Optical system and camera module

Abstract

An optical system according to an embodiment of the present invention comprises first to third lens groups arranged along an optical axis. The first lens group has negative (-) refractive power, the second lens group has positive (+) refractive power, and the third lens group has negative (-) refractive power. The first lens group includes a prismatic lens, the first lens group is a fixed group, and the second lens group and the third lens group are movable groups.

Description

Optical system and camera module

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

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

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

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

[0005] For example, research is being conducted using multiple imaging lenses with positive (+) or negative (-) refractive power to implement high-performance optical systems. However, when multiple lenses are included, the entire optical system may become larger, and there are problems in that it is difficult to obtain excellent optical characteristics and aberration characteristics.

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

[0007] Camera modules for close-range imaging have a shorter TTL compared to conventional camera modules. As another example, camera modules for long-range imaging have a longer TTL compared to conventional camera modules. However, since portable terminals have limited installation space for camera modules, it is difficult to mount camera modules for long-range imaging or camera modules capable of adjusting image magnification (zoom camera modules). Therefore, a new optical system capable of solving the aforementioned problems is required.

[0008] The embodiment aims to provide a zoom optical system and a camera module with improved optical characteristics.

[0009] An embodiment of the invention can provide an optical system that can be implemented in a small and compact manner.

[0010] An embodiment of the invention may provide an optical system in which the lengths of a first direction and a second direction of at least one lens among a plurality of lenses that is adjacent to the object side or adjacent to the outside of the terminal are different. That is, at least one or more of the lenses may provide an optical system in which the lengths of two mutually orthogonal directions are different.

[0011] An embodiment of the invention aims to provide an optical system applicable to a folded camera or teletype having a thin thickness or height.

[0012] To solve the above technical problem, an optical system according to an embodiment of the present invention includes first to third lens groups arranged along an optical axis, wherein the first lens group has a negative (-) refractive power, the second lens group has a positive (+) refractive power, the third lens group has a negative (-) refractive power, the first lens group includes a prism lens, the first lens group is a fixed group, and the second lens group and the third lens group are moving groups.

[0013] The stroke length of the second lens group may be smaller than the stroke length of the third lens group.

[0014] The lens positioned closest to the object side in the first lens group above may have a meniscus shape that is convex toward the object side from the optical axis.

[0015] The first lens group may include a first lens having a positive (+) refractive power, a second lens which is a prism lens, a third lens, a fourth lens, and a fifth lens, the second lens group may include a sixth lens having a positive (+) refractive power and a seventh lens having a negative (-) refractive power, and the third lens group may include an eighth lens having a positive (+) refractive power and a ninth lens having a negative (-) refractive power.

[0016] The third lens may have a positive (+) refractive power, the fourth lens may have a negative (-) refractive power, and the fifth lens may have a negative (-) refractive power.

[0017] The radius of curvature on the object side of the first lens may be larger than the radius of curvature on the sensor side of the first lens.

[0018] At the wide-angle end, the distance between the first lens group and the second lens group on the optical axis may be greater than the distance between the second lens group and the third lens group, and at the telephoto end, the distance between the first lens group and the second lens group on the optical axis may be smaller than the distance between the second lens group and the third lens group.

[0019] The following condition can be satisfied. <Condition> 2 < TD_LG2 / TD_LG3 < 3 (In the above condition, TD_LG2 is the length of the second lens group in the direction of the optical axis, and TD_LG3 is the length of the third lens group in the direction of the optical axis.)

[0020] The following condition can be satisfied. <Condition> 70 < F1 < 120 (In the above condition, F1 is the focal length of the first lens.)

[0021] To solve the above technical problem, an optical system according to an embodiment of the present invention includes first to ninth lenses arranged along an optical axis, wherein the second lens is a prism lens, the first lens has a positive (+) refractive power, the third lens has a positive (+) refractive power, the fourth lens has a negative (-) refractive power, the fifth lens has a negative (-) refractive power, the sixth lens has a positive (+) refractive power, the seventh lens has a negative (-) refractive power, the eighth lens has a positive (+) refractive power, and the ninth lens has a negative (-) refractive power.

[0022] The first lens group is a fixed group, and the second lens group and the third lens group may be moving groups.

[0023] The first lens above may have a meniscus shape that is convex toward the object side from the optical axis.

[0024] The radius of curvature on the object side of the first lens may be larger than the radius of curvature on the sensor side of the first lens.

[0025] The stroke length of the second lens group may be smaller than the stroke length of the third lens group.

[0026] The following condition can be satisfied. <Condition> 3 < TTL / ImgH < 6 (In the above condition, TTL is the optical axis distance from the vertex of the object side of the first lens to the top plane of the image sensor, and ImgH is the maximum diagonal length of the image sensor.)

[0027] The optical system and camera module according to the present embodiment have various magnifications and can have excellent optical characteristics when providing various magnifications. Specifically, the embodiment can have various magnifications by controlling a lens group having a set number of lenses and refractive power, a plurality of lenses having a set shape and focal length, and a moving distance of a moving lens group, and can provide an autofocus (AF) function for the subject.

[0028] In addition, each of the multiple lens groups can correct aberration characteristics or mutually complement aberration characteristics that change due to movement. Accordingly, the optical system according to the embodiment can minimize or prevent changes in chromatic aberration and aberration characteristics that occur when the magnification changes.

[0029] In addition, the effective focal length (EFL) can be controlled by moving only some of the lens groups among multiple lens groups, and the moving distance of the moving lens groups can be minimized. Accordingly, the embodiment can significantly reduce the moving distance of the lens groups when changing the magnification and minimize the power consumption required when moving the lens groups.

[0030] In addition, the optical system according to the present embodiment has enhanced optical characteristics and can have a large BFL (Back focal length), thereby providing an optical system suitable for a folded camera module.

[0031] FIG. 1 is a diagram showing the configuration of an optical system according to the present embodiment operating in a first mode.

[0032] FIG. 2 is a configuration diagram of an optical system according to the present embodiment operating in a second mode.

[0033] FIG. 3 is a configuration diagram of an optical system according to the present embodiment operating in a third mode.

[0034] FIG. 4 is a configuration diagram of an optical system according to the present embodiment operating in a fourth mode.

[0035] FIG. 5 is a configuration diagram of an optical system according to the present embodiment operating in a fifth mode.

[0036] FIG. 6 is a configuration diagram of an optical system according to the present embodiment operating in the sixth mode.

[0037] FIG. 7 is a table showing the aspherical coefficients of lenses in an optical system according to the present embodiment.

[0038] [Correction pursuant to Rule 91 07.01.2026]

[0039] [Correction pursuant to Rule 91 07.01.2026] FIG. 8 is a graph showing data on the aberration characteristics of the optical system according to the present embodiment operating in the first mode.

[0040] [Correction pursuant to Rule 91 07.01.2026] FIG. 9 is a graph showing data on the aberration characteristics of the optical system according to the present embodiment operating in the third mode.

[0041] [Correction pursuant to Rule 91 07.01.2026] FIG. 10 is a graph showing data on the aberration characteristics of the optical system according to the present embodiment operating in the fifth mode.

[0042] [Correction pursuant to Rule 91 07.01.2026] Fig. 11 is a drawing for explaining the D-cut lens of the present invention.

[0043] [Correction pursuant to Rule 91 07.01.2026] FIG. 12 is an example of a portable terminal having an optical system according to the present embodiment.

[0044] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0045] However, the technical concept of the present invention is not limited to some of the described embodiments but can be implemented in various different forms, and within the scope of the technical concept of the present invention, one or more of the components among the embodiments may be selectively combined or substituted.

[0046] In addition, terms used in this embodiment (including technical and scientific terms) may be interpreted in a sense that is generally understood by those skilled in the art to which this embodiment belongs, unless explicitly and specifically defined otherwise. Terms that are commonly used, such as terms defined in advance, may be interpreted in consideration of their meaning in the context of the relevant technology.

[0047] Furthermore, the terms used in this embodiment are for the purpose of describing the embodiment and are not intended to limit the invention.

[0048] In this specification, the singular form may include the plural form unless specifically stated otherwise in the text, and when described as "at least one of A and B and C (or more than one)," it may include one or more of all combinations that can be formed from A, B, and C.

[0049] In addition, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the present embodiment. These terms are used merely to distinguish the components from other components and are not intended to limit the essence, order, or sequence of the components.

[0050] And, where it is stated that a component is 'connected', 'combined', or 'connected' to another component, this may include not only cases where the component is directly 'connected', 'combined', or 'connected' to the other component, but also cases where it is 'connected', 'combined', or 'connected' due to another component located between the component and the other component.

[0051] Furthermore, when described as being formed or placed "above" or "below" each component, "above" or "below" includes not only cases where two components are in direct contact with each other, but also cases where one or more other components are formed or placed between the two components. Additionally, when expressed as "above" or "below," it may include the meaning of a downward direction as well as an upward direction relative to a single component.

[0052] In the description of the invention, "object side" may refer to a surface of the lens facing the object side with respect to the optical axis (OA), and "sensor side" may refer to a surface of the lens facing the imaging surface (image sensor) with respect to the optical axis. "Object side" may be the "object side," and "sensor side" may be the "image side." One surface of the lens being convex may refer to a convex shape in the optical axis or paraxial region, and one surface of the lens being concave may refer to a concave shape in the optical axis or paraxial region. The radius of curvature, center thickness, and optical axis spacing between lenses listed in the lens data table may refer to values ​​(unit, mm) in the optical axis. The vertical direction may refer to a direction perpendicular to the optical axis, and the end of the lens or lens surface may refer to the end of the effective area of ​​the lens through which incident light passes. The size of the effective diameter of the lens surface may have a measurement error of up to ±0.4 mm depending on the measurement method, etc. The above paraxial region refers to a very narrow region near the optical axis, and is a region where the distance of light rays from the optical axis (OA) is almost zero. Hereinafter, the term optical axis may include the center of each lens or a very narrow region near the optical axis.

[0053] The optical axis (OA) may refer to the central axis on the path of light where light incident from the second direction (Y-axis direction) by the prism lens (102) bends into the first direction (X-axis direction).

[0054]

[0055] The optical system (1000) according to the present embodiment may include a plurality of lens groups. Specifically, the optical system (1000) may include a plurality of lens groups, each including at least one lens. For example, the optical system (1000) may include a first lens group (LG1), a second lens group (LG2), a third lens group (LG3), and an image sensor (300) that are sequentially arranged from the object side toward the image sensor.

[0056] Each of the first to third lens groups (LG1, LG2, LG3) may have a positive (+) or negative (-) refractive power. The first lens group (LG1) and the second lens group (LG2) may have refractive powers of different signs. For example, the first lens group (LG1) may have a negative (-) refractive power, and the second lens group (LG2) may have a positive (+) refractive power. The second lens group (LG2) and the third lens group (LG3) may have refractive powers of different signs. For example, the second lens group (LG2) may have a positive (+) refractive power, and the third lens group (LG3) may have a negative (-) refractive power.

[0057] At least one of the first to third lens groups (LG1, LG2, LG3) may be provided to be movable in the direction of the optical axis (OA). By setting at least one lens group as a movable group, the stroke can be reduced. Specifically, two or more of the plurality of lens groups (LG1, LG2, LG3) may be provided to be movable, and the remaining lens groups may be fixed. In this embodiment, the first lens group may be placed in a fixed position, and the second lens group (LG2) and the third lens group (LG3) may be provided to be movable in the direction of the optical axis (OA).

[0058] The first lens group (LG1) may include a plurality of lenses. The first lens group (LG1) may include five lenses. The first lens group (LG1) may include a first lens (101), a prism lens (second lens (102)), a third lens (103), a fourth lens (104), and a fifth lens (105).

[0059] A plurality of lenses included in the first lens group (LG1) may have a set spacing. Specifically, the spacing between the plurality of lenses included in the first lens group (LG1) may remain constant and not change in the operation mode described later. For example, the spacing between the first lens (101), the second lens (102), the third lens (103), the fourth lens (104), and the fifth lens (105) may remain constant and not change according to the operation mode described later.

[0060] The first lens group (LG1) may include a prism lens. The optical system (1000) may reduce the first direction (X-axis direction) and the second direction (Y-axis direction) of the optical system (1000) by including a second lens (102) which is a prism lens. If the optical system (1000) does not include a prism lens, a plurality of lenses within the optical device including the optical system (1000) may be arranged to extend in a direction perpendicular to the surface of the optical device.

[0061] Accordingly, multiple lenses have a high height in a direction perpendicular to the surface of the optical device, and it may be difficult to form the thickness of the optical device into an ultra-thin shape. A prism lens can change light incident perpendicular to the plane of the optical device into a direction parallel to the surface of the optical device. That is, multiple lenses included in the optical system (1000) can be arranged to extend in a direction parallel to the surface of the optical device, and the optical device can be formed with a thin thickness.

[0062] A driving member (not shown) may be connected to a prism lens. The driving member may include at least one actuator. For example, the driving member may include at least one of a VCM (Voice Coil Motor), a piezo-electric device, a shape memory alloy, or a MEMS device as the actuator. The driving member can move the prism lens using the driving force of the actuator. For example, the driving member can tilt the prism lens along a first axis (X-axis) or a second axis (Y-axis). Accordingly, the camera module (1520) can correct shaking.

[0063] It includes a detection unit (not shown) for detecting shaking of the camera module (1520), and the detection unit can detect rotation and position changes applied to the camera module (1520). The detection unit may include at least one of a sensor that detects changes in angular velocity, for example, a gyro sensor, and an acceleration sensor that detects changes in acceleration.

[0064] The camera module (1520) can control the movement of the prism lens by a control signal. Specifically, if shaking occurs in the camera module (1520), information about the shaking, such as the degree of rotation and position change of the sensors, can be detected, and correction for the shaking can be performed.

[0065] Accordingly, the camera module (1520) according to the embodiment can effectively correct shaking caused by rotation and shaking caused by changes in position when photographing a subject located at infinity or macro distance. Therefore, the camera module (1520) can have improved optical characteristics.

[0066]

[0067] The second lens group (LG2) may include a plurality of lenses. The second lens group (LG2) may include two or more lenses. The plurality of lenses included in the second lens group (LG2) may have a set spacing. Specifically, the spacing between the plurality of lenses included in the second lens group (LG2) may remain constant and not change in the operation mode described later. For example, the spacing between the sixth lens (106) and the seventh lens (107) may remain constant and not change according to the operation mode described later.

[0068]

[0069] The third lens group (LG3) may include a plurality of lenses. Specifically, the third lens group (LG3) may include two or more lenses having opposite refractive powers. For example, the third lens group (LG3) may include two lenses.

[0070] Multiple lenses included in the third lens group (LG3) may have set spacing. Specifically, the spacing between multiple lenses included in the third lens group (LG3) may remain constant and not change in the operation mode described later. For example, the spacing between the eighth lens (108) and the ninth lens (109) may remain constant and not change according to the operation mode described later.

[0071]

[0072] That is, the optical system (1000) may include a plurality of lens groups (LG1, LG2, LG3) and an image sensor (300) arranged sequentially from the object side toward the sensor. Additionally, the optical system (1000) may include a plurality of lenses included in the lens groups (LG1, LG2, LG3), for example, a first lens (101), a second lens (102), a third lens (103), a fourth lens (104), a fifth lens (105), a sixth lens (106), a seventh lens (107), an eighth lens (108), and a ninth lens (109).

[0073] The first lens group (LG1) may include a first lens (101), a second lens (102), a third lens (103), a fourth lens (104), and a fifth lens (105). The second lens group (LG2) may include a sixth lens (106) and a seventh lens (107). The third lens group (LG3) may include an eighth lens (108) and a ninth lens (109). The first lenses (101) through the ninth lenses (109) and the image sensor (300) may be arranged sequentially from the object side of the optical system (1000) toward the sensor.

[0074] Each of the plurality of lenses may include an effective region and a non-effective region. The effective region may be a region through which light incident on each of the first lens (101) to the ninth lens (109) passes. That is, the effective region may be a region where the incident light is refracted to realize optical characteristics.

[0075] The non-effective region may be positioned around the perimeter of the effective region. The non-effective region may be an area where light is not incident. In other words, the non-effective region may be an area unrelated to optical properties. Additionally, the non-effective region may be an area fixed to a barrel (not shown) that accommodates the lens.

[0076] Referring to FIG. 11, at least one of the first lens (101) to the ninth lens (109) in the optical system (1000) according to the present embodiment may have a D-cut technique applied. When the D-cut technique is applied, the height of the entire optical system may be reduced by cutting off a portion of the lens effective diameter or rib. Here, the height of the entire optical system may refer to the length in a direction perpendicular to the optical axis, rather than the TTL. The D-cut lens may have a non-circular shape, and the length (A) in the first direction (X-axis direction) and the length (B) in the second direction (Y-axis direction) may be different.

[0077]

[0078] The image sensor (300) can detect light. The image sensor (300) can detect light that has passed through a plurality of lenses, for example, the first lens (101) to the ninth lens (109) in sequence. The image sensor (300) may include a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS), etc.

[0079] The optical system (1000) may further include a filter (400). The filter (400) may be placed between a plurality of lenses and an image sensor (300). The filter (400) may be placed between the image sensor (300) and the third lens group (LG3) that is closest to the image sensor (300) among a plurality of lens groups (LG1, LG2, LG3). For example, the filter (400) may be placed between the image sensor (300) and the last lens of the fifth lens group (LG5) that is closest to the image sensor (300) among the plurality of lenses.

[0080] The filter (400) may include at least one of an optical filter, such as an infrared filter or a cover glass. The filter (400) may pass light of a set wavelength band and filter light of a different wavelength band. If the filter (400) includes an infrared filter, it may block radiant heat emitted from external light from being transmitted to the image sensor (300). Additionally, the filter (400) may transmit visible light and reflect infrared light.

[0081] The optical system (1000) may include an aperture (not shown). The aperture can control the amount of light incident on the optical system (1000).

[0082] An aperture may be positioned between lens groups. An aperture may be positioned between the first lens group (LG1) and the second lens group (LG2). An aperture may be positioned on the sensor side of the fifth lens (105) that is positioned closest to the sensor side in the first lens group (LG1). An aperture may be positioned on the object side of the sixth lens (106) that is positioned closest to the object side in the second lens group (LG2).

[0083] The aperture may be positioned in front of the first lens (101) or between two selected lenses among the first lens (101) to the ninth lens (109). For example, the aperture may be positioned between the fifth lens (105) and the sixth lens (106). Additionally, at least one of the first lens (101) to the ninth lens (109) may function as an aperture. For example, the object side or sensor side of one of the selected lenses among the first lens (101) to the ninth lens (109) may function as an aperture that controls the amount of light.

[0084]

[0085] We will now describe an optical system according to an embodiment of the invention.

[0086] FIG. 1 is a configuration diagram of an optical system according to the present embodiment operating in a first mode, FIG. 2 is a configuration diagram of an optical system according to the present embodiment operating in a second mode, FIG. 3 is a configuration diagram of an optical system according to the present embodiment operating in a third mode, FIG. 4 is a configuration diagram of an optical system according to the present embodiment operating in a fourth mode, FIG. 5 is a configuration diagram of an optical system according to the present embodiment operating in a fifth mode, FIG. 6 is a configuration diagram of an optical system according to the present embodiment operating in a sixth mode, FIG. 7 is a table showing the aspherical coefficients of lenses in an optical system according to the present embodiment, FIG. 8 is a table showing the aspherical coefficients of lenses in an optical system according to the present embodiment, FIG. 9 is a graph showing data on the aberration characteristics of an optical system according to the present embodiment operating in a first mode, FIG. 10 is a graph showing data on the aberration characteristics of an optical system according to the present embodiment operating in a third mode, FIG. 11 is a graph showing data on the aberration characteristics of an optical system according to the present embodiment operating in a fifth mode, and FIG. 12 describes the D-cut lens of the present invention. This is a drawing for.

[0087] Referring to FIGS. 1 to 6, the optical system (1000) includes a lens portion, and the lens portion may include a first lens (101) to a ninth lens (109). The first to ninth lenses (101-109) may be arranged sequentially along the optical axis (OA) of the optical system (1000). Light corresponding to information about an object may pass through the first to ninth lenses (101-109) and a filter (400) and be incident on an image sensor (300).

[0088] The first lens (101) may be positioned closest to the object side. The first lens (101) may be positioned furthest from the sensor side. The first lens (101) may have a positive (+) refractive power at the optical axis (OA). The first lens (101) may include a plastic material or a glass material, and may be, for example, a plastic material.

[0089] With respect to the optical axis (OA), the first surface (S1) on the object side of the first lens (101) may be convex, and the second surface (S2) on the sensor side may be concave. The first lens (101) may have a meniscus shape with the object side being convex. The first lens (101) may have a meniscus shape with the sensor side being concave. The first lens (101) may have an aspherical surface. The aspherical coefficients of the first and second surfaces (S1, S2) may be provided as L1S1 and L1S2 of FIG. 7. At least one or both of the first surface (S1) and the second surface (S2) of the first lens (101) may be provided without a critical point from the optical axis to the end of the effective area.

[0090]

[0091] The second lens (102) may be positioned second from the object side. The second lens (102) may be positioned eighth from the sensor side. The second lens (102) may be positioned between the first lens (101) and the third lens (103). The second lens (102) may include plastic or glass material. For example, the second lens (102) may be provided with glass material. The third surface (S3) on the object side and the fourth surface (S4) on the sensor side of the second lens (102) may be formed as flat surfaces.

[0092] The second lens (102) may be a prism lens. The second lens (102) may be a right-angle prism lens. The second lens (102) may be an optical path control member. The second lens (102) may change the path of light incident from the outside. The second lens (102) may include a mirror and a prism. The second lens (102) may rotate the optical path by 90°. The second lens (102) includes an incident surface (S3) into which light is incident, a reflective surface (RS1) that reflects the incident light, and an exit surface (S4) that emits the reflected light. The reflective surface (RS1) has an inclination angle of 45° and reflects the main ray of the incident light by 90°, thereby serving to reflect the incident light to the second lens (102). The second lens (102) can reflect light incident in the second direction (Y-axis direction) and change the path of the light to the first direction (X-axis direction).

[0093]

[0094] The third lens (103) may be positioned as the third lens from the object side. The third lens (103) may be positioned as the seventh lens from the sensor side. The third lens (103) may be positioned between the second lens (102) and the fourth lens (104). The third lens (103) may have a positive (+) refractive power at the optical axis (OA). The third lens (103) may include plastic or glass material. For example, the third lens (103) may be provided with plastic material.

[0095] With respect to the optical axis, the object-side fifth surface (S5) of the third lens (103) may be convex, and the sensor-side sixth surface (S6) may be convex. The third lens (103) may have a shape in which both sides are convex at the optical axis (OA). The third lens (103) may have an aspherical surface. The aspherical coefficients of the fifth surface (S5) and the sixth surface (S6) may be provided as L3S1 and L3S2 of FIG. 7. At least one or both of the fifth surface (S5) and the sixth surface (S6) of the third lens (103) may be provided without a threshold point from the optical axis to the end of the effective area.

[0096]

[0097] The fourth lens (104) may be positioned as the fourth lens from the object side. The fourth lens (104) may be positioned as the sixth lens from the sensor side. The fourth lens (104) may be positioned between the third lens (103) and the fifth lens (105). The fourth lens (104) may have a negative (-) refractive power. The fourth lens (104) may include plastic or glass materials. For example, the fourth lens (104) may be provided with a plastic material.

[0098] With respect to the optical axis, the object-side 7th surface (S7) of the 4th lens (104) may be concave, and the sensor-side 8th surface (S8) may be concave. The 4th lens (104) may have a shape with both sides concave. The 4th lens (104) may have an aspherical surface. The aspherical coefficients of the 7th surface (S7) and the 8th surface (S8) may be provided as L4S1 and L4S2 of FIG. 7. At least one or both of the 7th surface (S7) and the 8th surface (S8) of the 4th lens (104) may be provided without a threshold point from the optical axis to the end of the effective area.

[0099]

[0100] The fifth lens (105) may be positioned as the fifth lens from the object side. The fifth lens (105) may be positioned as the fifth lens from the sensor side. The fifth lens (105) may be positioned between the fourth lens (104) and the sixth lens (106). The fifth lens (105) may have a positive (+) or negative (-) refractive power at the optical axis (OA). The fifth lens (105) may have a negative (-) refractive power. The fifth lens (105) may include plastic or glass materials. For example, the fifth lens (105) may be provided with a plastic material.

[0101] With respect to the optical axis (OA), the 5th lens (105) may have a concave 9th surface (S9) on the object side and a concave 10th surface (S10) on the sensor side. The 5th lens (105) may have a shape with both sides concave. The 5th lens (105) may have an aspherical surface. The aspherical coefficients of the 9th surface (S9) and the 10th surface (S10) may be provided as L5S1 and L5S2 of FIG. 7.

[0102] The ninth surface (S9) of the fifth lens (105) may have a critical point from the optical axis to the end of the effective area. When the ninth surface (S9) has a critical point, it may be located in the range of 40% to 60% of the effective radius from the optical axis, preferably in the range of 45% to 55%. The critical point of the ninth surface (S9) may be located in the range of 0.5 mm to 2.0 mm from the optical axis, preferably in the range of 1.0 mm to 1.5 mm. The critical point of the ninth surface (S9) is a point where the sign of the slope value with respect to the optical axis and the direction perpendicular to the optical axis changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean a point where the slope value is 0. Additionally, the critical point of the ninth surface (S9) may be a point where the slope value of the tangent passing through the lens surface increases and then decreases, or decreases and then increases. The tenth surface (S10) of the fifth lens (105) can be provided without a threshold point from the optical axis to the end of the effective area.

[0103]

[0104] The aperture (Stop) can be positioned between the sensor-side lens of the first lens group (LG1) and the object-side lens of the second lens group (LG2). The aperture (Stop) can be positioned between the fifth lens (105) and the sixth lens (106). The aperture can reduce TTL within the angle of view range, and the optical system can be miniaturized. Accordingly, a decrease in yield by weight of the optical system can be prevented, and production efficiency can be improved. In addition, the optical system can be miniaturized by reducing TTL within a diagonal angle of view (FOV) of 15 to 35 degrees.

[0105]

[0106] The sixth lens (106) may be positioned as the sixth lens from the object side. The sixth lens (106) may be positioned as the third lens from the sensor side. The sixth lens (106) may be positioned between the fifth lens (105) and the seventh lens (107). The sixth lens (106) may have a positive (+) or negative (-) refractive power at the optical axis (OA). The sixth lens (106) may have a positive (+) refractive power. The sixth lens (106) may include plastic or glass materials. For example, the sixth lens (106) may be provided with a plastic material.

[0107] With respect to the optical axis (OA), the 6th lens (106) may have an object-side 11th surface (S11) that is convex and a sensor-side 12th surface (S12) that is convex. The 6th lens (106) may have a shape with both sides convex. The 6th lens (106) may have an aspherical surface. The aspherical coefficients of the 11th surface (S11) and the 12th surface (S12) may be provided as L6S1 and L6S2 of FIG. 7. At least one or both of the 11th surface (S11) and the 12th surface (S12) of the 6th lens (106) may be provided without a threshold point from the optical axis to the end of the effective area.

[0108]

[0109] The seventh lens (107) may be positioned as the seventh lens from the object side. The seventh lens (107) may be positioned as the third lens from the sensor side. The seventh lens (107) may be positioned between the sixth lens (106) and the eighth lens (108). The seventh lens (107) may have a positive (+) or negative (-) refractive power at the optical axis (OA). The seventh lens (107) may have a negative (-) refractive power. The seventh lens (107) may include plastic or glass materials. For example, the seventh lens (107) may be provided with a plastic material.

[0110] With respect to the optical axis (OA), the 7th lens (107) may have a concave 13th surface (S13) on the object side and a convex 14th surface (S14) on the sensor side. The 7th lens (107) may have a meniscus shape with the object side being concave. The 7th lens (107) may have a meniscus shape with the sensor side being convex. The 7th lens (107) may have an aspherical surface. The aspherical coefficients of the 13th surface (S13) and the 14th surface (S14) may be provided as L7S1 and L7S2 of FIG. 7.

[0111] The 13th surface (S13) of the 7th lens (107) can be provided without a threshold point from the optical axis to the end of the effective area.

[0112] The 14th surface (S14) of the 7th lens (107) may have a critical point from the optical axis to the end of the effective area. When the 14th surface (S14) has a critical point, it may be located in the range of 75% to 90% of the effective radius from the optical axis, preferably in the range of 80% to 85%. The critical point of the 14th surface (S14) may be located in the range of 1.5 mm to 3.0 mm from the optical axis, preferably in the range of 2.0 mm to 2.5 mm. The critical point of the 14th surface (S14) is a point where the sign of the slope value with respect to the optical axis and the direction perpendicular to the optical axis changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean a point where the slope value is 0. Additionally, the critical point of the 14th surface (S14) may be a point where the slope value of the tangent passing through the lens surface increases and then decreases, or decreases and then increases.

[0113]

[0114] The eighth lens (108) may be positioned as the eighth lens from the object side. The eighth lens (108) may be positioned as the second lens from the sensor side. The eighth lens (108) may be positioned between the sixth lens (106) and the ninth lens (109). The eighth lens (108) may have a positive (+) refractive power. The eighth lens (108) may include plastic or glass materials. For example, the eighth lens (108) may be provided with a plastic material.

[0115] With respect to the optical axis (OA), the eighth lens (108) may have a shape in which the object-side 15th surface (S15) is concave and the sensor-side 16th surface (S16) is convex. The eighth lens (108) may have a meniscus shape that is concave toward the object side. The eighth lens (108) may have a meniscus shape that is convex toward the sensor side. The eighth lens (108) may have an aspherical shape. The aspherical coefficients of the 15th surface (S15) and the 16th surface (S16) may be provided as L8S1 and L8S2 of FIG. 7. At least one or both of the 15th surface (S15) and the 16th surface (S16) of the eighth lens (108) may be provided without a threshold point from the optical axis to the end of the effective area.

[0116]

[0117] The ninth lens (109) may be positioned closest to the sensor side. The ninth lens (109) may be positioned furthest from the object side. The ninth lens (109) may have negative (-) refractive power. The ninth lens (109) may include plastic or glass material. For example, the ninth lens (109) may be provided with plastic material.

[0118] With respect to the optical axis (OA), the ninth lens (109) may have a convex shape on the object-side 17th surface (S17) and a concave shape on the sensor-side 18th surface (S18). The ninth lens (109) may have a meniscus shape that is convex toward the object side. The ninth lens (109) may have a meniscus shape that is concave toward the sensor side. At least one or both of the 17th surface (S17) and the 18th surface (S18) may be aspherical. The aspherical coefficients of the 17th surface (S17) and the 18th surface (S18) may be provided as L9S1 and L9S2 of FIG. 7.

[0119] The 17th surface (S17) of the 9th lens (109) may have a critical point from the optical axis to the end of the effective area. When the 17th surface (S17) has a critical point, it may be located in the range of 20% to 35% of the effective radius from the optical axis, preferably in the range of 25% to 30%. The critical point of the 17th surface (S17) may be located in the range of 0.2 mm to 1.5 mm from the optical axis, preferably in the range of 0.5 mm to 1.0 mm. The critical point of the 17th surface (S17) is a point where the sign of the slope value with respect to the optical axis and the direction perpendicular to the optical axis changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean a point where the slope value is 0. Additionally, the critical point of the 17th surface (S17) may be a point where the slope value of the tangent passing through the lens surface increases and then decreases, or decreases and then increases.

[0120] The 18th surface (S18) of the 9th lens (109) may have a critical point from the optical axis to the end of the effective area. When the 18th surface (S18) has a critical point, it may be located in the range of 40% to 55% of the effective radius from the optical axis, preferably in the range of 45% to 50%. The critical point of the 18th surface (S18) may be located in the range of 0.5 mm to 2.0 mm from the optical axis, preferably in the range of 1.0 mm to 1.5 mm. The critical point of the 18th surface (S18) is a point where the sign of the slope value with respect to the optical axis and the direction perpendicular to the optical axis changes from positive (+) to negative (-) or from negative (-) to positive (+), and may mean a point where the slope value is 0. Additionally, the critical point of the 18th surface (S18) may be a point where the slope value of the tangent passing through the lens surface increases and then decreases, or decreases and then increases.

[0121]

[0122] LensSurfaceRadiusThicknessndvdSemiAperture1S111.1802.6001.54055.6005.475S213.1101.800 4.6552S3Infinity6.0001.86023.8004.310S4Infinity0.800 3.0953S520.0001.0001.68019.2002.700S6-23.4900.440 2.6254S7-6.4600.5001.59028.2002.565S838.4200.320 2.5055S9-56.6600.5501.54055.6002.515S1026.560가변(D1) 2.5306S114.4002.3601.54055.6002.700S12-5.6300.300 2.6907S13-6.1302.6601.67020.3002.610S14-16.180가변(D2) 2.5208S15-5.6401.5401.68019.2002.635S16-5.3400.440 2.6809S177.6200.5001.54055.6002.675S183.580 가변(D3) 2.985Filter Infinity Infinity Image Infinity

[0123] Table 1 shows the surface number, radius of curvature, thickness of the center of each lens or distance between lens surfaces, index, nd, Abbe number (Abbe,vd), effective radius (Semi Aperture), and focal length of the lens according to the present embodiment of the present invention. At this time, the unit of the radius of curvature and the thickness or distance may be mm. In Table 1, the thickness of the second lens (102), which is a prism lens, may refer to the thickness on the optical axis (OA). For example, the thickness of the second lens (102) may refer to the sum of the thickness from the object side (S3) to the reflective surface (RS1) on the y-axis and the thickness from the reflective surface (RS1) to the sensor side (S4) on the x-axis. Additionally, the thickness from the object side (S3) to the reflective surface (RS1) along the y-axis of the second lens (102) and the thickness from the reflective surface (RS1) to the sensor side (S4) along the x-axis of the second lens (102) may be the same. According to a variation, the thickness from the object side (S3) to the reflective surface (RS1) along the y-axis of the second lens (102) and the thickness from the reflective surface (RS1) to the sensor side (S4) along the x-axis of the second lens (102) may be different.

[0124]

[0125] Mode 1 Mode 2 Mode 3 Mode 4 Mode 5 Mode 6 D14.6404.6402.6902.6900.9500.950D23.6804.222.2402.71.8002.33D32.8702.336.2705.818.4507.92

[0126] Table 2 relates to the variable spacing between lenses (D1, D2, D3) when operating in any one of the first to sixth modes in the optical system according to the present embodiment of the invention. Here, the first mode refers to the case of photographing an object located at infinity from the wide end. The second mode refers to the case of photographing an object located at macroscopic distance (e.g., within 500mm) from the wide end. The third mode refers to the case of photographing an object located at infinity from the middle end. The fourth mode refers to the case of photographing an object located at macroscopic distance (e.g., within 500mm) from the middle end. The fifth mode refers to the case of photographing an object located at infinity from the telescopic end. The sixth mode refers to the case where an object located at a close distance (e.g., within 500mm) is photographed from the telescopic end. The wide-angle end may be referred to as a wide angle, and the telescopic end may be referred to as a telephoto. In the optical system according to the present embodiment of the invention, the distance between adjacent lens groups may change during the process of changing the magnification to the first mode, the third mode, and the fifth mode. The angle of view may change during the process of changing the magnification to the first mode, the third mode, and the fifth mode. The first lens group (LG1) is fixed, and only the second and third lens groups (LG2, LG3) can move. The first lens group (LG1) may be a fixed group, and the second and third lens groups (LG2, LG3) may be moving groups.

[0127] When operating from the first mode to the third mode, the distance (D1) between the first lens group (LG1) and the second lens group (LG2) is reduced, the distance (D2) between the second lens group (LG2) and the third lens group (LG3) is reduced, and the distance (D3) between the third lens group (LG3) and the image sensor (300) can be increased.

[0128] When operating from the third mode to the fifth mode, the distance (D1) between the first lens group (LG1) and the second lens group (LG2) is reduced, the distance (D2) between the second lens group (LG2) and the third lens group (LG3) is reduced, and the distance (D3) between the third lens group (LG3) and the image sensor (300) can be increased.

[0129] When operating from the first mode to the fifth mode, the distance (D1) between the first lens group (LG1) and the second lens group (LG2) is reduced, the distance (D2) between the second lens group (LG2) and the third lens group (LG3) is reduced, and the distance (D3) between the third lens group (LG3) and the image sensor (300) can be increased.

[0130] The stroke length of the second lens group (LG2) can be 3 mm to 5 mm, and preferably about 3.690 mm. The stroke length of the third lens group (LG3) can be 5 mm to 7 mm, and preferably about 5.580 mm.

[0131] The stroke length of the third lens group (LG3) may be greater than the stroke length of the second lens group (LG2). The second lens group (LG2) and the third lens group (LG3) may have different moving speeds. The moving speed of the third lens group (LG3) may be greater than the moving speed of the second lens group (LG2). In this embodiment, the magnification of the wide-angle end and the telephoto end may satisfy a range of 1.5 to 2 times, and may satisfy a magnification of approximately 1.67 times.

[0132] When operating from the first mode to the second mode, autofocus can be performed from an object located at infinity in the wide angle to an object located at a close distance. When operating from the first mode to the second mode, the distance (D3) between the third lens group (LG3) and the image sensor (300) can be reduced.

[0133] When operating from the third mode to the fourth mode, autofocus can be performed from an object located at infinity in the middle to an object located at a close distance. When operating from the third mode to the fourth mode, the distance (D3) between the third lens group (LG3) and the image sensor (300) can be reduced.

[0134] When operating from the 5th mode to the 6th mode, autofocus can be performed from an object located at infinity to an object located at a close distance in the telescopic end (tele). When operating from the 5th mode to the 6th mode, the distance (D3) between the 3rd lens group (LG3) and the image sensor (300) can be reduced.

[0135]

[0136] EFL(f)_wide11.85BFL_wide2.870EFL(f)_mid15.8BFL_mid6.270EFL(f)_tele19.75BFL_tele8.450EPD_wide4.96SD_wide10.930EPD_mid5.41SD_mid9.480EPD_tele5.9SD_tele9 .050Fno_wide2.4FOV_wide_infinity33.2Fno_mid2.9FOV_wide_macro33.3Fno_tele3.3FOV_mid_infinity25.2f196.5FOV_mid_macro25.1f316.06FOV_tele_infinity20.1f4-9. 35FOV_tele_macro20f5-33.64ET12.220f65.02ET26f7-16.5ET30.61f848.51ET41.22f9- 13.16ET50.65f_LG1-21.39ET61.01f_LG27.11ET73.01f_LG3-16.12ET81.39CA_Max10.13E T91.05CA_Min5.045TD_LG114.01CA_Aver6.052TD_LG25.32LG2_stroke3.69TD_LG32.48LG3_stroke5.58L_CT_max6TTL33.01L_CT_min0.5ImgH7L_CT_aver1.968ΣCT17.71ΣCG12.42

[0137] Table 3 relates to the items of the mathematical formulas described above in the optical system (1000) of the present embodiment, and includes the effective focal length (F) (mm), BFL (Back Focal Length) (mm), EPD (mm), SD (mm), which is the optical axis distance from the aperture (STOP) to the 18th plane (S18), Fno, FOV (degree), the focal lengths (f1-f9) (mm) of the first to ninth lenses (101-109), the edge thickness (ET1-ET9), the focal lengths (f_LG1, f_LG2, f_LG3) (mm) of the first to third lens groups (LG1, LG2, LG3), the stroke length (LG2_stroke) of the second lens group (LG2), and the stroke length (G3_stroke) of the third lens group (LG3). This relates to the total optical axis distances of the optical system (1000), such as TTL (mm), ImgH (mm), maximum effective diameter (CA_Max), minimum effective diameter (CA_Min), average effective diameter (CA_Aver), maximum center thickness (L_CT_max), minimum center thickness (L_CT_min), and average center thickness (L_CT_aver) among the first to ninth lenses (101-109), and the lengths of each lens group (TD_LG1, TD_LG2, TD_LG3) in the optical axis direction.

[0138] The center thickness of the first to ninth lenses (101 to 109) is denoted as CT1 to CT9, the edge thickness of the end of the effective area of ​​each lens is denoted as ET1 to ET9, the center gap between two adjacent lenses is denoted as CG1 to CG8, and the edge gap between the edges of each lens is denoted as EG1 to EG8. BFL (Back focal length) is the optical axis distance from the image sensor (300) to the center of the last lens. TTL is the optical axis distance from the center of the first surface (S1) of the first lens (101) to the top surface of the image sensor (300). The description of the relationship between the second lens (102), which is a prism lens, is partially omitted below.

[0139]

[0140] When comparing the absolute values ​​of the radius of curvature of each lens, the radius of curvature of the ninth surface (S9) of the fifth lens (105) at the optical axis (OA) may be the maximum among the lenses, and the radius of curvature of the eighteenth surface (S18) of the ninth lens (109) may be the minimum among the lenses. The absolute value of the radius of curvature of the first surface (S1) of the first lens (101) may be smaller than the absolute value of the radius of curvature of the second surface (S2). The absolute value of the radius of curvature of the fifth surface (S5) of the third lens (103) may be smaller than the absolute value of the radius of curvature of the sixth surface (S6). The absolute value of the radius of curvature of the seventh surface (S7) of the fourth lens (104) may be smaller than the absolute value of the radius of curvature of the eighth surface (S8). The absolute value of the radius of curvature of the ninth surface (S9) of the fifth lens (105) may be greater than the absolute value of the radius of curvature of the tenth surface (S10). The absolute value of the radius of curvature of the eleventh surface (S11) of the sixth lens (106) may be smaller than the absolute value of the radius of curvature of the twelfth surface (S12). The absolute value of the radius of curvature of the thirteenth surface (S13) of the seventh lens (107) may be smaller than the absolute value of the radius of curvature of the fourteenth surface (S14). The absolute value of the radius of curvature of the fifteenth surface (S15) of the eighth lens (108) may be greater than the absolute value of the radius of curvature of the sixteenth surface (S16). The absolute value of the radius of curvature of the seventeenth surface (S17) of the ninth lens (109) may be greater than the absolute value of the radius of curvature of the eighteenth surface (S18).

[0141] The ratio of the radius of curvature of each lens can satisfy the following conditions.

[0142] Condition 1: 0.5 < |L1R1 / L1R2| < 1

[0143] Condition 2: 0.5 < |L3R1 / L3R2| < 1

[0144] Condition 3: 0.1 < |L4R1 / L4R2| < 0.5

[0145] Condition 4: 2 < |L5R1 / L5R2| < 2.5

[0146] Condition 5: 0.5 < |L6R1 / L6R2| < 1

[0147] Condition 6: 0.1 < |L7R1 / L7R2| < 0.5

[0148] Condition 7: 1 < |L8R1 / L8R2| < 1.5

[0149] Condition 8: 2 < |L9R1 / L9R2| < 2.5

[0150]

[0151] When describing the center thickness of the lenses based on the optical axis, the center thickness (CT5, CT7) of the 5th lens (105) and the 7th lens (107) is the maximum among the lenses, and the center thickness (CT4) of the 4th lens (104) is the minimum among the lenses. The difference between the maximum center thickness and the minimum center thickness among the lenses may be in the range of 2 mm or more and 3 mm or less.

[0152] The center thickness of each lens can satisfy any one of the following conditions.

[0153] Condition 1: CT2, CT7 > CT1 > CT3, CT4, CT5, CT6, CT8, CT9

[0154] Condition 2: CT2 > CT1, CT3, CT4, CT5, CT6, CT7, CT8, CT9

[0155] Condition 3: CT1, CT2, CT6, CT7, CT8 > CT3 > CT4, CT5, CT9

[0156] Condition 4: CT1, CT2, CT3, CT5, CT6, CT7, CT8 > CT4 = CT9

[0157] Condition 5: CT1, CT2, CT3, CT6, CT7, CT8 > CT5 > CT4, CT9

[0158] Condition 6: CT1, CT2, CT7 > CT6 > CT3, CT4, CT5, CT8, CT9

[0159] Condition 7: CT2 > CT7 > CT1, CT3, CT4, CT5, CT6, CT8, CT9

[0160] Condition 8: CT1, CT2, CT6, CT7 > CT8 > CT3, CT4, CT5, CT9

[0161]

[0162] When zooming, the gap (CG1) between the first lens (101) and the second lens (102), the gap (CG2) between the second lens (102) and the third lens (103), the gap (CG3) between the third lens (103) and the fourth lens (104), the gap (CG4) between the fourth lens (104) and the fifth lens (105), the gap (CG6) between the sixth lens (106) and the seventh lens (107), and the gap (CG8) between the eighth lens (108) and the ninth lens (109) do not change, and the gap (CG5) between the fifth lens (105) and the sixth lens (106), and the gap (CG7) between the seventh lens (107) and the eighth lens (108) may change. Among the center spacings between the unchanging lenses, the center spacing (CG1) between the first lens (101) and the second lens (102) may be maximum, and the center spacing (CG6) between the sixth lens (106) and the seventh lens (107) may be minimum. Among the spaced-out lens spacings, the difference between the maximum center spacing and the minimum center spacing may be 1 mm or more, for example, in the range of 1.2 mm to 1.8 mm.

[0163] The center spacing between each lens can satisfy the following conditions.

[0164] Condition 1: CG1 > CG2, CG3, CG4, CG6, CG8

[0165] Condition 2: CG1 > CG2 > CG3, CG4, CG6, CG8

[0166] Condition 3: CG1, CG2 > CG3 = CG8 > CG4, CG6

[0167] Condition 4: CG1, CG2, CG3, CG8 > CG4 > CG6

[0168] Condition 5: CG1, CG2, CG3, CG4, CG8 > CG6

[0169]

[0170] Regarding the effective aperture, the lens having the maximum effective aperture may be the first lens (101). Here, the effective aperture is the average of the effective aperture on the object side and the effective aperture on the sensor side of each lens. The lens surface having the maximum effective aperture may be the first surface (S1) of the first lens (101). The lens having the minimum effective aperture may be the fifth lens (105). The lens surface having the minimum effective aperture may be the eighth surface (S8) of the fourth lens (104).

[0171] The effective diameter of each lens can satisfy any one of the following conditions.

[0172] Condition 1: CA_L1 > CA_L2, CA_L3, CA_L4, CA_L5, CA_L6, CA_L7, CA_L8, CA_L9

[0173] Condition 2: CA_L1 > CA_L2 > CA_L3, CA_L4, CA_L5, CA_L6, CA_L7, CA_L8, CA_L9

[0174] Condition 3: CA_L1, CA_L2, CA_L6, CA_L9 > CA_L3 > CA_L4, CA_L5, CA_L7, CA_L8

[0175] Condition 4: CA_L1, CA_L2, CA_L3, CA_L6, CA_L7, CA_L8, CA_L9 > CA_L4 > CA_L5

[0176] Condition 5: CA_L1, CA_L2, CA_L3, CA_L4, CA_L6, CA_L7, CA_L8, CA_L9 > CA_L5

[0177] Condition 6: CA_L1, CA_L2, CA_L9 > CA_L6 > CA_L3, CA_L4, CA_L5, CA_L7, CA_L8

[0178] Condition 7: CA_L1, CA_L2, CA_L3, CA_L6, CA_L8, CA_L9 > CA_L7 > CA_L4, CA_L5

[0179] Condition 8: CA_L1, CA_L2, CA_L3, CA_L6, CA_L9 > CA_L8 > CA_L4, CA_L5, CA_L7

[0180] Condition 9: CA_L1, CA_L2 > CA_L9 > CA_L3, CA_L4, CA_L5, CA_L6, CA_L7, CA_L8

[0181]

[0182] Regarding the refractive index, the refractive index of the second lens (102) is the maximum among the lenses and may be greater than 1.6, for example, greater than 1.8. The refractive indices of the first lens (101), the fifth lens (105), the sixth lens (106), and the ninth lens (109) are the minimum among the lenses and may be less than 1.6, for example, less than 1.55. The difference between the maximum and minimum refractive indices may be 0.3 or greater.

[0183] The refractive index of each lens can satisfy any one of the following conditions.

[0184] Condition 1: n2, n3, n4, n7, n8 > n1 = n5 = n6 = n9

[0185] Condition 2: n2 > n1, n3, n4, n5, n6, n7, n8, n9

[0186] Condition 3: n2 > n3 = n8 > n1, n4, n5, n6, n7, n9

[0187] Condition 4: n2, n3, n7, n8 > n4 > n1, n5, n6, n9

[0188] Condition 5: n2, n3, n8 > n7 > n1, n4, n5, n6, n9

[0189]

[0190] When comparing the Abbe numbers, the Abbe numbers of the first lens (101), the fifth lens (105), the sixth lens (106), and the ninth lens (109) are the maximum among the lenses and may be 50 or more. The Abbe numbers of the third lens (103) and the eighth lens (108) are the minimum among the lenses and may be 20 or less. The difference between the maximum refractive index and the minimum Abbe number may be 30 or more.

[0191] The Abbe number of each lens can satisfy any one of the following conditions.

[0192] Condition 1: v1 = v5 = v6 = v9 > v2, v3, v4, v7, v8

[0193] Condition 2: v1, v4, v5, v6, v9 > v2 > v3, v7, v8

[0194] Condition 3: v1, v2, v4, v5, v6, v7, v9 > v3 = v8

[0195] Condition 4: v1, v5, v6, v9 > v4 > v2, v3, v7, v8

[0196] Condition 5: v1, v2, v4, v5, v6, v9 > v7 > v3, v8

[0197]

[0198] The focal lengths (F1, F3, F6, F8) of the 1st, 3rd, 6th, and 8th lenses (101, 103, 106, 108) may have a positive (+) sign. The 1st, 3rd, 6th, and 8th lenses (101, 103, 106, 108) may have a positive (+) refractive power. The focal lengths (F4, F5, F7, F9) of the 4th, 5th, 7th, and 9th lenses (104, 105, 107, 109) may have a negative (-) sign. The 4th, 5th, 7th, and 9th lenses (104, 105, 107, 109) may have a negative (-) refractive power.

[0199] When comparing the focal lengths in absolute values, the focal length of the first lens (101) is the maximum among the lenses and may be 80 or more and 100 or less. The focal length of the sixth lens (106) is the minimum among the lenses, and the absolute value of the focal length of the sixth lens (106) may be 5 or more and 8 or less.

[0200] The absolute value of the focal length of each lens can satisfy any one of the following conditions.

[0201] Condition 1: |f1| > |f3|, |f4|, |f5|, |f6|, |f7|, |f8|, |f9|

[0202] Condition 2: |f1|, |f5|, |f7|, |f8| > |f3| > |f4|, |f6|, |f9|

[0203] Condition 3: |f1|, |f3|, |f5|, |f7|, |f8|, |f9| > |f4| > |f6|

[0204] Condition 4: |f1|, |f8| > |f5| > |f3|, |f4|, |f6|, |f7|, |f9|

[0205] Condition 5: |f1|, |f3|, |f4|, |f5|, |f7|, |f8|, |f9| > |f6|

[0206] Condition 6: |f1|, |f5|, |f8| > |f7| > |f3|, |f4|, |f6|, |f9|

[0207] Condition 7: |f1| > |f8| > |f3|, |f4|, |f5|, |f6|, |f7|, |f9|

[0208] Condition 8: |f1|, |f3|, |f5|, |f7|, |f8| > |f9| > |f4|, |f6|

[0209]

[0210] The combined focal length (f_LG1) of the first lens group (LG1) may have a negative (-) sign. The first lens group (LG1) may have a negative (-) combined refractive power. The combined focal length (f_LG2) of the second lens group (LG2) may have a positive (+) sign. The second lens group (LG2) may have a positive (+) combined refractive power. The combined focal length (f_LG3) of the third lens group (LG3) may have a negative (-) sign. The third lens group (LG3) may have a negative (-) combined refractive power.

[0211] When comparing the absolute values ​​of the combined focal lengths of the first to third lens groups (LG1, LG2, LG3), the combined focal length of the first lens group (LG1) may be the largest, and the combined focal length of the second lens group (LG2) may be the smallest. The relationship between the combined focal lengths of the first to third lens groups (LG1, LG2, LG3) may satisfy |f_LG1| > |f_LG3| > |f_LG2|.

[0212]

[0213] The thickness (T1) of the first lens (101) may be minimum at the edge and maximum at the center, and the maximum thickness is in the range of 1 to 1.5 times the minimum thickness. The thickness (T3) of the third lens (103) may be maximum at the center and minimum at the edge, and the maximum thickness is in the range of 1.5 to 2 times the minimum thickness. The thickness (T4) of the fourth lens (104) may be minimum at the center and maximum at the edge, and the maximum thickness is in the range of 2 to 2.5 times the minimum thickness. The thickness (T5) of the fifth lens (105) may be minimum at the center and maximum at the edge, and the maximum thickness is in the range of 1 to 1.5 times the minimum thickness. The thickness (T6) of the sixth lens (106) may be maximum at the center and minimum at the edge, and the maximum thickness is in the range of 2 to 2.5 times the minimum thickness. The thickness (T7) of the 7th lens (107) may be minimum at the center and maximum at the edge, and the maximum thickness is in the range of 1 to 1.5 times the minimum thickness. The thickness (T8) of the 8th lens (108) may be maximum at the center and minimum at the edge, and the maximum thickness is in the range of 1 to 1.5 times the minimum thickness. The thickness (T9) of the 9th lens (109) may be minimum at the center and maximum at the edge, and the maximum thickness is in the range of 2 to 2.5 times the minimum thickness.

[0214]

[0215] The thickness of each lens can satisfy any one of the following conditions.

[0216] Condition 1: 1 < CT1 / ET1 < 1.5, 0.5 < ET1 / CT1 < 1

[0217] Condition 2: 1.5 < CT3 / ET3 < 2, 0.5 < ET3 / CT3 < 1

[0218] Condition 3: 0.1 < CT4 / ET4 < 0.5, 2 < ET4 / CT4 < 2.5

[0219] Condition 4: 0.5 < CT5 / ET5 < 1, 1 < ET5 / CT5 < 1.5

[0220] Condition 5: 2 < CT6 / ET6 < 2.5, 0.1 < ET6 / CT6 < 0.5

[0221] Condition 6: 0.5 < CT7 / ET7 < 1, 1 < ET7 / CT7 < 1.5

[0222] Condition 7: 1 < CT8 / ET8 < 1.5, 0.5 < ET8 / CT8 < 1

[0223] Condition 8: 0.1 < CT9 / ET9 < 0.5, 2 < ET9 / CT9 < 2.5

[0224] Condition 9: 1 < ΣCT / ΣET < 1.5, 0.5 < ΣET / ΣCT < 1

[0225]

[0226] Among the gaps (G1-G8) between the lenses, the gap (G1) between the first and second lenses (101, 102) may have a maximum center and a minimum edge. The gap (G2) between the second and third lenses (102, 103) may have a maximum edge and a minimum center. The gap (G3) between the third and fourth lenses (103, 104) may have a minimum edge and a maximum center. The gap (G4) between the fourth and fifth lenses (104, 105) may have a minimum edge and a maximum center. The fifth gap (G5) between the fifth and sixth lenses (105, 106) may have a minimum center and a maximum edge. The sixth gap (G6) between the sixth and seventh lenses (106, 107) may have a minimum center and a maximum edge. The seventh gap (G7) between the seventh and eighth lenses (107, 108) may have a maximum at the center and a minimum at the edge. The eighth gap (G8) between the eighth and ninth lenses (108, 109) may have a maximum at the center and a minimum at the edge.

[0227]

[0228] FIGS. 8, 9, and 10 are graphs showing aberration characteristics at the wide, mid, and telescopic ends of the optical system according to the present embodiment. The aberration graphs in FIGS. 8, 9, and 10 show longitudinal spherical aberration, astigmatic field curves, and distortion measured from left to right. In FIGS. 8, 9, and 10, the X-axis may represent focal length (mm) and distortion (%), and the Y-axis may represent the height of the image. Additionally, the graph for longitudinal spherical aberration is for light in the wavelength bands of approximately 435 nm, approximately 486 nm, approximately 546 nm, approximately 587 nm, and approximately 656 nm, and the graphs for astigmatic field curves and distortion are for light in the wavelength band of approximately 546 nm. In the aberration diagrams of FIGS. 8, 9, and 10, it can be interpreted that the aberration correction function is better as the curves at the wide, mid, and telescopic ends are closer to the Y-axis. It can be seen that the optical system (1000) according to the present embodiment has measurement values ​​adjacent to the Y-axis in almost all areas. That is, the optical system (1000) according to the present embodiment has improved resolution and can have good optical performance not only at the center of the field of view (FOV) but also at the periphery.

[0229]

[0230] The optical system (1000) according to the present embodiment disclosed above may satisfy at least one or two of the mathematical formulas described below. Accordingly, the optical system (1000) according to the present embodiment may have improved optical characteristics. For example, if the optical system (1000) satisfies at least one mathematical formula, the optical system (1000) can effectively control aberration characteristics such as chromatic aberration and distortion aberration, and may have good optical performance not only at the center of the field of view (FOV) but also at the periphery. In addition, the optical system (1000) may have improved resolution. Furthermore, regarding the meaning of the thickness of the lens at the optical axis (OA) and the spacing of adjacent lenses at the optical axis (OA) described in the mathematical formulas, one may refer to the present embodiment disclosed above.

[0231]

[0232] [Mathematical Formula 1]

[0233] 2 < TD_LG2 / TD_LG3 < 3

[0234] Equation 1 can establish the relationship between the length of the second lens group (LG2) (TD_LG2) and the length of the third lens group (LG3) (TD_LG3) in the direction of the optical axis. Equation 1 is a condition for reducing aberrations and improving optical performance.

[0235] The second lens group (LG2) and the third lens group (LG3) satisfying Equation 1 can appropriately correct astigmatism aberration and coma aberration. In addition, the overall length of the zoom optical system having an appropriate zoom magnification can be reduced. In this embodiment, Equation 1 can preferably satisfy 2 < TD_LG2 / TD_LG3 < 2.5.

[0236]

[0237] [Mathematical Formula 2]

[0238] 10 < EFL(F)_wide < 15

[0239] In Equation 2, EFL(F)_wide is the total focal length of the optical system (1000) at the wide-angle end. Equation 2 is a condition for limiting zoom optical performance. If the upper limit of Equation 2 is exceeded, it is difficult to secure optical performance due to chromatic aberration, and the amount of movement of each lens group increases significantly during zooming, making mechanical miniaturization difficult. If it is below the lower limit of Equation 2, there is a problem that the sensitivity of the entire optical system increases. A zoom optical system satisfying Equation 2 can secure substantially useful optical performance. In this embodiment, Equation 2 can preferably satisfy 11 < EFL(F)_wide < 12.

[0240]

[0241] [Mathematical Formula 3]

[0242] 1 < BFL_wide < 4

[0243] In Equation 3, BFL_wide is the optical axis distance from the image sensor (300) at the wide angle end to the center of the sensor side of the last lens. If Equation 3 is satisfied, installation space for the filter (400) and cover glass can be secured, and the assembly of components and coupling reliability can be improved through the gap between the image sensor (300) and the last lens. In this embodiment, Equation 3 preferably satisfies 2 < BFL_wide < 3. If BFL_wide is less than the range of Equation 3, some light proceeding to the image sensor may not be transmitted to the image sensor, which may cause a decrease in resolution. If BFL_wide exceeds the range of Equation 3, stray light may be introduced, and the aberration characteristics of the optical system may be degraded.

[0244]

[0245] [Mathematical Formula 4]

[0246] 20 < Ave_ABV < 40

[0247] In Equation 4, Ave_ABV is the average of the Abbe numbers of the lenses included in the optical system (1000). If Equation 4 is satisfied, the optical performance can be improved by appropriately setting the factors affecting chromatic aberration. In this embodiment, Equation 4 can preferably satisfy 30 < Ave_ABV < 40.

[0248]

[0249] [Mathematical Formula 5]

[0250] 1.5 < Ave_Ind < 1.7

[0251] In Equation 5, Ave_Ind is the average of the refractive indices of the lenses included in the optical system (1000). If Equation 5 is satisfied, the optical performance can be improved by appropriately setting the factors affecting chromatic aberration. In this embodiment, Equation 4 can preferably satisfy 1.6 < Ave_Ind < 1.65.

[0252]

[0253] [Mathematical Formula 6]

[0254] 0.1 < |f_LG2 / f_LG3| < 1

[0255] Equation 6 can establish the relationship between the focal length (f_LG2) of the second lens group (LG2) and the focal length (f_LG3) of the third lens group (LG3). Equation 6 is a condition for reducing aberrations and improving optical performance. The second lens group (LG2) and the third lens group (LG3) satisfying Equation 6 can appropriately correct astigmatism aberration and coma aberration. In this embodiment, Equation 6 can preferably satisfy 0.1 < |f_LG2 / f_LG3| < 0.5.

[0256]

[0257] [Mathematical Formula 7]

[0258] 10 < |f_LG3| < 20

[0259] In Equation 7, f_LG3 is the focal length of the third lens group (LG3). Equation 7 is a condition for reducing aberrations and improving optical performance. In this embodiment, Equation 7 can preferably satisfy 15 < |f_LG3| < 17.

[0260]

[0261] [Mathematical Formula 8]

[0262] 5 < LG3_stroke < 10

[0263] Equation 8 can set the range of the stroke length (LG3_stroke) of the third lens group (LG3). If the upper limit of Equation 8 is exceeded, the stroke length of the third lens group (LG3) increases during focusing, making it difficult to miniaturize the optical system. If the lower limit of Equation 8 is not met, the focusing performance of the optical system may be degraded. In this embodiment, Equation 8 can preferably satisfy 5 < LG3_stroke < 7.

[0264]

[0265] [Mathematical Formula 9]

[0266] 70 < F1 < 120

[0267] In Equation 9, F1 is the focal length of the first lens (101). When Equation 9 is satisfied, the optical system (1000) can have a set angle of view and an appropriate focal length, and the angle of view can be set large within an appropriate TTL range. In addition, the first lens (101), which is placed on the object side of the second lens (102), which is a prism lens, must have a small refractive power to implement OIS through prism tilt so that the resolution is not degraded. If it is below the lower limit of Equation 9, the effective aperture or TTL of the lenses becomes longer, which may cause a problem where the imaging lens system becomes large. If it exceeds the upper limit of Equation 9, the influence of the first lens (101) in the entire optical system becomes smaller, and it is necessary to increase the refractive power of the lenses, which makes it difficult to correct spherical aberration or distortion aberration. In this embodiment, Equation 9 can preferably satisfy 90 < F1 < 110.

[0268]

[0269] [Mathematical Formula 10]

[0270] 2 < CT1 < 5

[0271] In Equation 10, CT1 is the center thickness of the first lens (101). If Equation 10 is satisfied, the thickness of the first direction (y-axis direction) of the optical system (1000) can be prevented from increasing, and a miniaturized optical system can be realized. In this embodiment, Equation 10 can preferably satisfy 2 < CT1 < 3.

[0272]

[0273] [Mathematical Formula 11]

[0274] 20 < TTL < 50

[0275] In Equation 11, TTL (Total track length) refers to the distance (mm) along the optical axis (OA) from the center of the first surface (S1) of the first lens (101) to the top surface of the image sensor (300). In this embodiment, Equation 11 can preferably satisfy 30 < TTL < 40.

[0276]

[0277] [Mathematical Formula 12]

[0278] 6 < ImgH < 8

[0279] In Equation 12, ImgH represents the maximum diagonal length of the image sensor (300). Equation 12 can set the diagonal size (ImgH) of the image sensor (300) and can provide an optical system having a large mobile image sensor size. In this embodiment, Equation 12 preferably satisfies 6.5 < ImgH < 7.5.

[0280]

[0281] [Mathematical Formula 13]

[0282] 2 < Fno_wide < 3

[0283] Equation 13 can set the range of Fno_wide of the optical system (1000). If Equation 13 is satisfied, an image of suitable brightness can be provided, and a large amount of light can be received by the image sensor. In this embodiment, Equation 13 can preferably satisfy 2 < Fno_wide < 2.5.

[0284]

[0285] [Mathematical Formula 14]

[0286] 20 < FOV_wide_infinity < 40

[0287] In Equation 14, the range of the field of view (FOV_wide_infinity) can be set in a shooting mode where the position of an object at the wide-angle end is infinite. Equation 14 can provide a field of view suitable for a mobile optical system. In this embodiment, Equation 14 preferably satisfies 30 < FOV_wide_infinity < 40.

[0288]

[0289] [Mathematical Formula 15]

[0290] 2 < TTL / CA_max < 5

[0291] In Equation 15, CA_max represents the largest effective diameter (mm) among the object side and sensor side of the plurality of lenses, and TTL (Total track length) represents the distance (mm) along the optical axis (OA) from the vertex of the first surface (S1) of the first lens (101) to the top surface of the image sensor (300). Equation 15 establishes the relationship between the total optical axis length of the optical system and the maximum effective diameter, thereby providing an improved mobile optical system. In this embodiment, Equation 15 preferably satisfies 3 < TTL / CA_max < 3.5.

[0292]

[0293] [Mathematical Formula 16]

[0294] 3 < TTL / ImgH < 6

[0295] In Equation 16, TTL (Total track length) refers to the distance (mm) along the optical axis (OA) from the vertex of the first surface (S1) of the first lens to the top surface of the image sensor (300), and ImgH refers to the maximum diagonal length of the image sensor (300). When Equation 16 is satisfied, the optical system (1000) can have a TTL for application to the mobile image sensor (300), thereby providing improved image quality. If it is below the lower limit of Equation 2, it is necessary to increase the refractive power of the lenses, making it difficult to correct spherical aberration or distortion aberration; if it exceeds the upper limit of Equation 2, the effective aperture or TTL of the lenses becomes longer, which may cause a problem where the imaging lens system becomes larger. In this embodiment, Equation 16 preferably satisfies 4 < TTL / ImgH < 5.

[0296]

[0297] [Mathematical Formula 17]

[0298] 1 < EFL(F)_wide / ImgH < 4

[0299] In Equation 17, EFL(F)_wide is the total effective focal length of the optical system (1000) at the wide angle, and ImgH represents the maximum diagonal length of the image sensor (300). If Equation 17 is satisfied, the mobile image sensor (300) may have improved aberration characteristics in terms of size. In this embodiment, Equation 17 preferably satisfies 1.5 < EFL(F)_wide / ImgH < 2.

[0300]

[0301] [Mathematical Formula 18]

[0302] 0.1 < ΣCT / TTL < 1

[0303] Equation 18 can establish a relationship between the sum of the center thicknesses of the lenses (ΣCT) and the distance (TTL) from the vertex of the first surface (S1) of the first lens to the upper surface of the image sensor (300) along the optical axis (OA). If the upper limit of Equation 18 is exceeded, the number of lenses increases, and the movement of the moving lens group in the optical system may become disadvantageous. If the lower limit of Equation 18 is not met, the focusing performance of the optical system may be degraded. In this embodiment, Equation 18 preferably satisfies 0.3 < ΣCT / TTL < 0.8.

[0304]

[0305] [Mathematical Formula 19]

[0306] 0.1 < ΣCG / TTL < 1

[0307] Equation 19 can establish a relationship between the sum of the gaps between adjacent lenses (ΣCG) and the distance (TTL) from the vertex of the first surface (S1) of the first lens to the upper surface of the image sensor (300) along the optical axis (OA). If the upper limit of Equation 19 is exceeded, the moving distance of the moving lens group in the lens optical system increases, and consequently, the current consumed during the focusing operation may increase. If the lower limit of Equation 19 is not met, the focusing performance of the optical system may be degraded. In this embodiment, Equation 19 preferably satisfies 0.1 < ΣCG / TTL < 0.5.

[0308]

[0309] [Mathematical Formula 20]

[0310] 1 < ΣCT / ΣCG < 5

[0311] Equation 20 can establish a relationship between the sum of the center thicknesses of the lenses (ΣCT) and the sum of the spacing between adjacent lenses (ΣCT). If the upper limit of Equation 20 is exceeded, the number of lenses increases, and the movement of the moving lens group in the optical system may become disadvantageous. If the lower limit of Equation 20 is not met, focusing performance may be degraded. In this embodiment, Equation 20 preferably satisfies 1 < ΣCT / ΣCG < 2.

[0312]

[0313] [Mathematical Formula 21]

[0314] 1 < CA_max / CA_min < 3

[0315] In Equation 21, CA_max represents the maximum effective diameter among the object sides and sensor sides of the lenses, and CA_min represents the minimum effective diameter among the object sides and sensor sides of the lenses. When Equation 21 is satisfied, the optical system can set a size for a slim and compact structure while maintaining optical performance. In this embodiment, Equation 21 preferably satisfies 1.5 < CA_max / CA_min < 2.5.

[0316]

[0317] [Mathematical Formula 22]

[0318] 1 < CA_max / ImgH < 5

[0319] In Equation 22, CA_max represents the maximum effective diameter among the object sides and sensor sides of the lenses, and ImgH represents the maximum diagonal length of the image sensor (300). When Equation 22 is satisfied, the optical system can maintain good optical performance and set a size for a slim and compact structure. In this embodiment, Equation 22 preferably satisfies 1 < CA_max / ImgH < 2.

[0320]

[0321] [Mathematical Formula 23]

[0322] 0.1 < CA_min / ImgH < 1

[0323] In Equation 23, CA_min represents the minimum effective diameter among the object sides and sensor sides of the lenses, and ImgH represents the maximum diagonal length of the image sensor (300). When Equation 23 is satisfied, the optical system can maintain good optical performance and set a size for a slim and compact structure. In this embodiment, Equation 23 can preferably satisfy 0.5 < CA_min / ImgH < 1.

[0324]

[0325] [Mathematical Formula 24]

[0326] 0.5 < |L1R1| / |L1R2| < 1.1

[0327] In Equation 24, L1R1 is the radius of curvature of the object side of the first lens (101), and L1R2 is the radius of curvature of the sensor side of the first lens (101). Equation 24 is a condition for OIS correction by tilting the prism lens. If the value is less than the lower limit of Equation 24, there is a problem of significant reduction in resolution when correcting OIS through prism lens tilting, and if the value exceeds the upper limit, there is a problem of Fno becoming larger. In this embodiment, Equation 24 can preferably satisfy 0.8 < |L1R1| / |L1R2| < 1.

[0328] Specifically, it is preferable that the radius of curvature of the object side of the first lens (101) is larger than the radius of curvature of the sensor side of the first lens (101). If this is satisfied, a low Fno can be achieved to provide an image of suitable brightness, and a large amount of light can be received by the image sensor.

[0329]

[0330] [Mathematical Formula 25]

[0331] 0.7 < |L6R1| / |L6R2| < 1.2

[0332] In Equation 25, L6R1 is the radius of curvature of the object side of the sixth lens (106), and L6R2 is the radius of curvature of the sensor side of the sixth lens (106). Equation 25 is a condition for optimizing the shape and performance of the sixth lens (106) positioned closest to the object of the second lens group (LG2), which affects the performance of magnification change. If the value is less than the lower limit of Equation 25, the total refractive power of the optical system decreases, resulting in a problem where the aberration control effect is reduced; if the value exceeds the upper limit, the tolerance sensitivity increases, resulting in a problem where manufacturing is difficult. In this embodiment, Equation 25 can preferably satisfy 0.7 < |L6R1| / |L6R2| < 0.8.

[0333]

[0334] [Mathematical Formula 26]

[0335] 1.5 < n6 < 1.6

[0336] In Equation 26, n6 is the refractive index of the sixth lens (106) at 587.6 nm in the d-line. If Equation 26 is satisfied, the optical system can maintain good optical performance with improved aberrations and can set a size for a slim and compact structure. In this embodiment, Equation 26 can preferably satisfy 1.53 < n6 < 1.58.

[0337]

[0338] [Mathematical Formula 27]

[0339] 0 < Tilt Center axis offset < 5

[0340] In Equation 27, the Tilt Center axis offset is the tilt offset (on one side) of the optical axis (OA) of the reflection surface (RS1) of the second lens (102), which is a prism lens. If Equation 27 is satisfied, enhanced OIS can be achieved through prism tilt. If it is below the lower limit of Equation 27, the OIS performance is degraded, and if it exceeds the upper limit, a problem of reduced resolution may occur during OIS operation. In this embodiment, Equation 27 can preferably satisfy 2 < Tilt Center axis offset < 3.

[0341]

[0342] [Mathematical Formula 28]

[0343]

[0344] In Equation 28, Z represents Sag, which can mean the distance in the direction of the optical axis from any position on the aspherical surface to the vertex of the aspherical surface. Y represents the distance in the direction perpendicular to the optical axis from any position on the aspherical surface to the optical axis. c can represent the curvature of the lens, and K can represent the conic constant. Additionally, A, B, C, D, E, and F can represent the aspheric constants.

[0345]

[0346] The optical system (1000) according to the present embodiment may satisfy at least one or two of the mathematical formulas 1 to 28. In this case, the optical system (1000) may have improved optical characteristics. Specifically, when the optical system (1000) satisfies at least one or two of the mathematical formulas 1 to 28, the optical system (1000) may have improved resolution and may improve aberration and distortion characteristics. In addition, the optical system (1000) may secure a Back Focal Length (BFL) for applying the image sensor (300), compensate for the degradation of optical characteristics due to temperature changes, and minimize the gap between the last lens and the image sensor (300), thereby having good optical performance in the center and periphery of the field of view (FOV).

[0347]

[0348] 수학식본 실시예12 < TD_LG2 / TD_LG3 < 32.145210 < EFL(F)_wide < 1511.85031 < BFL_wide < 42.870420 < Ave_ABV < 4037.01151.5 < Ave_Ind < 1.71.62760.1 < |f_LG2 / f_LG3| < 10.441710 < |f_LG3| < 2016.1285 < LG3_stroke < 105.58970 < F1 < 12096.5102 < CT1 < 52.61120 < TTL < 5033.01126 < ImgH < 87132 < Fno_wide < 32.41420 < FOV_wide_infinity < 4033.2152 < TTL / CA_max < 53.259163 < TTL / ImgH < 64.716171 < EFL(F)_wide / ImgH < 41.693180.1 < ΣCT / TTL < 10.537190.1 < ΣCG / TTL < 10.376201 < ΣCT / ΣCG < 51.426211 < CA_max / CA_min < 32.008221 < CA_max / ImgH < 51.447230.1 < CA_min / ImgH < 10.721240.5 < |L1R1| / |L1R2| < 1.10.853250.7 < |L6R1| / |L6R2| < 1.20.782261.5 < n6 < 1.61.540270 < Tilt Center axis offset < 52.5

[0349] FIG. 12 is an example of a portable terminal having an optical system according to the present embodiment. As illustrated in FIG. 12, the portable terminal (1500) may include a camera module (1520), a flash module (1530), and an autofocus device (1510) provided on one side or the rear side. Here, the autofocus device (1510) may include a surface-emitting laser element and a light receiver disclosed above as a light-emitting layer. The flash module (1530) may include an emitter that emits light inside. The flash module (1530) may be operated by the camera operation of the mobile terminal or by control by a user. The camera module (1520) may include an image capturing function and an autofocus function. For example, the camera module (1520) may include an autofocus function using an image.

[0350] The autofocus device (1510) may include an autofocus function using a laser. The autofocus device (1510) may be primarily used under conditions where the autofocus function using the image of the camera module (1520) is degraded. Additionally, although not shown in the drawing, at least one additional camera module may be disposed on the front of the mobile terminal (1500). At least one of the camera modules within the mobile terminal may have the tele-type folded optical system disclosed above.

[0351] An optical system or camera module according to an embodiment of the invention, and a lens assembly according to various embodiments, may be applied to an electronic device employing an image sensor, for example. A lens assembly according to an exemplary embodiment may be applied to various electronic devices such as digital cameras, interchangeable lens cameras, video cameras, mobile phone cameras, cameras for small mobile devices, VR, AR, drones, or manned / unmanned aircraft.

[0352] The features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, etc. exemplified in each embodiment may be combined or modified and implemented in other embodiments by a person skilled in the art to which the embodiments belong. Therefore, details regarding such combinations and modifications should be interpreted as being included within the scope of the present invention.

[0353] Furthermore, although the invention has been described above with reference to embodiments, this is merely illustrative and does not limit the invention. Those skilled in the art will understand that various modifications and applications not exemplified above are possible within the scope of the essential characteristics of the embodiments. For example, each component specifically shown in the embodiments may be modified and implemented. Differences related to such modifications and applications should be interpreted as being included within the scope of the invention as defined in the appended claims.

Claims

1. Includes first to third lens groups arranged along the optical axis, and The above first lens group has a negative (-) refractive power, and The above second lens group has a positive (+) refractive power, and The above third lens group has negative (-) refractive power, and The above first lens group includes a prism lens, and The above first lens group is a fixed group, and The above second lens group and the above third lens group are moving groups in an optical system.

2. In Paragraph 1, An optical system in which the stroke length of the second lens group is smaller than the stroke length of the third lens group.

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

4. In Paragraph 1, The above first lens group includes a first lens having a positive (+) refractive power, a second lens which is a prism lens, a third lens, a fourth lens, and a fifth lens, and The above second lens group includes a sixth lens having a positive (+) refractive power and a seventh lens having a negative (-) refractive power, and The above third lens group is an optical system comprising an eighth lens having positive (+) refractive power and a ninth lens having negative (-) refractive power.

5. In Paragraph 4, The above third lens has a positive (+) refractive power, and The above-mentioned fourth lens has a negative (-) refractive power, and The above-mentioned fifth lens is an optical system having negative (-) refractive power.

6. In Paragraph 4, An optical system in which the radius of curvature on the object side of the first lens is larger than the radius of curvature on the sensor side of the first lens.

7. In Paragraph 1, At the wide angle end, the distance between the first lens group and the second lens group at the optical axis is greater than the distance between the second lens group and the third lens group, and An optical system in which the distance between the first lens group and the second lens group at the optical axis at the telescopic end is smaller than the distance between the second lens group and the third lens group.

8. In Paragraph 1, An optical system satisfying the following condition. <Condition> 2 < TD_LG2 / TD_LG3 < 3 (In the above conditional equation, TD_LG2 is the length of the second lens group in the direction of the optical axis, and TD_LG3 is the length of the third lens group in the direction of the optical axis.) 9. In Paragraph 1, An optical system satisfying the following condition. <Condition> 70 < F1 < 120 (In the above conditional equation, F1 is the focal length of the first lens.) 10. Includes first to ninth lenses arranged along the optical axis, and The above second lens is a prism lens, and The first lens above has a positive (+) refractive power, and The above third lens has a positive (+) refractive power, and The above-mentioned fourth lens has a negative (-) refractive power, and The above fifth lens has a negative (-) refractive power, and The above-mentioned sixth lens has a positive (+) refractive power, and The above seventh lens has a negative (-) refractive power, and The above eighth lens has a positive (+) refractive power, and The above ninth lens is an optical system having negative (-) refractive power.

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