2) can be set according to the operating mode by the radius of curvature of the eighth surface (S8) of the fourth lens (104).

[0144] At least one or all of the first to fourth lenses (101-104) may have a meniscus shape convex toward the object. The central thickness of the first and second lenses (101, 102) may be greater than the central thickness of the third and fourth lenses (103, 104). The central thickness of each of the first to fourth lenses (101-104) may be 1 mm or less. The central spacing between the first to fourth lenses (101-104) may be less than 1 mm. Accordingly, an increase in the size of the first lens group (LG1) can be suppressed.

[0145]

[0146] The fifth lens (105) may have a positive (+) refractive power on the optical axis (OA). The fourth lens (104) may include a plastic or glass material, for example, a plastic material, and may have a refractive index of less than 1.6. The object-side surface (S9) of the fifth lens (105) on the optical axis may have a convex shape, and the sensor-side tenth surface (S10) may have a convex shape. That is, the fifth lens (105) may have a convex shape on both sides on the optical axis (OA). Alternatively, the ninth surface (S9) may be convex on the optical axis (OA), and the tenth surface (S10) may be concave on the optical axis (OA). At least one or both of the ninth surface (S9) and the tenth surface (S10) of the fifth lens (105) may be aspherical. The conic constant and aspheric coefficient (AJ) of the ninth and tenth surfaces (S9, S10) can be represented by L5S9 and L5S10 in Fig. 5. The ninth surface (S9) and the tenth surface (S10) can be provided without a critical point from the optical axis to the end of the effective area.

[0147]

[0148] The sixth lens (106) may have positive (+) or negative (-) refractive power on the optical axis (OA). The sixth lens (106) may have negative refractive power opposite to that of the fifth lens (105) on the optical axis (OA). The sixth lens (105) may include a plastic or glass material, and may be, for example, a plastic material. The object-side eleventh surface (S11) of the sixth lens (106) may have a concave shape on the optical axis (OA), and the sensor-side twelfth surface (S12) may have a concave shape. That is, the sixth lens (106) may have a concave shape on both sides on the optical axis (OA). At least one or both of the eleventh surface (S11) and the twelfth surface (S12) may be aspherical. The conic constant and aspherical coefficient of the 11th and 12th surfaces (S11, S12) can be represented by L6S11 and L6S12 of Fig. 5. The 11th surface (S11) and the 12th surface (S12) of the 6th lens (106) can be provided without a critical point from the optical axis to the end of the effective area.

[0149] As another example, the eleventh surface (S11) of the sixth lens (106) may have a convex shape in the optical axis (OA), and the twelfth surface (S12) may have a convex shape in the optical axis (OA). Alternatively, the eleventh surface (S11) may have a concave shape in the optical axis (OA), and the twelfth surface (S12) may have a convex shape in the optical axis (OA). Alternatively, the eleventh surface (S11) may have a convex shape in the optical axis (OA), and the twelfth surface (S12) may have a concave shape in the optical axis (OA).

[0150]

[0151] The fifth lens (105) may have a convex shape on both sides, and the sixth lens (106) may have a concave shape on both sides. The center thickness (CT5) of the fifth lens (105) may be thicker than the edge thickness. The center thickness of the sixth lens (106) may be thinner than the edge thickness. Accordingly, the gap between the tenth and eleventh surfaces (S10, S11) may be reduced by the convex tenth surface (S10) of the fifth lens (105) and the concave eleventh surface (S11) of the sixth lens (106). The Abbe number (Vd5) of the fifth lens (105) may be greater than the Abbe numbers of the first to fourth lenses (101-104) and the ninth lens (109). The difference in Abbe numbers between the fifth lens (105) and the sixth lens (106) may be greater than 20 or greater than 30. Accordingly, the second lens group (LG2) can minimize changes in chromatic aberration caused by changes in position according to changes in the operation mode.

[0152]

[0153] The seventh lens (107) may have positive (+) or negative (-) refractive power in the optical axis (OA), for example, may have positive refractive power. The seventh lens (107) may include a plastic or glass material, for example, may be a plastic material. The object-side 13th surface (S13) of the seventh lens (107) may have a concave shape, and the sensor-side 18th surface (S18) may have a convex shape. That is, the seventh lens (107) may have a meniscus shape that is convex toward the sensor side in the optical axis (OA). Alternatively, the 13th surface (S13) may have a convex shape in the optical axis (OA), and the 14th surface (S14) may have a convex shape in the optical axis (OA). Alternatively, the 13th surface (S13) may have a concave shape in the optical axis (OA), and the 14th surface (S14) may have a concave shape in the optical axis (OA). Alternatively, the 13th surface (S13) may have a convex shape in the optical axis (OA), and the 14th surface (S14) may have a concave shape in the optical axis (OA).

[0154] At least one or both of the 13th surface (S13) and the 14th surface (S14) of the 7th lens (107) may be aspherical. The aspherical coefficient and the conic constant of the 13th and 14th surfaces (S13, S14) may be represented by L7S13 and L7S14 in FIG. 5. The 13th surface (S13) and the 14th surface (S14) may be provided without a critical point from the optical axis to the end of the effective area.

[0155] The above-described eighth lens (108) may have positive (+) or negative (-) refractive power on the optical axis (OA), and may have negative refractive power. The refractive power of the eighth lens (108) has a sign opposite to the sign of the refractive power of the seventh lens (107), so that chromatic aberration can be improved. The above-described eighth lens (108) may include a plastic or glass material, and may be, for example, a plastic material.

[0156] The eighth lens (108) may include a fifteenth surface (S15) on the object side and a sixteenth surface (S16) on the sensor side. The fifteenth surface (S15) may have a convex shape on the optical axis (OA), and the sixteenth surface (S16) may have a concave shape. That is, the eighth lens (108) may have a meniscus shape that is convex toward the object on the optical axis (OA). As another example, the fifteenth surface (S15) may have a concave shape, and the sixteenth surface (S16) may have a convex shape. Alternatively, the fifteenth surface (S15) may have a convex shape, and the sixteenth surface (S16) may have a convex shape on the optical axis (OA). In contrast, the 15th surface (S15) may have a concave shape, and the 16th surface (S16) may have a concave shape.

[0157] At least one or both of the fifteenth surface (S15) and the sixteenth surface (S16) of the eighth lens (108) may be aspherical. The aspherical coefficient and the conic constant of the fifteenth and sixteenth surfaces (S15, S16) may be represented by L8S15 and L8S16 of FIG. 5. The fifteenth surface (S15) and the sixteenth surface (S16) may be provided without a critical point from the optical axis to the end of the effective area. As another example, the fifteenth surface (S15) or / and the sixteenth surface (S16) of the eighth lens (108) may have a critical point between the optical axis and the end of the effective area, and the critical point is a point where the trend of the Sag value changes. That is, the critical point is a point where the Sag value increases and then decreases on the lens surface, or a point where the Sag value decreases and then increases. The above Sag value is the optical axis distance between a straight line perpendicular to the center of each lens surface and the lens surface, and the Sag value has a positive value at a position located on the sensor side relative to the center of each lens surface, and a negative value at a position located on the object side relative to the center of each lens surface.

[0158] The seventh lens (107) and the eighth lens (108) have refractive powers of opposite signs, and when the Abbe number difference is set to be greater than 20, for example, 30 or more, chromatic aberration can be controlled. Accordingly, the third lens group (LG3) can minimize chromatic aberration changes caused by positions that change according to mode changes and perform an achromatic function.

[0159]

[0160] The ninth lens (109) may have positive or negative refractive power on the optical axis (OA), for example, may have positive refractive power. The ninth lens (109) may include a plastic or glass material, for example, may be a plastic material. The ninth lens (109) may include a seventeenth surface (S17) on the object side and an eighteenth surface (S18) on the sensor side. On the optical axis (OA), the seventeenth surface (S17) may have a concave shape, and the eighteenth surface (S18) may have a convex shape. That is, the ninth lens (109) may have a meniscus shape that is convex from the optical axis (OA) toward the sensor side. Alternatively, the seventeenth surface (S17) of the ninth lens (109) may have a convex shape, and the eighteenth surface (S18) may have a concave shape.

[0161] At least one or both of the seventeenth surface (S17) and the eighteenth surface (S18) of the ninth lens (109) may be aspherical. The aspherical coefficient and the conic constant of the seventeenth and eighteenth surfaces (S17, S18) may be represented by L9S17 and L9S18 in FIG. 5. At least one of the seventeenth surface (S17) and the eighteenth surface (S18) may be provided without a critical point from the optical axis to the end of the effective area. As another example, the eighteenth surface (S18) may have a critical point between the optical axis and the end of the effective area. As another example, both the seventeenth surface (S17) and the eighteenth surface (S18) may have critical points.

[0162] The absolute value of the radius of curvature of the 17th surface (S17) of the 9th lens (109) may be greater than 50 mm. The absolute value of the radius of curvature of the 18th surface (S18) is provided to be 20 mm or more smaller than the absolute value of the radius of curvature of the 17th surface (S17), so that the incident light can be refracted parallel to the image sensor (300). The effective length of the 9th lens (109) is provided to be longer than the effective length of the 8th lens (108), so that the incident light can be refracted to the periphery of the image sensor (300).

[0163]

[0164] The first surface (S1) and the second surface (S2) of the first lens (101) may each have a non-circular shape in which the effective lengths in the first direction (X) and the second direction (Y) are different from each other. The third surface (S3) of the second lens (102) may be non-circular in which the effective lengths in the first and second directions are different from each other, and the fourth surface (S4) may be circular in shape. The ninth surface (S9) and the tenth surface (S10) of the fifth lens (105) may each have a non-circular shape in which the effective lengths in the first and second directions are different from each other. The eleventh surface (S11) of the sixth lens (106) may be non-circular in which the effective lengths in the first and second directions are different from each other, and the twelfth surface (S12) may be circular in shape. The sixteenth surface (S16) of the eighth lens (108) may be non-circular in which the effective lengths in the first and second directions are different from each other, and the fifteenth surface (S15) may be circular in shape. Each of the seventeenth surface (S17) and the eighteenth surface (S18) of the ninth lens (109) may have a non-circular shape with different effective lengths in the first and second directions. The lens surfaces on both sides of each of the third, fourth, and seventh lenses (103, 104, and 107) may have a circular shape. Here, the circular lens surfaces have the same length in the first and second directions.

[0165] The effective lengths of the first to sixteenth surfaces (S1-16) of the first to ninth lenses (101 to 109) in the first and second directions are CA11x-CA82y, for example, the first and second surfaces are defined as CA11x, CA11y, CA12x, CA12y, the 15th and 16th surfaces are defined as CA82x, CA81y, CA82x, CA82y, and other lens surfaces can also be defined in the same form as above and can satisfy the following conditions.

[0166] Condition 1: 0.73 < CA11y / CA11x < 0.93

[0167] Condition 2: 0.73 < CA12y / CA12x < 0.93

[0168] Condition 3: 0.81 < CA21y / CA21x < 0.98

[0169] Condition 4: 0.71 < CA51y / CA51x < 0.91

[0170] Condition 5: 0.71 < CA52y / CA52x < 0.91

[0171] Condition 6: 0.81 < CA61y / CA61x < 0.98

[0172] Condition 7: 0.86 < CA82y / CA82x < 0.98

[0173] Condition 8: 0.74 < CA91y / CA91x < 0.94

[0174] Condition 9: 0.74 < CA92y / CA92x < 0.94

[0175] The above conditions can satisfy the conditions of 0.55 < CAm1y / CAm1x < 0.98 and 0.55 < CAn2y / CAn2x < 0.98, and m can be 1, 2, 5, 6, 9, and n can be 1, 5, 8, 9. Accordingly, when the maximum effective length of the second direction (Y) of each of the object-side surface and the sensor-side surface of the first to ninth lenses (101-109) is Max_CAy, it can satisfy Max_CAy < 6.5 mm or Max_CAy ≤ 6.2 mm, and can suppress an increase in the thickness in the thickness direction of the portable terminal having the optical system or in the direction orthogonal to the display surface.

[0176] The fourth lens group (LG4) may play a role in controlling the chief ray incidence angle (CRA). Specifically, the CRA of the optical system (1000) according to the embodiment may be less than about 20 degrees, and the ninth lens (109) of the fourth lens group (LG4) may correct the chief ray incidence angle of light incident on the image sensor (300) according to each operation mode.

[0177]

[0178] The camera module can move at least one or all of the second and third lens groups (LG2, LG3) among the plurality of lens groups (LG1, LG2, LG3, LG4) included in the optical system (1000) toward the object side or the sensor side along the optical axis (OA). As shown in Fig. 28, the camera module can include a driving member (DM1, DM2) connected to the optical system (1000). The driving members (DM1, DM2) include at least one or a plurality of first driving members (DM1) arranged on the outside of the second lens group (LG2) and at least one or a plurality of second driving members (DM2) arranged on the outside of the third lens group (LG3), and can move each of them in the direction of the optical axis (OA) according to the operation mode.

[0179] The above operation mode may include a first mode moving at a first magnification as shown in FIG. 2, and a third mode operating at a second magnification different from the first magnification as shown in FIG. 3. At this time, the second magnification may be greater than the first magnification. In addition, the operation mode may include a second mode having a magnification between the first and third modes as shown in FIG. 1. Here, the first magnification may be the lowest magnification of the optical system (1000), and the second magnification may be the highest magnification of the optical system (1000). The first magnification may be about 1.5 magnification or more, for example, 1.5 to about 5 magnification, the second magnification may be about 6 to about 11 magnification, and the third magnification may be about 4 to about 6 magnification between the first and second magnifications. 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.

[0180] As shown in Fig. 28, the driving members (DM1, DM2) can move (M1, M2) each of the second and third lens groups (LG2, LG3) or operate them in an initial mode according to one operation mode selected from the first to third modes. In detail, each of the plurality of driving members (DM1, DM2) is connected to the second lens group (LG2) and the third lens group (LG3), and can move each of the second lens group (LG2) and the third lens group (LG3) according to the operation mode. The initial mode 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 lens group (LG2) and the third lens group (LG3) may be positioned at a position defined as a first position (Position 1). In the second mode, each of the second lens group (LG2) and the third lens group (LG3) may be positioned at a second position (Position 2) defined as being closer to the object than the first position. In the third mode, each of the second lens group (LG2) and the third lens group (LG3) may be positioned at a third position (Position 3) defined as being closer to the sensor than the first position. The first position may be an area between the second and third positions.

[0181] In the first mode, the first position at which the second lens group (LG2) is positioned may be an area between the second and third positions at which the second lens group (LG2) is positioned in the second and third modes. In the first mode, the first position at which the third lens group (LG3) is positioned may be an area between the second and third positions at which the third lens group (LG3) is positioned in the second and third modes.

[0182]

[0183] Depending on the operation mode, either one or both of the second lens group (LG2) and the third lens group (LG3) can move along the optical axis, and the first and fourth lens groups (LG1, LG4) can be arranged at fixed positions. Depending on the operation mode, the second lens group (LG2) can move (M1), and the first and fourth lens groups (LG1, LG4) can be arranged at fixed positions. Depending on the operation mode, the third lens group (LG3) can move (M2), and the first and fourth lens groups (LG1, LG4) can be arranged at fixed positions.

[0184] In each of the first position, the second position, and the third position according to the operation mode, the first to fourth lens groups (LG1, LG2, LG3, LG4) may have a set interval from the adjacent lens groups. Accordingly, the optical system (1000) may have a constant TTL and BFL according to the operation mode, and the effective focal length and magnification of the optical system (1000) may be controlled by controlling the positions of some of the lens groups.

[0185]

[0186] For convenience of explanation, the center thickness of each of the first to ninth lenses (101-109) is CT1-CT9, the Abbe number is Vd1-Vd9, the refractive index is Nd1-Nd8, the average of the first direction (X) or maximum effective length is CA1-CA9, and the focal length can be defined as F1-F9.

[0187] The effective length (CA1) of the first lens (101) is the largest among the lenses, and the effective length of at least one of the seventh and eighth lenses (107, 108) is the smallest among the lenses. The effective length (CA1) of the first lens (101) may be 5.8 mm or more. The effective lengths (CA7, CA8) of the seventh and eighth lenses (107, 108) may be less than 5 mm.

[0188] The difference in the radius of curvature between the fifth surface (S5) and the sixth surface (S6) of the third lens (103) on the optical axis may be 50 mm or more. At least one of the radius of curvature of the fifth surface (S5) and the sixth surface (S6) of the third lens (103) may be 50 mm or more. The third lens (103) may have a large difference in the radius of curvature between the object-side surface and the sensor-side surface, and may have a thin center thickness of 0.5 mm or less. Accordingly, the third lens (103) can adjust the center thickness and shape of the fourth lens (104), and reduce light loss due to changes in the gap between the fourth and fifth lenses (104, 105). In addition, among the lenses, the lens surfaces having the smallest difference in the radius of curvature (absolute value) between adjacent lens surfaces are the eighth surface (S8) and the ninth surface (S9).

[0189] The absolute value difference in the radius of curvature between the 13th surface (S13) and the 14th surface (S14) of the seventh lens (107) on the optical axis may be the smallest among the differences in the radius of curvature (absolute value) between the object-side surface and the sensor-side surface of each lens, and may be, for example, 3 mm or less. Since the center thickness (CT7) of the seventh lens (107) is 2 mm or more and the difference in the radius of curvature (absolute value) of both sides is provided to be small, the light can be guided to the 9th lens (109) without causing a large change in the path of the incident light.

[0190]

[0191] In the absolute value of the focal length, the focal length (F3) of the third lens (103) may be the largest among the lenses, and the difference (absolute value) in the focal length between adjacent two lenses may be the largest for the third and fourth lenses (103, 104), and the difference (absolute value) in the focal lengths of the sixth and seventh lenses (106, 107) may be the smallest. The focal lengths of the first to ninth lenses (101-109) may be defined as F1-F9, and may satisfy the following conditions.

[0192] Condition 1: F1*2 < F2 < │F3│

[0193] Condition 2: F2 < │F3│ < F2*2

[0194] Condition 3: 0 < (│F6│ - F7) ≤ (│F4│ -F5) < 4mm

[0195] Condition 4: │F6│ < F9 < F1

[0196] Condition 5: (F1 + │F4│ + F5 + │F8│) < F2

[0197] Condition 6: (│F4│ - │F8│) < (F1 - F9)

[0198] The central thickness (CT5) of the fifth lens (105) may be the thickest among the central thicknesses of the lenses. At least one of the central thicknesses (CT3, CT4) of the third and fourth lenses (103, 104) may be the thinnest among the central thicknesses of the lenses. For example, the central thickness (CT4) of the fourth lens (104) may be equal to or smaller than the central thickness (CT3) of the third lens (103).

[0199] The sum of the central thicknesses of the lenses of the second lens group (LG2) may be greater than the sum of the central thicknesses of the lenses of the first lens group (LG1). The sum of the central thicknesses of the lenses of the second lens group (LG2) may be greater than the sum of the central thicknesses of the lenses of the third lens group (LG3). Accordingly, the second lens group (LG2) may guide light incident through the first lens group (LG1) to the effective area of ​​the third lens group (LG3).

[0200]

[0201] The optical axis spacing (DG12) between the first and second lens groups (LG1, LG2), the optical axis spacing (DG23) between the second and third lens groups (LG2, LG3), and the optical axis spacing (DG34) between the third and fourth lens groups (LG3, LG4) may each be at least 0.5 mm and at most 8 mm depending on the change in magnification of the operating modes. Specifically, the optical axis spacing (DG12) between the first and second lens groups (LG1, LG2) may be at least 0.5 mm, for example, in the range of 0.5 mm to 8 mm. The optical axis spacing (DG23) between the second and third lens groups (LG2, LG3) may be at least 2 mm, for example, in the range of 2 mm to 7 mm. The optical axis spacing (DG34) between the third and fourth lens groups (LG3, LG4) may be 0.5 mm or more, for example, in the range of 0.5 mm to 8 mm. Depending on the operation mode, the optical axis spacing (DG12, DG23, DG34) may change according to the movement in the optical axis direction of the second and third lens groups (LG2, LG3).

[0202] The relationship between DG12, DG23, and DG34 in modes 1, 2, and 3 is as follows.

[0203] Mode 1: DG34 < DG23 < DG12

[0204] Mode 2: DG34 < DG23 < DG12

[0205] Mode 3: DG12 < DG23 < DG34

[0206] In the above 1st, 2nd, and 3rd modes, DG12, DG23, and DG34 may be greater than the BFL. Here, the BFL is the optical axis distance from the sensor side of the 4th lens group (LG4) or the 9th lens (109) to the upper surface of the image sensor (300). In the above 1st, 2nd, and 3rd modes, the maximum movement distance of the 2nd and 3rd lens groups (LG2, LG3) is Max_mMd13, and can satisfy Max_mMd13 < 5.7 mm, and preferably, can satisfy Max_mMd13 ≤ 5.5 mm. Accordingly, the maximum movement distance for the zoom magnification can be reduced, thereby reducing the power consumption of the driving member.

[0207] Depending on the operating mode, the F number of the optical system (1000) provides a brightness of 4.5 or less, and the F number may be in the range of 2.2 to 4.5. The aperture may be located between the first lens group (LG1) and the second lens group (LG2), and may be arranged, for example, around the ninth surface (S9) of the fifth lens (105).

[0208]

[0209] Tables 1 and 2 and FIG. 4 are for the items of the mathematical formulas described above in the optical system (1000) of the first embodiment, such as TTL, BFL, effective focal length (F), focal length of each lens group, ImgH, effective length (X, Y), center thickness (CT) of each lens, center spacing (CG) between two adjacent lenses, TD (mm) which is the optical axis distance from the first surface (S1) to the eighteenth surface (S18), focal length (F1-F9) of each of the first to eighth lenses, diagonal angle of view (FOV), F number, etc. of the optical system (1000).

[0210] Item Example 1 Item Example 1 FLG1 (mm) - 20.117 ImgH (mm) 3.2 FLG2 (mm) 7.030 TTL (mm) 24.90 FLG3 (mm) - 9.34 BFL (mm) 1.0 FLG4 (mm) 16.171 TD (mm) 23.90

[0211] Table 2 can represent the effective focal length (F), field of view (FOV), F number, entrance pupil size (EPD), SD, and center spacing (DG12, DG23, DG34) between adjacent lens groups according to the first to third modes in the optical system according to the first embodiment. The SD is the optical axis distance from the position of the aperture to the image sensor.

[0212] Example 1 Mode 1 Mode 2 Mode 3 F (mm) 13.50 17.00 27.40 DG 12 (mm) 5.88 24.45 01.112 DL G 23 (mm) 4.45 44.06 24.480 DG 34 (mm) 1.38 63.21 6.13 EPD (EPD1 / EPD2 / EPD3) 5.00 05.31 36.227 Fno (Fno1 / Fno2 / Fno3) 2.70 03.20 04.400 FOV (degrees) 20.6 60 16.46 010.150 SD 13.97 15.40 18.74

[0213]

[0214] As shown in Fig. 6, the optical system according to the first embodiment can have MTF characteristics according to the first, second, and third modes (Wide, Mid, Tele mode). In detail, Fig. 6 is a graph of the diffraction MTF characteristics of the optical system (1000) operating in the first to third modes, and it can be seen that the change in the position of defocusing according to the operating mode is not large.

[0215] FIGS. 7 to 9 are graphs measuring spherical aberration (longitudinal spherical aberration), astigmatic field curves, and distortion from left to right in an aberration graph of an optical system according to a first embodiment. In FIGS. 7 to 9, the X-axis may represent a focal length (mm) and a degree of distortion (%), and the Y-axis may represent the height of an image. In addition, the graph for spherical aberration is a graph for light in wavelength bands of about 435 nm, about 486 nm, about 546 nm, about 587 nm, and about 656 nm, and the graphs for astigmatic aberration and distortion aberration are graphs for light in wavelength bands of 546 nm. In the aberration diagram, 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 aberration change according to the operation mode (wide, mid, tele mode) is not large.

[0216]

[0217] An optical system and a camera module having the same according to a second embodiment will be described with reference to FIGS. 10 to 18. In describing a configuration according to the second embodiment, the same configuration as that of the first embodiment may include the configuration and description of the first embodiment.

[0218] Referring to FIGS. 10 to 14, an optical system (1000) according to a second embodiment may include a lens unit (100A) having first to fourth lens groups (LG1, LG2, LG3, LG4). The first lens group (LG1) and the fourth lens group (LG4) are lens groups with fixed positions, and the second lens group (LG2) and the third lens group (LG3) are lens groups with variable positions.

[0219] The absolute value of the focal length of the first lens group (LG1) may be greater than the absolute value of the focal lengths of the second and third lens groups (LG2, LG3). For example, the absolute value of the focal length of the first lens group (LG1) may be more than twice the focal length of the second lens group (LG2). The focal length of the second lens group (LG2) may be less than the absolute value of the focal length of the third lens group (LG3). The focal length of the fourth lens group (LG4) may be less than the absolute value of the focal length of the first lens group (LG1) and greater than the absolute value of the focal length of the third lens group (LG3).

[0220] The first lens group (LG1) may include first to third lenses (111, 112, 113, 114), the second lens group (LG2) may include fifth and sixth lenses (115, 116), the third lens group (LG3) may include seventh and eighth lenses (117, 118), and the fourth lens group (LG4) may include ninth lenses (119). The focal lengths of the first to fourth lens groups (LG1-LG4) may satisfy the following conditions.

[0221] Condition 1: FLG2*2 ≤ │FLG1│ < FLG2*4

[0222] Condition 2: (│FLG3│ - FLG2) < (FLG4 - │FLG3│)

[0223] Condition 3: FLG4 < │FLG1│

[0224]

[0225] The first, fifth, fourth, seventh, and ninth lenses (111, 112, 115, 117, and 119) may have positive (+) refractive power on the optical axis (OA). The second, third, sixth, and eighth lenses (112, 113, 114, 116, and 116) may have negative (-) refractive power on the optical axis. The first to eighteenth surfaces (S1-S18) of the first to ninth lenses (111-119) may be aspherical, and the radius of curvature (RAD), the aspherical coefficient (AJ), and the conic constant (K) may be represented as shown in FIG. 23. At least one or all of the first to ninth lenses (111-119) may be made of a plastic material. Alternatively, at least one of the first, fourth, fifth, and ninth lenses may be injection-molded with a glass material and provided as an aspherical lens.

[0226]

[0227] The first surface (S1) of the first lens (111) may have a convex shape, and the second surface (S2) may have a concave shape. The third surface (S3) of the second lens (112) may have a convex shape, and the fourth surface (S4) may have a concave shape. The fifth surface (S5) of the third lens (113) may have a convex shape, and the sixth surface (S6) may have a concave shape. The seventh surface (S7) of the fourth lens (114) may have a convex shape, and the eighth surface (S8) may have a concave shape.

[0228] The third and fourth lenses (113, 114) can compensate for chromatic aberration occurring in the first and second lenses (111, 112). The refractive indices of the first and third lenses (111, 113) are arranged to be greater than the refractive indices of the second and fourth lenses (112, 114), thereby dispersing the incident light. Accordingly, since the first lens group (LG1) controls the dispersion of the light provided to the second lens group (LG2), an increase in the lens size of the second lens group (LG2) can be suppressed.

[0229]

[0230] The ninth surface (S9) of the fifth lens (115) may have a convex shape, and the tenth surface (S10) may have a convex shape. The eleventh surface (S11) of the sixth lens (116) may have a concave shape, and the twelfth surface (S12) may have a concave shape.

[0231] The Abbe number (Vd5) of the fifth lens (115) may be greater than the Abbe numbers of the first to fourth lenses (111-114). The difference in Abbe numbers between the fourth lens (114) and the fifth lens (115) may be greater than 20 or greater than 30. Accordingly, the second lens group (LG2) can minimize changes in chromatic aberration caused by changes in position according to changes in the operation mode.

[0232] The 13th surface (S13) of the seventh lens (117) may have a concave shape, and the 14th surface (S14) may have a convex shape. 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 15th surface (S15) of the eighth lens (118) may have a convex shape, and the 16th surface (S16) may have a concave shape. When the difference in Abbe numbers between the seventh lens (117) and the eighth lens (118) is set to be greater than 20, for example, greater than 30, chromatic aberration can be controlled. Accordingly, the third lens group (LG3) can minimize chromatic aberration changes caused by positions that change according to mode changes and perform an achromatic function.

[0233] The seventeenth surface (S17) of the ninth lens (119) may have a concave shape, and the eighteenth surface (S18) may have a convex shape. The absolute value of the radius of curvature of the seventeenth surface (S17) may be greater than 50 mm. The absolute value of the radius of curvature of the eighteenth surface (S18) of the ninth lens (119) may be provided to be 20 mm or more smaller than the absolute value of the radius of curvature of the seventeenth surface (S17). In addition, the absolute value of the radius of curvature of the eighteenth surface (S18) may be 30 mm or less or 20 mm or less, so that the incident light may be refracted parallel to the image sensor (300). The effective length of the ninth lens (119) is provided to be longer than the effective length of the eighth lens (118), so that the incident light may be refracted to the periphery of the image sensor (300).

[0234] The effective length and shape of the first to ninth lenses (111-119) above shall refer to the description of the first embodiment. The effective length of the object-side surface and the sensor-side surface of each of the first to ninth lenses (111-119) shall refer to the first embodiment, and in the first, second, fifth, sixth, eighth, and ninth lenses, at least one of the object-side surface and the sensor-side surface may have different effective lengths in the first and second directions.

[0235] The camera module can move at least one or all of the second and third lens groups (LG2, LG3) among the plurality of lens groups (LG1, LG2, LG3, LG4) included in the optical system (1000) toward the object side or the sensor side along the optical axis (OA). The operation mode may include a first mode for moving at a first magnification as shown in FIG. 11, and a third mode for operating at a second magnification different from the first magnification as shown in FIG. 12. At this time, the second magnification may be greater than the first magnification. In addition, the operation mode may include a second mode having a magnification between the first and third modes as shown in FIG. 10. The magnifications and positions according to the first to third modes will be described with reference to the description of the first embodiment.

[0236] Depending on the operation mode, at least one of the second lens group (LG2) and the third lens group (LG3) can move along the optical axis, and the first and fourth lens groups (LG1, LG4) can be arranged at fixed positions. Depending on the operation mode, the second lens group (LG2) can move (M1), and the first and fourth lens groups (LG1, LG4) can be arranged at fixed positions. Depending on the operation mode, the third lens group (LG3) can move (M2), and the first and fourth lens groups (LG1, LG4) can be arranged at fixed positions. In each of the first position, the second position, and the third position according to the operation mode, the first to fourth lens groups (LG1, LG2, LG3, LG4) can have a set gap from adjacent lens groups. Accordingly, the optical system (1000) can have constant TTL and BFL depending on the operation mode, and the effective focal length and magnification of the optical system (1000) can be controlled by controlling the positions of some lens groups.

[0237]

[0238] The effective length (CA1) of the first lens (111) is the largest among the lenses, and the effective length (CA7) of the seventh lens (117) is the smallest among the lenses. The effective length (CA1) of the first lens (111) may be 5.8 mm or more. The effective length (CA6) of the sixth lens (116) may be less than 5 mm.

[0239] The radius of curvature of at least one or both of the fifth surface (S5) and the sixth surface (S6) of the third lens (113) on the optical axis may be 50 mm or more. The third lens (113) may be provided with a large radius of curvature of the object-side surface and the sensor-side surface and a thin thickness of 0.5 mm or less, so that the central thickness and shape of the fourth lens (114) can be adjusted, and light loss due to changes in the gap between the fourth and fifth lenses (114, 115) can be reduced. In addition, among the lenses, the lens surfaces having the smallest difference in the radius of curvature (absolute value) of adjacent lens surfaces are the eighth surface (S8) and the ninth surface (S9). The absolute value difference in the radius of curvature between the 13th surface (S13) and the 14th surface (S14) of the seventh lens (117) on the optical axis may be the smallest among the differences in the radius of curvature (absolute value) between the object-side surface and the sensor-side surface of each lens, and may be, for example, 3 mm or less. Since the center thickness (CT7) of the seventh lens (117) is 2 mm or more and the difference in the radius of curvature (absolute value) between the two sides is provided to be small, the light can be guided to the 9th lens (119) without causing a large change in the path of the incident light.

[0240]

[0241] In the absolute value of the focal length, the focal length (F3) of the third lens (113) may be the largest among the lenses, and the difference (absolute value) in the focal length between adjacent two lenses may be the largest for the third and fourth lenses (113, 114), and the difference (absolute value) in the focal lengths of the sixth and seventh lenses (116, 117) may be the smallest. The focal lengths of the first to ninth lenses (111-119) may satisfy the following conditions.

[0242] Condition 1: F1*5 < F2 < │F3│

[0243] Condition 2: F2*5 < │F3│ < F2*10

[0244] Condition 3: 0 < (│F6│ - F7) ≤ (│F4│ -F5) < 4mm

[0245] Condition 4: │F6│ < F9 < F1

[0246] Condition 5: (F1 + │F4│ + F5 + │F8│) < F2

[0247] Condition 6: (│F4│ - │F8│) < (F1 - F9)

[0248]

[0249] The center thickness (CT5) of the fifth lens (115) may be the thickest among the center thicknesses of the lenses, and at least one of the center thicknesses (CT3, CT4) of the third and fourth lenses (113, 114) may be the thinnest among the center thicknesses of the lenses. For example, the center thickness (CT4) of the fourth lens (114) may be equal to or greater than the center thickness (CT3) of the third lens (113). The sum of the center thicknesses of the lenses of the second lens group (LG2) may be greater than the sum of the center thicknesses of the first lens group. The sum of the center thicknesses of the lenses of the second lens group (LG2) may be greater than the sum of the center thicknesses of the lenses of the third lens group. Accordingly, the second lens group (LG2) may guide light incident through the first lens group (LG1) to the effective area of ​​the third lens group (LG3). The optical axis spacing between the first to fourth lens groups (LG1-LG4) refers to the description of the first embodiment, and the relationship between DG12, DG23, and DG34 according to the first to third modes is as follows.

[0250] Mode 1: DG34 < DG23 < DG12

[0251] Mode 2: DG34 < DG23 < DG12

[0252] Mode 3: DG12 < DG23 < DG34

[0253] Depending on the operating mode, the F number of the optical system (1000) provides a brightness of 4.5 or less, and the F number may be in the range of 2.2 to 4.5. The aperture may be positioned between the first lens group (LG1) and the second lens group (LG2), and may be arranged, for example, around the ninth surface (S9) of the fifth lens (115).

[0254]

[0255] Tables 3, 4 and FIG. 13 are for the items of the mathematical formulas described above in the optical system (1000) of the second embodiment, and Table 3 shows the TTL of the optical system (1000), the focal length of each lens group, BFL, ImgH, and TD (mm), which is the optical axis distance from the first surface (S1) to the eighteenth surface (S18).

[0256] Item Example 2 Item Example 2 FLG1 (mm) - 19.797 ImgH (mm) 3.2 FLG2 (mm) 7.00 1 TTL (mm) 24.90 FLG3 (mm) - 8.89 BFL (mm) 1.0 FLG4 (mm) 15.424 TD (mm) 23.90

[0257] Table 4 can represent the effective focal length (F), field of view (FOV), F number, entrance pupil size (EPD), SD, and center spacing (DG12, DG23, DG34) between adjacent lens groups according to the first to third modes in the optical system according to the second embodiment. The SD is the optical axis distance from the position of the aperture to the image sensor.

[0258] Example 2 Mode 1 Mode 2 Mode 3 F (mm) 13.50 17.00 27.40 DG 12 (mm) 5.80 04.44 11.100 DL G 23 (mm) 4.27 64.03 24.469 D G 34 (mm) 1.43 83.15 6.054 EPD (EPD1 / EPD2 / EPD3) 5.00 05.31 36.089 Fno (Fno1 / Fno2 / Fno3) 2.70 03.20 04.500 FOV (degrees) 20.65 16.42 10.10 SD 14.03 15.50 18.84

[0259]

[0260] As shown in Fig. 15, the optical system according to the second embodiment can have MTF characteristics according to the first, second, and third modes (wide, mid, tele mode). In detail, Fig. 15 is a graph of the diffraction MTF characteristics of the optical system (1000) operating in the first to third modes, and it can be seen that the change in the position of defocusing according to the operating mode is not large.

[0261] FIGS. 16 to 18 are graphs measuring spherical aberration (longitudinal spherical aberration), astigmatic field curves, and distortion from left to right in an aberration graph of an optical system according to a second embodiment. In FIGS. 16 to 18, the X-axis may represent a focal length (mm) and a degree of distortion (%), and the Y-axis may represent the height of the image. In addition, the graph for spherical aberration is a graph for light in wavelength bands of about 435 nm, about 486 nm, about 546 nm, about 587 nm, and about 656 nm, and the graphs for astigmatic aberration and distortion aberration are graphs for light in wavelength bands of 546 nm. In the aberration diagram, 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 aberration change according to the operation mode (wide, mid, tele mode) is not large.

[0262]

[0263] An optical system and a camera module having the same according to a third embodiment will be described with reference to FIGS. 19 to 26. In describing a configuration according to the third embodiment, the same configuration as the first embodiment may include the configuration and description of the first embodiment.

[0264] Referring to FIGS. 19 to 23, an optical system (1000) according to a third embodiment may include a lens unit (100B) having first to fourth lens groups (LG1, LG2, LG3, LG4). The first lens group (LG1) and the fourth lens group (LG4) are lens groups with fixed positions, and the second lens group (LG2) and the third lens group (LG3) are lens groups with variable positions.

[0265] The absolute value of the focal length of the first lens group (LG1) may be greater than the absolute value of the focal lengths of the second and third lens groups (LG2, LG3). For example, the absolute value of the focal length of the first lens group (LG1) may be more than twice the focal length of the second lens group (LG2). The focal length of the second lens group (LG2) may be less than the absolute value of the focal length of the third lens group (LG3). The focal length of the fourth lens group (LG4) may be less than the absolute value of the focal length of the first lens group (LG1) and greater than the absolute value of the focal length of the third lens group (LG3).

[0266] The first lens group (LG1) may include first to third lenses (121, 122, 123, 124), the second lens group (LG2) may include fifth and sixth lenses (125, 126), the third lens group (LG3) may include seventh and eighth lenses (127, 128), and the fourth lens group (LG4) may include ninth lenses (129). The focal lengths of the first to fourth lens groups (LG1-LG4) may satisfy the following conditions.

[0267] Condition 1: FLG2*2 ≤ │FLG1│ ≤ FLG2*4

[0268] Condition 2: (│FLG3│ - FLG2) < (FLG4 - │FLG3│)

[0269] Condition 3: FLG4 < │FLG1│

[0270]

[0271] The first, second, fifth, seventh, and ninth lenses (121, 122, 125, 127, and 129) may have positive refractive power on the optical axis (OA). The second, third, sixth, and eighth lenses (122, 123, 126, and 128) may have negative refractive power on the optical axis. The first to eighteenth surfaces (S1-S18) of the first to ninth lenses (121-129) may be aspherical, and the radius of curvature (RAD), the aspherical coefficient (AJ), and the conic constant (K) may be obtained as shown in FIG. 23. At least one or all of the first to ninth lenses (121-129) may be made of a plastic material. Alternatively, at least one of the first, fourth, fifth, and ninth lenses may be injection-molded with a glass material and provided as an aspherical lens.

[0272] The first surface (S1) of the first lens (121) may have a convex shape, and the second surface (S2) may have a concave shape. The third surface (S3) of the second lens (122) may have a convex shape, and the fourth surface (S4) may have a concave shape. The fifth surface (S5) of the third lens (123) may have a convex shape, and the sixth surface (S6) may have a concave shape. The seventh surface (S7) of the fourth lens (124) may have a convex shape, and the eighth surface (S8) may have a concave shape.

[0273] The ninth surface (S9) of the fifth lens (125) may have a convex shape, and the tenth surface (S10) may have a convex shape. The eleventh surface (S11) of the sixth lens (126) may have a concave shape, and the twelfth surface (S12) may have a concave shape.

[0274] The Abbe number (Vd5) of the fifth lens (125) may be greater than the Abbe numbers of the first to fourth lenses (121-124). The difference in Abbe numbers between the fourth lens (124) and the fifth lens (125) may be greater than 20 or greater than 30. Accordingly, the second lens group (LG2) can minimize changes in chromatic aberration caused by changes in position according to changes in the operation mode.

[0275] The 13th surface (S13) of the seventh lens (127) may have a concave shape, and the 14th surface (S14) may have a convex shape. The refractive power of the seventh lens (127) has a sign opposite to the sign of the refractive power of the sixth lens (126), so that chromatic aberration can be improved. The 15th surface (S15) of the eighth lens (128) may have a convex shape, and the 16th surface (S16) may have a concave shape. When the difference in Abbe numbers between the seventh lens (127) and the eighth lens (128) is set to be greater than 20, for example, greater than 30, chromatic aberration can be controlled. Accordingly, the third lens group (LG3) can minimize chromatic aberration changes caused by positions that change according to mode changes and perform an achromatic function.

[0276] The 17th surface (S17) of the 9th lens (129) may have a concave shape, and the 18th surface (S18) may have a convex shape. The absolute value of the radius of curvature of the 18th surface (S18) of the 9th lens (129) may be provided to be 20 mm or more smaller than the absolute value of the radius of curvature of the 17th surface (S17). The absolute value of the radius of curvature of the 17th surface (S17) may be greater than 50 mm. The absolute value of the radius of curvature of the 18th surface (S18) may be 30 mm or less or 20 mm or less, so that the incident light may be refracted parallel to the image sensor (300). The effective length of the 9th lens (129) is provided to be longer than the effective length of the 8th lens (128), so that the incident light may be refracted to the periphery of the image sensor (300).

[0277]

[0278] The effective length and shape of the first to ninth lenses (121-129) above shall refer to the description of the first embodiment. The effective length of the object-side surface and the sensor-side surface of each of the first to ninth lenses (121-129) shall refer to the first embodiment, and in the first, second, fifth, sixth, eighth, and ninth lenses, at least one of the object-side surface and the sensor-side surface may have different effective lengths in the first and second directions.

[0279] The camera module can move at least one or all of the second and third lens groups (LG2, LG3) among the plurality of lens groups (LG1, LG2, LG3, LG4) included in the optical system (1000) toward the object side or the sensor side along the optical axis (OA). The operation mode may include a first mode that moves at a first magnification as shown in FIG. 20, and a third mode that operates at a second magnification different from the first magnification as shown in FIG. 21. At this time, the second magnification may be greater than the first magnification. In addition, the operation mode may include a second mode that has a magnification between the first and third modes as shown in FIG. 19. The magnifications and positions according to the first to third modes will be described with reference to the description of the first embodiment.

[0280] Depending on the operation mode, at least one of the second lens group (LG2) and the third lens group (LG3) can move along the optical axis, and the first and fourth lens groups (LG1, LG4) can be arranged at fixed positions. Depending on the operation mode, the second lens group (LG2) can move (M1), and the first and fourth lens groups (LG1, LG4) can be arranged at fixed positions. Depending on the operation mode, the third lens group (LG3) can move (M2), and the first and fourth lens groups (LG1, LG4) can be arranged at fixed positions. In each of the first position, the second position, and the third position according to the operation mode, the first to fourth lens groups (LG1, LG2, LG3, LG4) can have a set gap from adjacent lens groups. Accordingly, the optical system (1000) can have constant TTL and BFL depending on the operation mode, and the effective focal length and magnification of the optical system (1000) can be controlled by controlling the positions of some lens groups.

[0281] The effective length (CA1) of the first lens (121) is the largest among the lenses, and the effective length (CA7) of the seventh lens (127) is the smallest among the lenses. The effective length (CA1) of the first lens (121) may be 5.8 mm or more. The effective length (CA6) of the sixth lens (126) may be less than 5 mm.

[0282] At least one of the curvature radii of the fifth surface (S5) and the sixth surface (S6) of the third lens (123) on the optical axis may be 50 mm or more. The third lens (123) may be provided with a large curvature radius on the object-side surface and the sensor-side surface and a thin thickness of 0.5 mm or less, so that the central thickness and shape of the fourth lens (124) can be adjusted, and light loss due to changes in the gap between the fourth and fifth lenses (124, 125) can be reduced. In addition, among the lenses, the lens surfaces having the smallest difference in the radii of curvature (absolute value) between adjacent lens surfaces are the eighth surface (S8) and the ninth surface (S9).

[0283] The absolute value difference in the radius of curvature between the 13th surface (S13) and the 14th surface (S14) of the seventh lens (127) on the optical axis may be the smallest among the differences in the radius of curvature (absolute value) between the object-side surface and the sensor-side surface of each lens, and may be, for example, 3 mm or less. Since the center thickness (CT7) of the seventh lens (127) is 2 mm or more and the difference in the radius of curvature (absolute value) of both sides is provided to be small, the light can be guided to the 9th lens (129) without causing a large change in the path of the incident light.

[0284] In the absolute value of the focal length, the focal length (F3) of the third lens (123) may be the largest among the lenses, and the difference (absolute value) in the focal length between adjacent two lenses may be the largest for the third and fourth lenses (123, 124), and the difference (absolute value) in the focal lengths of the sixth and seventh lenses (126, 127) may be the smallest. The focal lengths of the first to ninth lenses (121-129) may satisfy the following conditions.

[0285] Condition 1: F1*3 < F2 < │F3│

[0286] Condition 2: F2*2 < │F3│ < F2*5

[0287] Condition 3: 0 < (│F6│ - F7) ≤ (│F4│ -F5) < 4mm

[0288] Condition 4: │F6│ < F9 < F1

[0289] Condition 5: (F1 + │F4│ + F5 + │F8│) < F2

[0290] Condition 6: (│F4│ - │F8│) < (F1 - F9)

[0291]

[0292] The central thickness (CT5) of the fifth lens (125) may be the thickest among the central thicknesses of the lenses, and at least one of the central thicknesses (CT3, CT4) of the third and fourth lenses (123, 124) may be the thinnest among the central thicknesses of the lenses. For example, the central thickness (CT4) of the fourth lens (124) may be equal to or greater than the central thickness (CT3) of the third lens (123).

[0293] The sum of the central thicknesses of the lenses of the second lens group (LG2) may be greater than the sum of the central thicknesses of the lenses of the first lens group. The sum of the central thicknesses of the lenses of the second lens group (LG2) may be greater than the sum of the central thicknesses of the lenses of the third lens group (LG3). Accordingly, the second lens group (LG2) may guide the light incident through the first lens group (LG1) to the effective area of ​​the third lens group (LG3). The optical axis spacing between the first to fourth lens groups (LG1 to LG4) will refer to the description of the first embodiment, and the relationships between DG12, DG23, and DG34 according to the first to third modes are as follows.

[0294] Mode 1: DG34 < DG23 < DG12

[0295] Mode 2: DG34 < DG23 < DG12

[0296] Mode 3: DG12 < DG23 < DG34

[0297] Depending on the operating mode, the F number of the optical system (1000) provides a brightness of 4.5 or less, and the F number may range from 2.2 to 4.5. The aperture may be positioned between the first lens group (LG1) and the second lens group (LG2), and may be arranged, for example, around the ninth surface (S9) of the fifth lens (125).

[0298]

[0299] Tables 5 and 6 and FIG. 22 are for the items of the mathematical formulas described above in the optical system (1000) of the third embodiment, and Table 5 shows the TTL of the optical system (1000), the focal length of each lens group, BFL, ImgH (mm), and TD (mm), which is the optical axis distance from the first surface (S1) to the sixteenth surface (S16).

[0300] Item Example 2 Item Example 2 FLG1 (mm) - 19.925 ImgH (mm) 3.2 FLG2 (mm) 7.014 TTL (mm) 24.90 FLG3 (mm) - 9.13 BFL (mm) 1.00 FLG4 (mm) 16.030 TD (mm) 23.90

[0301] Table 6 can represent the effective focal length (F), field of view (FOV), F number, entrance pupil size (EPD), SD, and center spacing (DG12, DG23, DG34) between adjacent lens groups according to the first to third modes in the optical system according to the third embodiment. The SD is the optical axis distance from the position of the aperture to the image sensor.

[0302] Example 3 Mode 1 Mode 2 Mode 3 F (mm) 13.50 17.00 27.40 DG 12 (mm) 5.84 84.43 71.110 DL G 23 (mm) 4.34 33.97 64.43 3 D G 34 (mm) 1.43 23.21 6.08 EPD (EPD1 / EPD2 / EPD3) 5.00 05.31 36.227 Fno (Fno1 / Fno2 / Fno3) 2.70 03.20 04.400 FOV (degrees) 20.66 16.45 10.13 SD 14.02 15.43 18.76

[0303]

[0304] As shown in Fig. 24, the optical system according to the third embodiment can have MTF characteristics according to the first, second, and third modes (Wide, Mid, Tele mode). In detail, Fig. 24 is a graph of the diffraction MTF characteristics of the optical system (1000) operating in the first to third modes, and it can be seen that the change in the position of defocusing according to the operating mode is not large.

[0305] FIGS. 25 to 27 are graphs measuring spherical aberration (longitudinal spherical aberration), astigmatic field curves, and distortion from left to right in an aberration graph of an optical system according to a third embodiment. In FIGS. 16 to 18, the X-axis may represent a focal length (mm) and a degree of distortion (%), and the Y-axis may represent the height of the image. In addition, the graph for spherical aberration is a graph for light in wavelength bands of about 435 nm, about 486 nm, about 546 nm, about 587 nm, and about 656 nm, and the graphs for astigmatic aberration and distortion aberration are graphs for light in wavelength bands of 546 nm. In the aberration diagram, 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 aberration change according to the operation mode (wide, mid, tele mode) is not large.

[0306]

[0307] The optical system (1000) according to the first to third embodiments can satisfy at least one or two or more of the mathematical equations described below. Accordingly, the optical system (1000) according to the first to third embodiments can effectively correct aberrations that change according to changes in the operation mode. The optical system (1000) can adjust the zoom magnification for a subject at various magnifications and can have a slim and compact structure.

[0308] Hereinafter, the optical axis spacing between adjacent two lenses can be defined as CG1-CG8 from the spacing between the first lens (101, 111, 121) and the second lens (102, 112, 122) to the spacing between the eighth lens (108, 118, 128) and the ninth lens (109, 119, 129). The effective lengths of the object-side and sensor-side surfaces of the first lens (101, 111, 121) to the major axis effective lengths of the object-side and sensor-side surfaces of the ninth lens (109, 119, 129) can be defined as CA11, CA12 to CA91, CA92. The units of the thickness, spacing, and effective diameter values ​​are mm. In addition, the effective length includes a circular or non-circular shape of the lens surface, and can be defined as the major axis effective length or the maximum effective length when the lens has a partially circular shape.

[0309] [Mathematical Formula 1] 3 ≤ nLG1

[0310] In mathematical expression 1, nLG1 represents the number of lenses included in the first lens group (LG1). Here, the relationships nLG1 > nLG2 and nLG3 > nLG4 may be present.

[0311] [Mathematical Formula 2] 0.5 < CA1 / CA9 < 1.5

[0312] In mathematical expression 2, CA1 is an average of the effective lengths of the object-side surface and the sensor-side surface of the first lens, and CA9 is an average of the effective lengths of the object-side surface and the sensor-side surface of the eighth lens. Preferably, 1 < CA1 / CA9 < 1.5 can be satisfied. The effective lengths of the first and ninth lenses are lengths in the major axis direction. The first lens may have different effective lengths in the first and second directions at the center of the object-side surface. The first lens may have different effective lengths in the first and second directions at the center of the sensor-side surface. The ninth lens may have different effective lengths in the first and second directions at the center of the object-side surface. The ninth lens may have different effective lengths in the first and second directions at the center of the sensor-side surface.

[0313] [Mathematical Formula 3] 1 < CT1 / CT3 < 3

[0314] In mathematical expression 3, the central thickness (CT1) of the first lens (101, 111, 121) is greater than the central thickness (CT3) of the third lens (103, 113, 123), and when this is satisfied, the aberration characteristics in the optical system (1000) can be improved. Preferably, 1.5 < CT1 / CT3 < 2.5 can be satisfied.

[0315]

[0316] [Equation 4] 0 < CT1 / CT5 < 1

[0317] In mathematical expression 4, the central thickness (CT1) of the first lens (101, 111, 121) may be smaller than the central thickness (CT5) of the fifth lens (105, 115, 125), and when this is satisfied, the optical system (1000) may improve aberration characteristics. Preferably, 0.2 < CT1 / CT5 < 0.5 may be satisfied.

[0318] [Mathematical Formula 5] 0 < L1R1*L1R2

[0319] L1R1 is the radius of curvature of the object-side surface of the first lens (101, 111, 121), and L1R2 is the radius of curvature of the sensor-side surface of the first lens. When the optical system satisfies mathematical expression 5, the amount of incident light can be increased, and for example, the incidence efficiency of reflected light in the entire area of ​​the reflective member can be improved. In addition, L1R1 < L1R2 can be satisfied. Accordingly, an increase in the center spacing between the first and second lenses can be prevented.

[0320] [Equation 6] FLG1 < 0

[0321] In mathematical expression 6, FLG1 is the effective focal length (EFL) of the first lens group (LG1) and can have a value less than 0. FLG1 is the composite focal length of the first to fourth lenses. When mathematical expression 6 is satisfied, the optical aberration of the optical system, i.e., the optical aberration of the first lens group (LG1), can be improved. When the focal lengths of the second to fourth lens groups are FLG2, FLG3, and FLG4, 0 < FLG2, FLG3 < 0, and 0 < FLG4 can be satisfied.

[0322] [Mathematical Formula 7] 1° < CRA < 20°

[0323] In mathematical expression 7, CRA (Chief Ray Angle) is the chief ray incident angle. In the optical system, the incident angle of the chief ray may be less than 20 degrees at most, and may be 15 degrees or less, depending on the first, second, and third modes. 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. When mathematical expression 6 is satisfied, the peripheral light ratio can be secured.

[0324] [Equation 8] 3.5 < (TTL / DLG1)

[0325] In mathematical expression 8, DLG1 is the optical axis distance of the first lens group (LG1), for example, the optical axis distance from the center of the object-side surface of the first lens (101, 111, 121) to the center of the sensor-side surface of the third lens (103, 113, 123). DLG1 refers to the distance from the optical axis (OA) of the first surface (S1) of the first lens (101, 111, 121) to the eighth surface (S8) of the fourth lens (104, 114, 124). TTL refers to the distance from the object-side first surface (S1) of the first lens (101, 111, 121) to the upper surface of the image sensor (300) on the optical axis (OA). When the optical system (1000) satisfies mathematical expression 8, the optical system (1000) has a relatively small TTL and can secure a peripheral light ratio.

[0326] The following mathematical formulas may be further included.

[0327] [Mathematical Formula 8-1] (TTL / DLG1) < (TTL / DLG2)

[0328] [Equation 8-2] DLG3 < DLG2

[0329] Here, DLG2 is the optical axis distance of the second lens group (LG2), and is the distance from the center of the object-side surface of the fifth lens to the center of the sensor-side surface of the sixth lens. DLG3 is the optical axis distance of the third lens group (LG3), and is the distance from the center of the object-side surface of the seventh lens to the center of the sensor-side surface of the eighth lens.

[0330] [Equation 9] 2 < TTL / EPD3 < 7

[0331] In mathematical expression 9, EPD3 refers to the size of the entrance pupil (EPD) of the optical system (1000) when operating in the third mode, i.e., Tele mode. When the optical system (1000) satisfies mathematical expression 9, the optical system (1000) can secure a bright image when operating in the third mode, and may be a minimum condition for securing an F number of 4.5 or less in Tele mode. Preferably, 3 < TTL / EPD3 < 5 can be satisfied.

[0332] [Equation 9-1] 3 < TTL / EPD1 < 7

[0333] [Equation 9-2] 3.5 < TTL / EPD2 < 6

[0334] In mathematical expressions 9-1 and 9-2, EPD1 is the size of the entrance pupil of the optical system in the first mode (Wide), and EPD2 is the size of the entrance pupil of the optical system in the second mode (Middle). When the optical system satisfies the above conditions, it can secure a bright image in each mode.

[0335]

[0336] [Equation 10] 2 < CT_Max / CT_Min < 8

[0337] In mathematical expression 10, CT_Max is the thickest thickness among the central thicknesses of the lenses, and CT_Min is the thinnest thickness among the central thicknesses of the lenses. If mathematical expression 10 is satisfied, the optical system aberration characteristics can be improved. Preferably, 4 < CT_Max / CT_Min < 6 can be satisfied.

[0338] [Mathematical Formula 11] 1 < CA_Max / CA_Min < 3

[0339] In mathematical expression 11, CA_Max is the largest effective length among each lens surface, and CA_Min is the smallest effective diameter among each lens surface. When mathematical expression 11 is satisfied, a camera module for a slim or compact structure can be provided while maintaining the optical performance of the optical system. Preferably, 1.2 < CA_Max / CA_Min < 1.8 can be satisfied.

[0340] [Equation 12] 0.3 < ΣCG / TTL < 0.8

[0341] In mathematical expression 12, ΣCG is the sum of the center spacings between adjacent lenses, and the sum of the center spacings according to the change in the first to third modes can be constant. When the optical system satisfies mathematical expression 12, the movement distance of the second and third lens groups (LG2, LG3) and the center spacing between adjacent lenses within each lens group can be set according to each mode. Preferably, 0.4 < ΣCG / TTL < 0.7 can be satisfied.

[0342] [Equation 13] 1 < DLG1 / DLG2 < 1.5

[0343] In mathematical expression 13, DLG1 is the optical axis distance of the first lens group (LG1), and DLG2 is the optical axis distance of the second lens group (LG2). By setting the optical axis distances of the first and second lens groups (LG1, LG2) in mathematical expression 13, TTL can be adjusted. Preferably, 1 < DLG1 / DLG2 < 1.3 can be satisfied.

[0344]

[0345] [Mathematical Formula 14] 0.5 < DLG2 / DLG3 < 1.5

[0346] In mathematical expression 14, DLG2 is the optical axis distance of the second lens group (LG2), and DLG3 is the optical axis distance of the third lens group (LG3). Preferably, 1 < DLG2 / DLG3 < 1.3 can be satisfied. When the optical system (1000) according to the embodiment satisfies at least one of mathematical expressions 13 and 14, it has a relatively small TTL and can provide various magnifications according to at least three mode changes.

[0347] [Equation 15] 0 < CG2 / TTL < 0.2

[0348] In mathematical expression 15, CG2 is the optical axis spacing between the second lens (102, 112, 122) and the third lens (103, 113, 123). When the optical system (1000) satisfies mathematical expression 15, the optical system (1000) has a relatively small TTL and can have improved optical characteristics by controlling stray light incident on the first lens group (LG1). Preferably, 0 < CG2 / TTL < 0.1 can be satisfied.

[0349] [Mathematical Formula 16] 2 < TTL / (DLG2+DLG3) < 5

[0350] Mathematical expression 16 sets the sum of the optical axis distances of the TTL and the second and third lens groups (LG2, LG3), and when the optical system (1000) satisfies Mathematical expression 16, the optical system (1000) has a relatively small TTL and can improve chromatic aberration characteristics. Preferably, 3 < TTL / (DLG2+DLG3) < 4.2 can be satisfied.

[0351] [Equation 17] 20 < |Vd5 - Vd4| < 60

[0352] In mathematical expression 17, Vd4 represents the Abbe number of the fourth lens (104, 114, 124), and Vd5 represents the Abbe number of the fifth lens (105, 115, 125). When the absolute value of the difference in Abbe numbers between the fourth and fifth lenses of the optical system (1000) according to the embodiment satisfies mathematical expression 17, the optical system (1000) can improve chromatic aberration characteristics. Preferably, Vd4 < Vd5 is satisfied, and 45 < Vd5 can be satisfied.

[0353] [Equation 18] 15 < |Vd8 - Vd9| < 60

[0354] In mathematical expression 18, Vd8 represents the Abbe number of the eighth lens, and Vd9 represents the Abbe number of the ninth lens. When the absolute value of the difference in Abbe numbers between the eighth and ninth lenses satisfies mathematical expression 18, the optical system (1000) can improve chromatic aberration characteristics. Preferably, Vd9 < Vd8 is satisfied, and 45 < Vd8 can be satisfied.

[0355] [Equation 19] 1.6 < Nd1

[0356] In mathematical expression 19, Nd1 represents the refractive index of the first lens (101, 111, 121) at the d-line. When the optical system (1000) according to the embodiment satisfies mathematical expression 19, the incident light can be dispersed, and the effective area of ​​the lens arranged on the sensor side relative to the first lens (101, 111, 121) can be secured. Preferably, 1.65 ≤ Nd1 can be satisfied.

[0357] [Equation 19-1] 1.6 < Nd3

[0358] [Equation 19-2] 1.6 < Nd6

[0359] [Equation 19-3] 1.6 < Nd7

[0360] [Equation 19-4] 1.6 < Nd9

[0361] The refractive indices of the above lenses 3, 6, 7, and 9 may be greater than 1.6. Among the above lenses, the number of lenses having a refractive index of 1.63 or greater may be 4 or more, for example, 5.

[0362] The refractive indices of the above-mentioned 2nd, 5th, and 8th lenses may be less than 1.6. Here, the product of the Abbe number of the 1st lens (101, 111, 121) and the Abbe number and refractive indices of the 8th lens (108, 118, 128) is as follows.

[0363] Condition 1: 20 < Nd1*Vd1 < 50

[0364] Condition 2: 20 < Nd9*Vd9 < 50

[0365] Condition 3: 20 < Ndn*Vdn < 50

[0366] Ndn and Vdn are the refractive index and Abbe number of the nth lens.

[0367]

[0368] [Mathematical Formula 20] 5 < L3R1 / L1R1 < 25

[0369] In mathematical expression 20, L1R1 denotes the radius of curvature of the object-side first surface (S1) of the first lens (101, 111, 121), and L3R1 denotes the radius of curvature of the object-side fifth surface (S5) of the third lens (103, 113, 123). When the optical system (1000) satisfies mathematical expression 20, the optical system (1000) can control stray light incident on the first lens group (LG1). Since the third lens (103, 113, 123) has a concave sensor-side surface on the optical axis, the effective diameter of the fourth lens (104, 114, 124) can be suppressed from increasing.

[0370] [Equation 20-1] 0.8 < CA32x / L3R2 < 1.5

[0371] CA32x is the maximum effective length of the sensor-side surface of the third lens in the first direction. Preferably, 0.9 ≤ CA32x / L3R2 < 1 can be satisfied.

[0372] [Mathematical Formula 21] 1 < L1R1 / L5R1 < 3.5

[0373] In mathematical expression 21, L1R1 denotes the radius of curvature of the object-side first surface (S1) of the first lens (101, 111, 121), and L5R1 denotes the radius of curvature of the object-side ninth surface (S9) of the fifth lens (105, 115, 125). When the optical system (1000) according to the embodiment satisfies mathematical expression 21, the optical system (1000) can have good optical performance at various magnifications. Preferably, 1.5 < L1R1 / L5R1 < 2.5 can be satisfied.

[0374] [Equation 22] 0.5 < L4R2 / L5R1 < 1.5

[0375] In mathematical expression 22, L4R2 denotes the radius of curvature of the sensor-side eighth surface (S8) of the fourth lens (104, 114, 124), and L5R1 denotes the radius of curvature of the object-side ninth surface (S9) of the fifth lens (105, 115, 125). When the optical system (1000) according to the embodiment satisfies mathematical expression 22, the optical system (1000) can have good optical performance at the periphery of the field of view (FOV) when operating at various magnifications of at least three modes. Preferably, 0.5 < L4R2 / L5R1 < 1 can be satisfied. The fifth lens (105, 115, 125) is the lens closest to the first lens group (LG1) in the second lens group (LG2), has a biconvex shape on the optical axis, and can have positive power. Accordingly, the area between the convex sensor-side surface of the fifth lens and the concave object-side surface of the sixth lens can be closely packed with a minimum gap.

[0376] [Equation 23] 0 < |L1R1 / L9R2| < 1.5

[0377] In mathematical expression 23, L9R1 represents the radius of curvature of the object-side 18th surface (S18) of the ninth lens (109, 119, 129). When the optical system (1000) satisfies mathematical expression 23, the optical system (1000) can have good optical performance in the center and periphery of the field of view (FOV). Preferably, 0.5 < |L1R1 / L9R2| < 1 can be satisfied.

[0378] [Equation 23-1] 10 < │L9R1 / L1R1│

[0379] In mathematical expression 23-1, the central thickness of the first lens (101, 111, 121) can be reduced by the small radius of curvature of the object-side surface of the first lens, the central thickness of the ninth lens can be increased by the large radius of curvature of the object-side surface of the ninth lens, and the light emitted through the ninth lens can be refracted toward the image sensor (300) in an almost parallel manner.

[0380]

[0381] [Equation 24] 5 < TTL / Md12_mLG2 < 20

[0382] In mathematical expression 24, Md12_mLG2 means the difference in the center spacing (unit: mm) after the movement of the second lens group (LG2) when changing from the second mode to the first mode or from the first mode to the second mode. In detail, the Md12_mLG2 represents the movement distance of the second lens group (LG2) in the first and second modes, and means the difference value 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 second mode. When the optical system (1000) satisfies mathematical expression 24, the optical system (1000) can minimize the movement distance of the second lens group (LG2) when the magnification is changed, so that the optical system (1000) can have a slim structure. In addition, the movement distance can be minimized when controlling the position of the second lens group (LG2), thereby providing improved power consumption characteristics. Preferably, 15 < TTL / Md12_mLG2 < 20 can be satisfied.

[0383] [Equation 25] 5 < TTL / Md23_mLG2 < 15

[0384] In mathematical expression 25, Md23_mLG2 refers to the difference in the center spacing (unit: mm) after movement of the second lens group (LG2) when operating from the second mode to the third mode, or from the third mode to the second mode. Specifically, Md23_mLG2 refers to the difference value between the optical axis spacing between the first and second lens groups (LG1, LG2) in the second mode and the optical axis spacing between the first and second lens groups (LG1, LG2) in the third mode. The maximum movement distance of the second lens group (LG2) may be greater than the maximum movement distance of the third lens group (LG3). When the optical system (1000) according to the embodiment satisfies mathematical expression 25, the optical system (1000) can minimize the movement distance of the second lens group (LG2) when the magnification is changed, so that the optical system (1000) can have a slim structure. In addition, the movement distance can be minimized when controlling the position of the second lens group (LG2), thereby providing improved power consumption characteristics. 5 < TTL / Md23_mLG2 < 10 can be satisfied.

[0385] [Mathematical Formula 26] 0.3 < Md12_mLG2 / DLG2 < 1

[0386] Mathematical expression 26 can set the movement distance of the second lens group (LG2) and the optical axis distance (DLG2) of the second lens group (LG2). When the optical system (1000) satisfies Mathematical expression 26, the optical system (1000) can minimize the movement distance of the second lens group (LG2) when the magnification is changed, so that the optical system (1000) can have a slim structure. In addition, the movement distance can be minimized when controlling the position of the second lens group (LG2), so that it can have improved power consumption characteristics. Preferably, 0.25 < Md12_mLG2 / DLG2 < 0.5 can be satisfied.

[0387] [Equation 27] 0.5 < Md23_mLG3 / DLG3 < 1.5

[0388] In mathematical expression 27, Md23_mLG3 refers to the difference in the center spacing after the movement of the third lens group (LG3) when changing from the second mode to the third mode, or from the third mode to the second mode. When the optical system (1000) satisfies mathematical expression 27, the optical system (1000) can minimize the movement distance of the third lens group (LG3) when the magnification is changed, so that the optical system (1000) can have a slim structure. In addition, the movement distance can be minimized when controlling the position of the third lens group (LG3), so that it can have improved power consumption characteristics. Preferably, 0.7 < Md23_mLG3 / DLG3 < 1 can be satisfied.

[0389] [Equation 28] 0 < Md23_mLG3 / TTL < 0.5

[0390] In mathematical expression 28, Md23_mLG3 refers to the difference in the center spacing (unit: mm) 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 refers to the difference value 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. When the optical system (1000) satisfies mathematical expression 25, the optical system (1000) can minimize the movement distance of the third lens group (LG3) when the magnification is changed, so that the optical system (1000) can have a slim structure. In addition, since the movement distance can be minimized when controlling the position of the third lens group (LG3), it can have improved power consumption characteristics. 0 < Md23_mLG3 / TTL < 0.2 can be satisfied.

[0391] [Equation 29] 1 < Md12_mLG3 / DLG4 < 3

[0392] In mathematical expression 29, the movement distance of the third lens group (LG3) and the optical axis distance of the fourth lens group (LG4) can be set. When the optical system (1000) satisfies mathematical expression 26, the optical system (1000) can minimize the movement distance (Md12_mLG3) of the third lens group (LG3) according to the change in magnification, so that the optical system (1000) can have a slim structure. In addition, since the movement distance can be minimized when controlling the position of the third lens group (LG3), it can have improved power consumption characteristics. Preferably, 1.5 < Md12_mLG3 / DLG3 < 2.5 can be satisfied.

[0393]

[0394] [Mathematical Formula 30] 1 < Md1(DG12 / DG23) < 5

[0395] In mathematical expression 30, Md1(DG12 / DG23) represents the ratio between the center spacing (DG12) between the first and second lens groups in the first mode and the center spacing (DG23) between the second and third lens groups. When the optical system (1000) according to the embodiment satisfies mathematical expression 30, the optical system (1000) may have improved optical characteristics at the first magnification. In detail, the optical system (1000) may have improved aberration characteristics at the first magnification, and may improve optical performance at the center and periphery of the field of view (FOV). Preferably, 1 < Md1(DG12 / DG23) < 1.6 may be satisfied.

[0396] [Mathematical Formula 31] 0.1 < Md3(DG12 / DG23) < 0.9

[0397] In mathematical expression 31, Md3(DG12 / DG23) represents the ratio between the center spacing (DG12) between the first and second lens groups in the third mode and the center spacing (DG23) between the second and third lens groups. When the optical system (1000) according to the embodiment satisfies mathematical expression 31, the optical system (1000) can have improved optical characteristics at the second magnification. In detail, the optical system (1000) can have improved aberration characteristics at the second magnification and improve the optical performance of the peripheral portion of the field of view (FOV). Preferably, 0.1 < Md3(DG12 / DG23) < 0.5 can be satisfied.

[0398] [Equation 32] 20 < Md_CG_Max / Md_CG_Min < 50

[0399] Md_CG_Max is the maximum center spacing between adjacent lenses when the second and third lens groups (LG2, LG3) move according to the first to third modes, and Md_CG_Min is the minimum center spacing between adjacent lenses. When mathematical expression 32 is satisfied, the center spacing between lenses in an optical system having a variable lens group can be set, and the moving distance can be adjusted.

[0400] [Mathematical Formula 33] 1mm < Max_mMd13 < 7mm

[0401] Max_mMd13 represents the maximum movement distance when the second and third lens groups move from the first mode to the third mode or from the third mode to the first mode. When the optical system satisfies mathematical expression 33, the power consumption of the driving member can be reduced. Preferably, 4 mm < Max_mMd13 < 5.5 mm can be satisfied.

[0402] [Equation 34] 5 < TTL / Max_mLG2 < 5.6

[0403] Max_mLG2 is the maximum travel distance of the second lens group (LG2). If the optical system satisfies Equation 34, the power consumption according to the travel distance of the second lens group (LG2) can be reduced compared to TTL.

[0404] [Equation 35] 5 < TTL / Max_mLG3 < 5.6

[0405] Max_mLG3 is the maximum travel distance of the third lens group (LG3). If the optical system satisfies Equation 35, the power consumption according to the travel distance of the third lens group (LG3) can be reduced compared to TTL.

[0406] [Mathematical Formula 36] 1mm ≤ Md3_DG12 < 1.5mm

[0407] Md3_DG12 is the center spacing between the first and second lens groups when in the third mode. When the optical system satisfies mathematical expression 36, when in the tele mode in which the first and second lens groups (LG1, LG2) have the closest center spacing, the center spacing between the first and second lens groups (LG1, LG2) can be made 1 mm or more, thereby reducing the power consumption of the driving member and suppressing light loss.

[0408] [Equation 37] LG1_Vd4 < 35

[0409] LG1_Vd4 is the Abbe number of the last lens in the first lens group, for example, the Abbe number of the fourth lens. If the optical system satisfies Equation 37, it can correct aberration characteristics or correct aberration characteristics that change due to movement of other lens groups.

[0410] [Equation 38] 53 < LG2_Vd1

[0411] LG2_Vd1 is the Abbe number of the fifth lens in the second lens group. If the optical system satisfies Equation 38, the aberration characteristics caused by the fifth and sixth lenses can be corrected.

[0412] [Equation 39] 1.6 < LG4_Nd1

[0413] LG4_Nd1 is the refractive index of the lens of the fourth lens group, for example, the refractive index of the ninth lens. When the optical system satisfies mathematical expression 39, the chromatic dispersion can be adjusted to cover a BFL of 2.5 mm or less, thereby irradiating light to the entire area of ​​the image sensor (300).

[0414]

[0415] [Equation 40] 20 < Aver_Vd < 50

[0416] In mathematical expression 40, Aver_Vd is the average Abbe number of the first to ninth lenses. When the optical system satisfies mathematical expression 40, the optical system (1000) can have improved aberration characteristics and resolution. Preferably, 25 < Aver_Vd < 35 can be satisfied.

[0417] [Equation 41] 1.5 < Aver_Nd < 1.8

[0418] In mathematical expression 40, Aver_Nd is the average refractive index of the first to ninth lenses. When the optical system satisfies mathematical expression 41, the optical system (1000) can have improved aberration characteristics and resolution. Preferably, 1.55 < Aver_Nd < 1.65 can be satisfied.

[0419] [Equation 41-1] 10 < ΣVd / ΣNd < 30

[0420] In mathematical expression 41-1, ΣVd means the sum of the Abbe numbers of each of the plurality of lenses. ΣNd means the sum of the refractive indices of each of the plurality of lenses. When the optical system (1000) according to the embodiment satisfies mathematical expression 41-1, the optical system (1000) can have improved aberration characteristics and resolution. Preferably, mathematical expression 41-1 can satisfy 17 < ΣVd / ΣNd < 25.

[0421] [Equation 42] 2 < │ FLG1 / FLG2 │ < 4

[0422] In mathematical expression 42, FLG1 represents the effective focal length (EFL) of the first lens group (LG1), and FLG2 represents the effective focal length of the second lens group (LG2). FLG2 is the composite focal length of the fifth and sixth lenses. If mathematical expression 42 is satisfied, the size of the optical system can be reduced, for example, the total track length (TTL) can be reduced.

[0423] [Mathematical Formula 43] 1 < FMd3 / FMd1 < 3

[0424] In mathematical expression 43, FMd1 is the effective focal length of the optical system in the first mode, and FMd3 is the effective focal length of the optical system in the third mode. Preferably, 1.5 < FMd3 / FMd1 < 2.5 can be satisfied. When the optical system satisfies mathematical expression 43, the effective focal length can be adjusted according to the first and third modes.

[0425] [Equation 44] 2 < FMd2 / EPD2 < 6

[0426] In mathematical expression 44, FMd2 is the effective focal length of the optical system in the second mode (Middle), and EPD2 refers to the size of the entrance pupil of the optical system (1000) in the second mode. When the optical system (1000) according to the embodiment satisfies mathematical expression 44, the optical system (1000) can secure a bright image when operating in the second mode. Preferably, 2 < FMd2 / EPD2 < 4 can be satisfied.

[0427] [Mathematical Formula 45] 1 < FMd1 / EPD1 < 4

[0428] In mathematical expression 34, FMd1 is the effective focal length of the optical system in the first mode (Wide), and EPD1 refers to the size of the entrance pupil of the optical system (1000) when operating in the first mode. When the optical system (1000) according to the embodiment satisfies mathematical expression 45, the optical system (1000) can secure a bright image when operating in the first mode. Preferably, 2 < FMd1 / EPD1 < 3.5 can be satisfied.

[0429] [Mathematical Formula 46] FMd1 < FMd12 < FMd3

[0430] In mathematical expression 46, FMd1, FMd2, and FMd3 represent the effective focal lengths of the optical system in the first, second, and third modes.

[0431] [Mathematical Formula 47] 1 < TTL / FMd2 < 2

[0432] Mathematical expression 47 can adjust TTL by comparing the effective focal length in TTL and the second mode. Preferably, 1.2 < TTL / FMd2 < 1.7 can be satisfied.

[0433] [Mathematical Formula 48] 1 < TTL / FMd1 < 3

[0434] Mathematical expression 47 can adjust TTL by comparing the effective focal length in TTL and the first mode. Preferably, 1.5 < TTL / FMd1 < 2.5 can be satisfied.

[0435]

[0436] [Equation 49] 1 < CA_Max / ImgH < 3

[0437] In mathematical expression 49, CA_Max refers to the largest effective length (CA) among the lens surfaces of the plurality of lenses included in the optical system (1000). ImgH refers to the distance from the 0 field area of ​​the image surface center of the image sensor (300) overlapping with the optical axis (OA) to the 1.0 field area of ​​the image sensor (300). The ImgH refers to half of the maximum diagonal length of the effective area of ​​the image sensor (300). When the optical system (1000) according to the embodiment satisfies mathematical expression 49, the optical system (1000) can be provided in a slim and compact manner. In addition, the optical system (1000) can implement high resolution and high image quality. The range of the ImgH is greater than 2 mm, for example, 2.5 mm to 3.5 mm. Here, the effective lengths (CA1-CA9) of the first to ninth lenses (101-109) can satisfy the following conditions.

[0438] Condition 1: (Imgh*2) < CA1

[0439] Condition 2: (Imgh*2) < CA2

[0440] And, conditions: (Imgh*2) < CA3, (Imgh*2) < CA4, (Imgh*2) < CA5, (Imgh*2) < CA6, (Imgh*2) < CA7, (Imgh*2) < CA8, and (Imgh*2) < CA9 can be satisfied at least one or all of them. CA1-CA8 are the averages of the maximum effective lengths of the object-side surface and the sensor-side surface of each of the first to ninth lenses.

[0441]

[0442] [Mathematical Formula 50] 5 < TTL / ImgH < 12

[0443] When the optical system (1000) satisfies mathematical expression 39, the optical system (1000) can have a smaller TTL, so that the optical system (1000) can be provided in a slim and compact manner. Preferably, it can be in the range of 6 < TTL / ImgH < 10.

[0444] [Equation 51] 0 < BFL / ImgH < 1

[0445] When the optical system (1000) according to the embodiment satisfies mathematical expression 51, it is possible to secure BFL required for a high-pixel (e.g., 48 Mega or more) or 2-inch or larger image sensor. In addition, when the optical system (1000) satisfies mathematical expression 51, the optical system (1000) can operate at various magnifications while maintaining TTL, and can have excellent optical characteristics at the center and periphery of the field of view (FOV).

[0446] [Equation 52] 2 < FMd1 / ImgH < 6

[0447] When the optical system (1000) according to the embodiment satisfies mathematical expression 52, the effective focal length of the first mode can be set according to the effective length of the image sensor. Preferably, 3 < FMd1 / ImgH < 5 can be satisfied.

[0448] [Equation 53] 6 < FMd3 / ImgH < 12

[0449] When the optical system (1000) according to the embodiment satisfies mathematical expression 53, the effective focal length of the third mode can be set according to the effective length of the image sensor. Preferably, 7 < FMd3 / ImgH < 9 can be satisfied.

[0450] [Mathematical Formula 54] 2mm < ImgH

[0451] Mathematical expression 56 can set half of the diagonal length of the image sensor (300) and provide the size of the image sensor of the zoom magnification optical system. Mathematical expression 54 can preferably satisfy 2.5 mm < ImgH < 3.5 mm.

[0452]

[0453] [Mathematical Formula 55] 10mm < F < 40mm

[0454] F is a range of the minimum effective focal length and the maximum effective focal length according to the first to third modes, and preferably satisfies 15.0 mm ≤ F ≤ 32 mm.

[0455] [Mathematical Formula 56] TTL < 30mm

[0456] TTL (Total track length) refers to the distance from the center of the first surface (S1) of the first lens (101, 111, 121) to the surface of the image sensor (300) on the optical axis (OA). In mathematical expression 55, by setting the TTL to exceed 10 mm, a zoom magnification optical system can be provided. Preferably, 15 mm < TTL < 28 mm can be satisfied.

[0457] [Mathematical Formula 57] 3mm < EPD1 < EPD2 <EPD3 < 9mm

[0458] Mathematical expression 59 represents the range of the entrance pupils (EPD1, EPD2, EPD3) of the optical system (1000) according to the change of the first to third modes.

[0459] [Mathematical Formula 58] 8° < FOV3 < FOV2 < FOV1 < 45°

[0460] In mathematical expression 58, FOV (Field of view) means the angle of view (Degree) in the diagonal direction of the optical system (1000), FOV1 is the angle of view in the first mode, FOV2 is the angle of view in the second mode, and FOV3 represents the angle of view in the third mode, and can be set in the order of the angles of wide, middle, and tele modes depending on the operation mode. Preferably, 8° < FOV < 30° can be satisfied.

[0461] [Equation 59] 0.5 < TD / TTL < 1

[0462] TD is the optical axis distance from the center of the object-side surface of the first lens to the center of the sensor-side surface of the eighth lens. If the optical system satisfies Equation 59, the size of TD can be set relative to TTL.

[0463] [Equation 60] 0.5 < SD1 / TTL < 1

[0464] SD1 is the optical axis distance from the aperture position to the surface of the image sensor in the first mode (Wide mode). When the optical system satisfies Equation 60, the amount of light passing between the lenses can be controlled by setting the aperture position.

[0465] [Mathematical Formula 61] 10mm < SD1 < SD2 < SD3 < 25mm

[0466] SD2 is the optical axis distance from the position of the aperture to the surface of the image sensor in the second mode (Middle mode). SD3 is the optical axis distance from the position of the aperture to the surface of the image sensor in the third mode (Tele mode). When the optical system satisfies Equation 61, the amount of light passing between the lenses can be controlled by the aperture whose position varies depending on each mode.

[0467] [Equation 62] 1 < SD3 / SD1 < 2

[0468] If the optical system satisfies mathematical expression 62, the range according to the maximum distance change of the aperture can be set, thereby controlling the amount of light from wide mode to tele mode.

[0469] [Equation 63] 0 < BFL / TTL < 0.5

[0470] If the optical system satisfies mathematical expression 63, the optical axis distance between the last lens and the image sensor can be set.

[0471]

[0472] [Equation 64] 10 < TD / BFL

[0473] When the optical system satisfies Equation 64, the optical axis distance (BFL) between the last lens and the image sensor can be set, and the TTL can be reduced. Preferably, 15 < TD / BFL < 30 can be satisfied.

[0474] [Mathematical Formula 65] 0.8mm < BFL < 3mm

[0475] When the optical system satisfies mathematical equation 65, the optical axis distance (BFL) between the last lens and the image sensor can be set narrowly, and the TTL can be reduced. In addition, the distance between the optical filter (500) and the image sensor (300) can be reduced. Preferably, 0.8 mm < BFL ≤ 2.5 mm can be satisfied.

[0476] [Equation 66] Md3_Fno < 4.6

[0477] Md3_Fno is the F-number of the optical system in the third mode. If the optical system satisfies mathematical expression 66, it can provide a bright optical system.

[0478] [Equation 67] 0.55 < CA1y / CA1x < 0.98

[0479] CA1y is the average of the effective lengths of the object-side surface and the sensor-side surface in the second direction (Y) of the first lens (101, 111, 121), and CA1x is the average of the effective lengths of the object-side surface and the sensor-side surface in the first direction (X) of the first lens (101, 111, 121). When this mathematical expression 67 is satisfied, the length of the first lens having the maximum effective length in the first direction can be reduced, thereby providing a slim optical system and camera module in the first direction.

[0480] [Equation 68] (CA21y / CA21x) < (CA22y / CA22x)

[0481] CA21x, CA21y are the effective lengths of the object-side surfaces of the second lens (102, 112, 122) in the first and second directions (X, Y), and CA22x, CA22y are the effective lengths of the sensor-side surfaces of the second lens (102, 112, 122) in the first and second directions (X, Y). When this mathematical expression 68 is satisfied, the length or area of ​​the object-side surface of the second lens can be set to be smaller than the length or area of ​​the sensor-side surface.

[0482]

[0483] [Equation 69] (CA61y / CA61x) < (CA62y / CA62x)

[0484] CA51x, CA51y are the effective lengths of the object-side surfaces of the fifth lens (105, 115, 125) in the first and second directions (X, Y), and CA52x, CA52y are the effective lengths of the sensor-side surfaces of the fifth lens (105, 115, 125) in the first and second directions (X, Y). When this mathematical expression 69 is satisfied, the length or area of ​​the object-side surface of the fifth lens can be set to be equal to or smaller than the length or area of ​​the sensor-side surface.

[0485] [Equation 70] 0.55 < (CA9y / CA9x) < 0.98

[0486] CA9x and CA9y are the effective lengths of the ninth lens in the first and second directions (X, Y). When this mathematical expression 70 is satisfied, the effective lengths of the object-side surface or the sensor-side surface of the ninth lens in the first and second directions can be set differently.

[0487] [Equation 71]

[0488]

[0489] In mathematical expression 71, Z may represent Sag, which is the distance from an arbitrary position on an aspherical surface to the vertex of the aspherical surface in the direction of the optical axis. In addition, Y may represent the distance from an arbitrary position on the aspherical surface to the optical axis in the direction perpendicular to the optical axis. In addition, c may represent the curvature of the lens, and K may represent the conic constant. In addition, A, B, C, D, E, and F may represent aspheric constants from the 4th to the 14th order.

[0490]

[0491] The optical system (1000) according to the embodiment can satisfy at least one of the above-described mathematical expressions 1 to 70. Accordingly, the optical system (1000) and the camera module can have improved optical characteristics. Specifically, since the optical system (1000) satisfies at least one or two or more mathematical expressions of the above-described mathematical expressions 1 to 70, it can effectively correct optical characteristic degradation such as chromatic aberration, vignetting, diffraction effect, and deterioration of image quality in the peripheral area caused by movement of the lens group. In addition, the optical system (1000) 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.

[0492] Since the optical system (1000) according to the embodiment satisfies at least one or two or more of the above mathematical expressions 1 to 70, it can have improved assembly properties and a mechanically stable shape, and is provided with a slim structure, so that the optical system (1000) and the camera module including the same can have a compact structure. Tables 7 and 8 show the result values ​​for the above mathematical expressions 1 to 70 in the optical system (1000) according to the embodiment. Referring to Table 7, it can be seen that the optical system (1000) satisfies at least one, two or more, or three or more of the above mathematical expressions 1 to 35. In detail, it can be seen that the optical system (1000) according to the embodiment satisfies all of the above mathematical expressions 1 to 35. Accordingly, the optical system (1000) can have good optical performance at the center and the periphery of the field of view (FOV) and can have excellent optical characteristics.

[0493] Mathematical expression Example 1 Example 2 Example 3 13 ≤ nLG144420.5 < CA1 / CA9 < 1.51.1481.1481.14831 < CT1 / CT3 < 32.1041.8901.85740 < CT1 / CT5 < 10.3780.3610.35650 < L1R1*L2R1SatisfactorySatisfactory6FLG1 < 0-20.117-8.894-9.13170 < CRA < 20SatisfactorySatisfactory83.5 < (TTL / DLG1)6.1536.1226.17292 < TTL / EPD3 < 73.9994.0893.999102 < CT_Max / CT_Min < 85.5605.4705.423111< CA_Max / CA_Min <31.4761.4761.476120.3 < ΣCG / TTL < 0.80.5430.5360.539131 < DLG1 / DLG2 < 1.51.1311.0721.083140.5 < DLG2 / DLG3 < 1.51.1251.1761.168150 < CG1 / TTL < 0.20.0140.0140.013162 < TTL / (DLG2+DLG3) < 53.6863.5493.6021720 < |Vd5 - Vd4| <6029.00029.00029.0001815 < |Vd8 - Vd9| < 6036.60036.60036.600191.6 < Nd11.6701.6701.670205 < L3R1 / L1R1 < 2513.76016.3618.409211 < L1R1 / L5R1 < 3.52.0592.0582.057220.5 < L4R2 / L5R1 < 1.50.9590.9850.981230 < |L1R1 / L9R2| < 1.50.8340.8480.820245 < TTL / Md12_mLG2 < 2017.38418.32817.643255 < TTL / Md23_mLG2 < 157.4607.4537.484260.3 < Md12_mLG2 / DLG2 < 10.4000.3580.379270.5 < Md23_mLG3 / DLG3 < 1.50.9180.9010.900280 < Md23_mLG3 / TTL < 0.50.1170.1170.115291 < Md23_mLG3 / DLG4 < 32.1232.2292.158301< Md1 (DG12 / DG23) < 51.3211.3561.347310.1< Md3 (DG12 / DG23) < 0.90.2480.2460.2503220 < Md_CG_Max / Md_CG_Min < 5035.28435.46435.236331 < Max_mMd13 < 74.7704.7824.772345 < TTL / Max_mLG2 < 5.65.2205.2075.218355 < TTL / Max_mLG3 < 5.65.2485.3345.304.

[0494]

[0495] Referring to Table 8, it can be seen that the optical system (1000) satisfies at least one, two or more, or three or more of mathematical expressions 36 to 70. In detail, it can be seen that the optical system (1000) according to the embodiment satisfies all of mathematical expressions 35 to 70. Accordingly, the optical system (1000) can have good optical performance and excellent optical characteristics at the center and periphery of the field of view (FOV).

[0496] Mathematical Formula Example 1 Example 2 Example 3 361 ≤ Md3_DG12 < 1.5 1.112 1.100 1.110 37 LG1_Vd4 < 35 27.000 27.000 27.000 3853 < LG2_Vd 1 5 6.000 56.000 56.000 391.6 < LG4_Nd 1 1.67 1.67 1.67 4020 < Aver_Vd < 5 0 30.389 30.389 30.389 411.5 < Aver_Nd < 1.8 1.622 1.622 1.622 422 < │ FLG1 / FLG2 │ < 42.86 22.82 82 84 1431 < FMd3 / FMd1 < 32.0302.0302.030442 < FMd2 / EPD2 < 63.2003.2003.200451 < FMd1 / EPD1 < 42.7002.7002.70046FMd1 < FMd2 < FMd3SatisfiedSatisfiedSatisfied471 < TTL / FMd2 < 21.4651.4651.465481 < TTL / FMd1 < 31.8441.8441.844491 < CA_Max / ImgH < 31.9381.9381.938505 < TTL / ImgH < 127.7817.7817.781510 <BFL / ImgH < 10.3130.3130.313522 < FMd1 / ImgH < 64.2194.2194.219536 < FMd3 / ImgH < 128.5638.5638.563542 < ImgH3.2003.2003.2005510 < F < 40만족만족만족56TTL < 3024.90024.90024.900573 < EPD1 < EPD2 <EPD3 < 9만족만족만족588 < FOV3 <FOV2 < FOV1 < 45만족만족만족590.5 < TD / TTL < 10.9600.9640.960600.5 < SD1 / TTL < 10.5850.5840.5866110 < SD1 < SD2 < SD3 < 25만족만족만족621 < SD3 / SD1 < 21.3411.3431.338630 < BFL / TTL < 0.50.0400.0400.0406410 < TD / BFL23.90024.00923.900650.8 < BFL < 31.0001.0001.00066Md3_Fno < 4.64.4004.5004.400670.55 < CA1y / CA1x < 0.98SatisfiedSatisfiedSatisfied68CA21y / CA21x) < (CA22y / CA22x)SatisfiedSatisfiedSatisfied69CA61y / CA61x) < (CA62y / CA62x)SatisfiedSatisfiedSatisfied700.55 < CA9y / CA9x < 0.98SatisfiedSatisfied.

[0497]

[0498] Referring to FIG. 28, a camera module includes an optical system (1000) disclosed above, and the optical system (1000) may include a reflective member (400) facing a subject or object, a lens unit (100, 100A, 100B) having a plurality of lens groups (LG1-LG4), and an image sensor (300). The camera module may include a first driving member (DM1) that drives a second lens group (LG2), and a second driving member (DM2) that drives a third lens group (LG3). The reflective member (400) may be disposed on a path of light reflected on the subject. The reflective member (400) may be disposed closer to the subject than the lens unit (100, 100A, 100B). That is, the reflective member (400), the lens unit (100, 100A, 100B) and the image sensor (300) can be arranged in the order from the subject side to the upper side.

[0499] The above reflective member (400) can change the path of light incident from the outside. The reflective member (400) can include a right-angle prism. When the reflective member (400) includes a right-angle prism, the reflective member (400) can reflect the path of light incident on the camera module (1000) at a 90-degree angle. The reflective member (400) can change the path of light reflected on the subject in a set direction. For example, the reflective member (400) can reflect light incident on the reflective member (400) in a first direction (Y-axis direction) and change the path of the light to the optical axis direction (Z-axis direction), which is the direction in which the plurality of lenses of the lens unit (100, 100A, 100B) are arranged.

[0500]

[0501] When the above camera module includes the reflective member (400), it can be applied to a folded camera that can reduce the thickness of the camera module. The camera module is arranged parallel to the surface of the mobile terminal and can change light incident in a vertical second optical axis direction (OA2) into a first optical axis direction (OA1) that is parallel to the surface of the mobile terminal. Accordingly, the camera module (1000) including the lens unit (100, 100A, 100B) can have a low height in a direction perpendicular to the surface of the mobile terminal, and thus can have a thinner thickness within the mobile terminal, and thus the thickness of the device can also be thinner.

[0502] The third driving member (410) may be connected to the reflective member (400). The third driving member (410) may include at least one actuator. For example, the third driving member (410) may include at least one of a voice coil motor (VCM), a piezoelectric device, a shape memory alloy, and a MEMS device as an actuator. The third driving member (410) may move the reflective member (400) using the driving force of the actuator. For example, the third driving member (410) may tilt-control the reflective member (400) along a first axis or a second axis. In detail, the third driving member (410) may tilt-control the reflective member (400) along a second direction (Z-axis direction) as a rotation axis. In addition, the third driving member (410) can tilt-control the reflection member (400) about the rotation axis in the third direction (OA1, Z-axis direction). Accordingly, the camera module can compensate for shaking.

[0503]

[0504] The camera module includes a sensing unit (not shown) that detects shaking, and the sensing unit can detect rotation and position changes applied to the camera module. The sensing unit can include at least one of a sensor that detects a change in angular velocity, for example, a gyro sensor, and an acceleration sensor that detects a change in acceleration. The camera module can control the movement of the reflective member (400) by a control signal. In detail, when shaking occurs in the camera module, information about the shaking, such as the degree of rotation and position change of the sensors, can be detected, and compensation for the shaking can be performed. Accordingly, the camera module according to the embodiment can operate in wide mode, middle mode, and tele mode by the first and second driving members (DM1, DM2), and can effectively compensate for shaking due to rotation and shaking due to position change when photographing a subject. Accordingly, the camera module can have improved optical characteristics.

[0505]

[0506] Fig. 29 is a drawing illustrating a camera module according to an embodiment applied to a mobile terminal. Referring to Fig. 29, the mobile terminal (1) may include the camera module (10) disclosed in the embodiment on the rear side. As another example, the mobile terminal (1) may include the camera module disclosed in the embodiment on the front side. The camera module (10) may include an image capturing function. In addition, the camera module (10) may include at least one of an auto focus function, a zoom function, and an OIS function.

[0507] The camera module (10) can process still images or video frames obtained by the image sensor (300) in a shooting mode or a video call mode. The processed image frames can be displayed on a display unit (not shown) of the mobile terminal (1) and stored in a memory (not shown). In addition, although not shown in the drawing, the camera module may be further arranged on the front of the mobile terminal (1). For example, the camera module (10) may include a first camera module (10A) and a second camera module (10B). At this time, at least one of the first camera module (10A) and the second camera module (10B) may include the optical system (1000) described above. Accordingly, the camera module (10) may have a slim structure and may capture a subject at various magnifications.

[0508] The mobile terminal (1) may further include an auto-focus device (31). The auto-focus device (31) may include an auto-focus function using a laser. The auto-focus device (31) may be mainly used in conditions where the auto-focus function using the image of the camera module (10) is degraded, for example, at a close range of 10 m or less or in a dark environment. The auto-focus device (31) may include a light-emitting unit including a vertical cavity surface-emitting laser (VCSEL) semiconductor element, and a light-receiving unit that converts light energy into electrical energy, such as a photodiode.

[0509] The mobile terminal (1) may further include a flash module (33). The flash module (33) may include a light-emitting element that emits light therein. The flash module (33) may emit light in the visible light wavelength band. For example, the flash module (33) may emit white light or light of a color similar to white. However, the embodiment is not limited thereto, and the flash module (33) may emit light of various colors. The flash module (33) may be operated by the camera operation of the mobile terminal or by the user's control.

[0510] 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 just one embodiment. Furthermore, the features, structures, effects, etc. illustrated in each embodiment can be combined or modified and implemented in other embodiments by a person having ordinary skill in the art to which the embodiments pertain. Therefore, the contents related to such combinations and modifications should be interpreted as being included in the scope of the present invention. Although the embodiments have been described above, these are merely examples and do not limit the present invention. Those having ordinary skill in the art to which the present invention pertains will appreciate that various modifications and applications not illustrated above are possible without departing from the essential characteristics of the embodiments. For example, each component specifically shown in the embodiments can be modified and implemented. In addition, differences related to such modifications and applications should be interpreted as being included in the scope of the present invention defined in the appended claims.

Claims

1. A first lens group having first to fourth lenses; A second lens group having a fifth lens and a sixth lens; A third lens group having a seventh lens and an eighth lens; and Includes a fourth lens group having a ninth lens, The first to ninth lenses are aligned along the optical axis from the object toward the image sensor, The first to fourth lenses have a convex meniscus shape toward the object, A camera module in which at least one of the second lens group and the third lens group moves along the optical axis.

2. In paragraph 1, The first lens and the second lens have positive (+) refractive power, A camera module wherein the third lens and the fourth lens have negative (-) refractive power.

3. In paragraph 1, A camera module wherein the sum of the central thicknesses of the fifth lens and the sixth lens is greater than the sum of the central thicknesses of the first lens to the fourth lens.

4. In paragraph 1, A camera module wherein the first and third lens groups have negative (-) power.

5. In paragraph 1, A camera module wherein the second and fourth lens groups have positive (+) power.

6. In any one of paragraphs 1 to 5, The second and third lens groups move along the optical axis to perform a zoom magnification from wide mode to tele mode, The maximum movement distance of the second or third lens group according to the above zoom ratio is Max_mMd13, Mathematical formula: 1 mm < Max_mMd13 < 7mm Camera module that satisfies .

7. In paragraph 6, The minimum optical axis distance between the first lens group and the second lens group according to the above tele mode is Md3_DG12, Mathematical formula: 1.0mm ≤Md3_DG12 < 1.5mm Camera module that satisfies .

8. In any one of paragraphs 1 to 5, The radius of curvature of the object-side surface of the first lens closest to the object in the first lens group is L1R1, and the radius of curvature of the sensor-side surface is L1R2. Mathematical formula: L1R1 < L1R2 Camera module that satisfies .

9. In paragraph 8, A camera module in which at least one of the radius of curvature of the object-side surface and the sensor-side surface of the third lens is 50 mm or greater.

10. In any one of paragraphs 1 to 5, The effective length of the first lens in the first direction is CA1x, and the effective length in the second direction is CA1y. Mathematical formula: 0.55 < CA1y / CA1x < 0.98 Camera module that satisfies . A first lens group having 11.3 or more lenses; A second lens group arranged on the sensor side of the first lens group and having two or fewer lenses; A third lens group arranged on the sensor side of the second lens group and having two or fewer lenses; and A fourth lens group is arranged on the sensor side of the third lens group and includes two or fewer lenses, The lenses of the first to fourth lens groups are aligned along the optical axis from the object toward the image sensor, The first lens group and the third lens group have negative (-) power, In the first to fourth lens groups, the lens having the largest absolute value of refractive power is placed within the first lens group. The lens with the largest central thickness among the first to fourth lens groups is placed within the second lens group. Among the first to fourth lens groups, the lens having the maximum effective length has different effective lengths in the first and second directions passing through the centers of the object-side surface and the sensor-side surface. Among the first to fourth lens groups, the lens having the maximum effective length has different effective lengths in the first and second directions passing through the centers of the object-side surface and the sensor-side surface. A camera module in which at least two lenses among the first to fourth lens groups have different effective lengths in the first and second directions on the object-side surface or the sensor-side surface, and have a maximum effective length of at least 5.2 mm.

12. In paragraph 11, The lenses of the first lens group are more than twice the number of lenses of the second lens group and have a convex meniscus shape toward the object, A camera module in which the number of lenses of the first lens group is at least three times the number of lenses of the fourth lens group.

13. In paragraph 11 or 12, It includes an aperture arranged on the periphery between the first lens group and the second lens group, A camera module in which the aperture has a variable position along the optical axis within the camera module.

14. In paragraph 11 or 12, The second lens group and the third lens group are moved along the optical axis direction, A camera module in which the positions of the first lens group and the fourth lens group are fixed.

15. In paragraph 11 or 12, The optical axis distance of the first lens group is DLG1, The optical axis distance of the second lens group is DLG2, The optical axis distance of the third lens group is DLG3, Mathematical formula: 1 < DLG1 / DLG2 < 1.5 0.5 < DLG2 / DLG3 < 1.5 Camera module that satisfies .

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